窗口绘制问题

[ojc520520]

绘制了标题了，但为什么当打开CFileDialog弹出文件对话框的时候标题栏会闪出原来被覆盖的标题栏；怎么才可以让被覆盖的标题栏不闪出来；

本了是这样的

但打开文件对话框后编程这样的了，但是一闪而过


代码都在这里了，其它都是向导默认生成的；

LRESULT Ctest2Dlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam)
{
	if (message==WM_MOVE||message==WM_PAINT||message==WM_NCPAINT||message==WM_NCACTIVATE ||message == WM_NOTIFY)
	{
		CDC* pWinDC = GetWindowDC();
		if (pWinDC)
			DrawTitleBar(pWinDC);
		ReleaseDC(pWinDC);
	}
	return CDialogEx::WindowProc(message, wParam, lParam);
}


void Ctest2Dlg::DrawTitleBar(CDC *pDC)
{
	
	CRect reWin;
	GetWindowRect(reWin);
	 CBitmap bit;
	 bit.LoadBitmap(IDB_BITMAP1); 
	CBrush brush(RGB(77, 77, 77));
	pDC->SelectObject(brush);
	pDC->PatBlt(0,0, reWin.Width(), GetSystemMetrics(SM_CYCAPTION)+10, PATCOPY);
	//CDC memdc;
	//memdc.CreateCompatibleDC(pDC);
	//memdc.SelectObject(bit);
	//pDC->StretchBlt(0,0,reWin.Width(), GetSystemMetrics(SM_CYCAPTION)+6,&memdc, 0,0,48,3,MERGECOPY);
	
}

void Ctest2Dlg::OnBnClickedButton1()
{
	// TODO: 在此添加控件通知处理程序代码
	CFileDialog OpenFileDlg(TRUE,NULL,NULL,0);
	if(OpenFileDlg.DoModal() == IDOK)
	{
		//........
	}
	return;
}

[redui]

你这绘制时机完全混乱，通常都是在PAINT类型的消息里面绘制，干嘛还要在MOVE之类的非绘制消息中绘制？何况不同消息里获取DC的方式也是不同的

[ojc520520]

引用 1 楼 redui 的回复:

你这绘制时机完全混乱，通常都是在PAINT类型的消息里面绘制，干嘛还要在MOVE之类的非绘制消息中绘制？何况不同消息里获取DC的方式也是不同的

我看网上的代码都是这样的，那我把WndProc中的其它消息都删除了，只剩下WM_PAINT情况还是会出现；

[邓学彬]

你这样绘制不乱才怪.不同的消息需要不同的处理,返回不同的值. 既然你自己绘制了,就得返回某些值,让系统不再处理相同消息才行. 比如WM_NCPAINT,你画一次,画完了调用WindowProc让系统再画一次? 应该直接返回0才对. WM_NCACTIVATE 应该返回TRUE 另外:WM_NCPAINT中最好调用 GetDCEx 获取 DC

case WM_NCPAINT:
{
    HDC hdc;
    hdc = GetDCEx(hwnd, (HRGN)wParam, DCX_WINDOW|DCX_INTERSECTRGN);
    // Paint into this DC
    ReleaseDC(hwnd, hdc);
    return 0;
}

具体查一下MSDN吧,每个消息都有详细说明,绝对不能这样乱用.

[ojc520520]

引用 3 楼 CometNet 的回复:

你这样绘制不乱才怪.不同的消息需要不同的处理,返回不同的值. 既然你自己绘制了,就得返回某些值,让系统不再处理相同消息才行. 比如WM_NCPAINT,你画一次,画完了调用WindowProc让系统再画一次? 应该直接返回0才对. WM_NCACTIVATE 应该返回TRUE 另外:WM_NCPAINT中最好调用 GetDCEx 获取 DC

case WM_NCPAINT:
{
    HDC hdc;
    hdc = GetDCEx(hwnd, (HRGN)wParam, DCX_WINDOW|DCX_INTERSECTRGN);
    // Paint into this DC
    ReleaseDC(hwnd, hdc);
    return 0;
}

具体查一下MSDN吧,每个消息都有详细说明,绝对不能这样乱用.

论坛今天老登入超时！ 偶像出现了；一直有看你的博客； 能帮我解决上面问题吗，就打开文件对话框标题栏不会闪。

[ojc520520]

引用 5 楼 schlafenhamster 的回复:

void CMyDlg::OnNcPaint() { // TODO: Add your message handler code here CDC* pWinDC = GetWindowDC(); CRect reWin; GetWindowRect(reWin); reWin.OffsetRect(-reWin.left,-reWin.top); //reWin.bottom=reWin.top+23; CBitmap bit; bit.LoadBitmap(IDB_BITMAP1); CBrush brush; brush.CreatePatternBrush(&bit); pWinDC->SelectObject(brush); pWinDC->PatBlt(3,3,reWin.Width()-6,GetSystemMetrics(SM_CYCAPTION),PATCOPY); pWinDC->SetBkMode(TRANSPARENT); pWinDC->TextOut(6,6,"SelfDraw Caption",16); ReleaseDC(pWinDC); // Do not call CDialog::OnNcPaint() for painting messages } void CMyDlg::OnActivate(UINT nState, CWnd* pWndOther, BOOL bMinimized) { CDialog::OnActivate(nState, pWndOther, bMinimized); // TODO: Add your message handler code here OnNcPaint(); }

谢谢

[schlafenhamster]

void CMyDlg::OnNcPaint() { // TODO: Add your message handler code here CDC* pWinDC = GetWindowDC(); CRect reWin; GetWindowRect(reWin); reWin.OffsetRect(-reWin.left,-reWin.top); //reWin.bottom=reWin.top+23; CBitmap bit; bit.LoadBitmap(IDB_BITMAP1); CBrush brush; brush.CreatePatternBrush(&bit); pWinDC->SelectObject(brush); pWinDC->PatBlt(3,3,reWin.Width()-6,GetSystemMetrics(SM_CYCAPTION),PATCOPY); pWinDC->SetBkMode(TRANSPARENT); pWinDC->TextOut(6,6,"SelfDraw Caption",16); ReleaseDC(pWinDC); // Do not call CDialog::OnNcPaint() for painting messages } void CMyDlg::OnActivate(UINT nState, CWnd* pWndOther, BOOL bMinimized) { CDialog::OnActivate(nState, pWndOther, bMinimized); // TODO: Add your message handler code here OnNcPaint(); }

[schlafenhamster]

或者:LRESULT CMyFileOpenDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) { // TODO: Add your specialized code here and/or call the base class if (message==WM_NCPAINT||message==WM_NCACTIVATE) { DrawCaption(); return 1; } return CDialog::WindowProc(message, wParam, lParam); } void CMyFileOpenDlg::DrawCaption() { CDC* pWinDC = GetWindowDC(); CRect reWin; GetWindowRect(reWin); reWin.OffsetRect(-reWin.left,-reWin.top); //reWin.bottom=reWin.top+23; CBitmap bit; bit.LoadBitmap(IDB_BITMAP1); CBrush brush; brush.CreatePatternBrush(&bit); pWinDC->SelectObject(brush); pWinDC->PatBlt(3,3,reWin.Width()-6,GetSystemMetrics(SM_CYCAPTION),PATCOPY); pWinDC->SetBkMode(TRANSPARENT); pWinDC->TextOut(6,6,"SelfDraw Caption",16); ReleaseDC(pWinDC); }