On 5 Jun., 01:32, "Gabriel Genellina" <[EMAIL PROTECTED]> wrote: > En Mon, 04 Jun 2007 11:58:38 -0300, <[EMAIL PROTECTED]> escribió: > > > > > > > Onwards to the problem, I have been having difficulty embedding a > > python module into my C/C++ program. (just a test program before > > moving on into the real thing). I have been making test runs using the > > codes fromhttp://docs.python.org/ext/pure-embedding.htmlas a basic, > > but modifiying it now as a function inside my C/C++ code. > > > Problem started when I started passing an array as an argument. The > > module also need an array as an argument, but somehow I can't make > > them to go pass the "input-error checking" of the module. > > > The code for argument building and calling are as follows: > > > void CallSnake(char ModName[], char FuncName[], double result[]) > > { > > ... > > /*Some operations to import modname, and preping FuncName, all is > > ok*/ > > ... > > /*Processing the result array and calling the function, problem > > time*/ > > pArgs = PyTuple_New(MAX_ELEMENT); > > Should check for a NULL return value. > > > pArg = PyList_New(1); > > Same here. > > > for (i = 0; i < MAX_ELEMENT; ++i) > > { > > pValue = Py_BuildValue("d", result[i]); > > I'd use PyFloat_FromDouble here. > > > PyTuple_SetItem(pArgs, i, pValue); > > > if (!(*pArgs).ob_refcnt) > > What do you expect from this? pArgs is a newly created tuple - unless you > DECREF it explicitely, ob_refcnt should never be 0. (Also, the -> operator > exists for exactly this usage). > > > PyList_SetItem(pArg, 0, pArgs); > > pValue = PyObject_CallFunctionObjArgs(pFunc,pArg,NULL); > > You didn't show us how you got pFunc here. Just to make it clear, you are > calling pFunc with a single argument, which is a list that contains a > single element, which is a tuple containing exactly MAX_ELEMENT float > objects. > > > Traceback > > if x.ndim != 1; /*x is the input array, checking if it's a 1D*/ > > AttributeError: 'list' object has no attribute 'ndim' > > Python lists don't have a ndim attribute. Perhaps you want some kind of > Numeric array? (ndarray?) > > > I have been trying many call variations, but alas, I think the problem > > lies in the list building process. I have no problems calling a non- > > arrayed (albeit,still single) argument. > > Yes, it appears that you are building a plain list but your code is > expecting another kind of object. I'm unfamiliar with Numeric arrays, if > that is what you need; perhaps someone else can help, or ask again in a > Numeric-specific list. > > -- > Gabriel Genellina- Zitierten Text ausblenden - > > - Zitierten Text anzeigen -
yeah, i was looking at am array full of numbers. import numpy,scipy, maybe pylab too while i was testing out the function over at a python shell, make a linspace, sin it, and then call the function (which also is from the scipy cookbook). Is numeric arrays (or ndarray) unlike normal listing then? Since I started off programming in C, I am having a bit of a confusion identifiying the different type of arrays, listing and tuples and such... (since it's just "build an array of type so and so, and pass it over" ^^;;) the reason i didn't show pFunc is that because it is the result of operations done to FuncName (ModName = module to be imported, FuncName = function to be called), therefore i feel it would be a bit waste of time/space to put in the pFunc function, since I didn't change the operations concerning pFunc other than changing argv[1] to FuncName from the link i gave (and not the core of my problem). so yeah, maybe I am building and passing the array/calling the function the wrong way... will have to take a look at numpy/numerical specific C API and stuff now thanks for your time and the help
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