"_Z9qBadAllocv could not be located in the dynamic link library QtCore4.dll"

hahi-x

hmm, so from beginning: :-D

I installed Qtcreator on my Windows Pc.

After this I watched this youtube Video:
http://www.youtube.com/watch?v=QLT7oEt6gLE&feature=player_profilepage

I did exactly the same like in this Video.

When I press the green button in QtCreator it works fine.

The I opened the Folder "...\interactiveHelloWord-build-desktop\debug"
and found the "interactiveHelloWord.exe".
when I start these .exe file I get an Error-Message wich says "_Z9qBadAllocv" was not found in DLL "QtCore4.dll"

In German the message says: "Der Prozedureinsprungspunkt "_Z9qBadAllocv" wurde in der DLL "QtCore4.dll" nicht gefunden.

sfilippidis

I make the hypothesis that PATH in your machine is pointing at the wrong dll files!

hahi-x

That could be possible but where do I check and change it?

sfilippidis

To begin with, open a command prompt (Start-->Run-->type cmd and enter) and give the command

path

hahi-x

In command promt the path is "C:\Users\Der Lars"

sfilippidis

You need to add to the current path the location of Qt-dll files (the development ones!).

redkite

I think you missunderstood Stavros Filippidis, please execute the command path in your command prompt and paste here the result.

exemple :
@C:>path
PATH=c:\Program Files\Microsoft Visual Studio 10.0\Common7\IDE;c:\Program Files...@

sfilippidis

[quote author="redkite" date="1311077608"]I think you missunderstood Stavros Filippidis, please execute the command path in your command prompt and paste here the result.

exemple :
@C:>path
PATH=c:\Program Files\Microsoft Visual Studio 10.0\Common7\IDE;c:\Program Files...@[/quote]

Yes, your hypothesis makes sense! :-)

hahi-x

C:\Users\Der Lars>path
PATH=C:\msys\bin;C:\MinGW\bin;C:\Windows\system32;C:\Windows;C:\Windows\System32
\Wbem;C:\Program Files\CyberLink\Power2Go;C:\Windows\System32\WindowsPowerShell
v1.0;C:\Boost\lib;C:\Qt\4.5\bin

C:\Users\Der Lars>

Was it correct?

redkite

bq. Was it correct?

Yes, thank you.

Normally, your problem is that your executable is looking after QtCore.dll and QtGui.dll (may be more) and it is finding wrong one in C:\Qt\4.5\bin (the last item in your path list).

You can try to launch your application after you have added C:\Qt\4.5\lib at the beginning of your PATH. (help for updating your PATH variable : "How to":http://www.computerhope.com/issues/ch000549.htm)

Have you several Qt version installed on your computer? If so, which one are you using for building your app in QtCreator? (you can check it by opening your project in QtCreator and click on "Project" in the left area)

hahi-x

I changed C:\Qt\4.5\bin to C:\Qt\4.5\lib.

But it doesn´t help. :-(

Yesterday I downloadet my Version of Qtcreator. So I hope it is the newest. ;-)
It is Qt 4.7.3

giesbert

If you compile with Qt 4.7.3, you also have to use the dlls of 4.7.3.

hahi-x

But where do I find the dll´s of 4.7.3? ;-)

oh I found this directory on my pc. "C:\QtSDK\Desktop\Qt\4.7.3\mingw\bin"

redkite

[quote author="Gerolf" date="1311079790"]If you compile with Qt 4.7.3, you also have to use the dlls of 4.7.3.[/quote]

Yes, of course. Try to find where is located your new 4.7.3 dll and add the path to their folder in your PATH. You must put it before any 4.5.3 folders, otherwise your application will try to launch will olds dll ...

redkite

[quote author="hahi-x" date="1311080087"]But where do I find the dll´s of 4.7.3? ;-)
[/quote]

Search into your c:\Qt folder, is there a SDK folder or anything? you can search QtCore4.dll using your search file from Windows, and you will see where are all your dll folders

hahi-x

Woow, it works. :-D

I changed the directory "C:\Qt\4.5\lib" to "C:\QtSDK\Desktop\Qt\4.7.3\mingw\bin".

:-D Oh I´m so happy :-D

Thank´s to everyone and have a nice day. :-)

redkite

You're welcome ;-)

sfilippidis

[quote author="Stavros Filippidis" date="1311073454"]To begin with, where did you copy these dll files from? Be aware that the dll files used by Qt Creator are NOT the one you executable is linked against! One simple way to check it is the fact that Qt-dll files of Qt Creator are 4.7.4 version, and the proper Qt-dll you link against (reside in another folder) are 4.7.3 version. ;-)

However, you should not copy the dll files in the Release folder! :-)[/quote]

So, it was what I told @hahi-x 2 hours ago in the quoted text! ;-)

You should know that Qt-dll files in folder C:\QtSDK\QtCreator\bin are for use from Qt Creator! I suppose this is why their version is higher (4.7.4)! The Qt-dll files that YOUR (desktop) executable is meant to link against are in the folder C:\QtSDK\Desktop\Qt\4.7.3\mingw\bin (and their version is 4.7.3). :-)

giesbert

The easiest way would be put the correct dlls directly beside your executable and it should always work, regardeless of the path variable...

p91paul

[quote author="Gerolf" date="1311089904"]The easiest way would be put the correct dlls directly beside your executable and it should always work, regardeless of the path variable...[/quote]

and, most important thing, if you put dlls in your executable directory you are ready to distribute your application: if you send only your .exe to someone else, he will have the same problem; instead, if you distribute the whole directory with dll files, everything will work without having to install or set anything.