8000 create dll based on 3rd dll · Issue #93 · 3F/DllExport · GitHub
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guzuomuse opened this issue Feb 12, 2019 · 3 comments
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create dll based on 3rd dll #93

guzuomuse opened this issue Feb 12, 2019 · 3 comments
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@guzuomuse
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i have created a dll with 3rd library: Rabbitmq.Client(.dll)

if a function return something without facilities reference to rabbitmq . everything goes well,but when i use some function from rabbitmq.client.dll; the function can't not run as expect;
example code:

	[return: MarshalAs(UnmanagedType.LPWStr)]
        [DllExport]
        public static string test_string([MarshalAs(UnmanagedType.LPWStr)]string content)
        {
            //var factory = new ConnectionFactory() { HostName = "localhost", UserName = "test", Password = "test" };  // here is the question, if i comment it , it can return content as expect,but uncomment,the exported dll will crash. 
            return content + "----from-c_sharp-----no--problem!";

        }

anybody can give me some tips ,why this occurs? how to solve this? many thanks!
@3F
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3F commented Feb 12, 2019

Similar to #84 (continues #83). Try to debug at runtime. Mixed mode for debugger with attaching to process.

#84 (comment)

your problem may be exactly from logic of using your mentioned "the Neural Networks" library: incorrect initialization, invalid data, or even null and the related unhandled exception from managed side, stack corruption, stack overflow, and lot of other bugs.

@3F 3F added the question label Feb 12, 2019
@3F
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3F commented Feb 12, 2019

Also note, for stack problems you need to check required calling convention and try to start from basic signature without marshaling. Usually, I recommend only IntPtr because of more control. Well, it's my prefer.

But in general, your ConnectionFactory can do anything like "Neural Networks" library from #84.

Also try to isolate or catch something (about exceptions, start here #85). How about to reproduce an invoking from your trivial unmanaged side? C++ complete example see in related repo.

@guzuomuse
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@3F
sorry for late reply.
In my case,after debugging, i found the reason was that i should copy the 3rd dlls to some special place, and the it worked;
thanks for this library man!!!

@3F 3F mentioned this issue Jun 25, 2020
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