QFileDialog accept() slot is not accessable

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I am using an instance of QFileDialog so a user can search for a directory that meets a specific criteria. When the directory signature is recognised by my code, I want to use

emit fileDialog->accept();

emit fileDialog->accept();

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I have declared this signal in the header file with

signals:
    void accept ();

signals:
    void accept ();

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so the user does not have to press the OK button. This will save the user time traversing directories.

When I try to compile with this line, I get an error: 'virtual void QDialog::accept()' is protected

Why is this compilation error occuring when QFileDialog is a sub class of QDialog?.
What can I do to get this code to work?

Any suggestions will be greatly appreciated. Thanks