std::string object is overwritten in output stream

This is a discussion on std::string object is overwritten in output stream within the C++ Programming forums, part of the General Programming Boards category; I'm a bit puzzled as to why this is happening. If I create an ordinary string object with some text, ...

  1. #1
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    May 2008
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    9

    std::string object is overwritten in output stream

    I'm a bit puzzled as to why this is happening. If I create an ordinary string object with some text, insert it into an output stream (in the example, cout), and then insert a plain old c-string, everything is fine.

    However, when I read a line into a string object from a file input stream, the resulting string object's contents are overwritten in the output stream by whatever comes after it.

    I'm not sure if it's just my platform or compiler or something blatantly obvious that I'm overlooking, but any insight would greatly be appreciated.

    Example:
    Code:
    #include <iostream>
    #include <fstream>
    #include <string>
    
    using namespace std;
    
    int main() {
    	
    	// this works fine:
    	string str1 = "abcdefghijklmnopqrstuvwxyz";
    	cout << str1 << "OVERWRITE" << endl;
    	// result: abcdefghijklmnopqrstuvwxyzOVERWRITE
    	
    	// try reading a line from a file though...
    	string str2;
    	ifstream file("test.txt");
    	if( file.good() ) {
    		getline(file, str2);
    		file.close();
    	}
    	cout << str2 << "OVERWRITE" << endl;
    	// result: OVERWRITEjklmnopqrstuvwxyz
    	
    	return 0;
    }
    gcc version 3.4.6 on an intel i386 platform

  2. #2
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    Join Date
    May 2008
    Posts
    9
    Nevermind, figured it out. The text file was using Windows line endings and readline() uses '\n' as the delimiter, causing the string to retain the '\r', which was causing the problem.

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