Wed, 11/13/2002 - 18:19
Hi,
I'm trying to get the Pixelinformation of my View into a Dialog-Window. And I don't see any reason why the following code does not work...
void CViewDlg::OnPaint()
{
CPaintDC dc(this); // device context for painting
Handle(Aspect_Window) anAspectWindow = myView->Window();
Handle(WNT_Window) aWNTWindow = Handle(WNT_Window)::DownCast(anAspectWindow);
HWND hWindow = (HWND)aWNTWindow->HWindow();
RECT SrcRect;
::GetClientRect(hWindow,&SrcRect);
HDC hDCWindow=::GetDC(hWindow);
HDC hDCDialog=(HDC)dc;
HDC hDCMem=CreateCompatibleDC(hDCWindow);
::ReleaseDC(hWindow, hDCWindow);
RECT DstRect;
::GetClientRect(GetSafeHwnd(),&DstRect);
int WindowWidth=SrcRect.right;
int WindowHeight=SrcRect.bottom;
if(SelectObject(hDCMem,aWNTWindow->HPixmap())==NULL)
AfxMessageBox("Error in Select Pixmap");
if(!BitBlt(hDCDialog,0,0,WindowWidth,WindowHeight,hDCMem,0,0,SRCCOPY))
AfxMessageBox("Error in BitBlt");
ReleaseDC(&dc);
// TODO: Code für die Behandlungsroutine für Nachrichten hier einfügen
// Kein Aufruf von CDialog::OnPaint() für Zeichnungsnachrichten
}
Most of it is similar to the source code of Opencascade, for example in the RestoreArea-Function of WNT_Window or the SaveBitmapToFile-Function of WNT_ImageProcessor.
Does anybody know why my code does not work?
Espacially the line where I select the HPixmap into the Memory DC doesn't work, which I check with the MessageBox (it always appears!).
Thanks Andreas
Wed, 11/13/2002 - 18:35
Hi Andreas,
Do you try to have a OCC View in a dialog box ?
I think it is not the easiest way to do ...
Wed, 11/13/2002 - 18:41
Actually I don't want to have a real view in the Dialog box, but single "Screenshots" of it.
If you know a easier way to do this - please let me know !!!
I try to do it for the last few days now...
Andreas
Wed, 11/13/2002 - 18:56
Well, dump the V3d_View in a .bmp on disk, and in the OnInitdialog, read the BMP, resize it if you want, and display it in your dialog box.
HTH
Wed, 11/13/2002 - 19:08
Ok, that would be possible and I know that it would work - I thought about it, but its not suitable for what I want. Actually, the preview of the picture in a dialog-box is just something like a test.
Later on I want to take a few hundred screenshots to pass them over to some image-processing functions.
If I would dump every single one to disk it would take too long... That's why I wanted to avoid the dump function and tried to find out how it works and do the same to save the screenshots in memory-bitmaps.
The dialog-box is just for the testing stage to check if I succesfully captured the view.
Hope you have another tip for me how to do this.
Andreas
Wed, 11/13/2002 - 19:36
get the pixmap from V3d::ToPixMap.
In the WNT_Pixmap class, you have trhe bitmap.
Unfortunaly, you cannot access the bitmap ( no access method )
2 solutions :
1/ you add a GetBitmap method to WNT_PixMap, but you will need to recompile OCC.
2/ inheritance :
you inherits from V3d_View and from WNT_Pixmap.
In the method V3d_View::ToPixMap, you change the pixmap from WNT_Pixmap to yours.
3/ ( i'm not sure it will work, but you can try ) : you change only the header file WNT_Pixmap.hxx to put the myBitmap field as public. You can try to access it in your programm
Viel Glueck !
Thu, 11/14/2002 - 16:58
Thank you very much !!!
Your 3 hint helped!
I simply changed the WNT_Pixmap.hxx and set the mBitmap field to public and now my Code works.
For everybody who is interested in it, here it is, a bit changed to the previous posting:
void CViewDlg::CaptureView()
{
Handle(Aspect_Window) anAspectWindow = myView->Window();
Handle(WNT_Window) aWNTWindow = Handle(WNT_Window)::DownCast(anAspectWindow);
HWND hWindow = (HWND)aWNTWindow->HWindow();
RECT r;
::GetClientRect(hWindow,&r);
int WindowWidth=r.right;
int WindowHeight=r.bottom;
HDC hDCWindow=::GetDC(hWindow);
HDC hDCMem=CreateCompatibleDC(hDCWindow); //MemoryDC
HDC hDCDialog=*GetDC();
HDC hDCMem2=CreateCompatibleDC(hDCDialog); //MemoryDC
HBITMAP hMemBmp=CreateCompatibleBitmap(hDCWindow,WindowWidth,WindowHeight);
HGDIOBJ hOldObject=SelectObject(hDCMem,hMemBmp);
SelectObject(hDCWindow,(HBITMAP)aWNTWindow->HPixmap());
BitBlt(hDCMem,0,0,WindowWidth,WindowHeight,hDCWindow,0,0,SRCCOPY);
SelectObject(hDCMem,hOldObject);
SelectObject(hDCMem2,hMemBmp);
BitBlt(hDCDialog,10,10,WindowWidth,WindowHeight,hDCMem2,0,0,SRCCOPY);
::ReleaseDC((HWND)this,hDCDialog);
::ReleaseDC(hWindow,hDCWindow);
DeleteDC(hDCMem);
DeleteDC(hDCMem2);
}
It's just a bit funny, that it even captures the content of windows which lie over the view-window. so sometimes even the dialog window :-)
But for me its OK !
Thanks for your help,
Andreas
Wed, 04/19/2006 - 14:49
Hi Andres,
Thanks for your hints.
I m using this in my code but i m having some problem. I have one application which i found on top of the desktop so if it is over the OCC_View, it's image also get captured in the CaptureView function. Can you tell why this is happening?
Thanks for your code.
Looking forward to your reply.
Ashesh