[PyQt] Passing image using SIP

[Jarosław Białas]

Hello,

I wanted to create code fragment that will pass an object containg image 
or pointer to this object from Python to C++ function.

I tried to create function:
void loadImage(QImage* image);
Then I created sip file, and after compiling and linking everything 
looks fine until I tried to import shared library in python:

ImportError: ./test.so: undefined symbol: _ZTI6QImage

I am open to any suggestion how to solve that problem.

Jaroslaw


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[PyQt] PyQt Custom user types with QVariants and QMetaTypes

[Justin Rosen]

Hey all,

I've been struggling the past few days with trying to wrap my mind around
how PyQt has implemented QVariants and QMetaTypes.  In short I'm trying to
register/declare a custom user type that will be picked up by
QItemEditorFactory.

I've found a few postings related to the topic, but have been unable to get
a working example.  I'm using Qt 4.6.1 and PyQt 4.7.2 on Linux Red Hat
Enterprise 5.5

The FAQ clearly states that this is doable: "Can I store a python object
reference in a 
QVariant?"
And the original thread covering the issue in the FAQ: Construct QVariant
from object of user
type
.

I'm able to store a python object on a QVariant and get the object back, For
example the following class Triplet:
>>> class Triplet:
...def __init__(self):
...self.first, self.second, self.third = (-1, -1, -1)

>>> t = Triplet()
>>> tv = QtCore.QVariant(t)
>>> assert tv.toPyObject() is t
True

But I can't seem to derive the type/userType as being a Triplet.  Comes back
as PyQt_PyObject and UserType:
>>> tv.type()
127
>>> tv.typeName()
'PyQt_PyObject'
>>> tv.typeToName(tv.type())
'UserType'
>>> tv.userType()
260
>>> tv.typeToName(tv.userType())
'PyQt_PyObject'

What am I doing wrong?  The FAQ says that new python types are automatically
registered, but I keep getting the same PyObject type.
"The QVariant() ctor will now register new Python types automatically. I've
also wrapped QMetaType.type() and overloaded it so that you can pass a
Python type. I think this is enough for what you need."

In a previous post Matt Newell posted some code that achieves this, but I'm
assuming this has been superseded by integration with sip?:
>>> class A: pass
>>> metaTypeId = registerPythonQMetaType(A)
>>> print metaTypeId
424
>>> qv = qvariantFromPyObject(A())
>>> qv

>>> qv.userType()
424
>>> print qv.typeName()
A
>>> pyObjectFromQVariant(qv)
<__main__.A instance at 0xb65391ec>

Thanks, any help would be greatly appreciated!
Justin
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Re: [PyQt] sipConvertFromSliceObject() macro incompatible with Python 3.2

[Arfrever Frehtes Taifersar Arahesis]

2011-06-20 18:45:25 Arfrever Frehtes Taifersar Arahesis napisał(a):
> sipConvertFromSliceObject() macro is incompatible with Python 3.2.
> Please see comment #0 in:
> https://bugs.gentoo.org/show_bug.cgi?id=365549
> 
> The patch for SIP:
> https://365549.bugs.gentoo.org/attachment.cgi?id=271739

It might be appropriate to also update some code in siplib/voidptr.c.
I'm attaching updated patch.

-- 
Arfrever Frehtes Taifersar Arahesis
--- siplib/sip.h.in
+++ siplib/sip.h.in
@@ -1553,9 +1553,15 @@
 
 #define sipIsExactWrappedType(wt)   (sipTypeAsPyTypeObject((wt)->type) == (PyTypeObject *)(wt))
 
+#if PY_VERSION_HEX >= 0x0302
+#define sipConvertFromSliceObject(o,len,start,stop,step,slen) \
+PySlice_GetIndicesEx((o), (len), (start), (stop), \
+(step), (slen))
+#else
 #define sipConvertFromSliceObject(o,len,start,stop,step,slen) \
 PySlice_GetIndicesEx((PySliceObject *)(o), (len), (start), (stop), \
 (step), (slen))
+#endif
 
 
 /*
--- siplib/voidptr.c
+++ siplib/voidptr.c
@@ -429,7 +429,11 @@
 {
 Py_ssize_t start, stop, step, slicelength;
 
+#if PY_VERSION_HEX >= 0x0302
+if (PySlice_GetIndicesEx(key, v->size, &start, &stop, &step, &slicelength) < 0)
+#else
 if (PySlice_GetIndicesEx((PySliceObject *)key, v->size, &start, &stop, &step, &slicelength) < 0)
+#endif
 return NULL;
 
 if (step != 1)
@@ -486,7 +490,11 @@
 {
 Py_ssize_t stop, step;
 
+#if PY_VERSION_HEX >= 0x0302
+if (PySlice_GetIndicesEx(key, v->size, &start, &stop, &step, &size) < 0)
+#else
 if (PySlice_GetIndicesEx((PySliceObject *)key, v->size, &start, &stop, &step, &size) < 0)
+#endif
 return -1;
 
 if (step != 1)


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[PyQt] sipConvertFromSliceObject() macro incompatible with Python 3.2

[Arfrever Frehtes Taifersar Arahesis]

sipConvertFromSliceObject() macro is incompatible with Python 3.2.
Please see comment #0 in:
https://bugs.gentoo.org/show_bug.cgi?id=365549

The patch for SIP:
https://365549.bugs.gentoo.org/attachment.cgi?id=271739

-- 
Arfrever Frehtes Taifersar Arahesis


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[PyQt] Suggestion for wrapping std::tr1::shared_ptr<>

[Shen, Guobao]

Hi, Phil and everyone,
It is great to find this mailing list.
I am recently starting to use SIP to expose a C++ app, which makes heavy 
use of std::tr1::shared_ptr.

I hit some problems to wrap them in SIP. Here is my example:

class FooA;
typedef std::tr1::shared_ptr a_ptr;

class FooA : public std::tr1::enable_shared_from_this {
public:
typedef std::tr1::shared_ptr shared_pointer;
  ...
}

class FooB: {
public:
a_ptr method1(std::string name, a_ptr pointer) const;
...
}

How should I wrap them in SIP? Is there some code in PyQt that I can 
look at?


Thanks,

Guobao

--
Guobao Shen
Bldg. 902-B, 17 Cornell Avenue
National Synchrotron Light Source II
Brookhaven National Laboratory
Upton, New York 11973
Tel.: +1 (631) 344 7540
Fax.: +1 (631) 344 8085
http://www.bnl.gov/nsls2


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