public static extern bool PlayM4_SetCheckWatermarkCallBack(int nPort, FUNCHECKWATERMARK funCheckWatermark, uint nUser);
public static extern bool PlayM4_SetCheckWatermarkCallBack(int nPort, FUNCHECKWATERMARK funCheckWatermark, uint nUser);
public static extern bool PlayM4_SetCheckWatermarkCallBack(int nPort, FUNCHECKWATERMARK funCheckWatermark, uint nUser);
public static extern bool PlayM4_SetCheckWatermarkCallBack(int nPort, FUNCHECKWATERMARK funCheckWatermark, uint nUser);