Grigory Petrov grigory@gmail.com writes:
Hello.
I have a DLL that allocates memory and returns it. Function in DLL is like
this:
void Foo( unsigned char** ppMem, int* pSize )
{
* pSize = 4;
* ppMem = malloc( * pSize );
for( int i = 0; i * pSize; i ++ ) (* pMem)[ i ] = i;
}
Also, i have a python code that access this function from my DLL:
from ctypes import *
Foo = windll.mydll.Foo
Foo.argtypes = [ POINTER( POINTER( c_ubyte ) ), POINTER( c_int ) ]
mem = POINTER( c_ubyte )()
size = c_int( 0 )
Foo( byref( mem ), byref( size ) ]
print size, mem[ 0 ], mem[ 1 ], mem[ 2 ], mem[ 3 ]
I'm expecting that print will show 4 0 1 2 3 but it shows 4 221 221
221 221 O_O. Any hints what i'm doing wrong?
After correcting quite a few obvious errors in your code, it worked just
fine for me. So I guess what you think you test is not what you test.
--- test.py
from ctypes import *
foo =
cdll.LoadLibrary(/Users/deets/projects/GH28/kinect/kinect/c/foo/libtest.dylib).foo
foo.argtypes = [ POINTER( POINTER( c_ubyte ) ), POINTER( c_int ) ]
mem = POINTER( c_ubyte )()
size = c_int( 0 )
foo( byref( mem ), byref( size ) )
print size, mem[ 0 ], mem[ 1 ], mem[ 2 ], mem[ 3 ]
---
--- test.c
void foo( unsigned char** ppMem, int* pSize )
{
int i;
* pSize = 4;
* ppMem = malloc( * pSize );
for( i = 0; i * pSize; i ++ ) (* ppMem)[ i ] = i;
}
---
--- CMakeLists.txt
cmake_minimum_required (VERSION 2.6)
project (Test)
add_library(test SHARED test.c)
---
--
Diez
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