replace line of a file

[kosasker]

QFile file(iplogini);
         if (!file.open(QIODevice::ReadOnly | QIODevice::Text))
        { //you can send a message or throw error signal here
           return;
             }
 
         QTextStream in(&file);
         QStringList line;
         while (!in.atEnd())
             {
                 line.append(in.readLine());
             }
         QString lineedit =line.at(4);
         lineedit.replace("StorageFolder=","Storage Folder Path");               //first arg is text that, which will 
//gone a be change and second arg is text will replace the other one...

QFile file(iplogini);
         if (!file.open(QIODevice::ReadOnly | QIODevice::Text))
        { //you can send a message or throw error signal here
           return;
             }

         QTextStream in(&file);
         QStringList line;
         while (!in.atEnd())
             {
                 line.append(in.readLine());
             }
         QString lineedit =line.at(4);
         lineedit.replace("StorageFolder=","Storage Folder Path");               //first arg is text that, which will 
//gone a be change and second arg is text will replace the other one...

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First open file, if file exist
second read file, line by line, and write each line to a string list element
third if your text file will not be change (my file is a static ini file) and if you now that which line you want to replace, we can get it from qstringlist elements with "at()" public function

so if i can get the line, which i wanted, i can write in another string, after that with replace function i can replace char to in.

Sorry for bad english!

hope this help

[masuk]

many many thanks kosasker....

[masuk]

thanks to all....specially thanks ChrisW67 and kosasker..........

[masuk]

solution code:

void Form::replace()     
{
    QFile file("E:/workplace/file1.txt");
    file.open(QIODevice::ReadOnly | QIODevice::Text);
    QTextStream in(&file);
    QString line = in.readLine();
    QString line1 = in.readLine()+"\n";
    QString line2 = in.readLine()+"\n";
    file.close();
 
 
    QFile ofile("E:/workplace/file2.txt");
    ofile.open(QIODevice::ReadWrite | QIODevice::Text);
    QTextStream out(&ofile);
    out << ui->lineEdit_2->text()+"\n";
    out << line1;
    out << line2;
    ofile.close();
 
    file.remove();
    ofile.rename("E:/workplace/file2.txt","E:/workplace/file1.txt");
 
    this->close();
 
}

void Form::replace()     
{
    QFile file("E:/workplace/file1.txt");
    file.open(QIODevice::ReadOnly | QIODevice::Text);
    QTextStream in(&file);
    QString line = in.readLine();
    QString line1 = in.readLine()+"\n";
    QString line2 = in.readLine()+"\n";
    file.close();


    QFile ofile("E:/workplace/file2.txt");
    ofile.open(QIODevice::ReadWrite | QIODevice::Text);
    QTextStream out(&ofile);
    out << ui->lineEdit_2->text()+"\n";
    out << line1;
    out << line2;
    ofile.close();

    file.remove();
    ofile.rename("E:/workplace/file2.txt","E:/workplace/file1.txt");

    this->close();

}

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