Cannot import PyQt4.QtGui

问题:

I have a working Python 2.6 install and just installed the PyQt4 built for Python 2.6 (available at http://www.riverbankcomputing.co.uk/software/pyqt/download). When I try to import PyQt4.QtGui I get the following error:

ImportError: DLL load failed: The specified procedure could not be found.

I'm on Windows 2k8 64-bit, but my Python install is 32-bit.

回答1:

Add the the PyQt4 directory containing Qt's applications and DLLs to your PATH environment variable. In PowerShell, provided you didn't change any of your install paths, that'd be

$env:path += ';C:\Python26\Lib\site-packages\PyQt4\bin'

回答2:

I found a solution on another forum that worked for me. I needed to copy QtGui4.dll and QtCore4.dll into the ...\Python2.7.1\Lib\site-packages\PyQt4 directory. Note, I left the original in the bin directory.

回答3:

I had installed PyQt4 from a .whl file (from the unofficial windows binaries) and got the same error.

I did what the answers suggested: checked that I installed the correct version, put my PyQt4 directory in the PATH environment variable and had QtCore4.dll and QtGui4.dll, however none of these worked.

The answer was to try and open the designer.exe program: it also had an error, but this time specified which DLL file was missing (it said msvcp140.dll is missing from your computer)

I then downloaded it off dll-files.com and put it in the PyQt4 folder (C:\Python35\Lib\site-packages\PyQt4) and it worked.

I hope this helps !

回答4:

Are you sure you installed Python x64 ? By default, the Python website makes you download the x32 version, you need to go to this page to download the x64 version and then it will work. I had the same issue and it was fixed this way. https://www.python.org/downloads/windows/

Hope that will help someone. Cheers, Chris

回答5:

If this does not works, try search for QtCore4.dll, QtGui4.dll, etc. in your paths set in PATH environment variable. In my case I found some qt dll in c:\windows\system32, caused the same error message. I've deleted the dll files, and problem solved. 'C:\Python26\Lib\site-packages\PyQt4\bin' was in my path, but that was not enough.

回答6:

Neither of the these solutions worked for me. I had Python 3.1 x64 with PyQt 4.8.2-1 x64 on my Windows 7 x64, but uninstalling them and installing the x86 versions of Python 3.1 and PyQt solved the problem for me.

回答7:

Download the program from http://www.dependencywalker.com to see if there was missing dll.

You need to point the program to the QtGui.pyd file from PyQt.

My case was using MSYS2's mingw-w64-x86_64-python3-pyqt4, it needed libpython3.5m.dll while pacman was already at python3.6

回答8:

I usage Linux ubuntu 14.04,firstly, Cannot import PyQt4.QtGui because access module PyQt4 not Available in group permission.. if call interpreter:shell>> python not available module QtGui, but if i call interpreter sudo python available QtGui.So, I solved this error , Change permisions folder package PyQt4 in my virtualenv,from property folder,change Owner and Group.

Its works for me :)

回答9:

None of these solutions worked for me with 64bit Python 3.5. I ended up rolling back Anaconda to 4.1.1 (4.2.0 uses a Qt5 by default, which may or may not be the problem). I also had to install pyqt from a python 3.5 whl - http://www.lfd.uci.edu/%7Egohlke/pythonlibs/#pyqt4.

The binary file on the Riverbank website did not work for me, possibly it only works on Python 3.4?

I have installed pyqt with Anaconda several times, and I believe if it is done correctly the PATH does not need modification (it happens as part of installation) and DLLs do not need to be copied.

回答10:

Did you verify that PyQt4 is for 32 or 64 bits?, I had the same problem I was using python 2.7.13 32 bit in Windows 10 and PyQt4 4.11 64 Bit, and changed PyQt4 for a 32 bit and it work immediately.