need help on this fstream object coding

This is a discussion on need help on this fstream object coding within the C++ Programming forums, part of the General Programming Boards category; hi i want open() accept a pointer or a reference to an ofstream object. That way, it can modify the ...

  1. #1
    Registered User
    Join Date
    Oct 2008
    Posts
    61

    need help on this fstream object coding

    hi i want open() accept a pointer or a reference to an ofstream object. That way, it can modify the ofstream object and pass the modified object back to the caller.
    but having trouble with my coding
    my compiler crashes..and i can't find the error becoz of that
    can anyone check whats wrong
    basically i want to open a new fstream file with any string name and pass it back to the main so it can be used..
    Code:
    #include<string>
    #include<iostream>
    #include<fstream>
    void &open(ofstream&);
    string filename;
    
    void &open(ofstream &a)
    {
    
    cout<<"name of file to save"<<endl;
    getline(cin,filename);
    
    a.open(filename.c_str(),ios::in| ios::out);
    a<<"writing this to a file\n";
    a.close();
    
    }
    
    int main()
    {
    ofstream b;
    cout<<"testing how open files from another function"<<endl;
    open(b);
    return 0;
    }

  2. #2
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    Mar 2007
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    416
    using namespace std;

  3. #3
    a_capitalist_story
    Join Date
    Dec 2007
    Posts
    2,652
    Ummmm....I don't think you can return a reference to void? Perhaps you should start with something that actually compiles, rather than tossing crap code together and looking for someone on the internet to fix it for you.

  4. #4
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    Oct 2008
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    61
    ok2 i get this working.
    sorry for that.
    i searched every place for ofstream tutorial which shows usage of reference that can be passed back to main..but i still cannot find it..any useful links?

  5. #5
    a_capitalist_story
    Join Date
    Dec 2007
    Posts
    2,652
    You need to understand passing by reference. It's got NOTHING to do with ofstream...it has to do with UNDERSTANDING THE FUNDAMENTALS. Stop trying to slap code together you find and PUT IN THE EFFORT TO LEARN AND UNDERSTAND!!!! You've been at this for at least a year, and you don't seem to have a learned anything.

    EDIT: Reference
    Last edited by rags_to_riches; 12-26-2009 at 09:51 AM.

  6. #6
    Registered User
    Join Date
    Sep 2008
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    48
    Happy holydays!
    Code:
    void open (fstream &StreamObject)
    {
    	char FileName[255];
    	cout<<"Name of file: ";
    	cin.getline( FileName, 255, '\n' );
    	StreamObject.open (FileName, ios::out);
    	if ( StreamObject.is_open() )
    	{
    		//Write something to it
    		StreamObject<<"Something";
    	}
    	else
    	{
    		//Error message
    		cout<<"Failed to open file.\n";
    	} 
    
    }

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