[QScintilla] Python SendScintilla with a pointer

[VA]

Hello,

I'm not sure this is the right mailing list, so direct me if I'm not on
the right one.

I'm using Python 2, PyQt 5.6 and the Python bindings of QScintilla.
I need to get the styled text of an annotation, but unfortunately,
QScintilla (and moreover the Python bindings) does not have a wrapper
for SCI_ANNOTATIONGETSTYLES, so I'm trying to wrap it myself in Python.

For easier testing purpose, I first tried to wrap myself
SCI_ANNOTATIONGETTEXT, which is wrapped by annotation(), so I can adapt
the QScintilla C++ code to Python:

bufsize = self.SendScintilla(self.SCI_ANNOTATIONGETTEXT, line, 0L) + 1
buf = ctypes.create_string_buffer(bufsize)
addr = ctypes.addressof(buf)
self.SendScintilla(self.SCI_ANNOTATIONGETTEXT, line, ptr)
return buf.value

But the second SendScintilla call segfaults on my machine. I delved and
found that on my machine (32 bits OS), for small bufsize (if <= 16),
addr is a Python 'long', as it is between 1<<31 and 1<<32.

When the segfault, here's what the gdb backtrace starts with:

#0  __memcpy_sse2_unaligned () at
../sysdeps/i386/i686/multiarch/memcpy-sse2-unaligned.S:668
#1  0xb035d6ff in Editor::BytesResult (lParam=-1, val=0x89eca50 "aaaa1",
len=4) at ../src/Editor.cpp:5330
#2  0xb03628e9 in Editor::WndProc (this=0x882cb70, iMessage=2541,
wParam=0, lParam=-1) at ../src/Editor.cpp:7381
#3  0xb038ae2c in ScintillaBase::WndProc (this=0x882cb70, iMessage=2541,
wParam=0, lParam=-1) at ../src/ScintillaBase.cpp:1067
#4  0xb0270f36 in QsciScintillaQt::WndProc (this=0x882cb68,
iMessage=2541, wParam=0, lParam=-1) at ScintillaQt.cpp:176
#5  0xb02376b1 in QsciScintillaBase::SendScintilla (this=0x883f428,
msg=2541, wParam=0, lParam=-1) at qsciscintillabase.cpp:171

The reason can be clearly seen with lParam equal to -1, while it should
be equal to the address I passed. If I wrap "addr" in a sip.voidptr, the
segfault is the same, with lParam still equal to -1.

So for reasons beyond my understanding, lParam has been erroneously
converted to -1, even when using a sip.voidptr. I noticed the QScintilla
Python bindings accept Python 'int' but not Python 'long'.

I don't know whether it's sip or the QScintilla Python bindings which
should be fixed but there is a problem.

Thanks