C / C++ / MFC

void CTest::OnRadioDirection(UINT nID)
{

	switch(nID)
	{
	case IDC_1:								  
		id = 0;
		break;
	case IDC_2:
		id = 1;
		break;
	case IDC_3:
		id = 2;
		break;
	case IDC_4:
		id = 3;
	default:
		break;
	}
	m_pGUIDoc->UpdateAllViews(NULL);
}


void CTest::DrawPreview(CDC* pDC)
{
	if (m_pImg[id])            //m_pImg is a IplImage,can say is a image
	{                          //the id is the no of the radio button,
//eg,button 1 = id = 0,button 2 = id =1 
		BYTE* pImg = (BYTE*)m_pImg[id]->imageData;
		CvSize size = cvGetSize(m_pImg[id]);
		CRect rcPreview;
		if (id == 0)
			GetDlgItem(IDC_picture1)->GetWindowRect(&rcPreview);
		else if (id == 1)
			GetDlgItem(IDC_PICTURE2)->GetWindowRect(&rcPreview);
		else if (id == 2)
			GetDlgItem(IDC_PICTURE3)->GetWindowRect(&rcPreview);
		else if (id == 3)
			GetDlgItem(IDC_PICTURE4)->GetWindowRect(&rcPreview);
		else
			;

		ScreenToClient(&rcPreview);
	
		double scaleX = (double)size.width / (double)rcPreview.Width();
		double scaleY = (double)size.height / (double)rcPreview.Height();
		double scaleToFit = (scaleX > scaleY) ? scaleX : scaleY;
		int iWidth = (int) ((double)size.width / scaleToFit);
		int iHeight = (int) ((double)size.height / scaleToFit);
		int iOffX = rcPreview.left;
		int iOffY = rcPreview.top;

		HDC hDC = pDC>GetSafeHdc();
		SetStretchBltMode(hDC, COLORONCOLOR);
		StretchDIBits(hDC, iOffX, iOffY, iWidth, iHeight, 
			0, 0, size.width, size.height, pImg, GetBitmapTag(), DIB_RGB_COLORS, SRCCOPY);
	}
}

void CTest::OnPaint()
{
	CPaintDC dc(this); // device context for painting
	// TODO: Add your message handler code here
	// Do not call CDialog::OnPaint() for painting messages
	DrawPreview(&dc);
}

void CTest::DrawPreview(CDC *pDC)
{
  UINT PicCtrlIDs[] = {IDC_Picture1, IDC_Picture2, IDC_Picture3, IDC_Picture4};
  for (int i = 0; i < 4; i++)
    if (m_pImg[i])
    {
      CWnd *PicControl = GetDlgCtrlItem(PicCtrlIDs[i]);
      ...
      //Get the rect for the pic control and draw m_pImg[i] to it...
      ..
     }
}

DevelopmentNoob wrote:

Now i got 4 picture control and 4 button in 1 dialog. I can load the image into picture control, but when i load the second picture, the 1st image will disappear. How to make it fix to there?

pearllyn wrote:

but i need the source code in VB

pearllyn wrote:

the source code have to be in VB.