subject_44725.htm

一些关于vc的问答

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序号：44725 发表者：剑月明 发表日期：2003-06-23 00:01:40
<br>主题：怎样重载标题栏上的最小化，关闭按钮消息啊？
<br>内容：急！！
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回复者：bird 回复日期：2003-06-23 09:04:16
<br>内容：最大化、最小化将发送WM_SYSCOMMAND消息。要处理该消息，可以这么做： <BR>&nbsp;&nbsp;&nbsp;&nbsp;1、在Form的头文件中添加： <BR>&nbsp;&nbsp;&nbsp;&nbsp; void __fastcall RestrictMinimizeMaximize(TMessage &amp;Msg); <BR>&nbsp;&nbsp;&nbsp;&nbsp; <BR>&nbsp;&nbsp;&nbsp;&nbsp; BEGIN_MESSAGE_MAP <BR>&nbsp;&nbsp;&nbsp;&nbsp; MESSAGE_HANDLER(WM_SYSCOMMAND, TMessage, RestrictMinimizeMaximize) <BR>&nbsp;&nbsp;&nbsp;&nbsp; END_MESSAGE_MAP(TForm) <BR>&nbsp;&nbsp;&nbsp;&nbsp;2、在Form的单元文件中添加： <BR>&nbsp;&nbsp; <BR>&nbsp;&nbsp;&nbsp;&nbsp; void __fastcall TForm1::RestrictMinimizeMaximize(TMessage&amp; Msg) <BR>&nbsp;&nbsp;&nbsp;&nbsp; { <BR>&nbsp;&nbsp;&nbsp;&nbsp; if (Msg.WParam == SC_MINIMIZE) <BR>&nbsp;&nbsp;&nbsp;&nbsp; { <BR>&nbsp;&nbsp;&nbsp;&nbsp; //catches minimize... <BR>&nbsp;&nbsp;&nbsp;&nbsp; } <BR>&nbsp;&nbsp;&nbsp;&nbsp; else if (Msg.WParam == SC_MAXIMIZE) <BR>&nbsp;&nbsp;&nbsp;&nbsp; { <BR>&nbsp;&nbsp;&nbsp;&nbsp; //catches maximize... <BR>&nbsp;&nbsp;&nbsp;&nbsp; } <BR>&nbsp;&nbsp;&nbsp;&nbsp; TForm::Dispatch(&amp;Msg); <BR>&nbsp;&nbsp;&nbsp;&nbsp; // or "else TForm::Dispatch(&amp;Msg)" to trap <BR>&nbsp;&nbsp;&nbsp;&nbsp; } <BR>&nbsp;&nbsp;&nbsp;&nbsp;关闭窗口的消息为WM_CLOSE，C++Builder提供了OnClose事件
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<font color=red>答案被接受</font><br>回复者：bird 回复日期：2003-06-23 09:04:29
<br>内容：你应该截取 WM_SYSCOMMAND消息。该消息参数为： <BR>&nbsp;&nbsp;&nbsp;&nbsp;uCmdType = wParam; // type of system command requested <BR>&nbsp;&nbsp;&nbsp;&nbsp;xPos = LOWORD(lParam); // horizontal postion, in screen coordinates <BR>&nbsp;&nbsp;&nbsp;&nbsp;yPos = HIWORD(lParam); // vertical postion, in screen coordinates <BR>&nbsp;&nbsp;&nbsp;&nbsp;其中uCmdType表示用户的选择： <BR>&nbsp;&nbsp;&nbsp;&nbsp;SC_CLOSE Closes the window. <BR>&nbsp;&nbsp;&nbsp;&nbsp;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. <BR>&nbsp;&nbsp;&nbsp;&nbsp;SC_DEFAULT Selects the default item; the user double-clicked the System menu. <BR>&nbsp;&nbsp;&nbsp;&nbsp;SC_HOTKEY Activates the window associated with the application-specified hot key. The low-order word of lParam identifies the window to activate. <BR>&nbsp;&nbsp;&nbsp;&nbsp;SC_HSCROLL Scrolls horizontally. <BR>&nbsp;&nbsp;&nbsp;&nbsp;SC_KEYMENU Retrieves the System menu as a result of a keystroke. <BR>&nbsp;&nbsp;&nbsp;&nbsp;SC_MAXIMIZE (or SC_ZOOM) Maximizes the window. <BR>&nbsp;&nbsp;&nbsp;&nbsp;SC_MINIMIZE (or SC_ICON) Minimizes the window. <BR>&nbsp;&nbsp;&nbsp;&nbsp;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. <BR>&nbsp;&nbsp;&nbsp;&nbsp;SC_MOUSEMENU Retrieves the System menu as a result of a mouse click. <BR>&nbsp;&nbsp;&nbsp;&nbsp;SC_MOVE Moves the window. <BR>&nbsp;&nbsp;&nbsp;&nbsp;SC_NEXTWINDOW Moves to the next window. <BR>&nbsp;&nbsp;&nbsp;&nbsp;SC_PREVWINDOW Moves to the previous window. <BR>&nbsp;&nbsp;&nbsp;&nbsp;SC_RESTORE Restores the window to its normal position and size. <BR>&nbsp;&nbsp;&nbsp;&nbsp;SC_SCREENSAVE Executes the screen saver application specified in the [boot] section of the SYSTEM.INI file. <BR>&nbsp;&nbsp;&nbsp;&nbsp;SC_SIZE Sizes the window. <BR>&nbsp;&nbsp;&nbsp;&nbsp;SC_TASKLIST Executes or activates Windows Task Manager. <BR>&nbsp;&nbsp;&nbsp;&nbsp;SC_VSCROLL Scrolls vertically. <BR>
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回复者：VChen 回复日期：2003-06-25 00:17:50
<br>内容：下载例子
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