validaton on file name

[fortyhideout12]

I won't to enforce a QMessage box warning stating the user that the character length is too long for a particular name. I want the character name to be > than 10 characters.

Here is my code so far.

bool MainWindow::saveFile(const QString &fileName)
 {
     QFile file(fileName);
	[B] QString ext = fileName.completeSuffix();
		if(ext.completeSuffix() > 10)
		{
		 QMessageBox::warning(this, tr("BAD FILE NAME"));
		}
		else[/B]
     if (!file.open(QFile::WriteOnly | QFile::Text)) {
         QMessageBox::warning(this, tr("Application"),
                              tr("Cannot write file %1:\n%2.")
                              .arg(fileName)
                              .arg(file.errorString()));
         return false;
     }
 
     QTextStream out(&file);
 #ifndef QT_NO_CURSOR
     QApplication::setOverrideCursor(Qt::WaitCursor);
 #endif
     out << textEdit->toPlainText();
 #ifndef QT_NO_CURSOR
     QApplication::restoreOverrideCursor();
 #endif
 
     setCurrentFile(fileName);
     statusBar()->showMessage(tr("File saved"), 2000);
     return true;
 }

bool MainWindow::saveFile(const QString &fileName)
 {
     QFile file(fileName);
	[B] QString ext = fileName.completeSuffix();
		if(ext.completeSuffix() > 10)
		{
		 QMessageBox::warning(this, tr("BAD FILE NAME"));
		}
		else[/B]
     if (!file.open(QFile::WriteOnly | QFile::Text)) {
         QMessageBox::warning(this, tr("Application"),
                              tr("Cannot write file %1:\n%2.")
                              .arg(fileName)
                              .arg(file.errorString()));
         return false;
     }
 
     QTextStream out(&file);
 #ifndef QT_NO_CURSOR
     QApplication::setOverrideCursor(Qt::WaitCursor);
 #endif
     out << textEdit->toPlainText();
 #ifndef QT_NO_CURSOR
     QApplication::restoreOverrideCursor();
 #endif

     setCurrentFile(fileName);
     statusBar()->showMessage(tr("File saved"), 2000);
     return true;
 }

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For some reason I can't figure out a way to enforce this validation as I'm fairly new to Qt. Does anyone have any suggestions for this? Thank you so much.

[Lykurg]

I guess you have to start a little bit earlier. I guess you querying the name via a QLineEdit and then the user press a button. only set the button enabled if the line edit contains more the 10 characters. do that with a custom slot which which the textChanged signal of the line edit is connected to.

otherwise just add an "return false;" after your message box.