http://www.cnblogs.com/ColdFish_Pegasus/archive/2011/10/09/2203523.html
改 [DllImport("winmm.dll", EntryPoint = "sndPlaySoundA",)]
为[DllImport("winmm.dll", EntryPoint = "sndPlaySoundA", CallingConvention = CallingConvention.Cdecl)]
为[DllImport("winmm.dll", EntryPoint = "sndPlaySoundA", CallingConvention = CallingConvention.Cdecl)]