I was trying to use a function in DLL provided using Python Ctypes. I do know that writing a code in C++ would be more efficient and nice option. However, everything in my project is written in Python. So it would take a while for me to convert this code into C++.
The function that I would like to use from the DLL is something like this
int MLAPI_GetDeviceInfo(SAFEARRAY**, SAFEARRAY**)
As you know, ctypes does not have a data type called SAFEARRAY. So I was trying to make a Structure by Class and fields. (Actually there was someone who tried to make SAFEARRAY when I Googled, however, it did not work for me , also looked for similar cases here )
from ctypes import *
class SAFEARRAYBOUND(Structure):
_fields_ = [("cElements" , c_ulong),
("lLbound" , c_long)]
class SAFEARRAY(Structure):
_fields_ = [("cDims", c_ushort),
("fFeatures", c_ushort),
("cbElements", c_ulong),
("cLocks", c_ulong),
("pvData", c_void_p),
("rgsabound", SAFEARRAYBOUND * 1)]
As the structure declaration says in the official document, I wrote two classes about SAFEARRAY and SAFEARRAYBOUND.
Then I wrote the code using ctypes for function use.
getdevicedata = Dll['MLAPI_GetDeviceInfo']
getdevicedata.restype = c_int
getdevicedata.argtypes = ()
getdevicedata()
I was quite unsure what to write for argtypes. Also, I am quite unsure what to put as arguments for getdevicedata function that I have wrote. These are pretty much of my code. I tried bunch of combinations for the arguments but everything failed. So I came to Stackoverflow for your answers...
I am quite noob to Stackoverflow and Python, so if I had made a mistake within this forum or code (or both) please let me know. Thanks for reading. Have a nice day.
Assuming your structures are correct (note they need more work since the arrays are of variable size), the .argtypes is:
getdevicedata.argtypes = POINTER(POINTER(SAFEARRAY)),POINTER(POINTER(SAFEARRAY))