Message QWindowsNativeInterface::nativeResourceForWindow: 'handle' requested for null window or window without handle.

INeedMySpace

Hi! I recently migrated to Qt5 on Windows and run small app with main window and several widgets (childs of QVideoWidget) and custom dialogs.
Sometimes I got this messages in console (then I exec dialog for example)
@QWindowsNativeInterface::nativeResourceForWindow: 'handle' requested for null window or window without handle.@

It doesn't seem to affect my app but I'm curious what it means and is there some hidden faults?

maitai

Here too, plenty of this message in the console since I upgraded to QT5... No idea what it means and how to get rid of it...

agarny

I have just upgraded to Qt 5.0.1 and I am now getting those messages too while I didn't at all with Qt 5.0.0...?!

xiit

I get the same messages, also using 5.0.1.

DBGTMaster

Is there a solution available?

DBGTMaster

I found my problem, the tcpserver and tcpclient has different qdatastream versions...

qdatastream::setVersion solves my problem

TorbenD

Hmm, how is the QDataStream related to window handling?

I have the same problem:
Win 8 Pro 64 bit, MSVC2012, Qt 5.0.1 commercial.

irfan.omair

Can you guys let me know how I can reproduce it at my end? any example or QTDIR\qtbase\ example ??
Any certain steps ??

Any hint or stack trace which can give any clue?

TorbenD

I can't give you a Qt example programm causing this problem (havent' compiled the examples) but I can you give a small programm that shows the error. it is a autoupdater library for qt based programms, based on the poject "flevor" together with the mentioned small example programm to show the effect.

There are only two disadvantages: It depends on QuaZIP, a Qt wrapper for zLib/minizip. And it suffers the QtWebkit bug described here: http://qt-project.org/forums/viewthread/23571

If you are interested please give me a note and I will send you the files.

Torben

skorodum

I also can confirm. Tested with official builds for both mingw 4.7.2 and MSVC 2010.
One message for each control (QWidget child?).

irfan.omair

[quote author="TorbenD" date="1360329674"]I can't give you a Qt example programm causing this problem (havent' compiled the examples) but I can you give a small programm that shows the error. it is a autoupdater library for qt based programms, based on the poject "flevor" together with the mentioned small example programm to show the effect.

There are only two disadvantages: It depends on QuaZIP, a Qt wrapper for zLib/minizip. And it suffers the QtWebkit bug described here: http://qt-project.org/forums/viewthread/23571

If you are interested please give me a note and I will send you the files.

Torben[/quote]

Yes sure if it is not too big example and if I can easily see the behavior then yes please let me know how I can get that code.

omichel

Same problem here with Qt 5.0.1 for mingw on Windows 7 64bit...

artem_pisarenko

Same problem. Qt 5.0.1 mingw (official build from downloads), win7 64bit.

xisuosunboy

只要创建widget,就是一大堆QWindowsNativeInterface::nativeResourceForWindow: 'handle' requested for null window or window without handle.

自带的示例也是一样的.不知道是不是qt5.0.1的问题?
QT5.0.1 win7 32bit ming/vs2010 (official build)都是!

Just create widget, that is a lot of "QWindowsNativeInterface::nativeResourceForWindow: 'handle' requested for null window or window without handle."

QT Example has the same problem in QT5.0.1!
QT5.0.1 win7 32bit mingw4.7/vs2010 (official build)

irfan.omair

[quote author="xisuosunboy" date="1360592779"]只要创建widget,就是一大堆QWindowsNativeInterface::nativeResourceForWindow: 'handle' requested for null window or window without handle.

QT Example has the same problem in QT5.0.1!
QT5.0.1 win7 32bit mingw4.7/vs2010 (official build)[/quote]

Can you please point me which example and what steps required to see this , i just ran few widget based example and dont see this.

omichel

It seems you should compile in "debug" mode as in "release" mode, I do no get these messages.

xisuosunboy

[quote author="irfan.omair" date="1360629199"]
[quote author="xisuosunboy" date="1360592779"]只要创建widget,就是一大堆QWindowsNativeInterface::nativeResourceForWindow: 'handle' requested for null window or window without handle.

QT Example has the same problem in QT5.0.1!
QT5.0.1 win7 32bit mingw4.7/vs2010 (official build)[/quote]

Can you please point me which example and what steps required to see this , i just ran few widget based example and dont see this.

[/quote]

"Application Example",When you click to "open" or "save",then there will a lot of "QWindowsNativeInterface::nativeResourceForWindow: 'handle' requested for null window or window without handle."

Whether in "debug" or "release",this problem occurs.

xisuosunboy

When in windows2003 .QT5.0.1 32bit mingw4.7 (official build)

“Application Example”,When you click to “open” or “save”,then there one message like this "CoCreateInstance failed (在活动的激活上下文中没有找到任何查找密钥。)"

irfan.omair

Alright, so it seems it is coming up when you are actually trying to show native dialog. Let me try to reproduce it here

xisuosunboy

[quote author="irfan.omair" date="1360695750"]Alright, so it seems it is coming up when you are actually trying to show native dialog. Let me try to reproduce it here[/quote]

Did you able to reproduce this problem?Or the problem is only my case.