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How can i display multiple bitmaps one after the other on Modal dialog.

Posted on 2004-11-08
Medium Priority
Last Modified: 2013-11-20

I asked this question before only. I think that was not clear.
I am displaying BMP image on Modal dialog box by using Dierct Draw. I would like to show multiple BMP images on the same area, when mouse events occures(Ex. in OnLButtonDown()). Now i am able to display another BMP image when mouse event fired. But the problem is , Next BMP image is diaplying on before one. I think it is not repianting the window, when event occures. Please help me to solve this problem.


Question by:vihar123
  • 3
LVL 45

Expert Comment

ID: 12522956
Assuming you have an OnPaint routine that takes an ID/path to the bitmap.

DrawBMP(m_szPATH);  //draw bitmap from path - a function you have coded

When you get the mouse event
Invalidate(); //flag dlg for redrawing
UpdateWindow(); //force a repaint

Author Comment

ID: 12523086
Thank you for your reply. I tried with above functions. But still that problem is not solved. Please see my code once.
BOOL CDialogSampleDlg::OnInitDialog()
 hwnd = ((CStatic*) this->GetDlgItem(IDC_STATIC))->m_hWnd;
 dd_obj.Init(hwnd); // Set up our DirectDraw interface AND save off a compatible HDC AND load our clipper
 dd_obj.InitSurfaces(hwnd); // This will init our primary and back surfaces
 dd_obj.LoadBackSurface(AfxGetInstanceHandle(),"ball.bmp",hwnd); // This will load the backSurface with our bitmap
 return TRUE;  

void CDialogSampleDlg::OnPaint()
    dd_obj.Draw(hwnd);// This draws the backSurface to the primarySurface
void CDialogSampleDlg::OnLButtonDown(UINT nFlags, CPoint point)
   CDialog::OnLButtonDown(nFlags, point);

LVL 45

Accepted Solution

AndyAinscow earned 1500 total points
ID: 12523884
This line is dangerous - give your static control a unique ID eg IDC_STATIC_DD
hwnd = ((CStatic*) this->GetDlgItem(IDC_STATIC))->m_hWnd;

and use
hwnd = ((CStatic*) this->GetDlgItem(IDC_STATIC_DD))->m_hWnd;

Does that help?
If not does your dd_obj have a function to delete the back surface?  Does the LoadBackSurface return a value, if so is it indecating success?
LVL 45

Expert Comment

ID: 12530604
Excerpt from help
CWnd* GetDlgItem( int nID ) const;

void CWnd::GetDlgItem( int nID, HWND* phWnd ) const;

Return Value

A pointer to the given control or child window. If no control with the integer ID given by the nID parameter exists, the value is NULL.

The returned pointer may be temporary and should not be stored for later use.     ***************************

You MUST NOT store the returned hwnd in the OnInitDialog.  You need to use that code to get it each time you intend to use it.

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