[Pyobjc-dev] strange behavior?

[Duane R. <bai...@gm...>]

I wrote a quick wrapper to get an TIFFRepresentation from a 1d list, a
width, and a height. Sadly, I ran into two problems:

1. it is returned in a tuple.
2. when I extract it from the tuple, I can't call methods (I tried length)
because of the missing variable 'self'.

here's the code:

#import <Python.h>
#import "pyobjc-api.h"
#import <Cocoa/Cocoa.h>

// example usage
// getbitmap([1 2 3 4], 2, 2, 1, colorspace) # creates a grascale, 2x2
NSBitMapImageRep

static PyObject *get_bitmap(PyObject *self, PyObject *args) // def
getbitmap(data, width, height, ipp, colorspace):
{
  unsigned char *data;
  PyObject *dataList, *newwidth, *newheight, *newipp, *intObject,
*colorspace;
  long listSize = -1, i = 0, width = 0, height = 0, ipp = 3;
  BOOL alpha;
  NSBitmapImageRep *rep;
  NSData *tiff;
  NSString *colorString;
  if (!PyArg_ParseTuple(args, "O!ii", &PyList_Type, &dataList, &width,
&height)) return NULL;

  listSize = PyList_Size(dataList);

  if(width * height * ipp != listSize)
  {
    PyErr_Format(PyExc_ValueError, "The list size does not agree with the
other arguments!");
    PyErr_Print();
    return Py_None;
  }

  if (listSize < 0)
  {
    PyErr_Format(PyExc_TypeError, "First argument must be a list with
entries!");
    PyErr_Print();
    return Py_None;
  }

  data = malloc(sizeof(unsigned char) * listSize);
  for (i = 0; i < listSize; i++)
  {
    intObject = PyList_GetItem(dataList, i);
    if(!PyInt_Check(intObject))
    {
      PyErr_Format(PyExc_TypeError, "Entry %d of list is not an integer!",
i);
      PyErr_Print();
      return Py_None;
    }
    data[i] = (unsigned char)PyInt_AsUnsignedLongMask(intObject);
  }
  // So, now we have our DATA! :D

  alpha = (ipp == 4) ? YES : NO;

  rep = [[NSBitmapImageRep alloc] initWithBitmapDataPlanes: &data
                                  pixelsWide: width
                                  pixelsHigh: height
                                  bitsPerSample: 8
                                  samplesPerPixel:ipp
                                  hasAlpha: alpha
                                  isPlanar: NO
                                  colorSpaceName: NSDeviceRGBColorSpace
                                  bytesPerRow: width * ipp
                                  bitsPerPixel: ipp * 8];
  tiff = [rep TIFFRepresentation];

  return PyObjC_ObjCToPython(@encode(NSData), tiff);
}

static PyMethodDef methods[] = {
    {"getbitmap",  get_bitmap, METH_VARARGS,
     "Get an NSBitmapImageRep"},
    {NULL, NULL, 0, NULL}
};

PyObject *mod;

PyMODINIT_FUNC initbitmap()
{
  mod = Py_InitModule("bitmap", methods);
  PyObjC_ImportAPI(mod);
}