在MFC SDI应用程序中保持窗口位置

• 下载source files - 1.13 Kb
• 下载demo project - 26.1 Kb

介绍 在本文中，我们将展示一种方法，它可以在一次执行和另一次执行之间保持应用程序窗口的位置和大小。 步骤 添加一个WM_CLOSE处理程序到CMainFrame类:复制Code

void CMainFrame::OnClose() 
{
    WINDOWPLACEMENT    wp;

    // before it is destroyed, save the position of the window
    wp.length = sizeof wp;

    if ( GetWindowPlacement(&wp) )
    {

        if ( IsIconic() )
          // never restore to Iconic state
          wp.showCmd = SW_SHOW ;

        if ((wp.flags & WPF_RESTORETOMAXIMIZED) != 0)
          // if maximized and maybe iconic restore maximized state
          wp.showCmd = SW_SHOWMAXIMIZED ;

        // and write it to the .INI file
        WriteWindowPlacement(&wp);
    }
    
    CFrameWnd::OnClose();
}

重写CMainFrame类的ActivateFrame()方法:Hide  收缩,复制Code

void CMainFrame::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
      WINDOWPLACEMENT wp;
      
      if ( !ReadWindowPlacement(&wp) )
      {
          ShowWindow(nCmdShow);
      }
      else
      {
         if ( nCmdShow != SW_SHOWNORMAL )  
           wp.showCmd = nCmdShow;

         SetWindowPlacement(&wp);
         // ShowWindow(wp.showCmd);
      }

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

    return ;
}

ReadWindowPlacement和WriteWindowPlacement如下所示:收缩,复制Code

static char szSection[]   = "Settings";
static char szWindowPos[] = "WindowPos";
static char szFormat[] = "%u,%u,%d,%d,%d,%d,%d,%d,%d,%d";

BOOL CMainFrame::ReadWindowPlacement(WINDOWPLACEMENT *pwp)
{
    CString strBuffer;
    int    nRead ;

    strBuffer = AfxGetApp()->GetProfileString(szSection, szWindowPos);
    if ( strBuffer.IsEmpty() )  return FALSE;

    nRead = sscanf(strBuffer, szFormat,
                &pwp->flags, &pwp->showCmd,
                &pwp->ptMinPosition.x, &pwp->ptMinPosition.y,
                &pwp->ptMaxPosition.x, &pwp->ptMaxPosition.y,
                &pwp->rcNormalPosition.left,  &pwp->rcNormalPosition.top,
                &pwp->rcNormalPosition.right, &pwp->rcNormalPosition.bottom);
    if ( nRead != 10 )  return FALSE;
    pwp->length = sizeof(WINDOWPLACEMENT);

    return TRUE;
}

// Write a window placement to settings section of app's ini file.

void CMainFrame::WriteWindowPlacement(WINDOWPLACEMENT *pwp)
{
    char szBuffer[sizeof("-32767")*8 + sizeof("65535")*2];
    int max = 1;
    CString s;

    sprintf(szBuffer, szFormat,
            pwp->flags, pwp->showCmd,
            pwp->ptMinPosition.x, pwp->ptMinPosition.y,
            pwp->ptMaxPosition.x, pwp->ptMaxPosition.y,
            pwp->rcNormalPosition.left, pwp->rcNormalPosition.top,
            pwp->rcNormalPosition.right, pwp->rcNormalPosition.bottom);
     AfxGetApp()->WriteProfileString(szSection, szWindowPos, szBuffer);

}

这两个函数的灵感来自微软Visual c++ 1.52附带的SUPERPAD示例。 如果您希望将窗口位置信息存储在注册表而不是.ini文件中，只需在项目主.cpp文件的InitInstance()方法中调用AddDocTemplate之后将其添加。隐藏,复制Code

SetRegistryKey("My Company Name");

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