Does Ctypes Structures and POINTERS automatically free the memory when the Python object is deleted?

The memory is not freed, because Python has no idea if or how it should be freed. Compare these two functions: void testfunc1(PIX *pix) { static char staticBuffer256 = "static memory"; pix->text = staticBuffer; } void testfunc2(PIX *pix) { pix->text = (char *)malloc(32); strcpy(pix->text, "dynamic memory"); } Used like this: pix1, pix2 = PIX(), PIX() mylib. Testfunc1(ctypes.

Byref(pix1)) mylib. Testfunc2(ctypes. Byref(pix2)) And then at some point pix1 and pix2 go out of scope.

When that happens, nothing happens to the inner pointers—if they pointed to dynamic memory (as is the case here with pix2 but not pix1 ), you are responsible for freeing it The proper way to solve this problem is, if you allocate dynamic memory in your C code, you should provide a corresponding function that deallocates that memory. For example: void freepix(PIX *pix) { free(pix->text); } pix2 = PIX() mylib. Testfunc2(ctypes.

Byref(pix2)) ... mylib. Freepix(ctypes. Byref(pix2)).

The memory is not freed, because Python has no idea if or how it should be freed. Compare these two functions: void testfunc1(PIX *pix) { static char staticBuffer256 = "static memory"; pix->text = staticBuffer; } void testfunc2(PIX *pix) { pix->text = (char *)malloc(32); strcpy(pix->text, "dynamic memory"); } Used like this: pix1, pix2 = PIX(), PIX() mylib. Testfunc1(ctypes.

Byref(pix1)) mylib. Testfunc2(ctypes. Byref(pix2)) And then at some point, pix1 and pix2 go out of scope.

When that happens, nothing happens to the inner pointers—if they pointed to dynamic memory (as is the case here with pix2 but not pix1), you are responsible for freeing it. The proper way to solve this problem is, if you allocate dynamic memory in your C code, you should provide a corresponding function that deallocates that memory. For example: void freepix(PIX *pix) { free(pix->text); } pix2 = PIX() mylib.

Testfunc2(ctypes. Byref(pix2)) ... mylib. Freepix(ctypes.

Byref(pix2)).

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