References ▼
Called for each enumerated capability of the WIA device and also lets the user abort the enumeration process. The address of this callback is passed as an argument in L_WiaEnumCapabilities function.
#include "ltwia.h"
L_INT pEXT_CALLBACK YourFunction(hSession, nFormatsCount, nTransferMode, pFormat, pUserData)
Handle to an existing WIA session. This handle is obtained by calling the L_WiaInitSession function.
The count of the enumerated WIA device formats.
The transfer mode for the received enumerated format.
Pointer to a GUID structure that contains the received enumerated format.
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_WiaEnumFormats.)
Keep in mind that this is a void pointer, which must be cast to the appropriate data type within your callback function.
| Value | Meaning |
|---|---|
| SUCCESS | The function was successful. |
| ERROR_USER_ABORT | The callback wants to abort the properties set process. |
| < 1 | An error occurred. Refer to Return Codes. |
This feature is available in version 16 or higher.
Call this function to provide the user with information about the available transfer format of the selected WIA device and also to allow the user to abort the enumeration process.
For an example, refer to L_WiaEnumFormats.