CODEWITHSUNDEEP
visual-c++
ARV
ARV

Reputation: 1141

fstream and ostrstream is undefined

HI,

I am converting my project from vc6 to latest using vs 2010. I get problem on compiling my code

Error 931 error C2065: 'ostrstream' : undeclared identifier 1100 IntelliSense: identifier "fstream" is undefined

I have included the required files as told in Google

#if ! defined(_FSTREAM_)
    #include <fstream> 
#endif 

#if ! defined(_STRSTREAM_)      
   #include <strstream>      
#endif

When i press F12 on the fstream or ostrstream it takes to the respective files where these class are defined. Is there any other includes i have to do, i have been searching for this for long time with no luck :(

Thanks

Arvind

Upvotes: 3

Views: 12909

Answers (4)

Bezal-el
Bezal-el

Reputation: 83

Without using namespace std; as its good practice.

#include<fstream>

std::fstream fileio;

Where the fileio is the object created by fstream. The fstream class needs to be created using the std keyword as it is part of the standard library.

Hence using : using namespace std; in the code makes it work.

NOW using using namespace std; can cause conflicts in shared libraries.

#include <fstream>

using namespace std;

fstream fileio;

Upvotes: 1

fanbyprinciple
fanbyprinciple

Reputation: 780

What worked for me was a combination of two answer. After some trial and error, fstream squiggly red lines vanished when I added,

#include <fstream>
using namespace std;

Upvotes: 0

Dana
Dana

Reputation: 71

Add these to your library list:

#include <stdio.h>

using namespace std;

Upvotes: 6

Steve
Steve

Reputation: 1810

Forget all the preprocessor stuff; it's redundant at best (the files in questiion will have reinclusion guards) and at worst an error (you're assuming the #defines used, which are arbitary). Just use code like this:

#include <fstream>
#include <strstream>

Also note that the strstream header is deprecated. You should use sstream instead, but note the newer classed in this file word differently to the deprecated ones).

Upvotes: 1

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