Alternate string object type for PyStringObject(available Python 2.x) in python 3.x?

[MathanK]

What is the replacement in python 3.x for PyStringObject which is available in 
python 2.x?
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Is there conversion method to convert pyunicodeobject to pybyteobject?

[MathanK]

Hi All,

A variable whose data type is PyUnicodeObject is to be assigned to varioable of 
PyBytesObject type 

example :

PyUnicodeObject *p = ...whatever...; 
function( (PyByteObject*p)); 

compiled and got a Bus Error.

Cheers,
Mathan
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Getting System error with PyModule_AddIntConstant funtion

[MathanK]

Following is a Python C api which runs properly without PyModule_AddIntConstant 
function. 


But when PyModule_AddIntConstant() function is used, getting the following 
error when i call 
c. path("test call");
" SystemError: NULL result without error in PyObject_Call "


Python C api- c.c


int test(int a){
 return (2*a+a);
 }
 

 PyObject* dict = NULL;
 

 static PyObject* path(PyObject* self, PyObject* args) {
 char *cpath;
 PyUnicodeObject *path;
 PyUnicodeObject *test; 
 

 if (!PyArg_ParseTuple(args, "s", &path))
return NULL; 
 cpath = (char *)path; 
 test = (PyUnicodeObject*)(cpath); 
 PyObject *testDict = PyDict_New();
 int testVal = PyDict_SetItem(testDict, (PyObject 
*)PyUnicode_FromString(cpath), (PyObject *)PyUnicode_FromString(cpath));
  
 return Py_BuildValue("s", test);
 }
 static PyObject* c(PyObject* self, PyObject* args) {
 
 int a;
 int result;
if(!PyArg_ParseTuple(args, "i", &a))
 return NULL;
 result = test(a);
 return Py_BuildValue("i", result);
  
 }
 

 static PyMethodDef cmethods[] = {
 {"c", c, METH_VARARGS, "watch"},
 {"path", path, METH_VARARGS, "test"},
 {NULL, NULL, 0, NULL},
 };
 

 static struct PyModuleDef c_Module = {
 PyModuleDef_HEAD_INIT,
 "c",
 (
   "Interface."
 ),
 -1,
 cmethods
 };
 

 PyMODINIT_FUNC PyInit_c(void) {
  
 PyObject* obj = PyModule_Create(&c_Module);
 long lon1 = 0;
 PyModule_AddIntConstant(obj, "test", lon1);
 
 }
 

 int main(int argc, wchar_t *argv[])
 {
 PyImport_AppendInittab("c", PyInit_c);
 Py_SetProgramName(argv[0]);
 Py_Initialize();
 PyImport_ImportModule("c");
 return 0;
 }
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Re: Getting System error with PyModule_AddIntConstant funtion

[MathanK]

I checked for Null also. But No change in the result. Still getting the system 
error.
But when i m calling only c.c(5) function and not calling c.path("hi python c 
api") function, i m getting proper output without any system error.
Any clue? 
 
 Subject: Re: Getting System error with PyModule_AddIntConstant funtion
 From: Philip Semanchuk <phi...@semanchuk.com>
 Date: Tue, 18 May 2010 11:50:46 -0400
 To: "python-list (General)" <python-list@python.org>
 
 - Contents -
 
 
 On May 18, 2010, at 11:41 AM, MathanK wrote: 
 
 > Following is a Python C api which runs properly without 
 > PyModule_AddIntConstant function. 
 > 
 > 
 > But when PyModule_AddIntConstant() function is used, getting the 
 > following error when i call 
 > c. path("test call"); 
 > " SystemError: NULL result without error in PyObject_Call " 
 
 Hi Mathan, 
 You're not checking the return code from PyModule_Create(). Is it 
 returning NULL? 
 
 Also, there's a list specific to Python's C API. You might get a 
 better response to your question there: 
 http://mail.python.org/mailman/listinfo/capi-sig 
 
 
 bye 
 Philip 
 
 
 > 
 > 
 > Python C api- c.c 
 > 
 > 
 > int test(int a){ 
 > return (2*a+a); 
 > } 
 > 
 > 
 > PyObject* dict = NULL; 
 > 
 > 
 > static PyObject* path(PyObject* self, PyObject* args) { 
 > char *cpath; 
 > PyUnicodeObject *path; 
 > PyUnicodeObject *test; 
 > 
 > 
 > if (!PyArg_ParseTuple(args, "s", &amp;path)) 
 > return NULL; 
 > cpath = (char *)path; 
 > test = (PyUnicodeObject*)(cpath); 
 > PyObject *testDict = PyDict_New(); 
 > int testVal = PyDict_SetItem(testDict, (PyObject 
 > *)PyUnicode_FromString(cpath), (PyObject 
 > *)PyUnicode_FromString(cpath)); 
 > 
 > return Py_BuildValue("s", test); 
 > } 
 > static PyObject* c(PyObject* self, PyObject* args) { 
 > 
 > int a; 
 > int result; 
 > if(!PyArg_ParseTuple(args, "i", &amp;a)) 
 > return NULL; 
 > result = test(a); 
 > return Py_BuildValue("i", result); 
 > 
 > } 
 > 
 > 
 > static PyMethodDef cmethods[] = { 
 > {"c", c, METH_VARARGS, "watch"}, 
 > {"path", path, METH_VARARGS, "test"}, 
 > {NULL, NULL, 0, NULL}, 
 > }; 
 > 
 > 
 > static struct PyModuleDef c_Module = { 
 > PyModuleDef_HEAD_INIT, 
 > "c", 
 > ( 
 > "Interface." 
 > ), 
 > -1, 
 > cmethods 
 > }; 
 > 
 > 
 > PyMODINIT_FUNC PyInit_c(void) { 
 > 
 > PyObject* obj = PyModule_Create(&amp;c_Module); 
 > long lon1 = 0; 
 > PyModule_AddIntConstant(obj, "test", lon1); 
 > 
 > } 
 > 
 > 
 > int main(int argc, wchar_t *argv[]) 
 > { 
 > PyImport_AppendInittab("c", PyInit_c); 
 > Py_SetProgramName(argv[0]); 
 > Py_Initialize(); 
 > PyImport_ImportModule("c"); 
 > return 0; 
 > }
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Re: Is there conversion method to convert pyunicodeobject to pybyteobject?

[MathanK]

Got it worked with the following change.

PyUnicodeObject *p = ...whatever...;

char* tmp = (char *)p;
PyObject* arg = PyBytes_FromString (tmp); 

function( (PyBytesObject*) arg); 


>From : MathanK<switch2mat...@gmail.com>
To : "python-list" <python-list@python.org>
Date : Sat, 15 May 2010 02:50:22 -1200
Subject : Is there conversion method to convert pyunicodeobject to pybyteobject?

Hi All,

A variable whose data type is PyUnicodeObject is to be assigned to varioable of 
PyBytesObject type 

example :
void function( (PyBytesObject* byte){} 
PyUnicodeObject *p = ...whatever...; 
function( (PyBytesObject*)p); 

compiled and got a Bus Error.

Cheers,
Mathan
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