using System.Runtime.InteropServices; namespace HandyControlDemo.Tools { internal class ExternDllHelper { private const string Winmm = "winmm.dll"; [DllImport(Winmm, EntryPoint = "mciSendString", CharSet = CharSet.Auto)] public static extern int MciSendString(string lpstrCommand, string lpstrReturnString, int uReturnLength, int hwndCallback); } }