Handling Corrupted JPEGs in C#
- by ddango
We have a process that pulls images from a remote server. Most of the time, we're good to go, the images are valid, we don't timeout, etc. However, every once and awhile we see this error similar to this:
Unhandled Exception: System.Runtime.InteropServices.ExternalException: A generic
error occurred in GDI+.
at System.Drawing.Image.Save(Stream stream, ImageCodecInfo encoder, EncoderPa
rameters encoderParams)
at ConsoleApplication1.Program.Main(String[] args) in C:\images\ConsoleApplic
ation1\ConsoleApplication1\Program.cs:line 24
After not being able to reproduce it locally, we looked closer at the image, and realized that there were artifacts, making us suspect corruption.
Created an ugly little unit test with only the image in question, and was unable to reproduce the error on Windows 7 as was expected. But after running our unit test on Windows Server 2008, we see this error every time.
Is there a way to specify non-strictness for jpegs when writing them? Some sort of check/fix we can use?
Unit test snippet:
var r = ReadFile("C:\\images\\ConsoleApplication1\\test.jpg");
using (var imgStream = new MemoryStream(r))
{
using (var ms = new MemoryStream())
{
var guid = Guid.NewGuid();
var fileName = "C:\\images\\ConsoleApplication1\\t" + guid + ".jpg";
Image.FromStream(imgStream).Save(ms, ImageFormat.Jpeg);
using (FileStream fs = File.Create(fileName))
{
fs.Write(ms.GetBuffer(), 0, ms.GetBuffer().Length);
}
}
}
