How to replace a particular text in a file located at any place..?

[Ketan Shah]

This is my code....I want to replace a text in a file, is this correct can any1 help me...
@
QFile file("E:/qtpro/Abc1.txt");
file.open(QIODevice::ReadWrite | QIODevice::Text);
file.reset();

QTextStream fl(&file);
// QTextStream f2(&file);
QString str;

str = fl.readLine();

while (!str.isNull()) {
if (str == "Shah") {
//str.replace("Shah",";Shah",Qt::CaseSensitive);
fl<<";Shah"<<str<<"\n";
}
str = fl.readLine();
@

[Mark up code, Tobias]
Edit: And again, by André.

[tobias.hunger]

You do not want to write into the file you are reading.

[Ketan Shah]

Thanx...it worked..

[giesbert]

Read the file completely into memory, change the content and then write again.
Or create a temporary second file, read the original, change the text and write to the second one.