Mail Archives: cygwin/2003/04/22/11:58:43
Ok so allow me to correct myself here. The 'Cylinders' element in the
DISK_GEOMETRY structure is a LARGE_INTEGER, which isn't being printed by a
simple printf("%d"). If I print the Cylinders.LowPart element the output is
correct. Since trying to printf a LARGE_INTEGER works on both Visual C and
a version of Watcom I have, is this a bug in Cygwin?
> The following piece of code is trimmed down but shows the basic
> functionality of getting the geometry of a disk. When I build this code
in
> VC I can get correct values for Removeable Media (SmartMedia,
CompactFlash),
> but when I build it under Cygwin the DISK_GEOMETRY structure is only
> partially correct. I understand that this might be a problem for a mingw
> mailing list, but I don't know where such a list might be so I'm starting
> here first. I've only tested this code on Windows XP and Windows .Net
> Server 2003 RC2.
>
> The code outputs:
> VC: 15680 1 1 512
> Cygwin: 15680 0 1 1
>
> "\\\\.\\F:" in this case is an 8M CompactFlash card in a PCMCIA adapter,
in
> a PCI Ricoh CardBus adapter.
>
> #include "windows.h"
> #include "winioctl.h"
>
> int main(void) {
> HANDLE hnd;
> DISK_GEOMETRY geo;
> DWORD rbc=0;
>
> hnd = CreateFile("\\\\.\\f:", GENERIC_READ|GENERIC_WRITE,
> FILE_SHARE_READ|FILE_SHARE_WRITE, NULL, OPEN_EXISTING, 0, NULL);
> if (hnd == INVALID_HANDLE_VALUE) {
> return 1;
> }
>
> memset(&geo, 0, sizeof(DISK_GEOMETRY));
>
> if(!DeviceIoControl(hnd, IOCTL_DISK_GET_DRIVE_GEOMETRY, NULL, 0, &geo,
> sizeof(geo)+20, &rbc, NULL)) {
> return GetLastError();
> }
>
> printf("%d %d %d %d\n", geo.Cylinders, geo.TracksPerCylinder,
> geo.SectorsPerTrack, geo.BytesPerSector);
>
> CloseHandle(hnd);
> return 0;
> }
>
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