WM_COMMAND - Parameters

uscmd (USHORT)

Command value.

It is the responsibility of the application to be able to relate uscmd to an application function.

ussource (USHORT)

Source type.

Identifies the type of control:

CMDSRC_PUSHBUTTON

Posted by a push-button control. uscmd is the window identity of the push button.
CMDSRC_MENU
Posted by a menu control. uscmd is the identity of the menu item.
CMDSRC_ACCELERATOR
Posted as the result of an accelerator. uscmd is the accelerator command value.
CMDSRC_FONTDLG
Font dialog. uscmd is the identity of the font dialog.
CMDSRC_FILEDLG
File dialog. uscmd is the identity of the file dialog.
CMDSRC_OTHER
Other source. uscmd gives further control-specific information defined for each control type.

uspointer (USHORT)

Pointer-device indicator.

TRUE

The message is posted as a result of a pointer-device operation.
FALSE
The message is posted as a result of a keyboard operation.

ulReserved (ULONG)

Reserved value, should be 0.

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