How do I print a variable value in QMessageBox?

Do I need to use a 开发者_开发技巧QString first then put it in the msgbox? Are there any examples?

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The QMessageBox documentation has examples in it:

QMessageBox msgBox;
msgBox.setText("Put your text here");
msgBox.exec();

There are a few others in there. Please read the docs.

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you can use the folowing example and you can add as many as arguments you want.

int device_count=0;
QString status = QString("Found %1 device(s):").arg(device_count);
QMessageBox::information(this, tr("Info"), status);