🚀 go-pugleaf

Andrue Cope [TeamB] wrote:

> // Experimental, didn't work. I'm looking into this now.
>   DWORD blockTotal=GetFileSize( fileHandle, NULL );

Lol. Hmmm. Doesn't seem to be an easy answer to this.

One option would be to check the return error code from SetFilePointer
and if it fails at 360kB, 720kB, 1.2MB or 1.4MB then you've reached the
end. The code we're using is:

      if( DeviceIoControl( MyHandle,
                           IOCTL_DISK_GET_DRIVE_GEOMETRY,
                           NULL,
                           0,
                           &geom,
                           sizeof( geom ),
                           &returned,
                           NULL ) )
      {
        MyBlockSize=WORD( geom.BytesPerSector );
        QWORD tmpQ=0;

        PARTITION_INFORMATION partnInfo;

        if( DeviceIoControl( MyHandle,
                             IOCTL_DISK_GET_PARTITION_INFO,
                             NULL,
                             0,
                             &partnInfo,
                             sizeof( partnInfo ),
                             &returned,
                             NULL ) )
        {
          tmpQ=partnInfo.PartitionLength.QuadPart/MyBlockSize;
        }
        else
        {
          PARTITION_INFORMATION_EX partnInfoEx;

          if( DeviceIoControl( MyHandle,
                               IOCTL_DISK_GET_PARTITION_INFO_EX,
                               NULL,
                               0,
                               &partnInfo,
                               sizeof( partnInfoEx ),
                               &returned,
                               NULL ) )
          {
            tmpQ=partnInfoEx.PartitionLength.QuadPart/MyBlockSize;
          }
          else
            tmpQ=geom.Cylinders.QuadPart*
                 geom.TracksPerCylinder*
                 geom.SectorsPerTrack;
        }

But this is designed to handle any block access device (floppy, hard
disk, card reader, memory stick) so you might not need the whole
shebang. We have just found that some devices respond to one inquiry,
others to another.
-- 
Andrue Cope [TeamB]
[Bicester, Uk]
http://info.borland.com/newsgroups/guide.html