search and replace in js with qt

[Same_Andy]

Hello,

I have the following problem. I want to replace a string of a variable in a JavaScript file with a function in Qt.

url = "qrc:/res/res/text.pdf";
 
void WebView::open()
{
   QFile currentFile("qrc:/res/res/pdf-viewer.js");
   QString s;
   if(!currentFile.open(QFile::WriteOnly|QFile::Text))
   {
       return;
   }
   QTextStream in(&currentFile);
   s= in.readAll();
   s.replace("$STRINGPDF",QString(url));
   qDebug()<<s;
   currentFile.close();
}

url = "qrc:/res/res/text.pdf";

void WebView::open()
{
   QFile currentFile("qrc:/res/res/pdf-viewer.js");
   QString s;
   if(!currentFile.open(QFile::WriteOnly|QFile::Text))
   {
       return;
   }
   QTextStream in(&currentFile);
   s= in.readAll();
   s.replace("$STRINGPDF",QString(url));
   qDebug()<<s;
   currentFile.close();
}

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he finds the variable not in the specified file. Because you can see I have the absolute paths of the files specified.

please help me

thanks