Saving bmps#2

This is a discussion on Saving bmps#2 within the Windows Programming forums, part of the Platform Specific Boards category; Hi My program gets a screen cap and displays that image on it's main dialog window. Then it lets the ...

  1. #1
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    Saving bmps#2

    Hi
    My program gets a screen cap and displays that image on it's main dialog window. Then it lets the user to crop the image by drawing a square on the image. After the user releases the mouse after cropping, a child dialog window is opened to display the cropped image. Now i want to save this cropped image into the hard disk. i checked out the msdn article: Storing an Image and used the 2 functions found there to do this. Below is how i call those 2 function within the WM_LBUTTONUP msg handler of my main windows's dlgproc (the dlg that displays the uncropped screen cap).

    Code:
    case WM_LBUTTONUP:
    		//user releases the mouse ending the crop
    		if(bCrop)
    		{
    			//get ending mouse coords
    			iEndXPos = GET_X_LPARAM(lParam); 
    			iEndYPos = GET_Y_LPARAM(lParam); 
    			
    			HWND hwndTempCap = CreateDialog(hInst,MAKEINTRESOURCE(IDD_TEMPCAP),NULL,DlgProcTempCap); //open the child dlg which should display the croped img
    			ShowWindow(hwndTempCap,SW_MAXIMIZE);
    
    			g_hTempMemDC = GetDC(hwndTempCap); //get the dc for the child dlg
    			BitBlt(g_hTempMemDC,0,0,iEndXPos-iStartXPos,iEndYPos-iStartYPos,
    				g_hMemDC,iStartXPos,iStartYPos,SRCCOPY); //copy the croped bitmap into the child dialogs' hdc
    
    			HBITMAP hbitmap = CreateCompatibleBitmap(g_hTempMemDC,200,200); // create a bmp for the child dlg
    			if(hbitmap==NULL)
    				PostQuitMessage(0);
    			PBITMAPINFO bmpinfo = CreateBitmapInfoStruct(hwnd, hbitmap); // msdn function - initialize members within a BITMAPINFOHEADER structure
    			CreateBMPFile(hwnd,"test.bmp",bmpinfo,hbitmap,g_hTempMemDC); // msdn function - save the croped img to disk
    
    			bCrop=FALSE;
    		}
    		break;
    But after CreateBMPFile executes, what i get is a blank bitmap ("test.bmp") on the hard disk. CreateBitmapInfoStruct() and CreateBMPFile() cannot go wrong because i found them in msdn, so it's me somthing doing wrong. what's i'm doing wrong plase? Please help.
    Thanks.
    Last edited by geek@02; 10-16-2006 at 09:52 PM.
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  2. #2
    Registered User Tonto's Avatar
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    Several things wrong. Very similar to a problem I had. Use this 'screenshot' function (thx to anonytmouse).

    Code:
    http://cboard.cprogramming.com/showthread.php?t=66259

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