how to split a string and set as variable then show in plaintext editor?

[vehicular]

Hello I search a line and find it and show in plaintext editor.

But I wantto split the line and show only some parts.
file look like this ;
prm1 ;456
prm2;235 and it goes on.

When it finds prm1 it should set prm1=456;
and then I should show it on plain text editor. Tried split() but after split I can not show it on the plaintext editor.

Please help me to do it.

ifstream input;
size_t pos;
string line;

input.open("D:/qt/project/QFileDemo/myfile.txt");
if(input.is_open())
{
while(getline(input,line))
{
pos = line.find("<Prm1>");
if(pos!=string::npos) // string::npos is returned if string is not found
{

 QFile file("D:/qt/project/QFileDemo/myfile.txt");
 if(!file.open(QFile::ReadOnly | QFile::Text))
 {
     QMessageBox::warning(this,"title","file not open");

 }

 QTextStream in(&file);
 //QString text=in.readAll();
 QString text=in.readLine();

 ui->plainTextEdit->setPlainText(text);

 file.close();

break;
}
}
}

[Christian Ehrlicher]

Why do you mix std and Qt here? Why do you need ifstream at all?
Splitting strings can be done with e.g. QString::split()

[vehicular]

@christian-ehrlicher I need to find a specific line, there will be hundreds of lines. code is done in c++ thats why ifstream. You can suggest other methods.
Tried splitting, maybe Splitting fine but how to set them as variables and show them in the plaintexteditor ? thats the actual question.
Tried many things but could not show them in the plaintext editor.

[Christian Ehrlicher]

You already use QTextStream::readLine() - so why do you read it with ifstream before? You simply read it twice for no reason.