Python interacts with C + +

Version Python 2.6
IDE Microsoft Visual Studio 2008

C + + calls Python script
1.
Py_initialize () Initializes Python, both of which correspond.
Py_finalize () Clean up python

2. Import Python module
Pyobject *pmodule = Pyimport_importmodule ("Testhello");
Note: Do not Add. py, VC environment do not use test file name.
3. Get the functions within the Python script
Pyobject *pfunc = pyobject_getattrstring (Pmodule, "Hello");

4. Invoke Python function with no parameters
Pyeval_callobject (Pfunc, NULL);

5. Call python function, pass parameter
Pyobject *pargs = Py_buildvalue ("(s)", "Thank all the same");
Note: The format passed must be a tuple tuple. Which is to add (). Otherwise, the script is abnormal.

6. Process return value
Pyeval_callobject is returned after the call.
Pyobject *presult = Pyeval_callobject (Pfunc, PArgs);
Returns an integral type, using &.
int i = 0;
Pyarg_parse (PResult, "I", &i);


Returns a floating-point type
float d = 0.1f;
Pyarg_parse (PResult, "F", &d);


Returns a string
char* s = "";
Pyarg_parse (PResult, "s", &s);
Note: It is possible to write &s as s directly in C + +.
But when interacting with Python 2.6, write &s, a pointer to a pointer. Otherwise it will
Generates an exception.
7. Each pyobject* remembers to destroy with Py_decref when it is not needed.

8. Return value is tuple tuple data
The return value is list data
The return value is dict dictionary data
Pytuple_new New META Group
Pytuple_size Get tuple size
Pytuple_getitem get a single element
Pytuple_setitem Inserts a new element