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POuse python ctypes to interface with nvapi (follow up with demonstration code)
 

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  1. POuse python ctypes to interface with nvapi (follow up with demonstration code)
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    <p>This is a follow up to my previous question: <a href="https://stackoverflow.com/questions/6163770/help-with-python-ctypes-and-nvapi">help with python ctypes and nvapi</a></p> <p>I am posting another question because I already selected an answer in my previous question and the question has shifted direction now.</p> <p>Using python, I am trying to query nvapi.dll to get my gpu usage value. </p> <p>This is how you would do it in C# (referenced below): <a href="http://code.google.com/p/open-hardware-monitor/source/browse/trunk/Hardware/Nvidia/NVAPI.cs" rel="nofollow noreferrer">http://code.google.com/p/open-hardware-monitor/source/browse/trunk/Hardware/Nvidia/NVAPI.cs</a></p> <p>Because I only need a small subset of the functionality I don't really want to swap into using another language. I think that ctypes should be able to do this... I just cannot figure out how to do it. I have never really used Python ctypes before.</p> <p>In order to query for the gpu usage I first need to call the NvAPI_Initialize function. One must also use the query interface to reference the function:</p> <pre><code>from ctypes import * nvapi = WinDLL("nvapi.dll") nvapi_QueryInterface = nvapi.nvapi_QueryInterface </code></pre> <p>Using the above code, I have access to the nvapi_QueryInterface, but I cannot figure out how to replicate this portion:</p> <pre><code>private static void GetDelegate&lt;T&gt;(uint id, out T newDelegate) where T : class { IntPtr ptr = nvapi_QueryInterface(id); if (ptr != IntPtr.Zero) { newDelegate = Marshal.GetDelegateForFunctionPointer(ptr, typeof(T)) as T; } else { newDelegate = null; } } </code></pre> <p>to reference the init and usage functions:</p> <pre><code>GetDelegate(0x0150E828, out NvAPI_Initialize); GetDelegate(0x189A1FDF, out NvAPI_GPU_GetUsages); </code></pre> <p>My understanding of this may still be wrong, but I've spent a good deal of time trying to figure this out so I hope someone can help push me in the right direction because I am a little lost as to how to proceed.</p> <p>Can someone help me understand how I can make this small portion of the code work directly in python? I just need to be able to call the NvAPI_GPU_GetUsages function at the end of the day.</p> <p>Thanks.</p>
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