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C++:
HRESULT GetIMediaSample(IMediaSample ** pSample)
{
    *pSample = [your IMediaSample address]
    return S_OK;
}

C#:
[PreserveSig]
int GetIMediaSample(out IMediaSample pSample)

兩邊有一邊宣告錯誤就會拿到NULL

C# 中使用範例:

IMediaSample sample = null;
if (GetIMediaSample(out sample)==0)
{
    // do something with the sample you got
}