Thread: Beginner MS Visual C++ User

I have just downloaded Visual C++ and am trying to write a noddy application. I am well versed in C++ and write for the unix platform.

I am therefore bemused by the compilation errors MS VC++ gives!


Here are the headers///

Code:

#pragma once

ref class FactoryBase
{
public:
	FactoryBase(void);
public:
	virtual ~FactoryBase(void);
};


#pragma once
#include "factorybase.h"
class Widget;

ref class Factory : public FactoryBase
{
public:
	Factory(void);
public:
	virtual ~Factory(void);

	Widget * const CreateWidget();
};


#pragma once

ref class Widget
{
public:
	Widget(void);
public:
	virtual ~Widget(void);
};

And now for the source!

Code:

// Factory.cpp : main project file.

#include "stdafx.h"
#include "Factory.h"
#include "Widget.h"

using namespace System;

int main(array<System::String ^> ^args)
{
    Console::WriteLine(L"Hello World");
    return 0;
}

Factory::Factory(void)
{
}

Factory::~Factory(void)
{
}

Widget * const Factory::CreateWidget()
{
	return new Widget();
}
#include "StdAfx.h"
#include "FactoryBase.h"

FactoryBase::FactoryBase(void)
{
}

FactoryBase::~FactoryBase(void)
{
}


#include "StdAfx.h"
#include "Widget.h"

Widget::Widget(void)
{
}

Widget::~Widget(void)
{
}

Finally this output?

Code:

1>------ Build started: Project: Factory, Configuration: Debug Win32 ------
1>Compiling...
1>Factory.cpp
1>c:\documents and settings\kevin matthews\my documents\visual studio 2005\projects\factory\factory\Widget.h(4) : error C3816: 'class Widget' was previously declared or defined with a different managed modifier
1>        c:\documents and settings\kevin matthews\my documents\visual studio 2005\projects\factory\factory\Factory.h(3) : see declaration of 'Widget'
1>.\Factory.cpp(24) : error C3699: '*const ' : cannot use this indirection on type 'Widget'
1>        compiler replacing '*const ' with '^' to continue parsing
1>.\Factory.cpp(24) : error C2556: 'Widget ^Factory::CreateWidget(void)' : overloaded function differs only by return type from 'Widget *const Factory::CreateWidget(void)'
1>        c:\documents and settings\kevin matthews\my documents\visual studio 2005\projects\factory\factory\Factory.h(12) : see declaration of 'Factory::CreateWidget'
1>.\Factory.cpp(24) : error C2373: 'Factory::CreateWidget' : redefinition; different type modifiers
1>        c:\documents and settings\kevin matthews\my documents\visual studio 2005\projects\factory\factory\Factory.h(12) : see declaration of 'Factory::CreateWidget'
1>.\Factory.cpp(25) : error C2750: 'Widget' : cannot use 'new' on the reference type; use 'gcnew' instead
1>Build log was saved at "file://c:\Documents and Settings\Kevin Matthews\My Documents\Visual Studio 2005\Projects\Factory\Factory\Debug\BuildLog.htm"
1>Factory - 5 error(s), 0 warning(s)
========== Build: 0 succeeded, 1 failed, 0 up-to-date, 0 skipped ==========

Is this Managed C++ or C++/CLI or something? The error messages indicate that you aren't compiling as regular C++. If you meant to use standard C++ as you would on unix, then you have to create a Win32 Console Application project to get the right settings. If you meant to use the .NET based languages, then you might get more help in another board as most of the people here, even those who use Visual C++, are using regular C++.

I will check whether I messed up at first base! (Specifying a C++ console application)

Thanks all.