_VCOMM_WriteComm

include vcomm.inc

VxDCall _VCOMM_WriteComm, <hPort, <OFFSET32 achBuffer> \
    cchRequested, <OFFSET32 cchWritten>>
or      eax, eax
jz      error_handler
 

Writes characters to the transmit queue for the specified communications resource, and returns immediately. Uses the C calling convention. This is an asynchronous service.

• Returns TRUE if successful, FALSE otherwise. For extended error information, use _VCOMM_GetLastError.

hPort

Handle of a communications resource.

achBuffer

Address of an array of characters to write.

cchRequested

Number of characters to write.

cchWritten

Address of a 32-bit variable that receives the number of characters actually written. This can be less than the cchRequested parameter if the transmit queue does not contain enough free bytes, or a communications error has occurred.

See Also

_VCOMM_ClearCommError, _VCOMM_GetLastError