ReadFile() is not reading the SD card data

Question

Hi deall all, Please help me on the the issue of ReadFile(). I have written the program in the vc++ to read the sd card raw data. The code as follows. The program is giving the some junk data. Please help me out by pointing the right mistake. Thanks a lot.

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

#include <windows.h>
#include <stdio.h>
#include <stddef.h>
#include <ntddscsi.h>
#include <winioctl.h>
#include <tchar.h>
#include <strsafe.h>

#define wszDrive L"\\\\.\\D:"
#define BUFFERSIZE 256000

void SendInquiry(HANDLE FileHandle)
{
DWORD  dwBytesRead = 0;
LPVOID   ReadBuffer[BUFFERSIZE];
//int ReadResult;
typedef struct
{
SCSI_PASS_THROUGH Spt;
BYTE Sense[18];
BYTE Data[36];
} INFO;
INFO Info = {0};
DWORD ReturnLen;
Info.Spt.Length = sizeof(Info.Spt);
Info.Spt.SenseInfoLength = sizeof(Info.Sense);
Info.Spt.DataTransferLength = sizeof(Info.Data);
Info.Spt.SenseInfoOffset = offsetof(INFO, Sense);
Info.Spt.DataBufferOffset = offsetof(INFO, Data);
Info.Spt.TimeOutValue = 30;
Info.Spt.DataIn = SCSI_IOCTL_DATA_IN;
Info.Spt.CdbLength = 6;
Info.Spt.Cdb[0] = 0x12; // inquiry opcode
Info.Spt.Cdb[1] = 0x00;
Info.Spt.Cdb[2] = 0x00;
Info.Spt.Cdb[3] = 0x00;
Info.Spt.Cdb[4] = sizeof(Info.Data);
Info.Spt.Cdb[5] = 0x00;
if (DeviceIoControl(FileHandle, IOCTL_SCSI_PASS_THROUGH,&Info, sizeof(Info), &Info, sizeof(Info),&ReturnLen, NULL))
{
puts("success\n");

//ReadResult=ReadFile(FileHandle, ReadBuffer, BUFFERSIZE-1, &dwBytesRead, NULL);

//printf("The File requested is == %d\n",ReadResult);

if(ReadFile(FileHandle, ReadBuffer, BUFFERSIZE-1, &dwBytesRead, NULL))
{
printf("Terminal failure: Unable to read from file.\n");
return;
}
else
{
printf("%s\n", ReadBuffer);
}

}
}
else
printf("ioctl failed. Error=%u\n", GetLastError());
}
int main( void )
{
int a;
LPWSTR FilePathNameOfSDcard=wszDrive;
HANDLE FileHandle;
FileHandle = CreateFile
(
FilePathNameOfSDcard, 
GENERIC_READ | GENERIC_WRITE,
FILE_SHARE_READ | FILE_SHARE_WRITE,
NULL, 
OPEN_EXISTING, 
FILE_ATTRIBUTE_NORMAL,
//FILE_FLAG_OVERLAPPED,
NULL
);
if (FileHandle == INVALID_HANDLE_VALUE)
printf("Could not open device. Error=%d\n", GetLastError());
else
{
SendInquiry(FileHandle);
CloseHandle(FileHandle);
}
printf("\n");
scanf_s("%d",&a);
return(0);
}

Answer 1

Hi,

You can check the file path in SD cards.

The file path should be "Store Card\<folder>\file.txt", do not use driver letter.

Best regards,
Jesse

---

Jesse Jiang [MSFT]
MSDN Community Support | Feedback to us

Answer 2

On Mon, 16 Apr 2012 08:28:15 +0000, Jesse Jiang wrote:

Hi,

You can check the file path in SD cards.

The file path should be "Store Card\<folder>\file.txt", do not use driver letter.

Actually, the root name for a storage card can vary quite a bit. I've encountered
Storage Card
Storage_Card
CF Card
SD Card
Memory Card

And each can have a trailing number it a card is removed and replaced (by same or another
card).

Definitely no drive letters.

Best regards,
Jesse

-----------------------------------------
To reply to me, remove the underscores (_) from my email address (and please indicate which newsgroup and message).

Robert E. Zaret
PenFact, Inc.
20 Park Plaza, Suite 400
Boston, MA 02116
www.penfact.com
r_z_aret@pen_fact.com
Useful reading (be sure to read its disclaimer first):
   http://catb.org/~esr/faqs/smart-questions.html

Answer 3

On Fri, 13 Apr 2012 10:26:35 +0000, wep1 wrote:

Hi deall all, Please help me on the the issue of ReadFile(). I have written the program in the vc++ to read the sd card raw data. The code as follows. The program is giving the some junk data.

ASCII/Unicode may be a problem. If you're reading an ASCII file, you'll need to convert
all it's content to UNICODE for most string functions in CE/Windows Mobile; see the
MultiByteToWideChar and WideCharToMultiByte functions. If you're reading a UNICODE file,
make sure it starts with a BOM (Byte Order Marker).

Please help me out by pointing the right mistake. Thanks a lot.

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

#include <windows.h>
#include <stdio.h>
#include <stddef.h>
#include <ntddscsi.h>
#include <winioctl.h>
#include <tchar.h>
#include <strsafe.h>

#define wszDrive L"\\\\.\\D:"
#define BUFFERSIZE 256000

void SendInquiry(HANDLE FileHandle)
{
DWORD  dwBytesRead = 0;
LPVOID   ReadBuffer[BUFFERSIZE];
/int ReadResult;
typedef struct
{
SCSI_PASS_THROUGH Spt;
BYTE Sense[18];
BYTE Data[36];
} INFO; INFO Info = {0};
DWORD ReturnLen;
Info.Spt.Length = sizeof(Info.Spt);
Info.Spt.SenseInfoLength = sizeof(Info.Sense);
Info.Spt.DataTransferLength = sizeof(Info.Data);
Info.Spt.SenseInfoOffset = offsetof(INFO, Sense);
Info.Spt.DataBufferOffset = offsetof(INFO, Data);
Info.Spt.TimeOutValue = 30;
Info.Spt.DataIn = SCSI_IOCTL_DATA_IN;
Info.Spt.CdbLength = 6;
Info.Spt.Cdb[0] = 0x12; / inquiry opcode
Info.Spt.Cdb[1] = 0x00;
Info.Spt.Cdb[2] = 0x00;
Info.Spt.Cdb[3] = 0x00;
Info.Spt.Cdb[4] = sizeof(Info.Data);
Info.Spt.Cdb[5] = 0x00;
if (DeviceIoControl(FileHandle, IOCTL_SCSI_PASS_THROUGH,&Info, sizeof(Info), &Info, sizeof(Info),&ReturnLen, NULL))
{
puts("success\n");

//ReadResult=ReadFile(FileHandle, ReadBuffer, BUFFERSIZE-1, &dwBytesRead, NULL);

//printf("The File requested is == %d\n",ReadResult);

if(ReadFile(FileHandle, ReadBuffer, BUFFERSIZE-1, &dwBytesRead, NULL))
{
printf("Terminal failure: Unable to read from file.\n");
return;
}
else
{
printf("%s\n", ReadBuffer);
}

}
} else
printf("ioctl failed. Error=%u\n", GetLastError());
}
int main( void )
{
int a;
LPWSTR FilePathNameOfSDcard=wszDrive;
HANDLE FileHandle;
FileHandle = CreateFile
(
FilePathNameOfSDcard, 
GENERIC_READ | GENERIC_WRITE,
FILE_SHARE_READ | FILE_SHARE_WRITE,
NULL, 
OPEN_EXISTING, 
FILE_ATTRIBUTE_NORMAL,
//FILE_FLAG_OVERLAPPED,
NULL
);
if (FileHandle == INVALID_HANDLE_VALUE)
printf("Could not open device. Error=%d\n", GetLastError());
else
{
SendInquiry(FileHandle);
CloseHandle(FileHandle);
}
printf("\n");
scanf_s("%d",&a);
return(0);
}

-----------------------------------------
To reply to me, remove the underscores (_) from my email address (and please indicate which newsgroup and message).

Robert E. Zaret
PenFact, Inc.
20 Park Plaza, Suite 400
Boston, MA 02116
www.penfact.com
r_z_aret@pen_fact.com
Useful reading (be sure to read its disclaimer first):
   http://catb.org/~esr/faqs/smart-questions.html

Answer 4

Since the original post code uses 'D:' for the storage card maybe the question is about Windows desktop development?

---

Luca Calligaris lucaDOTcalligarisATeurotechDOTcom www.eurotech.com Check my blog: http://lcalligaris.wordpress.com