Re: calling ' extern "C" int __declspec(dllexport) ' declared functions?

Hi Ray,

The __declspec(dllexport) should not really impact things.

# can you get a reference the DLL
dll = ctypes.windll.YOURDLLNAME

Can you get references to the functions...
SetBlockSize = dll.SetBlockSize  #using SetBlockSize is easier as the argument is a plain int

ret = SetBlockSize = SetBlockSize(123)

# does ret have the return code for success (or expected return value?)

For GetBlockSize - you will need to read the doc and see what to do with pointer/reference values :)  (but usually ctypes.byref(var) or ctypes.pointer(var) are what you need).

Thanks
  Mark



From: RJ [mailto:[email protected]] 
Sent: Friday, August 13, 2010 6:17 AM
To: [email protected]
Subject: [ctypes-users] calling ' extern "C" int __declspec(dllexport) ' declared functions?

I am trying to access a win32 DLL with functions declared in the .h like this:
extern "C" int __declspec(dllexport) GetBlockSize( int& iBlockSize );
extern "C" int __declspec(dllexport) SetBlockSize( int iBlockSize );
extern "C" int __declspec(dllexport) GetData( int iChannel, float* rData );    

and I'm not getting anywhere. How do I call these three?

-Ray

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