ImageGear for C and C++ on Windows v20.5 - Updated
IG_GUI_pixdump_track_mouse
API Reference Guide > Core Component API Reference > Core Component Functions Reference > GUI Functions > GUI Pixel Dump Functions > IG_GUI_pixdump_track_mouse

This function can be called while processing the Windows mouse-button-down message WM_LBUTTONDOWN for a pixdump window's parent window.

Declaration:

 
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AT_ERRCOUNT ACCUAPI IG_GUI_pixdump_track_mouse( 
        HIGEAR hIGear, 
        DWORD dwGrpID, 
        HWND hWndPixDump, 
        INT nX, 
        INT nY 
);

Arguments:

Name Type Description
hIGear HIGEAR HIGEAR handle of an image.
dwGrpID DWORD Identifier of a group that is used for drawing an image in the parent window.
hWndPixDump HWND Handle of a GUI pixdump window.
nX INT X position of the left mouse button click.
nY INT Y position of the left mouse button click.

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:

All pixel formats supported by ImageGear for C and C++.

Sample:

GUI Windows, Display

Remarks:

See also the IG_GUI_pixdump_window_create() function.

You can obtain the nX, nY coordinates of the mouse click from the parameters passed by Windows with the WM_... message. See the sample application GUI for a demonstration of how to use this and related (IG_GUI_COLOR_PIXDUMP_....()).

You cannot use IG_GUI_..._track_mouse() with a WM_RBUTTONDOWN message. ImageGear only responds to left mouse button clicks.
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