Getting info about partitions - c++

Question

I get an example of c++ code from msdn, where I try to get info about my partitions, but in this code my DeviceIoControl methom returns 0, end error code 3. How can I fix this error?
Code here:
#define WINVER 0x0500
#include <windows.h>
#include <winioctl.h>
#include <iostream>
#include <stdio.h>
void DisplayVolumeInfo(CHAR *volume)
{
HANDLE hDevice = CreateFileA(
volume,
GENERIC_READ | GENERIC_WRITE,
FILE_SHARE_WRITE | FILE_SHARE_READ,
NULL,
OPEN_EXISTING,
FILE_ATTRIBUTE_SYSTEM,
NULL);
if (hDevice != INVALID_HANDLE_VALUE)
{
PARTITION_INFORMATION partInfo;
DWORD retcount = 0;
BOOL res = DeviceIoControl(
hDevice,
IOCTL_DISK_GET_PARTITION_INFO,
(LPVOID)NULL,
(DWORD)0,
(LPVOID)&partInfo,
sizeof(partInfo),
&retcount,
(LPOVERLAPPED)NULL);
if (res)
std::cout << "Volume size = " << partInfo.PartitionLength.QuadPart << " bytes (" << (unsigned long long)(partInfo.PartitionLength.QuadPart / 1024 / 1024) << "Mb)" << std::endl;
else
std::cout << "Can't do IOCTL_DISK_GET_PARTITION_INFO (error code=" << GetLastError() << ")" << std::endl;
DISK_GEOMETRY diskGeometry;
retcount = 0;
res = DeviceIoControl(
hDevice,
IOCTL_DISK_GET_DRIVE_GEOMETRY,
NULL, 0,
&diskGeometry, sizeof(diskGeometry),
&retcount,
(LPOVERLAPPED)NULL);
if (res)
{
std::cout << "Cylinders = " << diskGeometry.Cylinders.QuadPart << std::endl;
std::cout << "Tracks/cylinder = " << diskGeometry.TracksPerCylinder << std::endl;
std::cout << "Sectors/track = " << diskGeometry.SectorsPerTrack << std::endl;
std::cout << "Bytes/sector = " << diskGeometry.BytesPerSector << std::endl;
}
else
std::cout << "Can't do IOCTL_DISK_GET_DRIVE_GEOMETRY (error code=" << GetLastError() << ")" << std::endl;
CloseHandle(hDevice);
}
else
std::cout << "Error opening volume " << volume << " (error code=" << GetLastError() << ")" << std::endl;
}
int main()
{
DWORD CharCount = 0;
char DeviceName[MAX_PATH] = "";
DWORD Error = ERROR_SUCCESS;
HANDLE FindHandle = INVALID_HANDLE_VALUE;
BOOL Found = FALSE;
size_t Index = 0;
BOOL Success = FALSE;
char VolumeName[MAX_PATH] = "";
//
// Enumerate all volumes in the system.
FindHandle = FindFirstVolumeA(VolumeName, MAX_PATH);
if (FindHandle == INVALID_HANDLE_VALUE)
{
Error = GetLastError();
printf("FindFirstVolume failed with error code %d\n", Error);
return 0;
}
for (;;)
{
//
// Skip the \\?\ prefix and remove the trailing backslash.
Index = strlen(VolumeName) - 1;
if (VolumeName[0] != '\\' ||
VolumeName[1] != '\\' ||
VolumeName[2] != '?' ||
VolumeName[3] != '\\' ||
VolumeName[Index] != '\\')
{
Error = ERROR_BAD_PATHNAME;
printf("FindFirstVolume/FindNextVolume returned a bad path: %s\n", VolumeName);
break;
}
//
// QueryDosDeviceW does not allow a trailing backslash,
// so temporarily remove it.
VolumeName[Index] = '\0';
CharCount = QueryDosDeviceA(&VolumeName[4], DeviceName, MAX_PATH);
VolumeName[Index] = '\\';
if ( CharCount == 0 )
{
Error = GetLastError();
printf("QueryDosDevice failed with error code %d\n", Error);
break;
}
printf("\nFound a device:\n %s", DeviceName);
printf("\nVolume name: %s", VolumeName);
printf("\n");
DisplayVolumeInfo(VolumeName);
//
// Move on to the next volume.
Success = FindNextVolumeA(FindHandle, VolumeName, MAX_PATH);
if ( !Success )
{
Error = GetLastError();
if (Error != ERROR_NO_MORE_FILES)
{
printf("FindNextVolumeW failed with error code %d\n", Error);
break;
}
//
// Finished iterating
// through all the volumes.
Error = ERROR_SUCCESS;
break;
}
}
FindVolumeClose(FindHandle);
FindHandle = INVALID_HANDLE_VALUE;
return 0;
}
Has anybody met this problem?
P.S. I work on Windows 7 x32