This function acquires camera preview images from the selected TWAIN device.
Declaration:
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AT_ERRCOUNT ACCUAPI IG_TWAIN_preview(
LPFNIG_TWAIN_AFTER_PAGE lpfnAfterPage,
LPVOID lpAfterPageData,
AT_BOOL bShowUI
);
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Arguments:
| Name | Type | Description |
| lpfnAfterPage | LPFNIG_TWAIN_AFTER_PAGE | Far pointer to a callback function that will be called after each page is acquired. |
| lpAfterPageData | LPVOID | Optional pointer from which to pass and receive data. Set to NULL if you don't need to do this. |
| bShowUI | AT_BOOL | This flag determines whether or not the user interface is shown. Set to TRUE if you want Data Source to display preview user interface. |
Return Value:
Returns the number of ImageGear errors that occurred during this function call. If there are no errors, the return value is IGE_SUCCESS.
Supported Raster Image Formats:
Depends on the scanner driver.
Remarks:
An example use is to retrieve previews of images stored within a digital camera. The function uses lpfnAfterPage callback function to deliver the acquired images.
Use IG_TWAIN_source_open() to select the desired Data Source, and IG_TWAIN_cap_set() to set desired capabilities values, prior to calling this function.