ImageGear for C and C++ on Windows v19.10 - Updated
IG_GUI_thumbnail_CB_register
Call this function to register a callback function that is to be called whenever a thumbnail is selected in thumbnail window hWndThumbnail.
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AT_ERRCOUNT ACCUAPI IG_GUI_thumbnail_CB_register (
HWND hWndThumbnail,
LPFNIG_GUITHUMBSELECT lpfnThumbSelect,
LPVOID lpPrivate
);
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| Name | Type | Description |
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| hWndThumbnail | HWND | Windows handle to the Thumbnail window. |
| lpfnThumbSelect | LPFNIG_GUITHUMBSELECT | A pointer to the callback function that you are registering, to be called whenever a thumbnail is selected. |
| lpPrivateData | LPVOID | A far pointer to any private data to which you want to pass to the callback. |
Returns the number of ImageGear errors that occurred during this function call.
This function does not process image pixels.
The callback used with this function correctly reports color space and bit depth for these pixel formats only:
Indexed RGB – 1, 4, 8 bpp;
Grayscale – 9…16 bpp;
RGB – 24 bpp;
CMYK – 32 bpp.
Thumbnail, Display, FlashPix
For an example showing the use of this and other IG_GUI_Thumbnail functions and callbacks, see the Thumbnail sample application.
See also the description for callback type LPFNIG_GUITHUMBSELECT.