[Mono-dev] Options needed for imported Linux libraries.
I compiled a C so lib on Linux to do ioctl calls and tried to use it with DllImport but when I pass structures by ref or StringBuilder for returning char* buffers to my library everything is behaving strange. The StringBuilders returned do not contain anything or I have to create a new StringBuilder for any call to unmanged code because they are stuck to the first value returned. The structures contain nonsense data after the second call into the library. What am I missing? How do I compile so libs to be mono friendly? I tried to Marshal my structure to an HGlobal IntPtr as the docs say passing structures by ref to unmanaged code is unsupported (.NET obviously supports this) but that didn't help. I use mono 2.6.7 on openSUSE 11.3. Valgrind doesn't say anything about the functions I call from mono when I run it using a C test program. ___ Mono-devel-list mailing list Mono-devel-list@lists.ximian.com http://lists.ximian.com/mailman/listinfo/mono-devel-list
Re: [Mono-dev] Options needed for imported Linux libraries.
On 12.08.2010 16:49, Omar Siam wrote: What am I missing? How do I compile so libs to be mono friendly? Your post is missing a sample :) Post the p/invoke and structure defs of both sides (managed and unmanaged). Robert ___ Mono-devel-list mailing list Mono-devel-list@lists.ximian.com http://lists.ximian.com/mailman/listinfo/mono-devel-list
Re: [Mono-dev] Options needed for imported Linux libraries.
On Thu, 2010-08-12 at 16:49 +0200, Omar Siam wrote: I compiled a C so lib on Linux to do ioctl calls and tried to use it with DllImport but when I pass structures by ref or StringBuilder for returning char* buffers to my library everything is behaving strange. http://mono-project.com/Dllimport#Classes_and_Structures_as_Return_Values http://mono-project.com/Dllimport#Strings_as_Return_Values In short, don't use StringBuilder as a method return type. Use StringBuilder as a parameter type, and you _may_ need to use the [Out] parameter attribute on the StringBuilder. I tried to Marshal my structure to an HGlobal IntPtr as the docs say passing structures by ref to unmanaged code is unsupported Where do the docs say this? As Robert Jordan mentioned, having the managed and native function signatures would be very helpful. - Jon ___ Mono-devel-list mailing list Mono-devel-list@lists.ximian.com http://lists.ximian.com/mailman/listinfo/mono-devel-list
