Available in LEADTOOLS Imaging Pro, Vector, Document, and Medical Imaging toolkits. |
#include "lttwn.h"
L_INT pEXT_CALLBACK YourFunction (hSession, pSourceInfo, pUserData)
HTWAINSESSION hSession; |
/* handle to an existing TWAIN session */ |
pLTWAINSOURCEINFO pSourceInfo; |
/* pointer to the LTWAINSOURCEINFO structure */ |
L_VOID * pUserData; |
/* pointer to additional parameters */ |
Called for each available TWAIN source installed on the system. The address of this callback is passed as an argument in L_TwainGetSources.
Parameter |
Description |
hSession |
Handle to an existing TWAIN session. This handle is obtained by calling the L_TwainInitSession function. |
pSourceInfo |
Pointer to the LTWAINSOURCEINFO structure that contains the name of the TWAIN source retrieved. |
pUserData |
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_TwainGetSources.) |
|
Keep in mind that this is a void pointer, which must be cast to the appropriate data type within your callback function. |
Returns
SUCCESS |
The function was successful. |
! = SUCCESS |
An error occurred. Refer to Return Codes. |
Comments
This callback function gets the available information about the installed TWAIN sources on the system like the names of the TWAIN source, the scanner product family, and the manufacturer.
Required DLLs and Libraries
LTTWN For a listing of the exact DLLs and Libraries needed, based on the toolkit version, refer to Files To Be Included With Your Application. |
See Also
Functions: |
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Topics: |
Example
For an example, refer to L_TwainGetSources.