How to get this work with IOCTL_STORAGE_GET_MEDIA_SERIAL_NUMBER

[EDN Admin]

<p align=left><font face=Arial size=2>I am writing an application which need to get the serial number in USB device. I try to use the API of DeviceIoControl with the  <a id="ctl00_rs1_mainContentContainer_ctl01 http://msdn2.microsoft.com/en-us/library/aa363411(VS.85).aspx <b>IOCTL_STORAGE_GET_MEDIA_SERIAL_NUMBER</b> property. But I can not get it work. I got an error code (50) by calling GetLastError() that means The request is not supported. </font>
<p align=left> 
<p align=left>------- code in below----
<p align=left>#include <windows.h>
#include <WinIoCtl.h>
#include <stdio.h>
<p align=left> 
<p align=left>BOOL GetUsbInfo(MEDIA_SERIAL_NUMBER_DATA *pmty)
{
  HANDLE hDevice;               // handle to the drive to be examined
  BOOL bResult;                 // results flag
  DWORD junk;                   // discard results
<p align=left>  hDevice = CreateFile(TEXT("<a>\\.\F :"),  // drive
                    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
<p align=left>  if (hDevice == INVALID_HANDLE_VALUE) // cannot open the drive
  {
    return (FALSE);
  }
<p align=left>  bResult = DeviceIoControl(hDevice,  // device to be queried
      IOCTL_STORAGE_GET_MEDIA_SERIAL_NUMBER,  // operation to perform
                             NULL, 0, // no input buffer
                            pmty, sizeof(*pmty),     // output buffer
                            &junk,                 // # bytes returned
                            (LPOVERLAPPED) NULL);  // synchronous I/O
<p align=left>  CloseHandle(hDevice);
<p align=left>  return (bResult);
}
<p align=left>int main(int argc, char *argv[])
{
<p align=left>
  MEDIA_SERIAL_NUMBER_DATA pmty;
  BOOL bResult;                 // generic results flag
<p align=left>
  bResult = GetUsbInfo(&pmty);
  if ( bResult)
  {
   printf("UsbSerialLength = %ldn", pmty.SerialNumberLength);
  }
  else
  {
   printf ("GetDriveType failed. Error %ld.n", GetLastError ());
  }
<p align=left> 
<p align=left>
  return ((int)bResult);
}
<p align=left> 

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