1、在AppWizard中更改Windos Style 来改变窗口初始是否最大化、最小化，以及是否允许更改。 2、更方便的改变可以在PreCreateWindow（）中，用代码实现，如     （1）//centern window at a certain percentage of full screen                #define PRCTG    50/100 //define percentage                int xSize =::GetSystemMetrics(SM_CSSCREEN);// more  information of the function see MSDN                 int ySize=::GetSystemMetrics(SM_CYSCREEN);                             cs.cx=xSize*PRCTG;//resize the  window                 cs.cy=ySize*PRCTG;                 cs.x=(xSize-cs.cx)/2;                    cs.y=(ySize-cs.cy)/2;                  return CMainFrame::PreCreateWindow(cs);        (2)  //delete the caption of the window                   cs.style&=~FWS_ADDTOTITLE;// more information see MSDN about CREATESTRUCT        (3) //remove the maximize and minimize button from caption                   cs.style&=~(WS_MAXIMIZEBOX|WS_MINIMIZEBOX);//you can remove only one button too         (4) // fixed the application window                    cs.style&=~WS_THICKFRAME;          (5)//maximize the application window when execute                    pMainFrame->ShowWindow(SW_SHOWMAXIMIZED)//in CWinApp                    pMainFrame->UpdateWindow();//you can minimize too           (6) //maximize a childwindow in a MDI application                   cs.style=WS_CHILD|WS_VISIBLE|WS_OVERLAPPED|WS_CAPTION_                   |WS_SYSMENU|FWS_ADDTOTITLE|WS_THICKFRAME                   |WS_MINIMIZEDBOX|WS_MAXIMIZEDBOX|WS_MAXIMIZE;                  return CMDIChildWnd::PreCreateWindow(cs);                                     

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