Want to get string array as output from C Function using marshalling from C#

Question

I have function in C

void GetCharArray(char* arrayNew[5])
{
arrayNew[5]= {"Test", 
            "Test2",
            "Test4",
            "Test5",
            "Test6",        

    };  
}

extern "C" __declspec(dllexport) void GetCharArray(char* arrayNew[5]);

Want to call it from my C# code as following

   [DllImport(@"Test.dll",
        CallingConvention = CallingConvention.Cdecl, CharSet = CharSet.Auto)]       
    public static extern void GetCharArray(String[] sbOut);

 List<string> testList = new List<string>();
 GetCharArray(testList .ToArray());

I want my testList to be populated by values from C code.Am I marshaling it in right way.As when the debugger is reaching GetCharArray() function it is showing no entry point found. Kindly Help.

Are you sure you don't want a char[,] array from your C code? — Bryan Crosby
– Bryan Crosby, Commented Jul 18, 2012 at 14:55
@AlexFarber - Thanks a lot for reply. I am not very good in C programming. I am basically .net guy. Can you please correct if there is anything wrong in my c function. — Vikram
– Vikram, Commented Jul 18, 2012 at 16:43
@BryanCrosby - I want a parameter as string array for the C function which I want to populate with strings in the function itself. Can you help me with the C function itself and then with marshalling part — Vikram
– Vikram, Commented Jul 18, 2012 at 16:47

Daniel Lopez · Accepted Answer · 2012-07-18 15:54:50Z

1

No entry point found. Means it cannot find the symbol. Although the function name is GetCharArray its symbol name is not named exactly GetCharArray. Make sure when you compile the native DLL you export symbols and create linker definition and name the symbol so that DllImport can function properly. If you need more help I can supply more information. I think I know why it is not working because I had a similar problem because I used DllImport correctly.

External Resources

How to create a DEF file for exporting from a DLL

P.S. There is also a command line tool to dump information from the DLL to retrieve the exact symbol name. The naming convetions of symbols vary.

edited Jul 18, 2012 at 15:54

answered Jul 18, 2012 at 15:26

Daniel Lopez

1,8083 gold badges28 silver badges40 bronze badges

Sign up to request clarification or add additional context in comments.

Collectives™ on Stack Overflow

Want to get string array as output from C Function using marshalling from C#

1 Answer 1

External Resources

Comments

Your Answer

Hot Network Questions

Collectives™ on Stack Overflow

1 Answer 1

External Resources

Comments

Your Answer

Sign up or log in

Post as a guest

Related