VC++ Windows窗口处理函数【固定窗口】_vc++ onsyscommand-优快云博客

本文链接：https://blog.youkuaiyun.com/wwje/article/details/2045764

本文详细介绍了VC++中CMainFrame类的OnSysCommand函数，用于处理WM_SYSCOMMAND消息。该消息涉及多种系统命令，如窗口关闭、最大化、最小化、移动等。通过对uCmdType参数的解析，可以实现不同操作的响应，例如SC_MOVE、SC_RESTORE等。同时，还列举了WM_SYSCOMMAND消息中其他可能的命令类型及其作用。

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void   CMainFrame::OnSysCommand(UINT   nID,   LPARAM   lParam)
{
switch(nID   &   0xFFF0)
{
case   SC_MOVE:
return;
case   SC_RESTORE:
if(!IsIconic())return;
                    break;
}
CFrameWnd::OnSysCommand(nID,   lParam);
}

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.