Problem calling C# dll using JNI

Question

Hi,
I'm trying to call C# functions from a JNI interface. I built a C++ DLL to link the Java and C# calls together, but I am always getting the same error. Calling the C# DLL directly from the C++ code (compiled as an application) does not cause this error. I have to be able to connect our java application with a third party C# DLL, so I cannot just right the DLL directly in C++... Here is my code:
//C# Class Library::
namespace ClassLibrary2
     /// <summary>
     /// Summary description for Class1.
     /// </summary>
     public class Class1     
          public Class1()
               // TODO: Add constructor logic here
          public void Bidon1()
     MessageBox.Show("Affiche", "Toi", MessageBoxButtons.OK, MessageBoxIcon.Exclamation);
//C++ DLL::
#using "ClassLibrary2.dll"
BOOL APIENTRY DLLMain(HANDLE hModule, DWORD  ul_reason_for_call, LPVOID lpReserved) {
  return TRUE;
JNIEXPORT void JNICALL Java_com_blablabla_CommJNIDLL_Init
(JNIEnv * enivronmt, jobject obj)
     new ClassLibrary2::Class1();
     (new ClassLibrary2::Class1())->Bidon1();
Olivier dit :
//Java JNI Calls::
//From CommJNIDLL::
     static {
          System.loadLibrary("MyCDLL");
     public native void Init();     If I comment the calls within the C++ DLL, they get fired, and no exception is raised. What am I doing wrong?
Thanks, bumpert

Answer 1

Hi,
I am currently also trying to call some C# code within JNI. So far I have managed to call some simple C# code in Java through JNI based on the example on codeproject. However, now my problem is that instead of doing JNI-->C++->M C++->C#, I need to include one more reference to some other DLLs in the C# code. Therefore I need to do JNI-->C++-->M C++-->C#-->DLL. So is there a way to do this? I can compile all the code sucessfully in C++, but when I try to execute the .netmodule (for C#) and DLL for C++ through JNI in Java, it gives me an error. I have tried to put all the relevant DLLs in the same directory, but it still does not work. So is there someway to combine the .netmodule of C# with the DLLs it references to? Perhaps that could solve the problem? I am new to C# and C++, really appreciate if someone can give some advices since there's nothing much on the net.
thanks,
Lee