DLL Import Errors

Question

Hello,

I'm really new to Unity and I try to load a c++ .dll into my unity script.

Heres my Problem.

The C++ Projekt have one Method in the .cpp:

         bool Connect(string c_szAddr) {
             return true;
     }

And thats the .h Part:

 extern "C" { __declspec(dllexport) bool Connect(string c_szAddr); }

Now I load the dll and try to pass a string value to my C++ Method:

        [DllImport("LoginRess")]
         private static extern bool Connect(string c_szAddr);
     
         public void __cplusplusconnect(string name, string password)
         {
             Debug.Log(Connect(CONFIG.IP));
         }

If I use this function...I get a strange error: alt text

And the Unity Editor Dies after this^^. The Strange Thing is, when I use my Method without any param...theres no error. Thank you for any help.

Answer 1

Answer by zachasplays · Jul 31, 2016 at 01:56 PM

I have found the problem

          bool Connect(string c_szAddr) {
              return true;
      }

I don't know why, but it CAN'T get the param as a string. Here it must be const char*...

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DLL Import Errors

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