[Solved]findChild<>() issue
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Hi everyone,
It seems I have a problem with the findchild function, here are more infos:
The compiling part is ok.
The program launches.
Aaand when I enter the slot, (with findchild), it crashes.
So why do I affirm its because of findchild? Because i debbugged, its as simple as that.
To be precise, I can get the pointer, but not use it :( .
Here's some code
@void Mainwin::connectClicked()
{
QTextEdit er = this->findChild<QTextEdit>("mainte");
er->append(tr("<em>Tentative de connexion en cours...</em>"));
this->findChild<QPushButton*>("connectbut")->setEnabled(false);socket->abort(); socket->connectToHost(this->findChild<QLineEdit*>("servedit")->text(), this->findChild<QSpinBox*>("serportspin")->value());}@
when I debug, the problem comes up on the 4th line (er->append...)
Any reply is much appreciated -
hi,
Did you consider that 'er' could be zero when then QTextEdit doesn't have children??
That will cause a crash.
Greetz -
Also, you are searching for your child widgets with names. Did you set those names on the specific widgets ?
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In my honest opinion it is not good to search children by name, this is not a object orientated way of thinking. The way you do it causes classes to have multiple dependencies and updates on a class effect all the other classes, but of course sometimes you must ;-)
Greetz -
Sorry for answering late this time I am bringing new pieces of information. If I qDebug() er, er is "QObject(0x0)" so yeah its nothing.
and then i'm trying to get a pointer, I don't know if names work with these. Here's some more code:@Mainwin::Mainwin(QWidget *parent) : QWidget(parent)
{
//Things...
QTextEdit *mainte = new QTextEdit;
//things
mainlayout->addWidget(mainte);
setLayout(mainlayout);
}@Itt's also maybe because of the layout...
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mainte is the name of the variable holding your QTextEdit, no the name of the QTextEdit.
If you really want to find your QTextEdit with a name you have to call "setObjectName":http://qt-project.org/doc/qt-5.0/qtcore/qobject.html#objectName-prop
