多线程访问非托管代码的技巧Sleep

例:这样的一个HID驱动使用

            /// <summary>
            /// HID驱动
            /// </summary>
            /// <param name="cyHandle">设备句柄</param>
            /// <param name="lpBuffer">数据缓冲区</param>
            /// <param name="dwLength">读取数据长度</param>
            /// <param name="dwReturn">返回时读取了多少数据,用于验正数据正确性</param>
            /// <param name="dwTimeOut">读取当前数据超时时长</param>
            /// <returns></returns>
            [DllImport("HidDriver.dll", CharSet = CharSet.Ansi)]
            public extern static int HID_Read(IntPtr cyHandle, [In, Out] byte[] lpBuffer, int dwLength, ref int dwReturn, int dwTimeOut);

下面是一个读取数据的方法使用.设计是的超时30秒,便这里用的是600个50毫秒,好处是当软件发出一个读数据的指令后,就退出软件时.
 AppExit为true,HID_Read最多延时50毫秒就会退出.

 

   /// <summary>
        /// 从设备读取数据
        /// </summary>
        /// <param name="data">待读取的数据所存放的数据缓存区</param>
        /// <param name="length">待读取的数据长度</param>
        /// <returns>所读取的数据长度</returns>
        public virtual int Read(byte[] data, int length)
        {
            int retNums = 0;
           
            Thread.Sleep(50);

            int index = 0;
            while (index < 600 && !AppExit)
            {
                if (HidUtility.API.HID_Read(Handle, data, length, ref retNums, 50) == HidUtility.Const.HID_DEVICE_SUCCESS) break; ;
                index++; 
            }
           
            return retNums;
        }

 

在多线程中一般我也这样写.从来不用while(true){...} 和 Thread.Sleep(值)值大于1000以上的,大于1000的这样写

 

            int count = 0;
            while (count < 10 && !IsExit)
            {

               //todo:
                Thread.Sleep(100);
                count++;
            }