【发布时间】：2012-05-23 05:03:08
【问题描述】：
我是编程新手，但我有一个无法解决的问题。我创建了一个共享文件的程序，例如 Dropbox。我有一台运行良好的服务器和一个客户端。 问题是，当我尝试从服务器下载文件时，流中似乎缺少一些字节。
clientSocket = new TcpClient(Program.host, Program.port);
NetworkStream networkStream = clientSocket.GetStream();
StreamWriter write = new StreamWriter(networkStream);
write.WriteLine(need);
write.Flush();
write.WriteLine(loca);
write.Flush();
StreamReader read = new StreamReader(networkStream);
Int64 size = Convert.ToInt64(read.ReadLine());
long blocks = size / 1024;
long blocksDown = 0;
try
{
string fileName = string.Empty;
int qtd = 0;
int blockSize = 1024;
double progress = 0;
Int64 qtdDown = 0;
Byte[] dataByte = new Byte[blockSize];
bool download = true;
lock (this)
{
networkStream.Read(dataByte, 0, dataByte.Length);
int fileNameLen = BitConverter.ToInt32(dataByte, 0);
fileName = Encoding.ASCII.GetString(dataByte, 4, fileNameLen);
if (File.Exists(Program.loc + fileName))
switch (MessageBox.Show("Ficheiro já existente!\r\nDeseja Substituir?", "Aviso", MessageBoxButtons.YesNo,
MessageBoxIcon.Warning))
{
case DialogResult.Yes:
File.Delete(Program.loc + fileName);
download = true;
break;
case DialogResult.No:
download = false;
break;
}
if (download)
{
Stream fileStream = File.OpenWrite(Program.loc + fileName);
fileStream.Write(dataByte, 4 + fileNameLen, (1024 - (4 + fileNameLen)));
bool progChanged = false;
backWork.WorkerReportsProgress = true;
double progAnt = 0;
while (true)
{
qtd = networkStream.Read(dataByte, 0, blockSize);
qtdDown += qtd;
progress = (double)qtdDown * (double)100 / (double)size;
if (Math.Round(progress) > Math.Round(progAnt))
{
progChanged = true;
progAnt = progress;
}
if (Math.Round(progress) > 0 && progChanged)
{
backWork.ReportProgress(((int)Math.Round(progress)));
progChanged = false;
}
fileStream.Write(dataByte, 0, qtd);
fileStream.Flush();
blocksDown++;
if (qtd == 0)
{
backWork.ReportProgress(100);
qtd = networkStream.Read(dataByte, 0, blockSize);
networkStream.Close();
fileStream.Close();
break;
}
}
MessageBox.Show("O ficheiro " + fileName + " foi guardado em " + Program.loc + ".", "Download",
MessageBoxButtons.OK, MessageBoxIcon.Information);
}
}
}
这就是我正在做的。我正在后台工作人员上进行下载。 首先我在流上写下我正在做的事情，然后我打开文件的流，然后开始读取流并写入文件。
@Ňuf 我试过你说的还是不行 代码长这样，qtdDown和size的字节不相等。抱歉，如果有些部分是葡萄牙语，我的母语是葡萄牙语。
btnAct.Enabled = false;
btnBro.Enabled = false;
btnDown.Enabled = false;
btnSend.Enabled = false;
menuStrip1.Enabled = false;
pBar.Value = 0;
clientSocket = new TcpClient(Program.host, Program.port);
NetworkStream networkStream = clientSocket.GetStream();
StreamWriter write = new StreamWriter(networkStream);
write.WriteLine(need);
write.Flush();
write.WriteLine(loca);
write.Flush();
int blockSize = 1024;
byte[] fileSizeBytes = new byte[blockSize];
networkStream.Read(fileSizeBytes, 0, blockSize);
string fileSizeString = Encoding.ASCII.GetString(fileSizeBytes, 0, fileSizeBytes.Length);
fileSize = Convert.ToInt64(fileSizeString);
qtdDown = 0;
try
{
string fileName = string.Empty;
int qtd = 0;
double progress = 0;
Byte[] dataByte = new Byte[blockSize];
bool download = true;
lock (this)
{
networkStream.Read(dataByte, 0, dataByte.Length);
int fileNameLen = BitConverter.ToInt32(dataByte, 0);
fileName = Encoding.ASCII.GetString(dataByte, 4, fileNameLen);
if (File.Exists(Program.loc + fileName))
switch (MessageBox.Show("Ficheiro já existente!\r\nDeseja Substituir?", "Aviso", MessageBoxButtons.YesNo,
MessageBoxIcon.Warning))
{
case DialogResult.Yes:
File.Delete(Program.loc + fileName);
download = true;
break;
case DialogResult.No:
download = false;
break;
}
if (download)
{
Stream fileStream = File.OpenWrite(Program.loc + fileName);
fileStream.Write(dataByte, 4 + fileNameLen, (1024 - (4 + fileNameLen)));
networkStream.ReadTimeout = 60;
backWork.WorkerReportsProgress = true;
double progAnt = 0;
while (true)
{
qtd = networkStream.Read(dataByte, 0, blockSize);
qtdDown += qtd;
progress = (double)qtdDown * (double)100 / (double)fileSize;
if (Math.Round(progress) > Math.Round(progAnt))
{
progAnt = progress;
backWork.ReportProgress(((int)Math.Round(progress)));
}
fileStream.Write(dataByte, 0, qtd);
if (qtdDown == fileSize)
{
backWork.ReportProgress(100);
fileStream.Close();
networkStream.Close();
break;
}
}
MessageBox.Show("O ficheiro " + fileName + " foi guardado em " + Program.loc + ".", "Download",
MessageBoxButtons.OK, MessageBoxIcon.Information);
}
}
}
catch (Exception ex)
{
menuStrip1.Enabled = true;
btnAct.Enabled = true;
btnBro.Enabled = true;
btnDown.Enabled = true;
btnSend.Enabled = true;
MessageBox.Show("Ocorreu um erro!" + "\r\nBytes Downloaded: "
+ qtdDown.ToString() + "\\" + fileSize.ToString() + "\r\nDetalhes do Erro: " + ex.Message, "Download",
MessageBoxButtons.OK, MessageBoxIcon.Error);
}
menuStrip1.Enabled = true;
btnAct.Enabled = true;
btnBro.Enabled = true;
btnDown.Enabled = true;
btnSend.Enabled = true;
【问题讨论】：
-
是什么让您相信流中缺少字节？
-
@Ramhound 在下载文件之前，我获取了文件大小来更改进度条的值，并且我还有另一个名为 qtdDown 的变量，它代表已经进行的下载。从流中读取所有内容后，我比较它们，但它们永远不相等。
标签： c# file upload download share