[Mono-aspnet-list] GDI+ status: InvalidParameter on a WebService Method

BadStorm mailinglist at slashweb.it
Fri Sep 14 20:20:44 UTC 2012

I'm developing a web service in mono, and I have a little problem with one function:

One of my methods return an image. To do so I get data from the database  and I do the following for convert it in base64 string:

MemoryStream ms = new MemoryStream(club_logo);
System.Drawing.Image myImage = System.Drawing.Image.FromStream(ms);

using (MemoryStream ms2 = new MemoryStream())
	// Convert Image to byte[]
	myImage.Save(ms, System.Drawing.Imaging.ImageFormat.Png);
	byte[] imageBytes = ms2.ToArray();
	// Convert byte[] to Base64 String
	string base64String = Convert.ToBase64String(imageBytes);
	return base64String;

But I get this exception on this line "System.Drawing.Image myImage = System.Drawing.Image.FromStream(ms);" :

System.ArgumentException: A null reference or invalid value was found [GDI+ status: InvalidParameter]
at System.Drawing.GDIPlus.CheckStatus (Status status) [0x00000] in <filename unknown>:0 

What does it means?

I used MonoDevelop 3 on MacOsX and I deployed it on an Ubuntu Server 12.04 whit Mono


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