ImageGear for C and C++ on Windows v19.5 - Updated
IG_GUI_thumbnail_title_CB_register
API Reference Guide > Core Component API Reference > Core Component Functions Reference > GUI Functions > GUI Thumbnail Functions > IG_GUI_thumbnail_title_CB_register

This function registers a callback of type LPFNIG_GUITHUMBTITLE, which gives you the flexibility to modify the contents of the thumbnail title for the next thumbnail loaded.

Declaration:

 
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AT_ERRCOUNT ACCUAPI IG_GUI_thumbnail_title_CB_register (
        HWND hwndThumbnail, 
        LPFNIG_GUITHUMBTITLE lpfnThumbTitle, 
        LPVOID lpPrivateData
);

Arguments:

Name Type Description
hWndThumbnail HWND Windows handle to the Thumbnail window.
lpfnThumbTitle LPFNIG_GUITHUMBTITLE The name of the callback function you are registering, to be called to modify the thumbnail title.
lpPrivateData LPVOID A far pointer to any private data that you want to pass to the callback.

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:

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.

Sample:

Thumbnail

Example:

See the LPFNIG_GUITHUMBTITLE example.