Your application can change the design of the cursor by using the SetCursor function and specifying a different cursor handle. However, when the cursor moves, the system redraws the class cursor at the new location. To prevent the class cursor from being redrawn, you must process the WM_SETCURSOR message. Each time the cursor moves and mouse input is not captured, the system sends this message to the window in which the cursor is moving.
You can specify different cursors for different conditions while processing WM_SETCURSOR. For example, the following example shows how to display the cursor whenever the cursor moves over the icon of a minimized application.
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// If the window is minimized, draw the hCurs3 cursor.
// If the window is not minimized, draw the default
// cursor (class cursor).