toto je trochu na mna zhurta ;-) Priklad by mi dost pomohol... Inak zabudol som - potrebujem pokial mozno multiplatformove riesenie. Neviem, ci som dobre pochopil odporucanie, ale na win som to skusil takto:
import ctypes, msvcrt, os leptonica = ctypes.cdll.leptonlib fp = open("phototest.tif", "r") fh = msvcrt.get_osfhandle(fp.fileno()) # get file handle for the file descriptor fd = msvcrt.open_osfhandle(fh, os.O_RDONLY) # Create a C runtime file descriptor from the file handle ofd = os.fdopen(fd, 'r') npages = leptonica.tiffGetCount(ofd) Vysledok: Traceback (most recent call last): File "<stdin>", line 1, in <module> ctypes.ArgumentError: argument 1: <type 'exceptions.TypeError'>: Don't know how to convert parameter 1 Zd. 2010/11/24 Hynek Fabian <hynek.fab...@firma.seznam.cz> > Numericky handle ziskas metodou fileno() pythoniho file objektu. > Z nej muzes dostat ceckovou FILE* strukturu libc funkci fdopen(). > > > Zdenko Podobný (Wednesday 24 November 2010 17:47:09): > > Zdravim, > > > > potrebujem v pythone robit s viacstrankovymi tiff subormi a po roznych > > testoch a googlovani som skoncil na tom, ze cisto python riesenie > > neexistuje. Najrozumnejsie sa mi javi pouzitie ctypes a kniznice > > leptonica. Problem je v tom, ze v niektorych pripadoch jej potrebujem > > posunut file object. > > > > Napr. (C kod): > > filein = "phototest.tif"; > > fp = fopen(filein, "r"); > > tiffGetCount(fp, &npages); > > fprintf(stderr, " Tiff: %d pages\n", npages); > > fclose(fp); > > > > Ked to skusim spravit v pythone, tak dostanem chybu: > > > > import ctypes > > leptonica = ctypes.CDLL("liblept.so") > > filein = "phototest.tif" > > fp = open(filein, "r") > > npages = leptonica.tiffGetCount(fp) > > Traceback (most recent call last): > > File "<stdin>", line 1, in <module> > > ctypes.ArgumentError: argument 1: <type 'exceptions.TypeError'>: Don't > know > > how to convert parameter 1 > > > > Skusal som to aj cez PyFile_AsFile ale to tiez skonci s chybou: > > >>> import ctypes as C > > >>> lib = C.CDLL("liblept.so") > > > > >>> class FILE(C.Structure): > > ... pass > > ... > > > > >>> FILE_P = C.POINTER(FILE) > > >>> C.pythonapi.PyFile_AsFile.argtypes = [C.py_object] > > >>> C.pythonapi.PyFile_AsFile.restype = FILE_P > > >>> fp = C.pythonapi.PyFile_AsFile("phototest.tif") > > >>> npages = lib.tiffGetCount(fp) > > > > Error in tiffGetCount: stream not defined > > > > Skusal som googlovat, ale sa nic funkcne sa mi nepodarilo zostavit... Vie > > mi s tym niekto pomoc? > > > > Zd. > _______________________________________________ > Python mailing list > Python@py.cz > http://www.py.cz/mailman/listinfo/python >
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