On Nov 4, 2:16 pm, "Mark Tolonen" <[EMAIL PROTECTED]> wrote: > "Shark" <[EMAIL PROTECTED]> wrote in message > > news:[EMAIL PROTECTED] > > >I have a windows dll1.dll with a export function: > > > int f1(char filename,char **buf,int *bufLen) > > { > > int len; > > //got the length of file anyway,such as 100 > > len = 100;//len = getLen(filename); > > *buf = (char*)calloc(100); > > *bufLen = len; > > return 0; > > } > > > then how can I call the f1 function with python. > > thanks for your response. > > Here's a quick, tested example. It's not pretty but demonstrates what you > want: > > ===== begin C DLL code ======= > #include <string.h> > #include <stdlib.h> > #include <stdio.h> > > __declspec(dllexport) > int get(const char* filename,char **buf,int *bufLen) > { > int i,len; > printf("*buf before malloc=%p\n",*buf); > len = strlen(filename); > *buf = (char*)malloc(len); > *bufLen = len; > for(i=0;i<len-1;i++) > (*buf)[i]='a'; > (*buf)[i]=0; > printf("*buf after malloc=%p\n",*buf); > return 5; > > } > > __declspec(dllexport) > void release(char* buf) > { > printf("buf[0]=%d\n",buf[0]); > printf("buf=%p\n",buf); > free(buf);} > > ===== end C DLL code ======= > > ===== begin Python code ======= > from ctypes import * > x = CDLL('x.dll') > x.get.argtypes=[c_char_p,POINTER(POINTER(c_byte)),POINTER(c_int)] > buf = POINTER(c_byte)() > length = c_int() > print x.get("hello.txt",byref(buf),byref(length)) > print repr(string_at(buf,length)) > buf[0]=55 # change first byte > x.release.argtypes=[POINTER(c_byte)] > x.release(buf) > ===== end Python code ======= > > sample output: > > *buf before malloc=00000000 > *buf after malloc=00C92940 > 5 > 'aaaaaaaa\x00' > buf[0]=55 > buf=00C92940 > > -Mark
thank you, Mark. I got it. -- http://mail.python.org/mailman/listinfo/python-list
