Hi,
I'm having some trouble mapping a unicode Python variable to a C
wchar_t* . I reused a MappedType directive that works flawlessy for a
C++ module. First problem: SIP generates .c files containing some C++
directives (i.e.: delete and reinterpret_cast<>). I patched gencode.c[1]
to handle C modules, but even so there are still some problems, in fact
while for C++ SIP correctly refers to "wchar_t", for C it refers to
"struct wchar_t", like here:
struct wchar_t **sipCppPtr = (struct wchar_t **)(sipCppPtrV);
and here:
sipMappedType sipMappedTypeDef_wchar_t = {
"struct wchar_t",
release_wchar_t,
forceConvertTo_wchar_t,
convertTo_wchar_t,
convertFrom_wchar_t
};
Source compiles with some warnings, but passing unicode variables to
functions has strange effects (the string changes or I get access
violations).
Is this a bug or a known limitation? Any suggestion?
I attached a test case and the gencode.c patch (against 20060325 cvs
snapshot).
Thank you for any help.
[1] This patch uses free instead of delete for mapped types in C
modules, so if you map a struct containing data that needs to be
deallocated there is no way to do it, since there is no destructor
in C.
--
Matteo Beniamino
%CModule test 0
%ModuleHeaderCode
#include "test.h"
%End
%MappedType wchar_t
{
%ConvertFromTypeCode
if (!sipCpp)
{
Py_INCREF (Py_None);
return Py_None;
}
return PyUnicode_FromUnicode(sipCpp, wcslen(sipCpp));
%End
%ConvertToTypeCode
if (sipIsErr == NULL)
return PyUnicode_Check(sipPy);
*sipCppPtr = PyUnicode_AS_UNICODE(sipPy);
return 1;
%End
};
void foo(wchar_t *);
2712a2713,2714
> char * del;
> char * cast;
2727,2729c2729,2735
< prcode(fp,
< " delete reinterpret_cast<%b *>(ptr);\n"
< , &mtd->type);
---
> if (generating_c) {
> del = " free((%b *)ptr);\n";
> } else {
> del = " delete reinterpret_cast<%b *>(ptr);\n";
> }
>
> prcode(fp, del, &mtd->type);
2747c2753,2754
< prcode(fp,
---
> if (generating_c) {
> cast =
2752c2759,2763
< " %b *sipCpp = reinterpret_cast<%b *>(sipCppV);\n"
---
> " %b *sipCpp = (%b *)(sipCppV);\n"
> "\n";
> } else {
> cast =
> "\n"
2754c2765,2771
< , &mtd -> type, (need_xfer ? "sipTransferObj" : "")
---
> "static PyObject *convertFrom_%T(void *sipCppV,PyObject *%s)\n"
> "{\n"
> " %b *sipCpp = reinterpret_cast<%b *>(sipCppV);\n"
> "\n";
> }
>
> prcode(fp, cast, &mtd -> type, (need_xfer ? "sipTransferObj" : "")
3088,3092c3105,3115
< if (need_ptr)
< prcode(fp,
< " %b **sipCppPtr = reinterpret_cast<%b **>(sipCppPtrV);\n"
< "\n"
< ,&type,&type);
---
> if (need_ptr) {
> char * cast;
>
> if (generating_c) {
> cast = " %b **sipCppPtr = (%b
> **)(sipCppPtrV);\n\n";
> } else {
> cast = " %b **sipCppPtr =
> reinterpret_cast<%b **>"
> "(sipCppPtrV);\n\n";
> }
> prcode(fp, cast, &type, &type);
> }
#!/usr/bin/env python
#-*- coding: utf-8 -*-
from distutils.core import setup, Extension
import sipdistutils
setup(
name = 'test',
ext_modules=[
Extension("test",
["test.sip", "test.c"],
include_dirs=["."]),
],
cmdclass = {'build_ext': sipdistutils.build_ext}
)
#include "test.h"
void foo(wchar_t * p){return;};
#if !defined(TEST_H)
#define TEST_H
#include<stddef.h>
void foo(wchar_t * p);
#endif
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