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  #1  
Old 10-Mar-2006, 02:09
katmayes katmayes is offline
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Can not display bmp in my picture control

Hye,

first of all...excuse me for my bad english, i come frome Switzerland

Well, i've got a problem with my MFC application.
I would like to display an image who come from my framgrabber buffer...
I 've verified that the image buffer was good, and it is, i can save the image on a file toto.bmp.
But, when i want to display my buffer image in the picture control....i can't.

Here is my code :
CPP / C++ / C Code:
void CFastFace_InterfaceDlg::OnInitializeCam() 
{
	Falconscr = new FalconSource(BOARD_NUMBER,INPUT,IMG_WIDTH,IMG_HEIGHT);
	Cbmp_frame= new CBitmap();
	CDC_Mem = new CDC();
	m_Picture = new CPicture();
	m_VideoNotModifiedDC=m_VideoNotModified.GetDC();		
	CDC_Mem->CreateCompatibleDC(m_VideoNotModifiedDC);	
}

#define DELETE_OBJ(oBJ) {if(oBJ!=NULL){delete oBJ; oBJ = NULL;}}
void CFastFace_InterfaceDlg::OnStartCapture() 
{
		
	while (NoStop)
	{
		imgBuffer=(unsigned char*)malloc(Falconscr->GetHeight()*Falconscr->GetWidth()*3*sizeof(char));
		Falconscr->Capture();
		Falconscr->GetImage(&imgBuffer);
		Falconscr->PumpMessages();	
		is_SaveImageMem(Falconscr->Gethandle(), "C:\\toto.bmp",(char*)imgBuffer,0);
		Cbmp_frame->CreateBitmap(Falconscr->GetWidth(),Falconscr->GetHeight(),1,3,imgBuffer);
		CDC_Mem->SelectObject(Cbmp_frame);
		m_VideoNotModifiedDC->BitBlt(0,0,Falconscr->GetWidth(),Falconscr->GetHeight(),CDC_Mem,0,0,SRCCOPY);
		Cbmp_frame->DeleteObject();
		free(imgBuffer);
	}
		
}

Here it is for the part who make this...
Someone know where is the mistake ?????

Thank you for your precious help

Greg
Last edited by LuciWiz : 10-Mar-2006 at 10:06. Reason: Please insert your C++ code between [c++] & [/c++] tags
  #2  
Old 10-Mar-2006, 06:01
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TurboPT TurboPT is offline
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Re: Can not display bmp in my picture control

With a quick glance, if m_Picture is the source to the picture control, it does not appear that m_Picture is given anything to display. Basically, the CPicture object is declared, but not used.
  #3  
Old 10-Mar-2006, 06:43
katmayes katmayes is offline
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Re: Can not display bmp in my picture control

I don't understand...
the source to my picture Control is m_VideoNotModifiedDC

like is declared here :

CPP / C++ / C Code:
void CFastFace_InterfaceDlg::DoDataExchange(CDataExchange* pDX)
{
	CDialog::DoDataExchange(pDX);
	//{{AFX_DATA_MAP(CFastFace_InterfaceDlg)
	DDX_Control(pDX, IDC_VIDEOMODIFIED, m_VideoModified);
	DDX_Control(pDX, IDC_VIDEONOTMODIFIED, m_VideoNotModified);
	//}}AFX_DATA_MAP
}

that's right...???
Last edited by LuciWiz : 10-Mar-2006 at 10:17. Reason: Please insert your C++ code between [c++] & [/c++] tags
  #4  
Old 10-Mar-2006, 07:37
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Re: Can not display bmp in my picture control

What is the intention of this line in OnInitializeCam()?

CPP / C++ / C Code:
   m_Picture = new CPicture();

Based on that first listing, I don't know what type 'm_VideoNotModified' has.
Should m_Picture possibly be m_VideoNotModified instead?
  #5  
Old 10-Mar-2006, 08:26
katmayes katmayes is offline
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Re: Can not display bmp in my picture control

Oh yes ...euh. .in fact.. i don't use it
do not pay attention about that....

m_VideoNotModified is declared as Control CStatic
DC_VIDEONOTMODIFIED is of type Bitmap
  #6  
Old 10-Mar-2006, 11:57
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Re: Can not display bmp in my picture control

I'm not 100% sure, but do you possibly need to call UpdateData() to update the dialog?
  #7  
Old 11-Mar-2006, 06:35
katmayes katmayes is offline
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Re: Can not display bmp in my picture control

Well,

i 've seen that on this call :

Code:
CDC_Mem->SelectObject(Cbmp_frame);

i should have an CBitmap pointer...
I 've made this to test:

Code:
CBitmap *pBitmap=CDC_Mem->SelectObject(Cbmp_frame);

But ... pBitmap return value is.... NULL... so there is a real problem here... but why SelectOBject doesn't return a good value... i don't know at all because as seen on my code... Cbmp_frame return a good BItmap image (as i've tested)....so the problem come with CDC_Mem....
  #8  
Old 11-Mar-2006, 07:45
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Re: Can not display bmp in my picture control

I noticed there are two CreateBitmap functions.

One returns BOOL (from the CBitmap class), and
the other (a GDI function) returns a handle to the bitmap.

Since you call the CBitmap version, the MSDN says that operator HBITMAP() must be called to get the handle from CBitmap class.

Here's the MSDN text:
Quote:
MFC Library Reference
CBitmap:: operator HBITMAP

Use this operator to get the attached Windows GDI handle of the
CBitmap object.

operator HBITMAP( ) const;
(I found this info here: http://msdn2.microsoft.com/en-us/lib.../25kc2k5s.aspx )

See if this possibly helps.

Also, this might be easier...
I see that you pre-save the image to file: "C:\\toto.bmp"

instead of all this: ( after is_SaveImageMem() )
CPP / C++ / C Code:
Cbmp_frame->CreateBitmap(Falconscr->GetWidth(),Falconscr->GetHeight(),1,3,imgBuffer);
CDC_Mem->SelectObject(Cbmp_frame);
m_VideoNotModifiedDC->BitBlt(0,0,Falconscr->GetWidth(),Falconscr->GetHeight(),CDC_Mem,0,0,SRCCOPY);
Cbmp_frame->DeleteObject();

why not just
CPP / C++ / C Code:
m_VideoNotModifed.LoadBitmap( "C:\\toto.bmp" );

// or: m_VideoNotModifedDC.LoadBitmap( "C:\\toto.bmp" );

I'm not sure what the difference is between your m_VideoNotModified and m_VideoNotModifiedDC variables.
  #9  
Old 12-Mar-2006, 07:53
katmayes katmayes is offline
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Re: Can not display bmp in my picture control

Well, the line where i save the bitmap file was just for a test in fact...
And i can't use it for my application because it's for high security...
m_VideoNotModifiedDC is just the DC pointer to m_VideoNotModified
  #10  
Old 13-Mar-2006, 08:12
Dominic Dominic is offline
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Re: Can not display bmp in my picture control

If you are still having trouble, I learnt this from a previous posting:

Just a thought, but are you using Invadate() to cause the next update, and if so, you may need code something like this :
CPP / C++ / C Code:
	CRgn Region; 
	Region.CreateRectRgnIndirect(&ImagePosition);
	Display::InvalidateRgn(&Region,FALSE );

where ImagePosition is a rectangle of where you want to put the image, and the InvalidateRgn() function will cause the frame to process the OnPaint() function. Display is my class, based on CFrameWnd ( Display : public CFrameWnd) which has an OnPaint function that will be called when the region is invalidated.


Now in the OnPaint() function you need to perform your BitBlt, like so:
CPP / C++ / C Code:
	CPaintDC dc(this); // device context for painting
	int y = dc.BitBlt(	.... )

Thus it is the DC of the OnPaint() function of the instance of the window which is being used and not one that was created at initialisation.

Hope this might help. I will try to dig out the previous post that gave a good example of how to do this.


Here are the limks i used. If it works for you, then we have Paramesh to thank again.
hi...
you can find more information by visiting this link

http://www.functionx.com/visualc/gdi/displaybitmap.htm

or

http://cma.zdnet.com/book/visualc/ch15/ch15.htm
 
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