WM_SYSCOMMAND 메세지를 사용하세요.



if M.WParam = SC_CLOSE then

begin

M.Result := 0;

end

else

...





A window receives this message when the user chooses a command from the window menu (also known as the System menu or Control menu) or when the user chooses the Maximize button or Minimize button.



WM_SYSCOMMAND

uCmdType = wParam; // type of system command requested

xPos = LOWORD(lParam); // horizontal postion, in screen coordinates

yPos = HIWORD(lParam); // vertical postion, in screen coordinates





Parameters



uCmdType



Specifies the type of system command requested. This can be one of these values:



Value Meaning

SC_CLOSE Closes the window.

SC_CONTEXTHELP Changes the cursor to a question mark with a pointer. If the user then clicks a control in the dialog box, the control receives a WM_HELP message.

SC_DEFAULT Selects the default item; the user double-clicked the window menu.

SC_HOTKEY Activates the window associated with the application-specified hot key. The low-order word of lParam identifies the window to activate.

SC_HSCROLL Scrolls horizontally.

SC_KEYMENU Retrieves the window menu as a result of a keystroke.

SC_MAXIMIZE (or SC_ZOOM) Maximizes the window.

SC_MINIMIZE (or SC_ICON) Minimizes the window.

SC_MONITORPOWER Windows 95 only: Sets the state of the display. This command supports devices that have power-saving features, such as a battery-powered personal computer.

SC_MOUSEMENU Retrieves the window menu as a result of a mouse click.

SC_MOVE Moves the window.

SC_NEXTWINDOW Moves to the next window.

SC_PREVWINDOW Moves to the previous window.

SC_RESTORE Restores the window to its normal position and size.

SC_SCREENSAVE Executes the screen saver application specified in the [boot] section of the SYSTEM.INI file.

SC_SIZE Sizes the window.

SC_TASKLIST Executes or activates Windows Task Manager.

SC_VSCROLL Scrolls vertically.





xPos



Specifies the horizontal position of the cursor, in screen coordinates, if a window menu command is chosen with the mouse. Otherwise, the xPos parameter is not used.



yPos



Specifies the vertical position of the cursor, in screen coordinates, if a window menu command is chosen with the mouse. This parameter is -1 if the command is chosen using a system accelerator, or zero if using a mnenomic.







Return Values



An application should return zero if it processes this message.



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