qt apple mac

[aamir121a]

when using QT IDE in Apple Mac 10.6.3 , I am using STD C++ libraries
iostream , fstream and string

when compiling applkcation I get the following error

/Users/aamir/untitled/copyfile/copyfile1-build-desktop/../copyfile1/main.cpp:18: error: 'fstream' was not declared in this scope

I get the same for string as well as iostream , if I include any QT libraries then it is fine as you can see QString work fine, any help be much appreciated

here is my code

#include <QtCore/QCoreApplication>
#include <iostream>
#include <fstream>
#include <string>
#include <string.h>
#include <QtCore>


typedef struct _inbuffer
{
    unsigned char buf[200];
} inbuffrer;

int main(int argc, char *argv[])
{
    QCoreApplication a(argc, argv);
    QString filename1 = "appzapper.dmg";
    fstream instream(filename1.toStdString().c_str(),std::ios::binary|std::ios::in);

    return a.exec();
}

[Russco]

std::fstream

fstream is a member of namespace std.

[aamir121a]

Thank You