Called for each configuration test. The address of this callback is passed as an argument to L_TwainFindFastConfig.
L_INT pEXT_CALLBACK YourFunction(hSession, pResConfig, pUserData)
Handle to an existing TWAIN session. This handle is obtained by calling the L_TwainInitSession or L_TwainInitSession2 function.
Pointer to a FASTCONFIG structure that contains the scan configuration that is currently being tested.
A void pointer that you can use to access a variable or structure containing data that your callback function needs. This gives you a way to receive data indirectly from the function that uses this callback function. (This is the same pointer that you pass in the pUserData parameter of L_TwainFindFastConfig.)
Keep in mind that this is a void pointer, which must be cast to the appropriate data type within your callback function.
|SUCCESS||The function was successful.|
|SUCCESS_ABORT||Abort the testing configuration.|
If you return SUCCESS, then the scan configuration testing process will be continued: otherwise, the process will be stopped.
For an example, refer to L_TwainFindFastConfig.
Direct Show .NET | C API | Filters
Media Foundation .NET | C API | Transforms