关于MFC中窗口最大化的两篇文章

文一：转载（http://dev.csdn.net/htmls/28/28675.html）

doc_view结构中让窗口一开始就最大化探讨

做者：enoloo

通常的作法是在 C**App::InitInstance()中，修改为这样：
{
 //...
 m_pMainWnd->ShowWindow(SW_SHOWMAXIMIZED);
 m_pMainWnd->UpdateWindow();
 //...
}
或者，还在 CMainFrame::PreCreateWindow(CREATESTRUCT& cs)中，添加：
{
 //...
 cs.style |= WS_MAXIMIZE;
 //...
}

这种作法能产生窗口最大化，但效果是显示的时候窗口从普通大小"闪"到最大化。还有的作法，是先将窗口隐藏，而后再最大化。那么怎样使窗口正常一开始出现就最大化？看看下面的流程,从 C**App::InitInstance()中的ProcessShellCommand(...)开始：
{
 //...
 //ProcessShellCommand中第一次显示了窗口
 if (!ProcessShellCommand(cmdInfo))
  return FALSE;
 m_pMainWnd->ShowWindow(SW_SHOWMAXIMIZED);
 m_pMainWnd->UpdateWindow();
 //...
}

->CWinApp::ProcessShellCommand 
->AfxGetApp()->OnCmdMsg(ID_FILE_NEW, 0, NULL, NULL)  
  //若是你本身处理了ID_FILE_NEW要调用CWinApp::OnFileNew()
->CWinApp::OnFileNew()
->CDocManager::OnFileNew() 
->CSingleDocTemplate::OpenDocumentFile  //当前文档模板初始化
->CSingleDocTemplate::CreateNewDocument  //建立文档
 //加载资源并建立主窗口(顺便建立视图)，但没显示
->CSingleDocTemplate::CreateNewFrame 
->CFrameWnd::InitialUpdateFrame
  {
 //...
 int nCmdShow = -1;      // default
 CWinApp* pApp = AfxGetApp();
 if (pApp != NULL && pApp->m_pMainWnd == this)
 {
  nCmdShow = pApp->m_nCmdShow; // use the parameter from WinMain
  pApp->m_nCmdShow = -1; // set to default after first time
 }
 ActivateFrame(nCmdShow); //在这里第一次显示窗口
 //...
  }
->CFrameWnd::ActivateFrame(int nCmdShow)
 // nCmdShow is the normal show mode this frame should be in
  {
 // translate default nCmdShow (-1)
 if (nCmdShow == -1)
 {
  if (!IsWindowVisible())
   nCmdShow = SW_SHOWNORMAL;
  else if (IsIconic())
   nCmdShow = SW_RESTORE;
 }

 // bring to top before showing
 BringToTop(nCmdShow);

 if (nCmdShow != -1)
 {
  // show the window as specified
  ShowWindow(nCmdShow);  //第一次显示窗口

  // and finally, bring to top after showing
  BringToTop(nCmdShow);
 }
  }
->***

从上面能够看出，CWinApp::ProcessShellCommand函数建立了窗口并显示，这是窗口第一次显示，先于：
 m_pMainWnd->ShowWindow(SW_SHOWMAXIMIZED);
 m_pMainWnd->UpdateWindow();

怎么解决问题？ 然窗口第一次显示就最大化？

 CCommandLineInfo cmdInfo;
 ParseCommandLine(cmdInfo);

 // Dispatch commands specified on the command line
 //在ParseCommandLine以后，ProcessShellCommand以前，添加这句!!!
 m_nCmdShow = SW_SHOWMAXIMIZED; 
 if (!ProcessShellCommand(cmdInfo))
  return FALSE;

 // The one and only window has been initialized, so show and update it.
 m_pMainWnd->ShowWindow(SW_SHOWMAXIMIZED);
 m_pMainWnd->UpdateWindow();

问题解决。

文二：转载http://blog.csdn.net/ziren235/archive/2006/05/19/745651.aspx

如何让MFC窗口启动时最大化 收藏

这两天在网上搜了好多，都不行，由于都是同一篇文章的转载，因而只好本身慢慢摸索。终于，黄天不负苦心人。

只需将App类InitInstance()函数中m_pMainWnd->ShowWindow()的参数改成SW_SHOWMAXIMIZED便可。

微软MSDN网页中有相关介绍：

MFC Library Reference

CWnd::ShowWindow

Sets the visibility state of the window.

BOOL ShowWindow(  int nCmdShow );

Parameters

nCmdShow

Specifies how the CWnd is to be shown. It must be one of the following values:

• SW_HIDE   Hides this window and passes activation to another window.
• SW_MINIMIZE   Minimizes the window and activates the top-level window in the system's list.
• SW_RESTORE   Activates and displays the window. If the window is minimized or maximized, Windows restores it to its original size and position.
• SW_SHOW   Activates the window and displays it in its current size and position.
• SW_SHOWMAXIMIZED   Activates the window and displays it as a maximized window.
• SW_SHOWMINIMIZED   Activates the window and displays it as an icon.
• SW_SHOWMINNOACTIVE   Displays the window as an icon. The window that is currently active remains active.
• SW_SHOWNA   Displays the window in its current state. The window that is currently active remains active.
• SW_SHOWNOACTIVATE   Displays the window in its most recent size and position. The window that is currently active remains active.
• SW_SHOWNORMAL   Activates and displays the window. If the window is minimized or maximized, Windows restores it to its original size and position.

Return Value

Nonzero if the window was previously visible; 0 if the CWnd was previously hidden.