Re: [Mono-list] Can't get a simple shared object to be used - DllNotFoundException
Thanks for all of your replies. Unfortunately I've already tried most of what was suggested, except modifying LD_LIBRARY_PATH. The only resource that my shared object is using is stdio.h, do I need to add the path of that? I've managed to take a screenshot from the machine which hopefully shows more of what's going on. It's a bit messy unfortunately: http://mono.1490590.n4.nabble.com/file/n4660340/Screenshot_from_2013-07-31_08_49_18.png Bottom right terminal - shows the contents of test.c, and it being compiled to libshared.so. Also shows that libshared.so and Test2.exe are in the same directory. Bottom left window - shows the DLLNotFoundException. Top right window - the output from the c# program Main window - the code executing in MonoDevelop. Thanks, Thomas -- View this message in context: http://mono.1490590.n4.nabble.com/Can-t-get-a-simple-shared-object-to-be-used-DllNotFoundException-tp4660332p4660340.html Sent from the Mono - General mailing list archive at Nabble.com. ___ Mono-list maillist - Mono-list@lists.ximian.com http://lists.ximian.com/mailman/listinfo/mono-list
Re: [Mono-list] Can't get a simple shared object to be used - DllNotFoundException
Also, running with MONO_DEBUG_LEVEL=debug outputs a lot, but this seems like the relevant part: Somehow it's looking right at the file and deciding that it's not there, which is what led me to believe that it might be a platform problem, but as I said, compiling the shared object to 32bit instead of 64bit made no difference :( -- View this message in context: http://mono.1490590.n4.nabble.com/Can-t-get-a-simple-shared-object-to-be-used-DllNotFoundException-tp4660332p4660341.html Sent from the Mono - General mailing list archive at Nabble.com. ___ Mono-list maillist - Mono-list@lists.ximian.com http://lists.ximian.com/mailman/listinfo/mono-list
[Mono-list] Can't get a simple shared object to be used - DllNotFoundException
Hi, I'm trying to get my head around making use of Linux shared object files. I have created a basic C-based shared object which prints (Shared Object Called) when main() is called. Compiled it in gcc with -fPIC and got libshared.so as an output. Go into C#, add [DllImport(libshared.so)] public static extern int main(); Call main(), get a DllNotFoundException. libshared.so is in the same directory as the c# program. I thought it might be a platform problem (I'm using 64 bit fedora 18, and 64 bit mono 3.20), but I've tried building the shared object with both -m32 and -m64 arguments, with no luck. I can provide code if it helps, but the machine that I'm building is a corporate machine that isn't allowed on the internet, so I'll have to copy it out line-by-line. Thanks, Thomas -- View this message in context: http://mono.1490590.n4.nabble.com/Can-t-get-a-simple-shared-object-to-be-used-DllNotFoundException-tp4660332.html Sent from the Mono - General mailing list archive at Nabble.com. ___ Mono-list maillist - Mono-list@lists.ximian.com http://lists.ximian.com/mailman/listinfo/mono-list
Re: [Mono-list] Can't get a simple shared object to be used - DllNotFoundException
Here we go, I was on my nexus yesterday so couldnt easily grab these: http://www.mono-project.com/Interop_with_Native_Libraries http://www.mono-project.com/DllNotFoundException http://www.mono-project.com/Config_DllMap Ian On 31 July 2013 03:33, Jonathan Pryor jonpr...@vt.edu wrote: On Jul 30, 2013, at 5:34 PM, Stifu st...@free.fr wrote: I've never done that myself, but if I remember correctly, you're not supposed to add the .so part. Just do [DllImport(libshared)]. Close; you should prefer [DllImport(shared)], with one exception. On Windows, this will try to load SHARED.DLL, on Linux it will load libshared.so, and on OS X it will load libshared.dylib. The exception is that if the library name contains a '.', Windows LoadLibrary() will not automatically append a .DLL extension, so this would always fail: [DllImport(gtksharp-2.0)] In these cases, you should use the full Windows filename, and provide a .dll.config file so that the file can be found on other platforms: [DllImport(libgtksharp-2.0.dll)] - Jon ___ Mono-list maillist - Mono-list@lists.ximian.com http://lists.ximian.com/mailman/listinfo/mono-list ___ Mono-list maillist - Mono-list@lists.ximian.com http://lists.ximian.com/mailman/listinfo/mono-list
Re: [Mono-list] Can't get a simple shared object to be used - DllNotFoundException
I've never done that myself, but if I remember correctly, you're not supposed to add the .so part. Just do [DllImport(libshared)]. That way, it's up to the framework to figure out the right extension depending on the OS it runs on. In other words, that'd mean it can't find your file because it's looking for libshared.so.so. thomasw234 wrote Hi, I'm trying to get my head around making use of Linux shared object files. I have created a basic C-based shared object which prints (Shared Object Called) when main() is called. Compiled it in gcc with -fPIC and got libshared.so as an output. Go into C#, add [DllImport(libshared.so)] public static extern int main(); Call main(), get a DllNotFoundException. libshared.so is in the same directory as the c# program. I thought it might be a platform problem (I'm using 64 bit fedora 18, and 64 bit mono 3.20), but I've tried building the shared object with both -m32 and -m64 arguments, with no luck. I can provide code if it helps, but the machine that I'm building is a corporate machine that isn't allowed on the internet, so I'll have to copy it out line-by-line. Thanks, Thomas -- View this message in context: http://mono.1490590.n4.nabble.com/Can-t-get-a-simple-shared-object-to-be-used-DllNotFoundException-tp4660332p4660334.html Sent from the Mono - General mailing list archive at Nabble.com. ___ Mono-list maillist - Mono-list@lists.ximian.com http://lists.ximian.com/mailman/listinfo/mono-list
Re: [Mono-list] Can't get a simple shared object to be used - DllNotFoundException
Dllimport tells the loader the library name. A large combination of things work as library loading and shared objects differ greatly on windows and unix. On windows, the library could be installed in the side-by-side cache or in the same folder as your assembly etc. If you have a file called libfoo.so then best practice would be to do DllImport(foo) If that still doesn't work then you may actually be missing a library required by foo and may need to set LD_LIBRARY_PATH or the equivalent on your platform. You might also need to mess with dllmap config files too On 30 Jul 2013 22:35, Stifu st...@free.fr wrote: I've never done that myself, but if I remember correctly, you're not supposed to add the .so part. Just do [DllImport(libshared)]. That way, it's up to the framework to figure out the right extension depending on the OS it runs on. In other words, that'd mean it can't find your file because it's looking for libshared.so.so. thomasw234 wrote Hi, I'm trying to get my head around making use of Linux shared object files. I have created a basic C-based shared object which prints (Shared Object Called) when main() is called. Compiled it in gcc with -fPIC and got libshared.so as an output. Go into C#, add [DllImport(libshared.so)] public static extern int main(); Call main(), get a DllNotFoundException. libshared.so is in the same directory as the c# program. I thought it might be a platform problem (I'm using 64 bit fedora 18, and 64 bit mono 3.20), but I've tried building the shared object with both -m32 and -m64 arguments, with no luck. I can provide code if it helps, but the machine that I'm building is a corporate machine that isn't allowed on the internet, so I'll have to copy it out line-by-line. Thanks, Thomas -- View this message in context: http://mono.1490590.n4.nabble.com/Can-t-get-a-simple-shared-object-to-be-used-DllNotFoundException-tp4660332p4660334.html Sent from the Mono - General mailing list archive at Nabble.com. ___ Mono-list maillist - Mono-list@lists.ximian.com http://lists.ximian.com/mailman/listinfo/mono-list ___ Mono-list maillist - Mono-list@lists.ximian.com http://lists.ximian.com/mailman/listinfo/mono-list
Re: [Mono-list] Can't get a simple shared object to be used - DllNotFoundException
On Jul 30, 2013, at 5:34 PM, Stifu st...@free.fr wrote: I've never done that myself, but if I remember correctly, you're not supposed to add the .so part. Just do [DllImport(libshared)]. Close; you should prefer [DllImport(shared)], with one exception. On Windows, this will try to load SHARED.DLL, on Linux it will load libshared.so, and on OS X it will load libshared.dylib. The exception is that if the library name contains a '.', Windows LoadLibrary() will not automatically append a .DLL extension, so this would always fail: [DllImport(gtksharp-2.0)] In these cases, you should use the full Windows filename, and provide a .dll.config file so that the file can be found on other platforms: [DllImport(libgtksharp-2.0.dll)] - Jon ___ Mono-list maillist - Mono-list@lists.ximian.com http://lists.ximian.com/mailman/listinfo/mono-list
