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passing fstream to a function and searching for a string

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Join Date: Nov 2008

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jimbob90

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passing fstream to a function and searching for a string

Dec 9th, 2008

read in MYDATA (with a space) from cin and find MYDATA in the file, print the line if its there. The line is going to be MYDATA + string.

 Help with Code Tags 
 c++ Syntax (Toggle Plain Text) 
int main (){
fstream filename;
filename.open(av[1]);
string name;
getline (cin, name);
lookeyLookey (name, filename);
}
void lookeyLookey (string& name, ofstream& filename){
    //how to look for MYDATA in file I have no idea
    if (found)
         cout << name << STRING AFTER MYDATA;
 
   else 
        cout << name << ": not found";
}
int main (){
fstream filename;
filename.open(av[1]);
string name;
getline (cin, name);
lookeyLookey (name, filename);
}
void lookeyLookey (string& name, ofstream& filename){
    //how to look for MYDATA in file I have no idea
    if (found)
         cout << name << STRING AFTER MYDATA;

   else 
        cout << name << ": not found";
}

Last edited by jimbob90; Dec 9th, 2008 at 9:08 pm.

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Ancient Dragon Ancient Dragon is offline

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Re: passing fstream to a function and searching for a string

Dec 9th, 2008

you need to put getline() in a loop inside the function lookyLooky() so that it reads all the lines in the file. Then on each loop iteration use the std::string's find() method to search for the desired text.

 Help with Code Tags 
 C++ Syntax (Toggle Plain Text) 
while( getline(filename, line) )
{
    // check to see if this line contains the desired string
}
while( getline(filename, line) )
{
    // check to see if this line contains the desired string
}

Don't PM me with questions -- you might get a nasty PM in response. If you have a question then post it in one of the forums.

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