private void GetDeviceNum(object sender, EventArgs e) { int ret = AsuInvoke.Asu_GetDeviceNum(); if (ret == 0) { CountOfDevice = 0; this.cbb_DeviceInfo.Items.Add("No Device Found"); this.cbb_DeviceInfo.SelectedIndex = 0; Print("没有设备连接"); } else { CountOfDevice = ret; while (ret > 0) { this.cbb_DeviceInfo.Items.Add(ret); ret--; } Print("有 " + ret + " 台设备连接"); } }