c# - C# 中的 Direct3D COM 对象调用

Question

有人尝试过从 C# 手动调用 Direct3D 接口吗？我编写了以下短代码并result == S_OK在调用D3D11CreateDevice().

我希望GetCreationFlags()返回32，这是我调用时的参数之一D3D11CreateDevice()，但我得到了AccessViolationException。我在这里想念什么？

先感谢您。

[Guid("DB6F6DDB-AC77-4E88-8253-819DF9BBF140")]
interface ID3D11Device
{
    [return : MarshalAs(UnmanagedType.U4)]
    uint GetCreationFlags();
}

    [DllImport("d3d11.dll", CallingConvention = CallingConvention.StdCall)]
    private unsafe static extern int D3D11CreateDevice(
        void* arg0, int arg1, void* arg2, int arg3, void* arg4, int arg5, int arg6,
        [Out, MarshalAs(UnmanagedType.Interface)] out object arg7,
        void* arg8, void* arg9);

    public static void CreateDevice()
    {
        object deviceOut;
        int arg8;
        IntPtr arg9;

        unsafe
        {
            int result = D3D11CreateDevice(
                (void*)IntPtr.Zero, 1, (void*)IntPtr.Zero, 32,
                (void*)IntPtr.Zero, 0, 7,
                out deviceOut,
                &arg8,
                &arg9);
        }

        ID3D11Device dev = (ID3D11Device)deviceOut;

        uint i = dev.GetCreationFlags(); // System.AccessViolationException
    }

供您参考，原型D3D11CreateDevice和ID3D11Device::GetCreationFlags()外观如下：

HRESULT D3D11CreateDevice(
  _In_   IDXGIAdapter *pAdapter,
  _In_   D3D_DRIVER_TYPE DriverType,
  _In_   HMODULE Software,
  _In_   UINT Flags,
  _In_   const D3D_FEATURE_LEVEL *pFeatureLevels,
  _In_   UINT FeatureLevels,
  _In_   UINT SDKVersion,
  _Out_  ID3D11Device **ppDevice,
  _Out_  D3D_FEATURE_LEVEL *pFeatureLevel,
  _Out_  ID3D11DeviceContext **ppImmediateContext
);

UINT GetCreationFlags();