CWnd::PreCreateWindowvirtual BOOL PreCreateWindow( CREATESTRUCT& cs );/*框架在即将创建窗口前调用框架类的 PreCreateWindow。通过修改传递给 PreCreateWindow 的结构 CREATESTRUCT，应用程序可以更改用于创建窗口的属性。Called by the framework before the creation of the Windows window attached to this CWnd object.*/struct tagCREATESTRUCT /*CREATESTRUCT结构体中成员变量的类型和个数和创建窗口的函数CreateWindowEx()的参数和个数完全一致，只是顺序相反。The CREATESTRUCT structure defines the initialization parameters passed to the window procedure of an application. These members are identical to the parameters of the CreateWindowEx function. *///可以重写PreCreateWindow()虚函数，在函数内部通过修改CREATESTRUCT结构的引用cs，达到修改窗口的目的，就如同调用了CreateWindowEx()创建一个新的窗口。//例如通过修改cs.cx和cs.cy来指定窗口的大小，但要注意当修改cs.lpszClass时，要先注册同名的WNDCLASS窗口类。//在单文档界面 (SDI) 应用程序中，框架中的默认窗口样式是 WS_OVERLAPPEDWINDOW 和 FWS_ADDTOTITLE 样式的组合。(MSDN详细参考Frame-Window Styles) demo1 (创建前指定窗口的大小和标题)BOOL CMainFrame::PreCreateWindow(CREATESTRUCT& cs){if( !CFrameWnd::PreCreateWindow(cs) )return FALSE;// TODO: Modify the Window class or styles here by modifying// the CREATESTRUCT cs//修改窗口大小cs.cx = 300; cs.cy = 200;//修改窗口标题cs.style &= ~FWS_ADDTOTITLE;//FWS_ADDTOTITLE是一种MFC类型，用来指示框架将文档的标题到窗口的标题，去掉此类型cs.lpszName = "My window";return TRUE;}======================================================================================================================demo2 (创建前指定窗口的图标、光标和背景)//首先编写自己的WNDCLASS窗口类。//调用RegisterClass()注册窗口类。//修改cs.lpszClass为窗口类的名字。//在框架窗口中只能修改图标//光标和背景在View类中改变BOOL CMainFrame::PreCreateWindow(CREATESTRUCT& cs){ if( !CFrameWnd::PreCreateWindow(cs) ) return FALSE; //设计一个新的窗口类WNDCLASS wndcls;wndcls.cbClsExtra = 0;wndcls.cbWndExtra = 0;wndcls.hbrBackground = (HBRUSH)GetStockObject(BLACK_BRUSH);//背景在视图类中产生效果，wndcls.hCursor = LoadCursor(NULL,IDC_HELP);//光标在视图类中产生效果wndcls.hIcon = LoadIcon(NULL,IDI_ERROR);//图标被修改了wndcls.hInstance = AfxGetInstanceHandle();//获取当前实例句柄wndcls.lpfnWndProc = ::DefWindowProc;//调用默认的窗口过程wndcls.lpszClassName = "SYAU";//为cs.lpszClass赋值 wndcls.lpszMenuName = NULL;//菜单的名字，在构造单文档模板时指定wndcls.style = CS_HREDRAW | CS_VREDRAW;//窗口类的类型 //注册新的窗口类RegisterClass(&wndcls);//在cs中修改窗口类的类名cs.lpszClass = "SYAU";return TRUE;}BOOL CStyleView::PreCreateWindow(CREATESTRUCT& cs){// TODO: Modify the Window class or styles here by modifying// the CREATESTRUCT cs//修改窗口的光标和背景cs.lpszClass = "SYAU";//SYAU窗口类已经注册，可以在任何地方使用return CView::PreCreateWindow(cs);}======================================================================================================================AfxRegisterWndClass LPCTSTR AFXAPI AfxRegisterWndClass( UINT nClassStyle, HCURSOR hCursor = 0, HBRUSH hbrBackground = 0, HICON hIcon = 0 ); /*Return ValueA null-terminated string containing the class name. You can pass this class name to the Create member function in CWnd or other CWnd-derived classes to create a window. The name is generated by the Microsoft Foundation Class Library.*/demo3 (创建前指定窗口的图标、光标和背景)//AfxRegisterWndClass简化构造新窗口类的步骤//效果相同BOOL CMainFrame::PreCreateWindow(CREATESTRUCT& cs){if( !CFrameWnd::PreCreateWindow(cs) )return FALSE;cs.lpszClass = AfxRegisterWndClass(CS_HREDRAW|CS_VREDRAW, 0, 0, LoadIcon(NULL,IDI_WARNING));return TRUE;}BOOL CStyleView::PreCreateWindow(CREATESTRUCT& cs){//修改窗口的光标和背景cs.lpszClass = AfxRegisterWndClass(CS_HREDRAW|CS_VREDRAW, LoadCursor(NULL,IDC_CROSS), (HBRUSH)GetStockObject(BLACK_BRUSH),0);return CView::PreCreateWindow(cs);}//The SetWindowLong function changes an attribute of the specified window. //设定指定窗口的属性LONG SetWindowLong( HWND hWnd, // handle to window int nIndex, // offset of value to set LONG dwNewLong // new value);//The GetWindowLong function retrieves information about the specified window. //获取指定窗口的属性LONG GetWindowLong( HWND hWnd, // handle to window int nIndex // offset of value to retrieve);//在OnCreate()中去调用SetWindowLong来修改已经创建好的窗口。//SetWindowLong(m_hWnd,GWL_STYLE,WS_OVERLAPPEDWINDOW);//取消FWS_ADDTOTITLE属性demo4 (取消已经创建的窗口最大化框功能)//在OnCreate()中添加如下代码int CMainFrame::OnCreate(LPCREATESTRUCT lpCreateStruct){ //... //部分代码省略 //...SetWindowLong(m_hWnd,GWL_STYLE,GetWindowLong(m_hWnd,GWL_STYLE) & ~WS_MAXIMIZEBOX);return 0;}======================================================================================================================//Platform SDK: Windows User InterfaceSetClassLongDWORD SetClassLong( HWND hWnd, // handle to window int nIndex, // index of value to change LONG dwNewLong // new value);demo5 (创建后指定窗口的图标、光标和背景)int CMainFrame::OnCreate(LPCREATESTRUCT lpCreateStruct){ //... //部分代码省略 //...SetClassLong(m_hWnd,GCL_HICON,(LONG)LoadIcon(NULL,IDI_ERROR));//改变图标return 0;}//在View类中响应WM_CREATE消息int CStyleView::OnCreate(LPCREATESTRUCT lpCreateStruct) {if (CView::OnCreate(lpCreateStruct) == -1)return -1;// TODO: Add your specialized creation code hereSetClassLong(m_hWnd,GCL_HBRBACKGROUND,(LONG)GetStockObject(BLACK_BRUSH));//改变背景SetClassLong(m_hWnd,GCL_HCURSOR,(LONG)LoadCursor(NULL,IDC_IBEAM));//改变光标return 0;}
