An application sends a ZIM_GETBITMAP to the ZeeImage control to get a handle to the HBITMAP of the image in a specified slot or index of the control.
wParam = (WPARAM)(int) iSlot; //slot or index of the image control
lParam = 0; //Not used. Set to 0.
This message returns a handle to the HBITMAP of the image contained in the specified slot. It will return NULL if the slot does not contain an image.
//HBITMAP bm now holds a handle to the bitmap of the image in slot 5 of the ZeeImage control.
//HBITMAP bm is now ready to be used by your application by selecting it into a device context.
//with SelectObject(). Don't forget to select it out of the device context when finished with it.
//Do not execute a DeleteObject() on it. The ZeeImage control "owns" the HBITMAP of the image.