[DllImport("Test.dll",ChartSet.Ansi,EntryPoint="ReadMyVideo",ExactSpelling=false,CallingConvertion=CallingConvertion.StdCall)] 

private static extern void Test(string fileName,CallbackDelegate callback);

public delegate void CallbackDelegate([marshalAs(UnmanagedType.LPArray,SizeConst=8010)]byte[] buffer,int count); 

public static CallbackDelegate callback;

private void CallBackFunction([marshalAs(UnmanagedType.LPArray,SizeConst=8010)]byte[] buffer,int count) 

{

...//处理c++传过来的数据s

}

public void GetData()

{

     callback=CallBackFunction;

    ReadMyVideo("",callback);

}