Png image Dynamic creation.

Dear Sir,

I stand by my original response, use the Graphics::Graphics class, and the draw methods (DrawString, DrawImage, et cetera) in the gdiplus.h file. Let me know if you have problems...see this[^] page, too. Get past all the crap about the library version stuff and how they're exported. Read starting one paragraph before
A Basic GDI+ Application
Good luck.
Aaron
ProCure

Thanks for your intrest to my problem.
I've changed the work method and I've used this function

void CWWizard::CreateBMPFile(HWND hwnd, LPTSTR pszFile, std::vector<CString> bmpListBmp, HDC hDC) //PBITMAPINFO pbi, HBITMAP hBMP
 { 
    HANDLE hf;                 // file handle  
    BITMAPFILEHEADER hdr;       // bitmap file-header  
    PBITMAPINFOHEADER pbih;     // bitmap info-header  
    LPBYTE lpBits;              // memory pointer  
    DWORD dwTotal;              // total count of bytes  
    DWORD cb;                   // incremental count of bytes  
    BYTE *hp;                   // byte pointer  
    DWORD dwTmp; 

	if((int)bmpListBmp.size() > 0)
	{
		// si liste contient des elements --> Create the .PNG file.  
		hf = CreateFile(pszFile, 
                   GENERIC_READ | GENERIC_WRITE, 
                   (DWORD) 0, 
                    NULL, 
                   CREATE_ALWAYS, 
                   FILE_ATTRIBUTE_NORMAL, 
                   (HANDLE) NULL); 

		if (hf == INVALID_HANDLE_VALUE) 
			errhandler("CreateFile", hwnd); 

		hdr.bfType = 0x4d42;        // 0x42 = "B" 0x4d = "M"  

		for(int nIdImg = 0; nIdImg < (int)bmpListBmp.size(); nIdImg++)
		{
			//recuperer le hBITMAP et le hederindo de chq image
			HBITMAP hBMP = GetBmpUnifie(bmpListBmp[nIdImg], m_BrosseFondWizard);
			PBITMAPINFO pbi = CreateBitmapInfoStruct(this->m_hWnd, hBMP);

			pbih = (PBITMAPINFOHEADER) pbi; 
			lpBits = (LPBYTE) GlobalAlloc(GMEM_FIXED, pbih->biSizeImage);

			if (!lpBits) 
				errhandler("GlobalAlloc", hwnd); 

			// Retrieve the color table (RGBQUAD array) and the bits  
			// (array of palette indices) from the DIB.  
			if (!GetDIBits(hDC, hBMP, 0, (WORD) pbih->biHeight, lpBits, pbi, DIB_RGB_COLORS)) 
			{
				errhandler("GetDIBits", hwnd); 
			}

			// Compute the size of the entire file.  
			hdr.bfSize = (DWORD) (sizeof(BITMAPFILEHEADER) + 
						 pbih->biSize + pbih->biClrUsed 
						 * sizeof(RGBQUAD) + pbih->biSizeImage); 

			// Compute the offset to the array of color indices.  
			hdr.bfOffBits += (DWORD) sizeof(BITMAPFILEHEADER) + 
						pbih->biSize + pbih->biClrUsed 
						* sizeof (RGBQUAD); 
		
			hdr.bfReserved1 = 0; 
			hdr.bfReserved2 = 0; 

			// Copy the BITMAPFILEHEADER into the .BMP file.  
			if (!WriteFile(hf, (LPVOID) &hdr, sizeof(BITMAPFILEHEADER), (LPDWORD) &dwTmp,  NULL)) 
			{
				errhandler("WriteFile", hwnd); 
			}

		
			//recuperer le hBITMAP et le hederindo de chq image
			HBITMAP hBMP = GetBmpUnifie(bmpListBmp[nIdImg], m_BrosseFondWizard);
			PBITMAPINFO pbi = CreateBitmapInfoStruct(this->m_hWnd, hBMP);

			pbih = (PBITMAPINFOHEADER) pbi; 
			lpBits = (LPBYTE) GlobalAlloc(GMEM_FIXED, pbih->biSizeImage);

			// Copy the BITMAPINFOHEADER and RGBQUAD array into the file.  
			if (!WriteFile(hf, (LPVOID) pbih, sizeof(BITMAPINFOHEADER) 
						  + pbih->biClrUsed * sizeof (RGBQUAD), 
						  (LPDWORD) &dwTmp, ( NULL)))
				errhandler("WriteFile", hwnd); 

			// Copy the array of color indices into the .BMP file.  
			dwTotal = cb = pbih->biSizeImage; 
			hp = lpBits; 
			if (!WriteFile(hf, (LPSTR) hp, (int) cb, (LPDWORD) &dwTmp,NULL)) 
				   errhandler("WriteFile", hwnd); 
		}//fin for
		 
		// Close the .BMP file.  
		if (!CloseHandle(hf)) 
           errhandler("CloseHandle", hwnd); 

		// Free memory.  
		GlobalFree((HGLOBAL)lpBits);
	}  
}

The problem is that only image file displayed. Normaly there's 3 !.
I know I missing something but I don't know where.
Can you help tell me where I'm wrong.
Many thanks again for your help.
Best Regards.
Mourad.

For information, I've tried this function

void CWWizard::SaveFile(HDC hdc)
{

	HDC hCompatibleDC = ::CreateCompatibleDC(hdc);

	Gdiplus::Graphics graphics(hCompatibleDC);

	// Create an Image object based on a PNG file. 
	Gdiplus::Image image3(L"D://mehdy//carre.png"); 

	// Create an Image object based on a PNG file. 
	Gdiplus::Image image2(L"D://mehdy//guitare.png"); 

	// Draw the image. 
	graphics.DrawImage(&image3, 0, 0); 

	// Draw the image. 
	graphics.DrawImage(&image2, 0,10); 

	HBITMAP hBmp = HDCtoHBITMAP(hCompatibleDC,350,350);
 
	// *Save* the altered image. 
	CLSID pngClsid; 
	GetEncoderClsid(L"image/png",&pngClsid); 
	//image3.Save(L"D://mehdy//Mosaic2.png",&pngClsid, NULL); 

	 Gdiplus::Bitmap image ((HBITMAP)hBmp, (HPALETTE)0);

	//Gdiplus::Bitmap image = hOldSrcBmp;
	 image.Save(L"D://mehdy//Sortie.png",&pngClsid, NULL);

	 RedrawWindow();

	
}

But, the problem is that I must use a virtual HDC not a HDC of the dialog.
I hope this can clarify the problem.
Thanks again.
Best regards.
Mourad

Many thanks for replying.
First, I'm using native C++.
What I want to do is displying the final results of my program in an image.
This image will diplay every result as a bitmap (png image).
Sothat, I've to to draw a global image (witch contains all results) and attach to this image some other images who represent evenryone a single result).
I know it is not simple to understand by I hope this can clarify the problem.
Many thanks for helping.
Best regards.