En Wed, 21 Mar 2007 03:35:09 -0300, John Pye <[EMAIL PROTECTED]> escribió:
> Gabriel, if you think you can make an example that works, that would
> be great. I'm afraid I feel a bit out of my depth and don't have much
> confidence in this idea.
Try this. It's based on the example_nt extension module.
--- begin example.c ---
#include <io.h>
#include <fcntl.h>
#include <stdio.h>
#include <windows.h>
#include "Python.h"
static void externalfunction(FILE* f)
{
// This is a "fake" external function that receives a FILE*
printf("In externalfunction\n");
fprintf(f, "Hello from externalfunction!\n");
}
static void wrapper(DWORD osfhandle)
{
// This is a wrapper around externalfunction; receives an OS handle
// for an open file, builds a FILE structure, and calls externalfunction
FILETIME lw;
SYSTEMTIME st;
FILE* f;
// This call is just to show that osfhandle is actually a Windows handle
// as if one had used CreateFile(...) by example
printf("Using osfhandle with GetFileTime\n");
GetFileTime((HANDLE)osfhandle, NULL, NULL, &lw);
FileTimeToSystemTime(&lw, &st);
printf("LastWrite %d-%d-%d %02d:%02d:%02d.%03d\n", st.wYear, st.wMonth,
st.wDay, st.wHour, st.wMinute, st.wSecond, st.wMilliseconds);
// Now build a FILE struct from the received handle
f = fdopen(_open_osfhandle(osfhandle,_O_APPEND),"a");
externalfunction(f);
fflush(f); // ensure all buffers are written
}
static PyObject *
filetest(PyObject *self, PyObject *args)
{
DWORD handle;
if (!PyArg_ParseTuple(args, "I", &handle))
return NULL;
printf("Received handle: %d\n", handle);
wrapper(handle);
printf("Done\n");
Py_INCREF(Py_None);
return Py_None;
}
static PyMethodDef example_methods[] = {
{"filetest", filetest, 1, "filetest doc string"},
{NULL, NULL}
};
void
initexample(void)
{
Py_InitModule("example", example_methods);
}
--- end example.c ---
--- begin test.py ---
f = open("output.txt","w")
f.write("Hello from python!\n")
# ensure all buffers are written before calling the external function
f.flush()
import msvcrt
fh = msvcrt.get_osfhandle(f.fileno())
print "handle=",fh
import example
# calling example.filetest using the OS handle
example.filetest(fh)
f.close()
f = open("output.txt","r")
print "output.txt:"
print f.read()
f.close()
--- test.py ---
Build example.dll and rename it example.pyd; copy test.py to the same
directory.
Running test.py gives:
C:\APPS\Python24\PYTHON~1.2\TEST_M~1\Release>python24 test.py
handle= 1988
Received handle: 1988
Using osfhandle with GetFileTime
LastWrite 2007-3-23 04:25:08.000
In externalfunction
Done
output.txt:
Hello from python!
Hello from externalfunction!
--
Gabriel Genellina
--
http://mail.python.org/mailman/listinfo/python-list
