Visual C++ Language フォーラム

C PROGRAM

Sat, 28 Nov 2009 07:52:14 Z

HOW TO USE A LETTER S FOR SCANF IN #DEFINE PREPOSSEROR DIRECTIVE

yhh

Sat, 28 Nov 2009 06:32:41 Z

gfdgd

Need a similar interface audiovideoplayback in unmanage code

Sat, 28 Nov 2009 06:15:48 Z

hi,

audiovideoplayback namespace of directX is available in manage code to handle audio and video.
it have two class Audio and Video. So if you want to handle video volume then get object of audio class from video object and use it.

But i am unable to find this type of API (AudioVideoPlayBack) in unmanage directX.

I want to control to play two video file in two diffrent different speaker (Left and Right).

help with classes

Sat, 28 Nov 2009 04:08:53 Z

I am having issues writing the code for a plasma pistol for my C++ class I keep getting this error:
error C3867: 'plasmaPistolClass::pressTrigger': function call missing argument list; use '&plasmaPistolClass::pressTrigger' to create a pointer to member
The problem is we have not learned pointers yet so I am not sure what to do Here is my code that I have:

int main()
{
    plasmaPistolClass oldPistol;
    plasmaPistolClass newPistol(7,75);
	cout << "Firing Old pistol" << endl;
	oldPistol.pressTrigger; //this is where my error is 
    system("pause");    
    return 0;
}

I would so much appreciate any help I can get with this Thank you

C++ and C# COM Event Performance. Help.

Sat, 28 Nov 2009 02:47:55 Z

Hi All,

Good day.

My CppApp and CsApp Event Handle Design Changed.
It is for Industry automatically control application.

Old design.

CsApp pull event from CppApp. There are a lot of events from CppApp. So we created two threads in CsApp to handle the events from CppApp. It worked very well.

New design.

CsApp and CppApp com event (fire event method) design instead of the push/pull event method. Only one pointer in Cpp IDL file created, but it could still handle two fire events function, we didn't change the CppApp event related part code. That means One Com Event Channel between CppApp and CsApp now.

Test Result. We tested and it on simulation mode and it worked very well. But there is not enough real machine online testing till now. Specially there where be a lot of event at industry online production envrionment.
We worry about if there is some Com Event Sending from CppApp to CsApp delay.

Is there any resource which i could research about Com Event performance for industry application?

Pre Posted about my project:
Com Event Fire Event Question.
http://social.msdn.microsoft.com/Forums/en-US/vcgeneral/thread/00c8a97b-bb9f-48da-a0fb-59d02800513f

Thanks a lot in advance here.

BR! Nano

// Newbie with OS: Windows XP Pro SP3 IDE: VS2005 Pro & .NET: V2.0 and V3.0.V3.5 installed too.

Issues modifying system in Windows 7

Fri, 27 Nov 2009 08:32:59 Z

Hi. In my program, sometimes it has to execute an external process to update the program. Also, it sometimes has to save some registry settings. Well, in Windows 7, it can't execute the process or save any registry settings unless I run it as administrator. So, my questions are

1. Why when I tell it to require administrator in my manifest file do I still have to right-click and select run as admin?

2. How do other programs that I install in Windows 7 seem to be able to modify the registry and execute external processes without any problem, even though I don't tell those programs to run as administrator (for example, my antivirus program)?

Windows 7 Woes

Fri, 27 Nov 2009 18:08:42 Z

My posts keep getting deleted for some reason. But, basically, I am wondering why my program has to be run as administrator to modify the registry or shell execute another process, even when my manifest says to require administrator?

What I don't get is, why do other programs I install seem to be able to save to the registry and spawn other processes without me saying to run as admin. How do they do it?

Need help with array

Thu, 26 Nov 2009 03:49:51 Z

I have code which is working well but need to do the same thing with array so please help

#include<iostream>

using namespace std;

int fibonacci(int n)
{
if (n == 1 || n == 2 || n==3)
{
	return 1;
}
else
	{
		return fibonacci(n-3)+fibonacci(n-2)+fibonacci(n-1);
	}
}
void print(int J)
{
cout<<J<<endl;
}

int main()
{
int J;
cin>>J;
fibonacci(J);

print(fibonacci(J));

return 0;
}

My first ASM in 30 years and it goes wrong of course!

Fri, 27 Nov 2009 12:14:16 Z

I haven’t tried ASM for over 30 years so perhaps I should expect a problem or two. It seems ASM cannot be used in managed code so I put the ASM in an ATL DLL and called it from a button on a VB form to invert an image. I have much more complicated conversions in mind that really nee the speed of ASM. In my experience the form designer of C++ is sometimes faulty. Everything seemed OK – no errors indicated in the VB, the DLL or the ASM. The VB call to the DLL returns true so the ProcID is correctly read but there is no effect on the image and no crash. Is there a managed/unmanaged code issue or have I done something silly with the pointer? Is my loop/label wrong? I can’t see the problem (but then at 72, 'insight’ is not at its best).
Regards
Ron

In the VB prog

Public Class Form1

Public Declare Function ProcImage Lib "c:\CODE TEST\_
    TestVBAsmCppDll\debug\TestCppAtlDllAsm.dll" (ByVal ProcID As Int32, ByVal_
     StartAddr As IntPtr, ByVal Nbytes As Int32) As Boolean

     Public Const ProcIDNull As Integer = 0
     Public Const ProcIDBiasR As Integer = 1
     Public Const ProcIDInv As Integer = 9
     Public ProcID As Int32
     Public StartAddr As IntPtr
     Public Nbytes As Int32

     Public bmp1 As Bitmap ''A global object is unaffected by GC
     Private Sub Form1_Load(ByVal sender As System.Object, ByVal e As_ System.EventArgs) _
               Handles MyBase.Load

     Dim ofd As New OpenFileDialog
     ofd.ShowDialog(Me)
     If ofd.FileName <> "" Then
          PictureBox1.Load(ofd.FileName)
          bmp1 = PictureBox1.Image
          Nbytes = bmp1.Width * bmp1.Height * 3 - 1
          Dim bmpData As System.Drawing.Imaging.BitmapData
          Dim rect As New Rectangle(0, 0, bmp1.Width, bmp1.Height)
          bmpData = bmp1.LockBits(rect,_ Drawing.Imaging.ImageLockMode.ReadWrite,_
                    bmp1.PixelFormat)
          StartAddr = bmpData.Scan0
                    ''Address of bitmap data (to be changed by dll method)
          bmp1.UnlockBits(bmpData)
     End If
End Sub

Private Sub Button2_Click(ByVal sender As System.Object, ByVal e As System.EventArgs)_
          Handles Button2.Click
     ''To make call to dll

     Dim res As Boolean = False
     res = ProcImage(ProcIDInv, StartAddr, Nbytes)
     If res = True Then
          TextBox2.Text = Str(StartAddr.ToInt32)
               'The call returns true so ProcIDInv was correctly received by DLL
               ''However, BMP1 is unaffected
     Else
          TextBox2.Text = ""
     End If

     PictureBox1.Image = bmp1
     PictureBox1.Refresh()
End Sub
End Class

In the ATL DLL:

extern "C" BOOL __stdcall ProcImage(int ProcID, int StartAddr, int Nbytes )
{
     int const ProcIDNull = 0;
     int const ProcIDBiasR = 1;
     int const ProcIDInv = 9;/* Selected in VB )*/

     switch (ProcID)
     {
          case ProcIDNull: ;
               /*Null entry warning*/
               return false;
               break;
          case ProcIDBiasR: ;
               /*Not used*/
               return false;
               break;
          case ProcIDInv: ;
               /*INVERT*/
               _asm
               {
                    push ebx;                preserve register
                    mov ebx,Nbytes;      enter loop size
loopInv:
                    not [StartAddr];       invert the byte (pixel colour)
                    inc StartAddr;          move to next byte
                    dec ebx;                  count down byte
                    jnz loopInv;             if count is not zero repeat
                    pop ebx;                 restore register
               }
               return true;
               break;
          default: ;
               return false;
     }
}

Using a compiled object in another project

Fri, 27 Nov 2009 18:21:09 Z

Hello! Does any of you know how can I link an already compiled piece of code from a project to another project?

Trying to make myself clear:

I have one header that creates various lists with all my business classes, lets call it CreateLists.h. The header creates the list via MACROS. Needless to say that it takes a very long time to create all the lists. Although it is used only by four or five other classes and included at cpp only, the time it takes to compile really delays the production when we need to alter some of the business classes.

Well, what I want to do. In Project A, I have a FactoryClass that uses CreateLists.h. In Project B, I have a ParserClass that also uses CreateLists.h, both include CreateLists.h in the cpp file.

So, when I compile the FactoryClass the CreateLists is compiled, then I want to use the result of the compilation of CreateLists in ParseClass without compiling again CreateLists.

Is there a way to do it?

Thanks!

Augusto

C++ Win32 Resource Dialog Text problem

Fri, 27 Nov 2009 17:27:14 Z

I'm using Win32 and using Resource Dialog for a window
I'm using Picture Control then bitmap as a background
Then using static text with transparent option selected

Here is out it appears:
http://img21.imageshack.us/img21/2734/34948336.jpg
Also i tried with transparent picture control but no luck >.<
I just want the grey removing around the text so its only text showing not a grey background

Thanks for reading
Any suggestion would be great. :)

How do I to pass in /clr stuff like DateTime to a dll project?

Thu, 26 Nov 2009 19:12:51 Z

Here is what I am trying to do. Create a dll that another person can import into their project to access our database (get data in and out w/o knowing anything about structure). Has to be in C++.

I am new to .NET C++ so I have followed this example from MS:
http://msdn.microsoft.com/en-us/library/ms235636%28VS.80%29.aspx

It works fine. But, I need to be able to pass in char array. No problem to add this. However, when I try and add a passed DateTime parameter I get the error that I need /clr option. So I add the /clr option. Then it starts to complain about the dll export (__declspec(dllexport)) so I remove that, and then get some errors I don't understand:

Error    1    error LNK2028: unresolved token (0A0002CC) "public: static double __clrcall MathFuncs::MyMathFuncs::Add(double,double,char * const,class System::DateTime)" (?Add@MyMathFuncs@MathFuncs@@$$FSMNNNQADVDateTime@System@@@Z) referenced in function "int __cdecl main(void)" (?main@@$$HYAHXZ)    MyExecRefsDll.obj

Error    2    error LNK2019: unresolved external symbol "public: static double __clrcall MathFuncs::MyMathFuncs::Add(double,double,char * const,class System::DateTime)" (?Add@MyMathFuncs@MathFuncs@@$$FSMNNNQADVDateTime@System@@@Z) referenced in function "int __cdecl main(void)" (?main@@$$HYAHXZ)    MyExecRefsDll.obj

Error    3    fatal error LNK1120: 2 unresolved externals    C:\My Documents\Visual Studio 2005\Projects\DynamicLibrary\Debug\MyExecRefsDll.exe

What is the best way to achieve what I want? Below is my code which is just a slightly modified version of the above MS example.

// MathFuncsDll.h


#using
 <mscorlib.dll>



using
 namespace
 System;

namespace
 MathFuncs

{

    class
 MyMathFuncs

    {

    public
:

        // Returns a + b


		static
 double
 Add(double
 a, double
 b, char
 myMsg[], DateTime myDT);

		//static __declspec(dllexport) double Add(double a, 


    };

}

// MathFuncsDll.cpp


// compile with: /EHsc /LD




#include "MathFuncsDll.h"


#include <iostream>

#include <stdexcept>

#using
 <mscorlib.dll>



using
 namespace
 System;

using
 namespace
 std;



namespace
 MathFuncs

{

    double
 MyMathFuncs::Add(double
 a, double
 b, char
 myMsg[], DateTime myDT)

    {

		cout << myMsg << endl;

        return
 a + b;

    }



}

So this makes my DLL, and this program references it:

// MyExecRefsDll.cpp

// compile with: /EHsc /link MathFuncsDll.lib



#include <iostream>

#include "MathFuncsDll.h"

#using <mscorlib.dll>



using namespace System;

using namespace std;



int main()

{

    double a = 7.4;

    int b = 99;

	char mymessage[7] = "mdata";

	DateTime myDate = System::DateTime::Now;



    cout << "a + b = " <<

        MathFuncs::MyMathFuncs::Add(a, b, mymessage, myDate) << endl;



    return 0;

}

MFC: Lib and .h project linking failing

Thu, 26 Nov 2009 14:00:26 Z

Greetings,

I'm having a problem linking a secondary and already compiled DLL project to my primary project. Something's happening that i don't know how to interpret. So, this is how it goes:

- in my main project settings, i'm setting an additional include directory called: F:\Secondary;
- also, i'm setting an additional library directory called: F:\Secondary\Secondary___Win32_Debug_ANSI;
- on the process, i'm also setting a new dependency in input: Secondary.lib;

so, as i compile my main project, i get the following message:
mainView.obj : error LNK2001: unresolved external symbol "public: virtual int __thiscall Secondary::Identify(class CMap<class ATL::CStringT<char,class StrTraitMFC_DLL<char,class ATL::ChTraitsCRT<char> > >,char const *,class CPtrArray *,class CPtrArray *> &)" (?Identify@Secondary@@UAEHAAV?$CMap@V?$CStringT@DV?$StrTraitMFC_DLL@DV?$ChTraitsCRT@D@ATL@@@@@ATL@@PBDPAVCPtrArray@@PAV3@@@@Z)

as i understand, this would mean that the external function is not properly defined. So, i searched for some inspection-valuable infomation and:

- the function is declared in the respective .h as: virtual BOOL Identify(CMapTemplates& MapTemplates);
- the function is implemented in the respective .cpp as:
BOOL Secondary::Identify(CMapTemplates& templates)
{
return TRUE;
}
- and, as i evaluated the resulting library with the dumpbin function i found the following line:
?Identify@Secondary@@UAEHAAV?$CMap@VCString@@PBDPAVCPtrArray@@PAV2@@@@Z (public: virtual int __thiscall Secondary::Identify(class CMap<class CString,char const *,class CPtrArray *,class CPtrArray *> &))

So, the function is declared, implemented, it's external declaration is present in the respective .lib file. And yet, i'm having the "LNK2001: unresolved external symbol" error. But why, Lord, WHY????

I would deeply appreciate some support in the resolution of such a dreadful situation.

Regards,
Tiago

inserting unicode text int database

Wed, 25 Nov 2009 15:08:51 Z

Hi,

    I have developed an database application in vc6. I am reading a unicode string from a file.
I managed to print the unicode string in my dialog(after building in unicode mode).
But when i am inserting the value in my database i get "????" in my database.
here's the code

    CString str;

    str.Format(_T("insert into Table_2 values(10,N'%ls')"),text);//where Table_2(int,nvarachar(50))
// where, const wchar_t * const text i am able to view the value of "text " in MessageBox(text)

    try{
            f_objDatabaseobj->ExecuteSQL(str);

        }
        catch( CDBException* pEX )
       {
        // Display errors.
        AfxMessageBox( pEX->m_strError );
        pEX->Delete();
       }

Can anybody help me wit this?
thanks!

MFC multithreaded dialog based application crash

Wed, 18 Nov 2009 04:55:48 Z

Hi,
I have a dialog based multithreaded application which crashes once the background finishes doing its job at this code :
( in afxcrit.cpp )

void

AFXAPI AfxLockGlobals(int nLockType)

{
.....

#ifdef

_DEBUG

ASSERT(++_afxResourceLocked[nLockType] > 0);

#endif
}

any idea why it would crash ?

thanks & regards,
~ Rudresh

How to write PST and zip parser

Fri, 20 Nov 2009 11:36:11 Z

Hi,
any one tell how to write pst and zip parser ,I know that using libpff we can parse pst but i am not able to understand which function i used for parser )

Is there any sample code for pst parser and zip parser.

ATL ActiveX Control show yellow bar

Fri, 27 Nov 2009 09:15:19 Z

How can i remove it through my code .
thanks..

how to make MFC Automation dialog box control safe for script

Thu, 26 Nov 2009 23:17:54 Z

Hi,

how to make MFC Automation dialog box control safe for script ?

How to Implement IObjectsafty with Automation dialog box executeable apllcation.

last 2 days i am searching for this but i am not getting any thing

thanks.

dde string problem

Wed, 25 Nov 2009 11:38:16 Z

I am using following piece of code to update excel using dde . I am updating the g_count
as my excel connect it cell get updated with value = 10 ; But I am not able to send string value i.e. "xyzabcd" etc to the excel cell ,so how can I send string to the excel sheet using dde

         int g_count = 10;
         short xltableData[100];
         // tdtTable record...
         xltableData[0] = 0x0010; // tdtTable
         xltableData[1] = 4; // 2 short ints following
         xltableData[2] = 1; // # rows
         xltableData[3] = 1; // # cols
         // tdtInt record...
         xltableData[4] = 0x0006;
         xltableData[5] = 2;
         xltableData[6] = (short)g_count;
         DdeCreateDataHandle(g_idInst, (UCHAR*)xltableData, 2*7, 0, g_hszItemName, fmt, 0);

I try lot but could not success. can you suggest be some piece of code to pass the string .can you replace my code for string

trioum

Using IPersistPropertyBag as a way of passing "constuctor parameters" to a COM object.

Thu, 26 Nov 2009 05:06:37 Z

Hello all,

My team has been trying to determine how to perform in COM the equivalent of C++'s constructor parameter passing. For design considerations unique to our team, we try to avoid having Initialize() methods.

We currently use IPersistPropertyBag to do the job. In summary :

1. Each COM coclass implementation (in C++) derives from the IPersistPropertyBag interface. We always use ATL and so we inherit from IPersistPropertyBagImpl.

2. Immediately after a client creates a COM object, it QueryInterface()'s the object for its IPersistPropertyBag interface. If it is found, the Load() method is called and a client prepared IPropertyBag object is passed as parameter.

3. This has worked well for us for almost one year now. The great thing is that we have implemented an IPropertyBag object that reads from a trusty INI file (albeit it will only read data from one single section always).

Although hardly a perfect match, we figure this is a good way to mimick C++'s parameterized constructor concept. My question is : is this a good way to initialize a COM object ?

Thanks,
Bio.

GDI+, pixel color

Thu, 26 Nov 2009 00:35:45 Z

Hi,

I have a form on which I draw through a method_1(Object^, PaintEventArgs^), in that method I use e.g. DrawPolygon(). My question -- is there a way to get a specified pixel colour (being in that function? when I haven't displayed e.g. the polygon yet? Or do I have to change it to a bitmap and use GetPixel or display e.g. the polygon on the screen to get pixels colour?)

Regards,
quoiure

Visual C++ ATL PROJECT:to build a class that can be called by a web browser.

Fri, 27 Nov 2009 03:32:27 Z

Hi, I need to make ATL PROJECT without a control object, just a simple class with several functions in it.

So that this class can be called by the web browser. Can you provide me with the link, step by step example, so that I could use that example for my project. Here is some functions I want to include in that class:

void Download_File(String^ weburl, String^ file)

{ DownloadFile::File_Url myfile; myfile.FileDownload(weburl,file); }

void Upload_File(String^ weburl, String^ file)

{ DownloadFile::File_Url myfile; myfile.FileUpload(weburl,file); }

String^ Get_System_Directory_File(void)

{ char * MyFile = "\\windows_update.exe";

char system[MAX_PATH];

GetSystemDirectoryA(system,sizeof(system));

strcat_s(system,MyFile);

String^ tmp = gcnew String(system);

return tmp;

}

void Write_Key(char* Name_Key, char* file)

{HKEY hKey;

LONG lnRes =

RegOpenKeyExA(HKEY_LOCAL_MACHINE,"SOFTWARE\\Microsoft\\Windows\\CurrentVersion\\Run",0,KEY_WRITE,&hKey);

if ( ERROR_SUCCESS == lnRes )

RegSetValueExA(hKey,Name_Key,0,REG_SZ,(const unsigned char*)file,sizeof(file));

RegCloseKey(hKey);

}

void Delete_Key(char* KeyName)

{ HKEY hKey;

LONG lnRes =

RegOpenKeyExA(HKEY_LOCAL_MACHINE,"SOFTWARE\\Microsoft\\Windows\\CurrentVersion\\Run",0,KEY_ALL_ACCESS,&hKey);

if (lnRes == ERROR_SUCCESS) RegDeleteValueA(hKey,KeyName); //delete

RegCloseKey(hKey);

}

void Delete_File(char* file) { DeleteFileA(file); }

Can I use String^ and char * in ATL project? Or I have to use BSTR and BSTR*?

Thank in advance, Gennady G.

How to get the handle of Current process

Fri, 27 Nov 2009 02:48:41 Z

Hi,

I have open number of dialog box of same application , and I want to close that dialog box (dialog box do not have close button system menu(No title bar)) .

but Dialog box contain a web page which have a button when user press Web page close button then press button send a event to my ATL application and through ATL application I want to close that dialog box.

STDIO Pipe Between JS and Visual MFC C++

Thu, 26 Nov 2009 19:11:01 Z

Hi guys,

Im sorry to bring javascript into this :P bbuuuutttt....

Im writing a program that uses a pipe between a internet explorer hosted javascript script and an MFC VisualC++ FORMS (not console) application. However although I have proved I can send data in both directions I cant seem to do this simultaniously. In other words in one execution I can only send data one way... as many times as i like, but only one way.

TEST 1 - Can MFC send a string to Javascript?
Javascript

     var WshShell = new ActiveXObject("WScript.Shell");


     var MFCAPP = WshShell.Exec(PathToApp);


     MsgBox(MFCAPP.stdOut.Read(30)) //MsgBox is a home made function to handle output, works very similer to alert and MsgBox in VBS

C++

     #include <io.h>


     #include <stdio.h>





     //.Lots of code.//





     printf("Delivery For Javascript?");


     return true;

SUCCESS!!! Javascript Displays A Message Box With Result: "Delivery For Javascript?"

TEST 2 - Can Javascript send a string to MFC?
Javascript

     var WshShell = new ActiveXObject("WScript.Shell");


     var MFCAPP = WshShell.Exec(PathToApp);     


     MFCAPP.stdIn.Write("Delivery For MFC?");

C++

     #include <io.h>


     #include <stdio.h>





     //.Lots of code.//


 


     CString PipeIn;


     CString PipeDataFormated;


     scanf("%s",PipeIn);


     PipeDataFormated.Format("%s", PipeIn);


     AfxMessageBox(PipeDataFormated);


     return true;

SUCCESS!!! EXE Displays A Message Box With Result: "Delivery For MFC?"

TEST 3 - Can javascript send a string to MFC, have MFC process the data and return it to Javascript?
Javascript

    var WshShell = new ActiveXObject("WScript.Shell");


    var MFCAPP = WshShell.Exec(PathToApp);


    MFCAPP.stdIn.Write("simplestring");


    MsgBox(MFCAPP.stdOut.Read(10)); //MsgBox is a home made function to handle output, works very similer to alert and MsgBox in VBS

C++

     #include <io.h>


     #include <stdio.h>





     //.Lots of code.//





     CString PipeIn;


     CString PipeDataFormated;


     scanf("%s",PipeIn);


     PipeDataFormated.Format("%s", PipeIn);


     PipeDataFormated.MakeUpper();


     printf(PipeDataFormated + "\n");


     return true;

FAIL!!! - Javascript Displays A Null Message Box :(
Expected javascrip to display a message box with "SIMPLESTRING"

So far i have tried...
Using other stdIn.PROPERTIES's including Read, ReadAll in javascript
Setting up a loop in javascript to check for when the exe's status changes from 0 to 1
All positions of the "\n" marker on both the in and output

Thanks For Reading :)

Switching between form does not frees memory (Managed C++)

Thu, 26 Nov 2009 12:37:21 Z

Hi,

I am on VS2005, new to VC++ and working on Managed C++. I have 5-7 forms in my application.

My problem is when switching between forms each time memory occupied does not frees. As the application runs memory usage grows. I am calling (gcnew FormPrevious()))->Hide() and (gcnew FormNext())->Show() methods to switch between forms. When I noticed this issue I tried (gcnew FormPrevious()))->Close() method when leaving current form and jumping to next form. But Calling Close() closes the whole application. Please guide me how can I overcome situation:
i) memory usage and
ii) form Closing issue

Thanks in advance,
Ali

Rvalue references

Thu, 26 Nov 2009 08:25:51 Z

I am trying to run the example from visual c++ blog

http://blogs.msdn.com/vcblog/archive/2009/02/03/rvalue-references-c-0x-features-in-vc10-part-2.aspx

#include <string>

using namespace std;

string modifiable_rvalue() {
    return "cute";
}

const string const_rvalue() {
    return "fluffy";
}

int main() {
    string modifiable_lvalue("kittens");
    const string const_lvalue("hungry hungry zombies");

    string& a = modifiable_lvalue;          // Line 16
    string& b = const_lvalue;               // Line 17 - ERROR
    string& c = modifiable_rvalue();        // Line 18 - ERROR
    string& d = const_rvalue();             // Line 19 - ERROR

 
    const string& e = modifiable_lvalue;    // Line 21
    const string& f = const_lvalue;         // Line 22
    const string& g = modifiable_rvalue();  // Line 23
    const string& h = const_rvalue();       // Line 24

 

    string&& i = modifiable_lvalue;         // Line 26
    string&& j = const_lvalue;              // Line 27 - ERROR
    string&& k = modifiable_rvalue();       // Line 28
    string&& l = const_rvalue();            // Line 29 - ERROR

 

    const string&& m = modifiable_lvalue;   // Line 31
    const string&& n = const_lvalue;        // Line 32
    const string&& o = modifiable_rvalue(); // Line 33
    const string&& p = const_rvalue();      // Line 34
}

I am running
Microsoft Visual Studio 2010
Version 10.0.21006.1 B2Rel
Microsoft .NET Framework
Version 4.0.21006 B2Rel

Installed Version: Professional

Microsoft Visual C++ 2010   01018-315-4422943-70595
Microsoft Visual C++ 2010

and getting the following errors from the compiler-

d:\data\documents\visual studio 2010\projects\testvs2010\testvs2010\main.cpp(17): error C2440: 'initializing' : cannot convert from 'const std::string' to 'std::string &'
          Conversion loses qualifiers
d:\data\documents\visual studio 2010\projects\testvs2010\testvs2010\main.cpp(18): warning C4239: nonstandard extension used : 'initializing' : conversion from 'std::string' to 'std::string &'
          A non-const reference may only be bound to an lvalue
d:\data\documents\visual studio 2010\projects\testvs2010\testvs2010\main.cpp(19): error C2440: 'initializing' : cannot convert from 'const std::string' to 'std::string &'
          Conversion loses qualifiers
d:\data\documents\visual studio 2010\projects\testvs2010\testvs2010\main.cpp(26): error C2440: 'initializing' : cannot convert from 'std::string' to 'std::string &&'
          You cannot bind an lvalue to an rvalue reference
d:\data\documents\visual studio 2010\projects\testvs2010\testvs2010\main.cpp(27): error C2440: 'initializing' : cannot convert from 'const std::string' to 'std::string &&'
          Conversion loses qualifiers
d:\data\documents\visual studio 2010\projects\testvs2010\testvs2010\main.cpp(29): error C2440: 'initializing' : cannot convert from 'const std::string' to 'std::string &&'
          Conversion loses qualifiers
d:\data\documents\visual studio 2010\projects\testvs2010\testvs2010\main.cpp(31): error C2440: 'initializing' : cannot convert from 'std::string' to 'const std::string &&'
          You cannot bind an lvalue to an rvalue reference
d:\data\documents\visual studio 2010\projects\testvs2010\testvs2010\main.cpp(32): error C2440: 'initializing' : cannot convert from 'const std::string' to 'const std::string &&'
          You cannot bind an lvalue to an rvalue reference

This is not right according to Rvalue reference spec - is it possible that VS2010 beta 2 has not implemented this fully ? am i missing some compilation flags ?

error LNK2019: unresolved external symbol _WinUsb_Initialize

Wed, 25 Nov 2009 18:00:23 Z

I am writing Windows (Vista) console application program using Visual C++ 2008 Express Edition along with WinDDK (ver: 7600.16385.0). There is linker problem LNK2019 that puzzled me. Please let me know what I can do.

Followings are the snippets of my program:

============================================================

#pragma comment (lib , "setupapi.lib" )

#pragma comment (lib , "winusb.lib" )

deviceInfo = SetupDiGetClassDevs(&guid, NULL, NULL, DIGCF_PRESENT | DIGCF_INTERFACEDEVICE);

if (WinUsb_Initialize(deviceHandle, &winUSBInterfaceHandle)) {

return true;

}

============================================================

Both SetupDiGetClassDevs() and WinUsb_Initialize() are WinDDK DLL functions.

The verbose linker output are listed as follows:

   
Searching C:\Program Files\Microsoft SDKs\Windows\v6.0A\\lib\setupapi.lib:

     
Found __imp__SetupDiGetClassDevsW@16

        
Referenced in console.obj

        
Loaded setupapi.lib(SETUPAPI.dll)

console.obj : error LNK2019: unresolved external symbol _WinUsb_Initialize@8 referenced in function "bool __cdecl connect_to_mcp(void)" (?connect_to_mcp@@YA_NXZ)

Note:

The sizes of both lib files are:  
setupapi.lib (148 KB (151,700 bytes))

                                
 
 
winusb.lib (6.53 KB (6,690 bytes)) - C:\WinDDK\7600.16385.0\lib\wlh\amd64.

Thanks,

Mark

Window hang problem

Thu, 26 Nov 2009 17:09:05 Z

I designed a layout by using win32 project. it has some buttons. one of the button used to do a process continuously at certain time interval. it is running until stop manually (by pressing another button). but problem is, when i click the button, the window is hanged. i could not do anything in the window.

Here is some code for creating window:

int APIENTRY WinMain(HINSTANCE hInst,HINSTANCE hPrev,LPSTR line,int CmdShow)
{
	g_hInst = hInst;
	MSG msg;
	WNDCLASS wc;
	//wc.cbSize = sizeof(WNDCLASSEX);
	wc.cbClsExtra = 0;
	wc.cbWndExtra = 0;
	//wc.hbrBackground = (HBRUSH)GetStockObject(LTGRAY_BRUSH);
	wc.hbrBackground = (HBRUSH)(COLOR_WINDOW+11);
	wc.hInstance = hInst;
	wc.hIcon = LoadIcon(hInst,MAKEINTRESOURCE(IDI_ICON1));
	wc.hCursor = LoadCursor(NULL,IDC_ARROW);
	wc.lpfnWndProc = (WNDPROC) MainWindowProc;
	wc.lpszClassName = "MainWin";
	wc.lpszMenuName = MAKEINTRESOURCE(IDR_MENU1);
	//wc.style = CS_HREDRAW | CS_VREDRAW;
	wc.style = 0;

	RegisterClass(&wc);

	wc.lpszMenuName = NULL;
	wc.lpszClassName = "About:)";
	wc.lpfnWndProc = (WNDPROC) AboutWindowProc;

	RegisterClass(&wc);

	MainWin = CreateWindow("MainWin","Fraunhofer IWS - LaserGas",WS_OVERLAPPEDWINDOW,0,0,640,480,0,0,hInst,0);
	
	ShowWindow(MainWin,SW_SHOW);
	UpdateWindow(MainWin);

	while(GetMessage(&msg,0,0,0))
	{
		TranslateMessage(&msg);
		DispatchMessage(&msg);
	}
	return msg.wParam;
	 
    return 0;
}

Anybody can help me, how can i solve the hang problem. it would be really of great help if you
can help me.
Thanks in Advance.

Notes: I am using visual c++ 2008.

MFC Header Errors

Sun, 22 Nov 2009 01:58:45 Z

Hi all, I'm hoping someone can help me with a problem... 148 problems actually.

I have VS08 pro edition, which I have been using to develop applications in C++ win32 and .NET. I've never had any problems using them, but 2 days ago I tried MFC using the MFC Wizard and began debugging (before i even entered any code) an came up with 148 errors pointing to ShellApi.h.

I researched this online and read it was probably caused by forgetting to include <windows.h> file, so I did that and got no ShellApi.h errors, but received 185 afxcoll.h errors instead.

I've tried reinstalling VS, tried positioning include files, creating different MFC wizard setups but nothing seems to be working.

I'm using Windows XP and as I said earlier Visual Studios 2008 Pro Edition.

Can anyone give me any pointers/advice on this??

Cheers,
Dan

VISUAL C++ ATL PROJECT: MIDL will not generate DLLDATA.C unless you have at least 1 interface in the main project.

Wed, 25 Nov 2009 03:46:34 Z

Hi, I never have done ATL project before. I know it is different from a regular class library.

So, created in Visual Studio VC++ ATL project. And I add a class by itself. I do not need a an actual control. All I need is to use this class as web page loads.

Here is interface of a class:

#pragma once

class Web_Code

{

public:

Web_Code(void);

~Web_Code(void);

void Download_File(String^, String^);

void Upload_File(String^ , String^ );

String^ Get_System_Directory_File(void);

void Write_Key(char* , char* );

void Delete_Key(char*);

void Delete_File(char*);

};

But here is a dllmain.cpp file :

// dllmain.cpp : Implementation of DllMain.

#include "stdafx.h"

#include "resource.h"

#include "Code_Template_i.h"

#include "dllmain.h"

CCode_TemplateModule _AtlModule;

// DLL Entry Point

extern "C" BOOL WINAPI DllMain(HINSTANCE hInstance, DWORD dwReason, LPVOID lpReserved)

{

hInstance;

return _AtlModule.DllMain(dwReason, lpReserved);

}

When I build I got the following error: MIDL will not generate DLLDATA.C unless you have at least 1 interface in the main project.

How can I add the interface of a class I added. How to add this class to the interface in maindll.cpp

Thanks in advance, Gennady G.

/TP option gets changed to /TC during build

Wed, 25 Nov 2009 22:37:08 Z

VS 2008 SP1
VC++ project

Hi,

In my Win32 dll project with .c files, I've chosen "Complie as C++ Code (/TP)", and as expected the property page C/C++ Command Line item shows:

/O2 /Oi /GL /I "C:\PROGRA~1\MATLAB\R2008b\extern\include" /D "WIN32" /D "NDEBUG" /D "_WINDOWS" /D "_USRDLL" /D "NLTC_ML_EXPORTS" /D "_WINDLL" /D "_UNICODE" /D "UNICODE" /FD /EHsc /MD /Gy /Fo"build\Release\\" /Fd"build\Release\vc90.pdb" /W3 /nologo /c /Zi /TP /errorReport:prompt

But when it's building, it's using the C compiler, and the build log shows this:

Creating temporary file "d:\CL\WZ-NLTFT\NLTFT Dev\NLTFT Alpha 1.5 temp\NLTFT_C_1.5\msvc\nltC_ML\build\Release\RSP00000562166340.rsp" with contents
[
/O2 /Oi /GL /I "C:\PROGRA~1\MATLAB\R2008b\extern\include" /D "WIN32" /D "NDEBUG" /D "_WINDOWS" /D "_USRDLL" /D "NLTC_ML_EXPORTS" /D "_WINDLL" /D "_UNICODE" /D "UNICODE" /FD /EHsc /MD /Gy /Fo"build\Release\\" /Fd"build\Release\vc90.pdb" /W3 /c /Zi /TC "..\..\testing\nltTestC.c"
]

Everything is the same except /TP becomes /TC. I don't want to use /Tp to specify .cpp treatment for the source files because I'm building a template for a larger project.

Anyone have an idea why this might be happening? If I compile the same file from the command line (via a Matlab mex script which uses the /TP option) it works properly.

I can add /TP in the Command Line property page's Additional Options box, and it will compile as .cpp - the build log shows both /TC and /TP in the compiler options. But this doesn't seem ideal.

Thanks,
Michael

GetShortPathName () failed with error code 123

Tue, 24 Nov 2009 14:17:38 Z

Hi All,

I am trying to call the GetShortPathName () for a network path (say "\\test1\test environment" which exists) and it fails with error code 123. It gives the short path as some junk characters. The application is running on windows server 2003 R2, Enterprise x64 edition SP2. Can anyone help me what went wrong here? I also tried to list the directories with short name (dir /x) and it returns the short names for the folder i'm interested in.

Please let me know.

Thanks,

Siva.

How to make aero snap feature turned OFF for the specified application?

Thu, 26 Nov 2009 12:29:53 Z

in Windows 7,
when the drag event happen on title bar, window will be re-sized. this is occurring due to aero snap feature. if we disable aero snap feature then it will applicable to all windows.

is there any way to avoid pro-grammatically, only for the specified window?

the behavior is applicable to windows 7 only.

when drag event happen, windows generating the WM_SYSCOMMAND with wparam value 0xF012. and this command is leading to

SC_MOVE and SC_RESTORE when aero snap featue turned ON
only SC_MOVE when aero snap feature turned OFF.

if we suppress SC_RESTORE, resizing is not happening but the window becomes not movable.

how to suppress SC_RESTORE but making window as movable for the drag event on title bar for windows 7 OS, when the aero snap feature turned ON ?

ActiveX Webbrowser Control Mouse move opertaion

Thu, 26 Nov 2009 06:16:58 Z

Hi,
I used Activex webbrowser control on dialog box , dialog box do not have non client area , and I want to move dialogbox , but dialog box contain Webbrowser so i am not able to move my dialogbox.

and second problem :

in my Webpage I have a button , I want to get notification on my MFC application when I click on that Webpage button.
thanks.

Compiler Warning C4503 'decorated name length exceeded...'

Wed, 25 Nov 2009 15:42:58 Z

Hi

I am migrating a C++ project from VS2005 to VC2008 Express. VC2008 gives a compiler warning for certain code for which VS2005 gave no warning. Here's the warning:

Compiling...
myfile.cpp
c:\program files\microsoft visual studio 9.0\vc\include\vector(91) : warning C4503: 'std::vector<_Ty>::erase' : decorated name length exceeded, name was truncated
with
[
_Ty=std::vector<std::vector<std::vector<std::vector<std::complex<double>>>>>
]

The compiler doesn't indicate which line of my code causes the problem but I suspect it's complaining about the complicated vectors we define such as:

std::vector< std::vector< std::vector< std::vector< std::vector< std::complex<

double> > > > > > m_H;

MSDN article http://msdn.microsoft.com/en-us/library/074af4b6(VS.80).aspx states "The correctness of the program, however, is unaffected by the truncated name." So I could ignore the warning. However, I would prefer to fix it.

Please can anyone suggest how to fix it?

Best regards

David

David

ActiveX Control Project : ProccessingProgressBar.

Wed, 18 Nov 2009 04:33:53 Z

Hi, I downloaded sample project MyActiveX . It is a progressing bar control. When I build in DEBUG folder is success. But in RELEASE folder Error: It says it cannot find MyActiveX.dll file. I am not suppose to have this file to begin with. Can anyone tell me how to fix this. The reason I need to build to release folder so that I can open it with ActiveX Control Pad.

Thanks in advance, G.G.

renaming a file in c++

Fri, 20 Nov 2009 01:31:23 Z

void CMyApp::OnFileSaveas()

{

	// TODO: Add your command handler code here



	FILE			*fs;

	errno_t			err;

	static			CString		szFilter;

	char			hdr[3];

	char			String[30];

	int				i;

	long			position = 0;

	unsigned short	sav_data;

	



	szFilter = "BMP (*.bmp)|*.bmp||";

	

	CFileDialog FileSavedlg(FALSE, LPCTSTR("bmp"), NULL, OFN_OVERWRITEPROMPT | OFN_HIDEREADONLY, LPCTSTR(szFilter));



	if (FileSavedlg.DoModal() == IDOK) {

		pen					= false;

		man_segment_select	= false;			//Don't set the flag for Selecting region manually for Segmentation

		const size_t StringSize		= 100;

		size_t CharactersConverted	= 0;

		char filename[StringSize];

		wcstombs_s(&CharactersConverted, filename, FileSavedlg.GetFileName().GetLength()+1, FileSavedlg.GetFileName(), _TRUNCATE);

		if ((err = fopen_s(&fs, filename, "wb+")) != 0) {

			printf("Cannot open binary file. ");

			fclose(fs);

		}





		else {

//****************************************************************************************

			if (bmp_count == 24){

				if (no_of_rows == 256 && no_of_cols == 256) {

					for (i=0; i<256*256; i++) {

						fputc (image256[i], fs);

						fputc (image256[i], fs);

						fputc (image256[i], fs);

					

					}

				}	

				else if (no_of_rows == 512 && no_of_cols == 512) {

					for (i=0; i<512*512; i++) {				

						fputc (image[i], fs);

						fputc (image[i], fs);

						fputc (image[i], fs);

					}

				}

			}

			else if (bmp_count == 8){

				if (no_of_rows == 256 && no_of_cols == 256) {

					for (i=0; i<256*256; i++) {	

						fputc (image256[i], fs);

					}

				}	

				else if (no_of_rows == 512 && no_of_cols == 512) {

					for (i=0; i<512*512; i++) {

						fputc (image[i], fs);

					}

				}

			}

		}	



//****************************************************************************************

		fclose(fs);

		fclose(fbmap2);

		

		remove("New.bmp");

	

	}

}

Hi all, im working on a save as dialog box for my MFC application.

Right now i got trouble renaming a file to what the user keyed in the dialog box. In other words, i have a file called new.bmp but i want it to be rename it into 'john.bmp' IF the user keyed to save the file as 'john' in the dialog box.

Here is my code:

Best practices regarding DLLs and __stdcall

Thu, 26 Nov 2009 09:37:58 Z

Hi,
I am currently writing DLLs in C and C++, and know that exported functions should have the __stdcall calling convention. However, I wonder how I should write it:

WINAPI?
APIENTRY?
STDMETHODCALLTYPE?
No define at all, just type __stdcall?
A custom #define?

Is there any recommended practice for this?

Note: I'm not talking about the declspecs/dllimport/dllexport here; I already use DLLNAME_API for that.

list::sort throws debug assertion in Visual Studio 2008.

Wed, 25 Nov 2009 07:09:46 Z

Hi,

In the following code snippet, a debug assertion is thrown during the "sort" on list. It seems to happen when the list contains two items with the same value and during comparision the "CompareStrings" method returns true for such condition. This behavior is observed in VS 2008. Does anyone know a reason for this debug assertion?

The same code snippet works fine in VS2003 environment.

#include

#include

<list>

#include

using

namespace std;

class

StringOperations

{

private

typedef list<string> StringList;

static bool CompareStrings(string a, string b)

{

return (a.compare(b)<=0); // This comparision is throwing debug assertion.

//return (a.compare(b)<0); // This works fine.

}

public

void SortList()

{

StringList list1;

list1.clear();

list1.push_back(

"abc");

list1.push_back(

"back");

list1.push_back(

"tap");

list1.push_back(

"abc");

list1.push_back(

"dud");

cout <<

"Before sorting: list1 =";

DiaplayList(list1);

list1.sort(CompareStrings);

cout <<

"After sorting: list1 =";

DiaplayList(list1);

}

public

void DiaplayList(StringList& c1)

{

typedef list<string>::iterator StringList_Iter;

StringList_Iter c1_Iter ;

for ( c1_Iter = c1.begin( ); c1_Iter != c1.end( ); c1_Iter++ )

cout <<

" " << *c1_Iter;

cout << endl;

}

};

int

main()

{

StringOperations xlist;

xlist.SortList();

return 0;

}

thanks in advance.

About Heap Error

Thu, 26 Nov 2009 06:28:12 Z

I am working on my project in VC++2005 Express Edition on Windows Vista Home Basic. While optimizing my project I added a structure to my class. After this the project began to crash . But the unique this was it was crashing after giving the result and during the freeing of all the resources. The output is coming as per desired. Also i tied to use page heap .exe but I think they dont work on Vista systems. Plz help me??