Help C++ and VB

Help C++ and VB

• Chris242

  has anyone ever used vb and c++ in the same solution before
  
  

• mjhadden

  I forgot to add that the VB code and C++ code are 2 projects in the same solution, i have added refferences to both projects. i have allready made an instance of the C++ class in vb and had it return a number and msgbox the value.
  

  
  example:
  =========VB==========
  

  MsgBox(CppObj.go())
  

  =========VB==========
  

  =========C++==========
  int go(){
  

      return 5;
  

  }
  

  =========C++==========

  Basicly it made a msg box with the number 5.
  

  I guess my question is, is it possible to pass a instance of a VB class object to a C++ function and make calls to it in the c++ function, if you need any other information just let me know or if you know where this should be posted in the forums.
  
  Thanks again.

  
  

• Den1se

  i see what your saying, the only problem is that my objVB is very complex and cannot be mirrored. also im not using a .dll, its a C++ project
  
  my solution is set up:
  
  Solution
   | --vbProject
   |             |-----References
   |                             |-----cppProject
   |                             |-----mscorlib
   |--cppProject
   |             |-----References
   |                             |-----vbProject
   |                             |-----mscorlib
  
  i've also been playing around, keeping it simple
  right now i get complier" error C2065 'objVB' : undeclared identifer"
  
  my code is like this:
  -----------------------
  int cppClass::go(){
     
      objVB *test;
  
  }
  -------------------------
  and if i hover the mouse over objVB it says "__gc class vbProject::objVB" in a popup bubble. now should i have some type of "using vbProject" im a little new at this cross compiling with vb and c++ in the same solution....
  
  ------------------------------------------------------------------------------------------
  here's the actual code
  c:\Programming\haDBX\haDBX.cpp(10): error C2065: 'clsLogging' : undeclared identifier
  
  --------haDBX.h-----------
  #using <mscorlib.dll>
  
      public __gc class haDBX
      {
      public:
          haDBX();       
          int go();
      };
  --------haDBX.h-----------
  
  --------haDBX.cpp-----------
  #include "haDBX.h"
  
  haDBX::haDBX(){
  
  }
  
  int haDBX::go(){
      clsLogging *bob;
  
  }
  --------haDBX.cpp-----------
  
  im thinking im missing some includes/using/somthing
  
  

• HarrisTL

  Can anyone help
  
  

• Zak Jensen

  I recommend Passing a structure to the C++ dll that is mirrored in C++
  
  like this
  
  --------vb---------
  
  <DLLImport "TEST.DLL"> Private Shared Function Test (byref _OBJStructure as objStructure) as integer
  
  public structure objStructure
   dim x as integer
  dim y as integer
  end structure
  
  public function invokeDLL(val as integer) as integer
  
  dim xObj as objStructure
  xObj.x = 1
  Test (xObj)
  return xObj.y
  
  
  end function
  
  -----------c++----------------
  
  struct objStruct
  {
  int x;
  int y;
  };
  
  int __stdcall Test(objStruct *xObj)
  {
     xObj->y == xObj->x + 1;
  }
  
  ---------------------------------
  
  Try that
  
• Help C++ and VB