ASM Community

/* The code of interest is in the subroutine GetDriveGeometry. The
   code in main shows how to interpret the results of the IOCTL call. */
  
#include <windows.h>
#include <winioctl.h>
  
BOOL GetDriveGeometry(DISK_GEOMETRY *pdg)
{
    HANDLE hDevice;               // handle to the drive to be examined
    BOOL bResult;                 // results flag
    DWORD junk;                   // discard results
  
    hDevice = CreateFile("\\\\.\\PhysicalDrive0",  // drive to open
                    0,                // no access to the drive
                    FILE_SHARE_READ | // share mode
                    FILE_SHARE_WRITE,
                    NULL,             // default security attributes
                    OPEN_EXISTING,    // disposition
                    0,                // file attributes
                    NULL);            // do not copy file attributes
  
    if (hDevice == INVALID_HANDLE_VALUE) // cannot open the drive
    {
        return (FALSE);
    }
  
    bResult = DeviceIoControl(hDevice,     // device to be queried
        IOCTL_DISK_GET_DRIVE_GEOMETRY,     // operation to perform
                    NULL, 0,               // no input buffer
                    pdg, sizeof(*pdg),     // output buffer
                    &junk,                 // # bytes returned
                    (LPOVERLAPPED) NULL);  // synchronous I/O
  
    CloseHandle(hDevice);
  
    return (bResult);
}
  
int main(int argc, char *argv[])
{
    DISK_GEOMETRY pdg;            // disk drive geometry structure
    BOOL bResult;                 // generic results flag
    ULONGLONG DiskSize;           // size of the drive, in bytes
  
    bResult = GetDriveGeometry (&pdg);
  
    if (bResult)
    {
        printf("Cylinders = %I64d\n", pdg.Cylinders);
        printf("Tracks per cylinder = %ld\n", (ULONG) pdg.TracksPerCylinder);
        printf("Sectors per track = %ld\n", (ULONG) pdg.SectorsPerTrack);
        printf("Bytes per sector = %ld\n", (ULONG) pdg.BytesPerSector);
  
        DiskSize = pdg.Cylinders.QuadPart * (ULONG)pdg.TracksPerCylinder *
            (ULONG)pdg.SectorsPerTrack * (ULONG)pdg.BytesPerSector;
        printf("Disk size = %I64d (Bytes) = %I64d (Mb)\n", DiskSize,
            DiskSize / (1024 * 1024));
    }
    else
    {
        printf("GetDriveGeometry failed. Error %ld.\n", GetLastError());
    }
  
    return ((int)bResult);
}

WINIOCTL.H<179>:error HI2061:syntax error:identifier 'DWORD'