Search and edit text file for string

[cruzerguy]

I am new to Qt and this is my first application.

I need to search for a string in a text file and write another text file with the line that includes the search string and everything following it. I wrote the following code, but the search doesn't seem to be working. The new text file is blank because a match is not found. I would like to know what's wrong with the search.
@
int counter = 0;
int linenumb = 0;
QString search = " search string";
QFile tempfile("C:\test\temp.textf");
QFile workingdoc("C:\test\workingdoc.txt");
tempfile.open(QIODevice::ReadOnly|QIODevice::Text);
workingdoc.open(QIODevice::WriteOnly|QIODevice::Text);
QTextStream in(&tempfile);
QTextStream out(&workingdoc);
while(!in.atEnd())
{
linenumb++;
QString line = in.readLine();
if (line == search)
{break;}
}

while(!in.atEnd())
{
counter ++;
QString line = in.readLine();
if (counter >= linenumb)
{out<<line<<endl;}
}

tempfile.close();
workingdoc.close();

}
@
[andreyc EDIT]: please use @ around code

[andreyc]

Welcome to DevNet

Let say in a file C:\test\temp.textf you have
@
line1
line2
line3
@

and search string is "line2"

What do you expect as a result? Is it like this:
@
line2
line1
line2
line3
@

If so then, you did not restart input stream between two loops, so your second loop continues to a read a file from the place where first one stopped.
And I don't see where you write your "search string" to a file.

[cruzerguy]

thanks andreyc.

that's what I would like to write. I would like the new file to contain

line 2
line 3

[andreyc]

Then you don't need counters.
Just read from one file until you hit the search line and start to write after that. Something like this
@
QString line;
while(!in.atEnd())
{
line = in.readLine();
if (line == search)
{
found = true;
out<<line<<endl;
break;
}
}

while(found && !in.atEnd())
{
line = in.readLine();
out<<line<<endl;
}
@

[cruzerguy]

thanks for your help andreyc.

I fixed it, turns out it was the greater than or equal to operator. if you change the >= to <= in line 24 of my post, it works. :)