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Dynamically generating images in ISAPI extension using GDI+ with live demo

, 3 Oct 2002
A class wrapper to write GDI+ images to the client browser using an ISAPI extension.
#include "StdAfx.h"
#include "gdipexample.h"
#include "GDIpISAPI.h"

void CGdipExample::SetSize(int iWidth,int iHeight)
{
	m_size = CSize( __max( 1, __min( 1024, iWidth)), __max( 1, __min( 1024, iHeight)) );  
}


void CGdipExample::DrawStuff(Gdiplus::Image& image)
{
	using namespace Gdiplus;
	USES_CONVERSION;
	CString str,str2;


	if (!m_pServer || !m_pCtxt)
		return;

	DWORD dwBuffer=1024;
	int w=image.GetWidth();
	int h= image.GetHeight();

	Graphics graphics(&image);

	// Create a Pen object.
	LinearGradientBrush white(
		Point(0, 0),	
		Point(w,h),
		Color(255, 255, 255),   // opaque red
		Color(220, 220, 220));  // opaque blue
	LinearGradientBrush redyellow(
		Point(0, 0),	
		Point(w,h),
		Color(0,0,255,0),   // opaque red
		Color(200, 255, 255,0));  // opaque blue

	SolidBrush blue(Color(0, 0, 50));
	Pen black(Color(0, 0, 0), 3);
	FontFamily  fontFamily(L"Tahoma");
	Font        font(&fontFamily, 14, FontStyleRegular, UnitPixel);

	graphics.FillRectangle(&white, 0,0,w, h);
	graphics.FillRectangle(&redyellow, 5,5,50, h-10);
	graphics.DrawRectangle(&black, 5,5,w-10, h-10);

	str+="This image has been generated by GDI+ (on the server)\r\n and sent to your browser using an ISAPI extension.\r\n\r\n";
	str+="Time/Date: "; str+=CTime::GetCurrentTime().Format("%b-%d-%Y, %H:%M:%S"); str+="\r\n";
	m_pCtxt->GetServerVariable(_T("REMOTE_HOST"), str2.GetBufferSetLength(dwBuffer), &dwBuffer);
	str2.ReleaseBuffer();
	str+="Client adress: "; str+=str2; str+="\r\n";
	str+="Type: "; str+=m_sImageType; str+="\r\n";
	str2.Format("%dx%d",w, h);
	str+="Size (pixels): "; str+=str2; str+="\r\n";
	str+="Method: "; str+=m_pCtxt->m_pECB->lpszMethod; str+="\r\n";
	str+="Coded by Jonathan de Halleux, dehalleux@auto.ucl.ac.be\r\n";
	LPWSTR lpwz = A2W(str);
	graphics.DrawString(lpwz, -1, &font, PointF((REAL)30, (REAL)30), &blue);
	graphics.Flush(  FlushIntentionFlush);
}


void CGdipExample::Render()
{
	CSingleLock lock(&m_mutex);
	lock.Lock();
	if (lock.IsLocked())
	{
		Gdiplus::Bitmap bitmap(m_size.cx, m_size.cy);

		DrawStuff(bitmap);
	
		CGDIpISAPI gdip(m_pServer, m_pCtxt, &bitmap);
	
		m_sImageType.MakeLower();
		if (m_sImageType=="jpeg" || m_sImageType=="jpg")
			gdip.SetImageType(CGDIpISAPI::ImageJPEG);
		else if (m_sImageType=="bmp")
			gdip.SetImageType(CGDIpISAPI::ImageBMP);
		else
			gdip.SetImageType(CGDIpISAPI::ImagePNG);
	
		gdip.WriteImage();
		
		lock.Unlock();
	}
}

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About the Author

Jonathan de Halleux
Engineer
United States United States
Jonathan de Halleux is Civil Engineer in Applied Mathematics. He finished his PhD in 2004 in the rainy country of Belgium. After 2 years in the Common Language Runtime (i.e. .net), he is now working at Microsoft Research on Pex (http://research.microsoft.com/pex).

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