如何截取最小化按钮或恢复按钮被按下的消息
编号：QA001879
建立日期: 1999年10月20日 最后修改日期：1999年10月20日
所属类别：
杨树叶子:
Visual C++5.0
Windows 95
请问我如何截取最小化按钮或恢复按钮被按下的消息，WM_SIZE是在窗口被改变尺寸后才发送的，现在我想在窗口尺寸被改变之前进行自已的处理，然后才决定是否交由系统将窗口最小化或最大化，该如何做呢？请不吝赐教，此致衷心感谢！
回答:
你应该截取 WM_SYSCOMMAND消息。该消息参数为：
uCmdType = wParam; // type of system command requested
xPos = LOWORD(lParam); // horizontal postion, in screen coordinates
yPos = HIWORD(lParam); // vertical postion, in screen coordinates
其中uCmdType表示用户的选择：
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 System 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 System 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 System 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.
此问题由李海回答。
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