[Mono-bugs] [Bug 80786][Maj] New - Saving Image to MemoryStream faills

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Changed by levap at bansky.net.

http://bugzilla.ximian.com/show_bug.cgi?id=80786

--- shadow/80786	2007-02-10 14:26:10.000000000 -0500
+++ shadow/80786.tmp.27756	2007-02-10 14:26:10.000000000 -0500
@@ -0,0 +1,87 @@
+Bug#: 80786
+Product: Mono: Class Libraries
+Version: 1.2
+OS: 
+OS Details: Windows XP SP 2 Czech
+Status: NEW   
+Resolution: 
+Severity: 
+Priority: Major
+Component: Sys.Drawing.
+AssignedTo: mono-bugs at ximian.com                            
+ReportedBy: levap at bansky.net               
+QAContact: mono-bugs at ximian.com
+TargetMilestone: ---
+URL: 
+Cc: 
+Summary: Saving Image to MemoryStream faills
+
+Description of Problem:
+Saving System.Drawing.Image into MemoryStream throws exception.
+
+
+Steps to reproduce the problem:
+1. Create object of Image type
+2. Create MemoryStream
+3. Call Save method on Image which saves image to stream
+
+Actual Results:
+
+Unhandled Exception: System.ArgumentNullException: Argument cannot be null.
+  at (wrapper managed-to-native)
+System.Drawing.GDIPlus:GdipSaveImageToStream
+(System.Runtime.InteropServices.HandleRef,
+System.Runtime.InteropServices.UCOMIStream,System.Guid&,System.Runtime.InteropServices.HandleRef)
+  at System.Drawing.Image.Save (System.IO.Stream stream,
+System.Drawing.Imaging.ImageCodecInfo encoder, System.Drawing.I
+maging.EncoderParameters encoderParams) [0x00000]
+  at System.Drawing.Image.Save (System.IO.Stream stream,
+System.Drawing.Imaging.ImageFormat format) [0x00000]
+  at (wrapper remoting-invoke-with-check) System.Drawing.Image:Save
+(System.IO.Stream,System.Drawing.Imaging.ImageFormat
+)
+  at ImageSerialize.MainClass.ImageToString (System.Drawing.Image img)
+[0x00000]
+  at ImageSerialize.MainClass.Main (System.String[] args) [0x00000]
+
+
+Expected Results:
+Not to crash :)
+
+How often does this happen? 
+Everytime
+
+Additional Information:
+Sample application
+
+using System;
+using System.Drawing;
+using System.Drawing.Imaging;
+using System.IO;
+
+namespace ImageSerialize
+{
+	class MainClass
+	{				
+		
+		// Returns given image as base64 string. 
+		public static string ImageToString(Image img)
+		{						
+			MemoryStream stream = new MemoryStream();		
+			img.Save(stream, ImageFormat.Png);
+			stream.Position = 0;
+			int LengthOfBuffer = (int) stream.Length;
+			byte[] buff = new byte[LengthOfBuffer];
+			stream.Read(buff, 0, LengthOfBuffer);
+			return(Convert.ToBase64String(buff));
+		}		
+		
+		public static void Main(string[] args)		
+		{
+			Image img = Image.FromFile(@"C:\someimage.png");
+			string smg = ImageToString(img);
+			
+			Console.WriteLine(smg);
+		}
+	}
+}