C# – Outputting image to response output stream giving GDI+ error

When outputting an image to the output stream, does it require temporary storage? I get the “generic GDI+” error that is usually associated with folder permission error when saving an image to file.

The only thing I’m doing to the image is adding some text. I still get the error even when I output the image straight without modifications. For example, doing this will give me the error:

using (Bitmap image = new Bitmap(context.Server.MapPath("images/stars_5.png")))
{
    image.Save(context.Response.OutputStream, System.Drawing.Imaging.ImageFormat.Png);
}

Everything works fine on my local machine running Windows 7 with IIS 7.5 and ASP.NET 2.0. The problem is occurring on the QA server which is running Windows Server 2003 with IIS 6 and ASP.NET 2.0.

The line that’s giving the error is:

image.Save(context.Response.OutputStream, System.Drawing.Imaging.ImageFormat.Png);

Here’s the stack trace:

[ExternalException (0x80004005): A generic error occurred in GDI+.]
   System.Drawing.Image.Save(Stream stream, ImageCodecInfo encoder, EncoderParameters encoderParams) +378002
   System.Drawing.Image.Save(Stream stream, ImageFormat format) +36
   GetRating.ProcessRequest(HttpContext context) in d:inetpubwwwrootSymInfoQAAppstoolsRatingGetRating.ashx:54
   System.Web.CallHandlerExecutionStep.System.Web.HttpApplication.IExecutionStep.Execute() +181
   System.Web.HttpApplication.ExecuteStep(IExecutionStep step, Boolean& completedSynchronously) +75

Contents hide

Answers:

Method 1

Method 2

Answers:

Thank you for visiting the Q&A section on Magenaut. Please note that all the answers may not help you solve the issue immediately. So please treat them as advisements. If you found the post helpful (or not), leave a comment & I’ll get back to you as soon as possible.

Method 1

PNGs (and other formats) need to be saved to a seekable stream. Using an intermediate MemoryStream will do the trick:

using (Bitmap image = new Bitmap(context.Server.MapPath("images/stars_5.png")))
{
   using(MemoryStream ms = new MemoryStream())
   {
      image.Save(ms, System.Drawing.Imaging.ImageFormat.Png);
      ms.WriteTo(context.Response.OutputStream);
   }
}

Method 2

I just would add:

Response.ContentType = "image/png";

So it can be viewed directly in the browser when it isn’t within an img tag.

All methods was sourced from stackoverflow.com or stackexchange.com, is licensed under cc by-sa 2.5, cc by-sa 3.0 and cc by-sa 4.0

0 0 votes

Article Rating