QLineEdit problem (Jambi)

[Binji]

First of all hello to everyone. Im still new to Qt but getting better

And now to my question.. i have a QLineEdit widget which must not be empty when user clicks a certain button. So i wrote this:

if (serverAddress.text().trim()!= "" && serverAddress.text().trim() != null) {
			serverNameValid = true;
		}else {
			errorMessage += "\nServer name cannot be empty!";
		}

if (serverAddress.text().trim()!= "" && serverAddress.text().trim() != null) {
			serverNameValid = true;
		}else {
			errorMessage += "\nServer name cannot be empty!";
		}

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Simple enough right? But the problem is.. it doesnt work! text() method never returns an empty string even if the QLineEdit widget is empty! Is there anything i missed?

Thanks for your reply

edit: I apologize if I shouldnt post Jambi stuff here but didnt see any other appropriate forum.

[wysota]

Why not do something like this?

connect(serverAddress, SIGNAL(textChanged(const QString &)), this, SLOT(check(const QString &)));
void myClass::check(const QString &str){
  button->setEnabled(!str.isEmpty());
}

connect(serverAddress, SIGNAL(textChanged(const QString &)), this, SLOT(check(const QString &)));
void myClass::check(const QString &str){
  button->setEnabled(!str.isEmpty());
}

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It's C++ code, but it's very simple so you should have no trouble translating it to Java. Oh, and check() has to be a slot, of course.