"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
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