Hello,
i have compiled lazarus r 21928 with qt45 and
bindings libqt4intf v1.72.

The demo "lclwebkit2" from the homepage of
libqt4intf gives 10 errors, what is going wrong?

settingsdlgu.pas(45,5) Warning: Destructor should be public
settingsdlgu.pas(44,17) Warning: An inherited method is hidden by "constructor TSettingsDlg.Create(TComponent);"
settingsdlgu.pas(33,46) Hint: Parameter "CloseAction" not used
main.pas(79,17) Warning: An inherited method is hidden by "constructor TWebPanel.Create(TWinControl, QNetworkAccessManagerH, TEdit, TProgressBar);"
main.pas(292,99) Error: Incompatible type for arg no. 2: Got "TMethod", expected "<procedure variable type of procedure of object;CDecl>"
qt45.pas(622,13) Hint: Found declaration: QObject_hook_hook_destroyed(QObject_hookH, QObject_destroyed_Event); CDecl;
main.pas(305,51) Error: Incompatible type for arg no. 2: Got "TMethod", expected "<procedure variable type of procedure(QUrlH) of object;CDecl>"
qt45.pas(13497,11) Hint: Found declaration: QWebView_hook_hook_urlChanged(QWebView_hookH, QWebView_urlChanged_Event); CDecl;
main.pas(308,52) Error: Incompatible type for arg no. 2: Got "TMethod", expected "<procedure variable type of procedure of object;CDecl>"

...and much more.

Regards Th. Moritz

Thomas Moritz wrote

The demo "lclwebkit2" from the homepage of libqt4intf gives 10 errors, what is going wrong?

Version 1.72 of the FreePascal Qt4 Binding improved Qt Signal hooking (more type safe). When hooking a pascal method to a Qt signal, the method type is checked now.

The LCL/Qt WebKit demo was updated together with the binding, you need to download the new version of the demo again. To accommodate for windows users, it is a zip file now.

The LCL/Qt WebKit demo is not meant to be full blown browser, it just provides a demonstration of cookie saving,tabbed browsing, proxy usage,server authentication,flash,printing, ...

http://users.telenet.be/Jan.Van.hijfte/qtforfpc/fpcqt4.html

kind regards,

Den Jean

And I must tell you that some strange ide crashes (linux with pretty old Xorg 6.8.2) which happens before 1.72 just dissapeared with new hooks (yes, I can reproduce that each time before 1.72 , now I cannot - so it seem to be nice thing with new signal hooking) :))))

zeljko

And I must tell you that some strange ide crashes (linux with pretty old Xorg 6.8.2) which happens before 1.72 just dissapeared with new hooks

:-[ as already mentioned on the LCL/Qt ML I also fixed a bug (since V1.71)

The type safe calling should not change anything to existing correct code. It just verifies at compile time that the signature of the provided Pascal Method is of the correct type.

Hooking a signal of a Qt Object X to a Pascal Object Method, works by creating a hooking object HOOK written in Qt/C++, that stores the address of the Pascal Object Method and the address/handle of the Qt Object X.

The HOOK connects to the signal of X and calls the Pascal method when the signal occurs.

In the destructor of the hook, I disconnected from the Qt Object X. But in the mean time the stored handle to X could have become invalid, if the Qt Object X had been destroyed.

Now the HOOK also connects to the destroyed signal of X, and invalidates the handle to it, upon reception of that destroyed signal.

(yes, I can reproduce that each time before 1.72 , now I cannot - so it seem to be nice thing with new signal hooking) :))))

If you can reproduce it easily, you could enable the debugging printfs I left in qobject_hook.h and verify it is related to this bug fix. http://lists.lazarus.freepascal.org/pipermail/qt/2009-September/001272.html

regards,

Den Jean

I think it is .... but now I cannot revert to older bindings ... no time for such tests .... new hooks done it's job definitelly.

Am Mittwoch 30 September 2009 18:49:59 schrieb Den Jean:

Hello Den Jean,

Sorry! One day bevore, i have downloaded "lclwebkit2.tar.gz". The zip-file is a helpful demo. Thanks!

Regards Th. Moritz