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DTWAIN_SetLoggerCallback |
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The DTWAIN_SetLoggerCallback allows an application to use a callback function that will receive all of the logging strings generated by DTWAIN's DTWAIN_SetTwainLog function.
DTWAIN_BOOL DTWAIN_SetLoggerCallback ( DTWAIN_LOGGER_PROC lProc );
Parameters lpProc A pointer to a function that will be called whenever a DTWAIN log message is generated, or NULL to turn off the callback mechanism.
Return Values TRUE if successful, FALSE otherwise.
Comments DTWAIN_SetLoggerCallback allows an application to use a callback function for log messages generated by the DTWAIN library. Logging is initiated when the DTWAIN_SetTwainLog function is invoked.
Whenever the log message is generated, the user-defined callback function can process the logged message in any way the application sees fit. For example, a logging procedure could send the logged messages to the console, sent over a socket, etc.
The DTWAIN_CALLBACK_PROC is a function pointer with the following prototype:
void CALLBACK DTWAINLoggerProc(LPCTSTR logMsg);
where logMsg is the message that was logged. The CALLBACK is a constant defined by Windows.h to signify that this function will be a callback function (the CALLBACK constant is only important for C or C++ programs).
TWAIN State Transitions None.
Prerequisite Function Call(s)
See Also |