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IOCTL_TOUCH_GET_CALIBRATION_POINTS (Compact 2013)

  • Artículo

3/26/2014

This I/O control message overrides the default calibration points that the touch proxy DLL receives from the touch calibration DLL. Send this message with DeviceIoControl.

Syntax

BOOL DeviceIoControl(
    HANDLE hPddContext,      // handle to the PDD context
    DWORD dwIoControlCode,   // use IOCTL_TOUCH_GET_CALIBRATION_POINTS
    LPVOID lpInBuffer,       // pointer to input buffer
    DWORD nInBufferSize,     // input buffer size
    LPVOID lpOutBuffer,      // pointer to output buffer
    DWORD nOutBufferSize,    // output buffer size
    LPDWORD lpBytesReturned, // number of bytes returned
    OVERLAPPED lpOverlapped  // pointer to OVERLAPPED structure
);

Parameters

  • hPddContext
    [in] Handle to the PDD context returned by TchPdd_Init.
  • dwIoControlCode
    [in] The control code for the operation. Use IOCTL_TOUCH_GET_CALIBRATION_POINTS for this operation.
  • lpInBuffer
    [in] Not used; set to NULL.
  • nInBufferSize
    [in] Not used; set to zero.
  • lpOutBuffer
    [out] Pointer to a buffer of POINT structures.
  • nOutBufferSize
    [in] Size of the value pointed to by lpOutBuffer.
  • lpBytesReturned
    [out] Pointer to a DWORD variable that receives the length of data, in bytes, returned to the lpOutBuffer buffer.
  • lpOverlapped
    [in] Not used; set to NULL.

Return Values

Returns TRUE if successful; otherwise, returns FALSE.

Remarks

To get only a count of the number of calibration points, but not the points themselves, set lpOutBuffer to NULL and nOutBufferSize to zero.

To get extended error information, call GetLastError. GetLastError may return other standard error messages as appropriate.

Requirements

Header

tchstream.h

See Also

Reference

Touch Driver IOCTLs