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3.8

How Display bitmap data (a variable, not a file) into a Picture Box with MFC or WIN32 ?

Asked by Develprog in Windows MFC Programming, Windows Programming, C++ Programming Language

Hello,
Here is my first post, so I made an application using HBITMAP with the LoadImage method () on a bmp file. But this time I would load an image, not from a file (code below) but using data in memory (see comments).

My program works like a wrapper class by calling a main class named Camdev , this class saves a bitmap file on disk -and my application used HBITMAP LoadImage() to display each image from the camera in the Picture box.
I used the code bellow and that works perfect.

But the Camdev class also has a method that saves in memory (SaveToMem ()). I don't want to save the file on disk, so I 'll save the bitmap in a memory buffer then how do it I heard about using LoadImage with parameter LR_CREATEDIBSECTION but how implement that ?

The MFC LoadBitmap() function does only load bitmaps from resource in VC++ so I decided to use LoadImage() but I don't know how?

How do I pass the bitmap data buffer so my fonctions GetcaptureImage () and DisplayImage () use this data properly with MFC or Win API methods ?

Thank you

Here's the code:

Get your answer NOW

         
           
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             //Capture Image from file (loadimage)
//
#include "stdafx.h"
 
#include "Cam_conf.h"
#include "Cam_confDlg.h"
 
 
HWND hwnd   = NULL;
 
Camdev cp;  //class
 
HBITMAP eventsavedlgdc = (HBITMAP)::LoadImage(NULL,"readframes01.bmp",IMAGE_BITMAP,0,0,LR_LOADFROMFILE);
HDC           hMemDC;
RECT rectScaled;
int rectW;
int rectH;
 
 
 
 
void CAboutDlg::OnPaint()
{
   CPaintDC dc(this); // device context for painting
 
   CRect rc( 0, 0, 4, 8 );
 
   MapDialogRect( &rc );
   int baseUnitY = rc.bottom;
   int baseUnitX = rc.right;
   TRACE("baseUnitX = %d\n", baseUnitX);
   TRACE("baseUnitY = %d\n", baseUnitY);
   TRACE("Dans OnPaint\n"); //ajout
}
 
 
CCam_confDlg::~CCam_confDlg() //
{
 
	if (m_Picture)::DeleteObject(m_Picture);
	if (Bmp4.m_hObject)::DeleteObject(Bmp4.m_hObject);
	m_Font.DeleteObject();
	cp.StopCapture();
	cp.SaveSettingsToFile();// 
 
}
 
 
BOOL CCam_confDlg::OnInitDialog()
{
	//Set the icon for this dialog.  The framework does this automatically
	//when the application's main window is not a dialog
	SetIcon(m_hIcon, TRUE);	//Set big icon
	SetIcon(m_hIcon, FALSE);//Set small icon
 
	//dimensions of the control
	m_Picture.GetWindowRect(&rectScaled);
	rectW=rectScaled.right-rectScaled.left;
	rectH=rectScaled.bottom-rectScaled.top;
	
	store=cp.Init(Gl_ip);  // utiliser l'addresse IP de l'argument
	
	SetTimer(ID_TIMER1, 90, 0);				
}
 
void CCam_confDlg::OnTimer(UINT nIDEvent) 
{
		
	CDialog::OnTimer(nIDEvent);
 
	     if (nIDEvent ==ID_TIMER1) 
		{
			TRACE("ON_TIMER_IN\n");
			UpdateData(TRUE);
 
			//KillTimer(1);
			KillTimer(ID_TIMER1);
	
			//MUTEX			
			if(!GetCaptureImage())
			{
				cm_display.Lock();	//Mutex
				if(!DisplayImage())	;				
				cm_display.Unlock();//Mutex	
			}
			SetTimer(ID_TIMER1,10,0);	
			UpdateData(FALSE);
		}		
}
 
 
			
bool CCam_confDlg::GetCaptureImage()
{
	if(!cp.GetCaptureInfo(&status, &newestframeix, &newesttimems,
						&nframes, &nprocbufs, &nusable, &nlocked, lockitems, &nlockitems))
				{	
					gx_geterror(&ecode, ebuf, sizeof(ebuf));
					return TRUE;
				}
				
	// Lock frame
	if(!cp.LockFrames(FXCAM_LOCK_RELEASE_ALL_OTHER, frame, frame)) 
	{  
		// Error occurred
		return TRUE;
	}
	
	// Read frame
	if(!cp.ReadFrame(FXCAM_READFRAME_AUTOADJUST, 0, frame, NULL, &frametimems, &newestframeix, NULL, cp.image)) 
			{
				if(nlockitems == 0) 
				{
				// Error occurred
				return TRUE;
				}
			}
			
	// Release the locked frame
	if(!cp.UnlockFrames(0, frame, frame)) 
			{
				// Error occurred
				return TRUE;
			}
		
	//save image		 //Utiliser SavetoMem vers ppm (pour stream),  vers jpg (pour snapshot)
	if(!cp.image.Save("readframes01.bmp", GX_BMP)) 
	{
		gx_geterror(&ecode, ebuf, sizeof(ebuf));
		return TRUE;
	}
	
	capture_ok=true;
	return FALSE;
}
 
bool CCam_confDlg::DisplayImage() 
{
	  capture_ok=false;	
 
	  if (eventsavedlgdc)
	  { 
	    	::DeleteObject(eventsavedlgdc);
	  }
 
	eventsavedlgdc = (HBITMAP)::LoadImage(NULL,"readframes01.bmp",IMAGE_BITMAP,0,0,LR_LOADFROMFILE);//OK
 
	  CBitmap bmp;
	  bmp.Attach(eventsavedlgdc);
	  BITMAP bm;
	  bmp.GetBitmap(&bm);  
	  bmp.Detach(); 
 
	  HDC hdc=::GetDC(m_Picture.m_hWnd);
	  HDC memdc=::CreateCompatibleDC(hdc);
	  HBITMAP hBmp2=(HBITMAP)SelectObject(memdc,eventsavedlgdc);
  
 
	  SetStretchBltMode(hdc,COLORONCOLOR);  //For better quality
      StretchBlt(hdc,0,0,rectW,rectH,memdc,0,0,752,480,SRCCOPY); 
 
      DeleteDC(hdc);
      DeleteDC(memdc);
 
	  if(eventsavedlgdc)
	  {
			m_Picture.SetBitmap(hBmp2);
			DeleteDC(hMemDC);
			DeleteObject(eventsavedlgdc);
	  }
 
	  capture_ok=true;
	  return FALSE;
}
           
         

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How Display bitmap data (a variable, not a file) into a Picture Box with MFC or WIN32 ?

Asked by Develprog in Windows MFC Programming, Windows Programming, C++ Programming Language

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