How to call a C dll generated by R CMD SHLIB, from C#? -

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i call method in dll code written in c c # code can't that. error message is:

unhandled exception: system.badimageformatexception: attempt made load program incorrect format. (exception hresult: 0x8007000b) @ displaymessagedll.program.dividetwo(int32 a, int32 b, int32* res) @ displaymessagedll.program.main(string[] args) in c:\users\mat\documents\visual studio 2013\projects\displaymessagefromdll\consoleapplication1\program.cs:line 30 press key continue . . .

in fact, dll generated following command line in windows console: r cmd shlib --preclean simple.c

code of simple.c class is:

void dividetwo(int a, int b, int *result) { *result = a/b; } void rdividetwo(int *a, int *b, int *result) { dividetwo(*a, *b, result); }

and c# code calls dividetwo() method :

using system; using system.collections.generic; using system.linq; using system.text; using system.threading.tasks; using system.runtime.interopservices; using rdotnet; using rdotnet.nativelibrary; using rdotnet.utilities; using rdotnet.internals; using rdotnet.dynamic; using rdotnet.diagnostics; using rdotnet.devices;  namespace displaymessagedll {     class program     {         [dllimport("c:/rdoc/simple.dll", callingconvention = callingconvention.cdecl, charset = charset.unicode)]         unsafe public static extern void dividetwo(int a, int b, int* res); // dll support          unsafe static void main(string[] args)         {             int = 25, b = 25;             int res = 0;              dividetwo(a, b, &res);             console.writeline("result of " +a+ " / " +b+ " = " + res);              console.read();          }     } }

why isn't dll generated command 'r cmd shlib simple.c' accessible c# code? whereas if generate dll in visual studio 2013 same code, dll accessible c # code.


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