Reading text from a PlainTextEdit

[Bertie]

Hello,

This I'm sure is an immensely stupid question, however it's so simple that I can't find the answer to it by searching anywhere. I want to take the information from a PlainTextEdit, put it into a variable and use it elsewhere (for example to populate another box later on). I have the following, where LatEdit and EastingText are both PlainTextEdit's, but get the error 'LatEdit was not declared in this scope'. If I change it to 'num1 = "TEST";' then it will work, so I'm assuming it's me reading in the text incorrectly from the LatEdit control.

void MainWindow::on_pushButton_clicked()
{
    QString num1;
    num1 = LatEdit->Plain;
    ui->EastingText->setPlainText(num1);
}

void MainWindow::on_pushButton_clicked()
{
    QString num1;
    num1 = LatEdit->Plain;
    ui->EastingText->setPlainText(num1);
}

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Can anyone help me?

Thanks