Subj : mixing c/c++ (revised [2] )
To   : borland.public.cpp.borlandcpp
From : "Rob C" <robb_christiansen@juno.com>
Date : Fri Jul 18 2003 11:00 am

It’s better, but it still doesn’t work. Would someone please 
just take the time to write in the code to make this work. I’ve 
been screwin’ around with this damn thing far too long but still 
nothing works and I’m getting so frustrated!

In this program, C++ (Borland example program) passes to C which 
initializes the char 
array [I’ll go with char, and not string], returns to C++ and is 
passed to another C which “cats” onto that same char array, 
which then returns and C++ prints it in a window.

Info :Making...
Info :Making...
Info :Compiling C:\BC5\EXAMPLES\OWL\TUTORIAL\step01.cpp
Error:  step01.cpp(62,3):Cannot convert 'char ( *)[25]' to 'char *'
Error:  step01.cpp(62,3):Type mismatch in parameter 'AddString' in call to 'InitVars(char *)'
Error:  step01.cpp(63,3):Cannot convert 'char ( *)[25]' to 'char *'
Error:  step01.cpp(63,3):Type mismatch in parameter 'AddString' in call to 'AddToEnd(char *)'
-=------------------- step01.cpp 
#include <owl/pch.h>
#include <owl/applicat.h>
#include <owl/framewin.h>

extern "C" int AddToEnd( char *AddString );
extern "C" int InitVars( char *AddString );

   char AddString[25];

class TDrawWindow : public TWindow {
  public:
    TDrawWindow(TWindow* parent = 0);

  protected:
    // Override member function of TWindow
    bool CanClose();

    // Message response functions
    void EvLButtonDown(uint, TPoint&);
    void EvRButtonDown(uint, TPoint&);

  DECLARE_RESPONSE_TABLE(TDrawWindow);
};

DEFINE_RESPONSE_TABLE1(TDrawWindow, TWindow)
  EV_WM_LBUTTONDOWN,
  EV_WM_RBUTTONDOWN,
END_RESPONSE_TABLE;

TDrawWindow::TDrawWindow(TWindow* parent)
{
  Init(parent, 0, 0);
}

bool
TDrawWindow::CanClose()
{
  return MessageBox("Do you want to save?", "Drawing has changed",
                    MB_YESNO | MB_ICONQUESTION) == IDNO;
}

void
TDrawWindow::EvLButtonDown(uint, TPoint&)
{
  MessageBox("You have pressed the left mouse button",
    "Message Dispatched", MB_OK);
}

void
TDrawWindow::EvRButtonDown(uint, TPoint&)
{
  MessageBox("You have pressed the right mouse button",
    "Message Dispatched", MB_OK);
}

class TDrawApp : public TApplication {
  public:
    TDrawApp() : TApplication() {}

    void InitMainWindow()
    {
            InitVars( &AddString ); //<-- C code
           AddToEnd( &AddString ); //<-- C code
      SetMainWindow(new TFrameWindow(0, AddString, //"Sample ObjectWindows Program"
        new TDrawWindow));
    }
};

int
OwlMain(int /*argc*/, char* /*argv*/ [])
{
  return TDrawApp().Run();

}
----------------------------- Initvars.c ----------
#include <stdio.h>
#include <string.h>

int InitVars( char *AddString ) //Initialize Variables
{ //89
    strcpy( AddString, "This is C++,");

return (0);
} //89
-------------------------------- AddToEnd.c -------
#include <stdio.h>
#include <string.h>

int AddToEnd( char *AddString )
{ //89
	char message[] = " and this is C ";

strcat( AddString, message );
return (0);
} //89
------------------------------------------

.