Retrieves the number of bytes in buffer.
BOOL FtVspcGetInQueueBytes( FTVSPCHANDLE hPort, size_t *lpcbInQueue );
hPort
[in] Port handle. Refer to FtVspcAttach.
lpcbInQueue
[out] A pointer to the variable where the number of bytes in buffer is returned.
If the function succeeds, the return value is nonzero. Use FtVspcGetLastError to get the error code (FtVspc_ErrorCode).
| ftvspcErrorFailed | 1 | The operation has not been completed. |
|---|---|---|
| ftvspcErrorInvalidParameter | 2 | Invalid parameter. |