Bug 3961 - Error in Icon class causes resgen to create invalid icon resources
Summary: Error in Icon class causes resgen to create invalid icon resources
Status: NEW
Alias: None
Product: Class Libraries
Classification: Mono
Component: System.Drawing ()
Version: master
Hardware: PC Linux
: --- normal
Target Milestone: Untriaged
Assignee: Bugzilla
Depends on:
Reported: 2012-03-18 23:33 UTC by Seth Randall
Modified: 2012-10-11 07:25 UTC (History)
2 users (show)

Is this bug a regression?: ---
Last known good build:

Patch (1.30 KB, patch)
2012-03-18 23:33 UTC, Seth Randall
Test app (135.75 KB, application/zip)
2012-03-18 23:34 UTC, Seth Randall

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Description Seth Randall 2012-03-18 23:33:51 UTC
Created attachment 1533 [details]

resgen uses the Icon.InitFromStreamWithSize method to create a .resource file from a .resx file. If the Icon in the .resx file has a 256x256 PNG icon as one of its parts, the method will strip the PNG out. However, the method doesn't adjust the offsets in the Icon before writing it out. This causes the application to crash when it runs because it looks for the icon data in the wrong place. Attached is a patch to fix the issue and a C# project to test it.

To test error
1. Build the application normally
2. Run
3. Receive an error when trying to load the image with the PNG in it

To test the fix
1. Apply the patch to the current Mono install.
2. Delete the Form1.resources file to force MonoDevelop to rebuild it
3. Build the application normally
4. Run
5. The images should now appear properly regardless of which button is selected
Comment 1 Seth Randall 2012-03-18 23:34:48 UTC
Created attachment 1534 [details]
Test app
Comment 2 Gary____ 2012-10-11 07:25:04 UTC
I think this has been fixed in master.