ussource (USHORT)

Source type.

Identifies the type of control:

CMDSRC_PUSHBUTTON

Posted by a push-button control: uscmd is the window identifier of the push button.
CMDSRC_MENU
Posted by a menu control: uscmd is the identifier of the menu item.
CMDSRC_ACCELERATOR
Posted as the result of an accelerator: uscmd is the accelerator command value.
CMDSRC_OTHER
Other source: uscmd gives further control-specific information defined for each control type.

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