Edit

Share via

SD Card I/O Requests

  • Article

The IOCTLs in this section allow user-mode applications to operate devices in the Secure Digital (SD) card stack. To use the IOCTLs, the caller must first use CreateFile to get a handle to a device in the SD stack, as shown here, where szDevice points to a NULL-terminated string that references the device.

    hVol = CreateFile (szDevice,
      GENERIC_READ | GENERIC_WRITE,
      FILE_SHARE_WRITE | FILE_SHARE_DELETE,
      NULL,
      OPEN_EXISTING,
      FILE_ATTRIBUTE_NORMAL,
      NULL
      );
      if (hVol == INVALID_HANDLE_VALUE) {
        return GetLastError();
      }

After opening a handle to a volume in the SD stack, the application sends IOCTLs to a device in the SD stack by calling DeviceIoControl. For more information about the Windows SD architecture, see SD Card Driver Stack.

This section describes the following IOCTLs:

IOCTL_SFFDISK_DEVICE_COMMAND

IOCTL_SFFDISK_DEVICE_PASSWORD

IOCTL_SFFDISK_QUERY_DEVICE_PROTOCOL