Why I am getting this error in c++ code

Question

I have this simple code:

std::ifstream ifs;
ifs.open ("test.txt", std::ifstream::in);
char c = ifs.get();
while (ifs.good()) {
   std::cout << c;
   c = ifs.get();
}
ifs.close();

But I am getting a lot of error? such as:

Error   9   error C3083: 'ifstream': the symbol to the left of a '::' must be a type    test.cpp    
Error   8   error C2228: left of '.open' must have class/struct/union   test.cpp

and so on.

I have these definitions at the start of file

#include <iostream>
#include <fstream>
#include "stdafx.h"
using namespace std;

I am using VS2012 on a console application.

edit1:

The complete code is as follow:

void ReadRawImages::Read(int frameNumber)
{
std::ifstream ifs;

      ifs.open ("test.txt", std::ifstream::in);

       char c = ifs.get();

       while (ifs.good()) {
            std::cout << c;
            c = ifs.get();
       }

  ifs.close();


 }

I also noted that I have these warnings:

Warning 1   warning C4627: '#include <iostream>': skipped when looking for precompiled header use   test.cpp
Warning 2   warning C4627: '#include <fstream>': skipped when looking for precompiled header use    test.cpp

Can you post the code immediately before `std::ifstream ifs;`? Possibly you missed a semicolon somewhere earlier. — Roger Rowland, May 23 '13 at 11:29
ditch the line "using namespace std" as you use std:: comprehensively — Bathsheba, May 23 '13 at 11:31
[Your code works fine](http://eval.in/31344). Did you wrap that code in a function at all? — Niels Keurentjes, May 23 '13 at 11:33
@NielsKeurentjes Thanks, I am sure that codes is correct, the problem is I am not sure that my setup is correct. What should I do to run this code in MS Visual C++ 2012? — mans, May 23 '13 at 11:35

masoud · Accepted Answer · 2013-05-23T11:42:48.087

3

Put header files after #include "stdafx.h"

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

stdafx.h must be the first included file, this is Microsoft specific rule.

Visual C++ will not compile anything before the #include "stdafx.h" in the source file, unless the compile option /Yu'stdafx.h' is unchecked (by default) ¹

edited May 23 '13 at 11:42

answered May 23 '13 at 11:35

masoud

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Oh, I already answered same question before, read [this](http://stackoverflow.com/a/16040876/952747). – masoud May 23 '13 at 11:45

score 2 · Answer 2 · answered May 23 '13 at 11:35

2

Your project is probably making use of precompiled headers. If so, the first line of each .cpp file should be:

#include "stdafx.h"

Or whatever the name of the header is.

answered May 23 '13 at 11:35

Andy Prowl

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Why I am getting this error in c++ code

2 Answers2