WDU_StreamWrite()

DWORD DLLCALLCONV WDU_StreamWrite	(	_In_ HANDLE	hStream,
		_In_ const PVOID	pBuffer,
		_In_ DWORD	bytes,
		_Outptr_ DWORD *	pdwBytesWritten
	)

Writes data from the application to a write stream.

For a blocking stream (fBlocking=TRUE - see WDU_StreamOpen()), the call to this function is blocked until the entire data (*pBuffer) is written to the stream's data buffer, or until the stream's attempt to write to the device times out (i.e the timeout period for transfers between the stream and the device, as set in the dwRxTxTimeout WDU_StreamOpen() parameter, expires). For a non-blocking stream (fBlocking=FALSE), the function writes as much of the write data as currently possible to the stream's data buffer, and returns immediately. For both blocking and non-blocking transfers, the function returns the amount of bytes that were actually written to the stream within the pdwBytesWritten parameter.

Parameters

[in]	hStream	A unique identifier for the stream, as returned by WDU_StreamOpen().
[in]	pBuffer	Pointer to a data buffer containing the data to write to the stream.
[in]	bytes	Number of bytes to write to the stream.
[out]	pdwBytesWritten	Pointer to a value indicating the number of bytes actually written to the stream.

Returns

WinDriver Error Code

 
DWORD dwStatus;
DWORD dwPipeNum, dwSize, dwBytesTransferred, cmd = MENU_RW_READ_PIPE;
VOID *pBuffer = NULL;
WDU_STREAM_HANDLE stream;
DWORD dwBufferSize = 0x20000;
 
dwStatus = WDU_StreamOpen(hDevice, dwPipeNum, dwBufferSize,
                    dwSize, TRUE, 0, TRANSFER_TIMEOUT, &stream);
if (dwStatus)
{
    ERR("ReadWritePipesMenu: WDU_StreamOpen() failed. "
        "error 0x%lx (\"%s\")\n", dwStatus, Stat2Str(dwStatus));
    goto End_transfer;
}
 
dwStatus = WDU_StreamStart(stream);
if (dwStatus)
{
    ERR("ReadWritePipesMenu: WDU_StreamStart() failed. error "
        "0x%lx (\"%s\")\n", dwStatus, Stat2Str(dwStatus));
    goto End_transfer;
}
 
if (cmd == MENU_RW_READ_PIPE)
{
    dwStatus = WDU_StreamRead(stream, pBuffer, dwSize,
        &dwBytesTransferred);
}
else
{
    dwStatus = WDU_StreamWrite(stream, pBuffer, dwSize,
        &dwBytesTransferred);
}
if (dwStatus)
{
    BOOL fIsRunning;
    DWORD dwLastError;
    DWORD dwBytesInBuffer;
 
    dwStatus = WDU_StreamGetStatus(stream, &fIsRunning,
        &dwLastError, &dwBytesInBuffer);
    if (!dwStatus)
        dwStatus = dwLastError;
}
 
WDU_StreamClose(stream);