[PyQt] PyQt for 64-bit Python on Windows

Phil Thompson phil at riverbankcomputing.com
Tue Feb 10 22:19:35 GMT 2009

On Tue, 10 Feb 2009 15:54:28 -0600, Dave Doty <ddoty at iastate.edu> wrote:
> I attempted to run
>     pythonw PyQt4/examples/tools/qtdemo/qtdemo.pyw
> After installing the Windows binaries for PyQt 4.4.4-2, with 64-bit
> 2.6.1, on 64-bit Windows Vista Business, and received the following error
> message:
>   Traceback (most recent call last):
>     File "qtdemo.pyw", line 28, in <module>
>       from PyQt4 import QtGui
>   ImportError: DLL load failed: %1 is not a valid Win32 application.
> I found the following mailing list thread that appears to deal with this
> issue:
>   http://www.mail-archive.com/pyqt@riverbankcomputing.com/msg15804.html
> The answer to that person's question was, "I don't see how a 64 bit
> interpreter can be expected to handle a 32 bit .pyd extension."
> I assume that this answer means, "The PyQt Windows binaries cannot be
> with the 64-bit Python interpreter. You must build PyQt yourself in order
> to
> use it with 64-bit Python 2.6.1". I attempted to do so following the
> instructions on the PyQt webpage, starting with installing SIP, using
> make, and bison under cygwin to do the compilation. However, after
> "python configure.py -p win32-g++", and running "make", I received the
> following error:
> gcc -c -O2 -w -DUNICODE -DQT_LARGEFILE_SUPPORT -I. -o main.o main.c
> gcc -c -O2 -w -DUNICODE -DQT_LARGEFILE_SUPPORT -I. -o transform.o
> transform.c
> gcc -c -O2 -w -DUNICODE -DQT_LARGEFILE_SUPPORT -I. -o gencode.o gencode.c
> gcc -c -O2 -w -DUNICODE -DQT_LARGEFILE_SUPPORT -I. -o export.o export.c
> gcc -c -O2 -w -DUNICODE -DQT_LARGEFILE_SUPPORT -I. -o heap.o heap.c
> gcc -c -O2 -w -DUNICODE -DQT_LARGEFILE_SUPPORT -I. -o parser.o parser.c
> gcc -c -O2 -w -DUNICODE -DQT_LARGEFILE_SUPPORT -I. -o lexer.o lexer.c
> g++ -mthreads -Wl,-enable-stdcall-fixup -Wl,-enable-auto-import
> -Wl,-enable-runtime-pseudo-reloc -Wl,-subsystem,console -Wl,-s -o sip.exe
> main.o transform.o gencode.o export.o heap.o parser.o lexer.o
> make[1]: Leaving directory
> `/cygdrive/c/Users/ddoty/Downloads/python/sip-4.7.9/sipgen'
> make[1]: Entering directory
> `/cygdrive/c/Users/ddoty/Downloads/python/sip-4.7.9/siplib'
> -Ic:\programs\Python26\include -o siplib.o siplib.c
> siplib.c:16:20: Python.h: No such file or directory

That would appear to be the first problem to solve - your Python
installation doesn't appear to be complete.


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