public static extern VoidPtr OpenFileMapping(_FileMapAccess dwDesiredAccess, bool bInheritHandle, string lpName);
public static extern VoidPtr MapViewOfFileEx(VoidPtr hFileMappingObject, _FileMapAccess dwDesiredAccess, uint dwFileOffsetHigh, uint dwFileOffsetLow, uint dwNumberOfBytesToMap, VoidPtr lpBaseAddress);
public static extern VoidPtr MapViewOfFile(VoidPtr hFileMappingObject, _FileMapAccess dwDesiredAccess, uint dwFileOffsetHigh, uint dwFileOffsetLow, uint dwNumberOfBytesToMap);
OpenFileMapping(_FileMapAccess dwDesiredAccess, bool bInheritHandle, string lpName);