DllNotFoundException: libcairo-2.dll

Question

Hi, I had a project working in Unity 3 beta (last tested in beta 7) under Windows 7. I've since changed machine from Win7 32-bit to 64-bit, and also upgraded to Unity 3 RC 2 at the same time. Now my project no longer runs and I'm not sure what's caused it.

The project uses Cairo and Pango -- so I copy Mono.Cairo.dll, pango-sharp.dll and glib-sharp.dll from various places in the Unity exe folder, into my Unity project's Plugins folder. When I call the Cairo.ImageSurface constructor, I get the error DllNotFoundException: libcairo-2.dll.

I've tried copying libcairo-2.dll into my Windows\System32 folder, into the same folder as the Unity exe, into my project's Plugins, Assets and Libraries folders -- all with no effect. How do I get it to work?

Answer 1

Answer by Spotlightor.du · May 15, 2011 at 05:07 PM

I encountered this problem too when I try to load DLL plugin in windows 7 64bit. It's solved by running Unity.exe in "XP Service Pack 3" compatibility mode. You may give it a try: right click "Unity.exe" in your Unity installation folder and enable "compatibility mode".

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Answer 2

Answer by Marzoa · Dec 28, 2012 at 12:41 PM

Same problem in OSX Mountain Lion. Obviously no Windows workaround will work here...

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Answer 3

Answer by clauz · Feb 20, 2013 at 11:23 AM

I think you have to download full gtk-bundle, which contains cairo and so on (http://www.gtk.org/download/win32.php). For Unity mono use !!! 32-bit only !!!
Unzip it to some location, for example /opt/gtk
Add gtk BIN (!) folder to system path (in my case: /opt/gtk/bin)
Try to restart Unity and run scene again

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DllNotFoundException: libcairo-2.dll

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