public bool Handler(int readCount, byte[] readBuffer)
{
FileTransferProtocol.Copy(readBuffer, 0, frameBuffer, validBytes, readCount);
validBytes += readCount;
Debug.WriteLine("最大可能的帧冲区长度:" + validBytes);
//如果找到的可能的帧尾
while ((findFrameTailIndex = FindTailIndexEx(frameBuffer, findFrameTailIndex + 1, validBytes)) > -1 && validBytes >= FileTransferProtocol.MinFrameLength)
{
//如果足够长(有效数据长度不小于最小帧帧长度 找到的帧尾的下标需要不小于最小帧的帧尾下标)
if (findFrameTailIndex >= FileTransferProtocol.MinFrameLength - 1 && findFrameTailIndex < validBytes)
{
//帧头下标=帧尾下标 - 偏移
int headIndex = findFrameTailIndex - BitConverter.ToUInt16(frameBuffer, findFrameTailIndex - FileTransferProtocol.FromFrametailToOffset);
Debug.WriteLine(string.Format("@headIndex={0}", headIndex));
//如果对应下标项是帧头
if ((headIndex >= 0 && headIndex < findFrameTailIndex && headIndex < validBytes) && frameBuffer[headIndex] == frameHead)//只有headIndex大于等于0且小于findFrameTailIndex才有效
{
Debug.WriteLine(string.Format("#headIndex={0}", headIndex));
if (headIndex != 0)
{
Debug.WriteLine(string.Format("headIndex={0} frameBuffer=[{1:X2},{2:X2},{3:X2},{4:X2} ] findFrameTailIndex={5}", headIndex, frameBuffer[0], frameBuffer[1], frameBuffer[2], frameBuffer[3], findFrameTailIndex));
}
//前移帧数据
if (headIndex != 0)
{
FileTransferProtocol.Copy(frameBuffer, headIndex, frameBuffer, 0, validBytes - headIndex);
validBytes = validBytes - headIndex;
findFrameTailIndex = findFrameTailIndex - headIndex;
}
//处理数据
byte commandType = frameBuffer[FileTransferProtocol.CommandTypeIndex];
int frameLength = BitConverter.ToUInt16(frameBuffer, findFrameTailIndex - FileTransferProtocol.FromFrametailToOffset) + 1;
findFrameTailIndex = -1;
//Debug.WriteLine(string.Format("frameLength={0},validBytes={1},findFrameTailIndex={2},headIndex={3},cmdType={4}", frameLength, validBytes, findFrameTailIndex, headIndex, cmdType));
byte[] da = null;
if (frameLength > FileTransferProtocol.FrameStructLength)
{
da = new byte[frameLength - FileTransferProtocol.FrameStructLength];
FileTransferProtocol.Copy(frameBuffer, FileTransferProtocol.CommandDataIndex, da, 0, da.Length);
}
if (OnReceiveFrame != null)
{
//是否继续帧分析处理
if (false == OnReceiveFrame((FileTransferProtocol.CommandType)commandType, BitConverter.ToInt32(frameBuffer, FileTransferProtocol.ParameterIndex), da))
{
return(false);
}
}
//清除已处理的帧
Array.Clear(frameBuffer, 0, frameLength);
//前移未处理的数据
int unhandleLength = validBytes - frameLength;
if (unhandleLength > 0)
{
FileTransferProtocol.Copy(frameBuffer, frameLength, frameBuffer, 0, unhandleLength);
validBytes = unhandleLength;
findFrameTailIndex = -1;
}
else
{
validBytes = 0;
findFrameTailIndex = -1;
}
}
else//对应下标项不是帧头
{
//继续查找下一个帧尾
}
}
else//不足则
{
//继续把当前临时缓冲区readBuffer复制到帧缓冲区frameBuffer之中
}
}
//是否继续帧分析处理
//在外部调用本函数可根据该返回做退出无限循环操作
findFrameTailIndex = validBytes - FileTransferProtocol.FrameTail.Length;
return(true);
}
bool serialPortFrameMgr_OnReceiveFrame(FileTransferProtocol.CommandType frameType, int parameter, byte[] commandData)
{
switch (frameType)
{
case FileTransferProtocol.CommandType.FileName:
string fileName = System.Text.Encoding.Default.GetString(commandData);
if (fileName != null)
{
string CurrentPath = Path.GetDirectoryName(Assembly.GetExecutingAssembly().ManifestModule.FullyQualifiedName);
string startDir = CurrentPath + @"update\";
if (File.Exists(fileName))
{
File.Delete(fileName);
}
fStream = File.Open(fileName, FileMode.CreateNew);
//SetText(DateTime.Now.ToString() + " 准备接收文件：" + fileName + " 文件总长度：" + parameter);
if (OnFileTransferStateMessage != null)
{
OnFileTransferStateMessage(DateTime.Now.ToString() + " 准备接收文件：" + fileName + " 文件总长度：" + parameter);
}
}
break;
case FileTransferProtocol.CommandType.FileData:
if (fStream != null && commandData != null && commandData.Length > 0)
{
fStream.Write(commandData, 0, commandData.Length);
//SetText("收到文件数据长度" + commandData.Length);
if (OnFileTransferStateMessage != null)
{
OnFileTransferStateMessage("收到文件数据长度" + commandData.Length);
}
}
break;
case FileTransferProtocol.CommandType.FileSendFinish:
if (fStream != null)
{
fStream.Close();
fStream = null;
if (OnFileTransferStateMessage != null)
{
OnFileTransferStateMessage(DateTime.Now.ToString() + " 收到文件结束信号");
}
//SetText(DateTime.Now.ToString() + " 收到文件结束信号");
}
break;
case FileTransferProtocol.CommandType.WhatIsYourMNandVersion:
byte[] frame = FileTransferProtocol.GetFrameMNVersionLimited(mVersion, mThisDeviceMN, mSerialPort.BaudRate);
mSerialPort.Write(frame, 0, frame.Length);
if (OnFileTransferStateMessage != null)
{
OnFileTransferStateMessage(string.Format("服务端索要MN及版本，本机以应答:MN={0} 版本:{1}", "123", 1));
}
break;
case FileTransferProtocol.CommandType.Message:
string message = System.Text.Encoding.Default.GetString(commandData);
if (OnFileTransferStateMessage != null)
{
OnFileTransferStateMessage(message);
}
//this.Invoke(new EventHandler(delegate(object s, EventArgs ar)
//{
// this.txtData.Text += message + "\r\n";
//}));
break;
default:
if (OnFileTransferStateMessage != null)
{
OnReceiveFrame(frameType, parameter, commandData);
}
break;
}
return(true);
}
