can't close the Qdialog

[fatemehkarimi]

hi, everyone.
I have a class A which is a QDialog. in its constructor, it must read something from a file and if the file is not opened, the QDialog must be closed. I used

this->close();

but it doesn't work. what should I do???
thank you very much

[Chris Kawa]

In the constructor the dialog is not even shown yet, so there's nothing to close.

Usually with dialogs you have a code like this:

SomeDialog dialog;
dialog.exec();  //exec calls show() internally

so if you want to prevent it from showing you can do something like this:

SomeDialog dialog;
if (dialog.isInitialized())
    dialog.exec();

where isInitialized() would return true or false depending on what the constructor did.