'convert' uses undefined class 'std::basic_stringstream'

Question

#include "stdafx.h"

#include <windows.h>

#include <math.h>

#include <cstdlib>

#include <stdlib.h>

#include <stdio.h>

#include <iostream>

#include <string>

#include <string.h>

#include <WINERROR.H>

#include <stddef.h>

#include <stdlib.h>

#include <wchar.h>

#include <tchar.h>

string drive_ID ;

for (int i= 65; i<=90;i++ )

{

      stringstream convert;

      convert << i;    //*error C2079: 'convert' uses undefined class 'std::basic_stringstream<_Elem,_Traits,_Alloc>'

1>        with

1>        [

1>            _Elem=char,

1>            _Traits=std::char_traits<char>,

1>            _Alloc=std::allocator<char>

1>        ]

warning C4552: '<<' : operator has no effect; expected operator with side-effect

*/

      drive_ID = convert.str();  //error C2228: left of '.str' must have class/struct/union 

      drive_ID = i + ":\\"        ;  

      drive_type = GetDriveType(drive_ID);

      if (drive_type != 3) continue;

       filename = drive_ID + ":\\Program Files\\JuniorT\\254.txt" ;

     

      exist = CreateFile(filename, GENERIC_READ, FILE_SHARE_READ, NULL, OPEN_EXISTING, 0, NULL);

              CloseHandle(exist);
 

i  have encount a compile error which want sb to help
how to amend~
thanks

Answer 1

Hello ChiWing,

I think you can avoid that stringstream and generate the drive string like this,

for (int i= 65; i<=90;i++ )
{
    // Generate drive string like this.
    string drive_ID( 1, i );
    drive_ID += string( ":\\");

    ...
}

Regards,
Jijo.

---

http://weseetips.com [^ ] Visual C++ tips and tricks. Updated daily.

Answer 2

To use stringstream you need this:

#include <sstream>

- Wayne

Answer 3

string drive_ID( 1, i );

does it means it is the syntax of changing the i (decimal ASCII) to related english character?

i will use it next , when changing (decimal ASCII) to related english character..