Access to the user interface
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So is it working as you expect it to ? 
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Rather than 
 @
 QTextStream in(&file);
 setItsContent(in.readAll());@Why not just: 
 @
 setItsContent(file.readAll());
 @In any case, are you sure that your file is not empty ? 
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Did you check what file.readAll() contains ? since setItsContent only assign the parameter value to your itsContent member variable why not just do: @itsContent = file.readAll()@ ? By the way, you should use const QString& in your setItsContent function, that will avoid unnecessary copies. 
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Okey ehm file.readAll() return the right content of the file, the problem is, that it doesn't convert it into QString. readAll() gives back a QByteArray wich normaly could be converted in QString with for example: 
 @itsContent = QString(file.readAll());@But it doesn't ... here is the function again: 
 @bool Data::openContent(bool customFileName){
 if(itsContentFilename.isEmpty() || customFileName)
 itsContentFilename= QFileDialog::getOpenFileName(MyFxhnn, tr("Inhalt öffnen"), QString(), tr("Fxhnn Content Files (*.txt)"));if(!itsContentFilename.isEmpty()){ QFile file(itsContentFilename); if(!file.open(QIODevice::ReadOnly)){ QMessageBox::critical(MyFxhnn, tr("Error"), tr("Could not open file")); return false; } QTextStream in(&file); QMessageBox::information(MyFxhnn, "Content of readAll(", file.readAll()); itsContent = QString(file.readAll()); QMessageBox::information(MyFxhnn, "Content of itsContent", QString(file.readAll())); printItsContent(); file.close(); if((itsContent != MyFxhnn -> ui -> itsText -> toPlainText()) || itsContent == ""){ QMessageBox::critical(MyFxhnn, tr("Error"), tr("Fehler beim Öffnen, Data != Textfeld")); return false; } } return true;}@ The Message "Content of readAll()" gives back the right content the other message return nothing an the last error message appears. 
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Now it's working a 'bit'. 
 It is able to read the file and print it into the output, BUT it doesn't save onicode ... and I need unicode so we have to find an other solution :/ :D
 @bool Data::openContent(bool customFileName){
 if(itsContentFilename.isEmpty() || customFileName)
 itsContentFilename= QFileDialog::getOpenFileName(MyFxhnn, tr("Inhalt öffnen"), QString(), tr("Fxhnn Content Files (*.txt)"));if(!itsContentFilename.isEmpty()){ QFile file(itsContentFilename); if(!file.open(QIODevice::ReadOnly)){ QMessageBox::critical(MyFxhnn, tr("Error"), tr("Could not open file")); return false; } //QTextStream in(&file); //QMessageBox::information(MyFxhnn, "Inhalt von readAll()", file.readAll()); QByteArray tempString = file.readAll(); itsContent = tempString; QMessageBox::information(MyFxhnn, "Inhalt von itsContent", itsContent); printItsContent(); file.close(); if((itsContent != MyFxhnn -> ui -> itsText -> toPlainText()) || itsContent == ""){ QMessageBox::critical(MyFxhnn, tr("Error"), tr("Fehler beim Öffnen, Data != Textfeld")); return false; } } return true;}@ and here are the printItsContent(): 
 @void Data::printItsContent(){
 //MyFxhnn -> ui -> itsText->clear(); <- If I uncomment this line it clear the output text, but it can't set it again
 MyFxhnn -> ui -> itsText -> setPlainText(itsContent);
 setItsEncryptLevel(0);
 setItsShuffleLevel(0);
 return;
 }@
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That's the kind of detail that's good to share. Then it seems that you should use QTextCodec 
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What do you mean by "only with textstream" ? 
