asked on

Errors in simple C++ program with Visual Studio 2010 Express

Can someone tell me why I'm getting the errors below for the simple C++ program shown?

#include "stdafx.h"
#include <tchar.h>
#include <iostream>

#using <mscorlib.dll>
#using <System.dll>
#using <System.xml.dll>

using namespace System;
using namespace System::Xml;

void main(void)
{
      XmlTextReader^ reader = gcnew XmlTextReader ("books.xml");
      cout << reader->Read() ;

}

------ Build started: Project: Q815658, Configuration: Debug Win32 ------
Q815658.cpp
Q815658.cpp(17): error C2065: 'cout' : undeclared identifier
Q815658.cpp(17): warning C4804: '<<' : unsafe use of type 'bool' in operation
========== Build: 0 succeeded, 1 failed, 0 up-to-date, 0 skipped ==========

Thanks for your help...

rockiroads

urm not sure, I think in mfc it was okay not to specify .h but not sure about 2010

does it make a difference if you change

#include <iostream>

to

#include <iostream.h>

rockiroads

or maybe specify the std lib like this

std::cout << reader->Read() ;

what is reader->Read() ; doing? is that expecting input?

steva

ASKER

Actually,I made a mistake. The code should be:

void main(void)
{
XmlTextReader^ reader = gcnew XmlTextReader ("books.xml");
reader->Read() ; // read the file
cout << reader->Value;
}

But no matter, the cout still doesn't compile. If I change the #include to <iostream.h> the build says it can't fine iostream.h. At std::cout doesn't work either.

"reader" here is an XmlTextReader object frm .NET that reads the next node of the xml file "books.xml."

ASKER CERTIFIED SOLUTION

rockiroads

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steva

ASKER

Nope. Putting

using namespace std;

after the includes doesn't make any difference. cout is still an "undeclared identifier."

steva

ASKER

Ah! Got it.

cout requires the two statements

#include <iostream>
using namespace std;

But even then I can't write

cout << reader->Value;

because the thing in the .NET reader->Value is not a string.

After adding

#include <iostream>
using namespace std;

and changing that line to

cout << "A string";

I compile ok. So I'm still not sure how to display what's in reader->Value but at least the build problem is solved. Thanks for your help. I gave you the points for working with me on it.

steva

ASKER

Solved it myself, though the dialog with rockiroads was helpful.

rockiroads

Hi Steva. Went to bed soon after last posting.

So what did you do when you solved it. Did you assign reader->value to a string variable then outputted that variable?

steva

ASKER

The magic combination to get cout to be recognized was

#include <iostream>
using namespace std;

or

#include <iostream>

std::cout

iostream.h doesn't work.

But even after that the combination of cout and reader->Value didn't work because the .NET reader->Read() function put something into reader.Value that wasn't compatible with the type of string that cout was expecting. I ended up using String^ s = reader.Value.

By the way, I posted two more questions on .NET and Visual Studio Express at

https://www.experts-exchange.com/questions/26497579/Is-there-an-XMLTextReader-without-NET.html

and

https://www.experts-exchange.com/questions/26496756/Converting-a-Visual-C-6-0-MFC-application-to-Visual-Studio-2010.html

if you have time and feel like looking at them.

Steve