Recreating a char array from a pointer

[Thomas Heller]

buffinator schrieb:
> I have an application that has to send a string as a pointer to memory, 
> and then another one that has to retriece it and fetch the string. 
> Converting the string to an array and sending the pointer was easy
> 
> import array
> a=array.array("c","mytextgoeshere")
> my_pointer = a.buffer_info()[0]
> 
> 
> But then I tried to get the data back... and I just can't find out how. 
> I ended up writing a C module for this that works fine in linux, but 
> this application is meant for windows and I just can't get C-modules to 
> compiler there correctly since I suck at windows.
> 
> The relevant code from the module is
> 
> static PyObject *
> pointrtostr_casttostr(PyObject *self, PyObject *args)
> {
>      char *mystr;
>      long int p;
> 
>      if (!PyArg_ParseTuple(args, "l", &p))
>        return NULL;
> 
>      mystr = (char*)p;
>      return Py_BuildValue("s", mystr);
> }
> 
> My question is... can I do the above code in python without involving C 
> since it is quite a big hassle to have to go through the module building 
> in windows? :/

You can use the ctypes package for this.  It is in the standard library in Python 2.5,
for older versions it is a separate download.

Thomas