OctaveLinkToWindowsDLLs

Linking Octave to Windows DLLs

• Sample DLL source to link to octave

  // FILE: d_vcc.cpp
  #include <windows.h>
  extern "C" {
    BOOL WINAPI DllMain( HINSTANCE, DWORD, LPVOID ) { return 1;}
  
    int __declspec(dllexport)
    msgbox_plus_one( const char * text ){
        return MessageBox( NULL, text, "TITLE",
              MB_ABORTRETRYIGNORE | MB_SETFOREGROUND) + 1;
    }
  }

• Compile with MSVC++ (or using your IDE) cl -nologo -LD d_vcc.cpp user32.lib

• Now, create a file d_gcc.cc which links to this function

  // FILE: d_gcc.cc
  #include <octave/oct.h>
  extern "C" {
  int msgbox_plus_one( const char * text );
  }
  DEFUN_DLD (d_gcc,args, , "usage d_gcc('string')" ) {
     octave_value_list retval;
     retval(0) = (double) msgbox_plus_one( args(0).string_value().c_str() );
     return retval;
  }

• Compile this file to an *oct file using LFLAGS="`mkoctfile -p LFLAGS` d_vcc.dll" mkoctfile -v d_gcc.cc

• Voila, now call d_gcc("string") from octave