setwindowpos setwindowpos wm_size

如何有效的使用对话框之二
译者：徐景周(原作：NishantS )

1. 如何有效地使初始窗口不显示
当我们想让窗口初始时不显示时，通常会用ShowWindow(SW_HIDE),但实际上还是在启动是可以看到窗口一闪而过的痕迹。所以，可以使用下面的方法来实现它：
(1.1)先在构造函数中设置布乐变量 visible值为false.

visible = false;

void CTest_deleteDlg::OnWindowPosChanging(WINDOWPOS FAR* lpwndpos) {    if(!visible)        lpwndpos->flags &= ~SWP_SHOWWINDOW;    CDialog::OnWindowPosChanging(lpwndpos);}

visible = true;ShowWindow(SW_SHOW);

BOOL CFullScrDlgDlg::OnInitDialog(){    CDialog::OnInitDialog();    //...    int cx, cy;     HDC dc = ::GetDC(NULL);     cx = GetDeviceCaps(dc,HORZRES) +         GetSystemMetrics(SM_CXBORDER);     cy = GetDeviceCaps(dc,VERTRES) +        GetSystemMetrics(SM_CYBORDER);     ::ReleaseDC(0,dc);     //去除标题和边框    SetWindowLong(m_hWnd, GWL_STYLE,         GetWindowLong(m_hWnd, GWL_STYLE) &     (~(WS_CAPTION | WS_BORDER)));     // 置对话框为最顶端并扩充到整个屏幕    ::SetWindowPos(m_hWnd, HWND_TOPMOST,         -(GetSystemMetrics(SM_CXBORDER)+1),         -(GetSystemMetrics(SM_CYBORDER)+1),         cx+1,cy+1, SWP_NOZORDER);     //...    return TRUE; }

//捕捉并设置当前焦点窗口为我们的窗口AttachThreadInput(    GetWindowThreadProcessId(        ::GetForegroundWindow(),NULL),    GetCurrentThreadId(),TRUE);//置我们的为焦点窗口SetForegroundWindow();SetFocus(); //释放threadAttachThreadInput(    GetWindowThreadProcessId(        ::GetForegroundWindow(),NULL),    GetCurrentThreadId(),FALSE);

SetWindowPos(&this->wndTopMost,0,0,0,0,SWP_NOMOVE|SWP_NOSIZE);

void CTest_deleteDlg::OnMakeSmall() {    SetWindowPos(NULL,0,0,200,200,SWP_NOZORDER|SWP_NOMOVE);     }void CTest_deleteDlg::OnExpand() {    SetWindowPos(NULL,0,0,500,300,SWP_NOZORDER|SWP_NOMOVE);             }

//伸、缩在IDC_DYCREDITS和IDC_COPYRIGHT两STATIC控件间，做为分隔线BOOL CAbout::OnInitDialog() {        CDialog::OnInitDialog();//"关于"对话框中对话框可收缩效果        CRect Rect1,Rect2;                                                           //对话框收缩时大小                         GetDlgItem(IDC_DYCREDITS)->GetWindowRect(Rect1);         GetDlgItem(IDC_COPYRIGHT)->GetWindowRect(Rect2);         m_nReducedHeight = Rect1.Height()+(Rect1.top -Rect2.bottom)/2; //收缩后窗体高度        dlgRect.bottom -= (Rect1.Height()+(Rect1.top -Rect2.bottom)/2);         MoveWindow(&dlgRect);                                             //如果要显示对话框起始动态效果的话，不能使用该句        m_bVertical=false;                                //默认收缩对话框}// ---------------------------------------------------------//      名称: OnMore//      功能: 是否允许显示//      变量: 无//      返回: 无//      编写: 徐景周，2002.4.8// ---------------------------------------------------------void CAbout::OnMore() {        m_bVertical = !m_bVertical;                 if(m_bVertical == FALSE)        //不显示        {                 SetDlgItemText(ID_MORE,_T("更多>>"));                SizeWindow(m_nReducedHeight,true);//              m_DyCredits.EndScrolling();              //停止滚动        }         else                                            //显示        {                 SetDlgItemText(ID_MORE,_T("<<隐藏"));                SizeWindow(m_nReducedHeight,false);                m_DyCredits.StartScrolling();                   //开始滚动        }                 UpdateWindow(); }// ---------------------------------------------------------//      名称: SizeWindow//      功能: 伸展或收缩对话框    //      变量: ReduceHeight-收缩高度，bExtend-是否伸展//      返回: 无//      编写: 徐景周，2002.4.8// ---------------------------------------------------------    void CAbout::SizeWindow(int ReduceHeight, bool bExtend){        CRect rc;        GetWindowRect(&rc);        if(bExtend)        {                for (int i= 0; i < ReduceHeight; i++)                {                        rc.bottom--;                        MoveWindow(&rc);                }        }        else        {                for (int i= 0; i < ReduceHeight; i++)                {                        rc.bottom++;                        MoveWindow(&rc);                }        }}

SendMessage(DM_REPOSITION);

int CTest_deleteDlg::OnCreate(LPCREATESTRUCT lpCreateStruct) {    if (CDialog::OnCreate(lpCreateStruct) == -1)        return -1;          // TODO: Add your specialized creation code here    SetWindowLong(this->m_hWnd,GWL_STYLE,        GetWindowLong(this->m_hWnd,GWL_STYLE) |             WS_MINIMIZEBOX | WS_MAXIMIZEBOX);       return 0;}

ModifyStyle (NULL, WS_MAXIMIZEBOX);

BOOL CTest_deleteDlg::OnSetCursor(CWnd* pWnd, UINT nHitTest, UINT message) {    // TODO: Add your message handler code here and/or call default    SetCursor(AfxGetApp()->LoadStandardCursor(IDC_UPARROW));    // Now we return instead of calling the base class    return 0;       // return CDialog::OnSetCursor(pWnd, nHitTest, message);}

//红色背景、绿色前景SetDialogBkColor(RGB(255,0,0),RGB(0,255,0)); 

CFrameWnd *abc=new CFrameWnd();abc->Create(0,0,WS_OVERLAPPEDWINDOW);CNoTaskBarIconDlg dlg(abc);m_pMainWnd = &dlg;int nResponse = dlg.DoModal();if (nResponse == IDOK){}else if (nResponse == IDCANCEL){}delete abc;

BOOL CNoTaskBarIconDlg::OnInitDialog(){    CDialog::OnInitDialog();    ModifyStyleEx(WS_EX_APPWINDOW,0);    SetIcon(m_hIcon, TRUE);  // Set big icon    SetIcon(m_hIcon, FALSE); // Set small icon            // TODO: Add extra initialization here            return TRUE;  // return TRUE  unless you set the focus to a control}

BOOL HelpDialog::OnInitDialog() {    ModifyStyleEx(0, WS_EX_CONTEXTHELP);    return CDialog::OnInitDialog();}

BOOL HelpDialog::OnHelpInfo(HELPINFO* pHelpInfo) {    short state = GetKeyState (VK_F1);    if (state < 0)   // F1 key is down, get help for the dialog        return CDialog::OnHelpInfo(pHelpInfo);    else    {    // F1 key not down, get help for specific control        if (pHelpInfo->dwContextId)            WinHelp (pHelpInfo->dwContextId,                 HELP_CONTEXTPOPUP);        return TRUE;    }}