如何使用StreamReader.ReadTo克服缓冲区限制 [英] How can I overcome the buffer limitation using StreamReader.ReadTo
问题描述
我正在使用VS 2005，.net 2进行C＃windows应用程序。我正在使用Process
来运行C应用程序并重定向其标准输出，以便我可以使用StreamReader.ReadToEnd读取它/ b $ b。
只有大约30行数据才能读取前5行左右。
我也尝试使用Process.BeginOutputReadlin和
DataReceivedEvntHandler收集输出但我也只获得了大约5行
的数据。
似乎存在缓冲区大小问题。有人可以告诉我，我怎么能解决这个问题
。谢谢。
-
谢谢。
Hi, I''m using VS 2005, ,.net 2 for C# windows application. I''m using Process
to run a C application and redirecting its standard output so I can read it
with StreamReader.ReadToEnd. It''s only reading the 1st 5 lines or so when
there is about 30 lines of data.
I also tried using the Process.BeginOutputReadlin and a
DataReceivedEvntHandler to gather output but I also only get about 5 lines of
the data.
There seems to be a buffer size issue. Can someone tell me how can I
resolve this problem. Thank you.
--
Thanks.
推荐答案
Pucca< Pu ** *@discussions.microsoft.comwrote：
Pucca <Pu***@discussions.microsoft.comwrote:
我正在使用VS 2005，.net 2用于C＃windows应用程序。我正在使用Process
来运行C应用程序并重定向其标准输出，以便我可以使用StreamReader.ReadToEnd读取它/ b $ b。
只有大约30行数据才能读取前5行左右。
我也尝试使用Process.BeginOutputReadlin和
DataReceivedEvntHandler收集输出但我也只获得了大约5行
的数据。
似乎存在缓冲区大小问题。有人可以告诉我，我怎么能解决这个问题
。谢谢。
Hi, I''m using VS 2005, ,.net 2 for C# windows application. I''m using Process
to run a C application and redirecting its standard output so I can read it
with StreamReader.ReadToEnd. It''s only reading the 1st 5 lines or so when
there is about 30 lines of data.
I also tried using the Process.BeginOutputReadlin and a
DataReceivedEvntHandler to gather output but I also only get about 5 lines of
the data.
There seems to be a buffer size issue. Can someone tell me how can I
resolve this problem. Thank you.
应该可以正常工作。你知道你的C应用程序是否实际上是b
整理？您应该阅读标准错误以及标准输出
- 否则如果它试图写入标准错误，则可能是
阻塞。
-
Jon Skeet - < sk *** @ pobox.com>
http://www.pobox.com/~skeet 博客： http://www.msmvps.com/jon.skeet
如果回复该群组，请不要给我发邮件
It should work fine. Do you know if your C application is actually
finishing? You should read from standard error as well as standard out
- otherwise if it''s trying to write to standard error, it may be
blocking.
--
Jon Skeet - <sk***@pobox.com>
http://www.pobox.com/~skeet Blog: http://www.msmvps.com/jon.skeet
If replying to the group, please do not mail me too
这是我的代码，首先尝试读取标准输出。在调试模式下
我可以看到读入了一些数据行但是进程从未有过退出状态。我甚至拿走了超时值并且它只是挂起并且
坐在那里我可以看到流缓冲区达到限制并挂起。
listFiles.WaitForExit（）;
有没有办法在没有缓冲限制的情况下读取我的所有数据？谢谢。
public static int GetNisFile（System.Diagnostics.ProcessStartInfo psi，
ref DataTable dtAccounts，
ref ToolStripStatusLabel slMain ，ref StatusStrip ssMain，string
userOrGroup）
{
string accountFile =""，output ="" ;;
int numOfAccounts = 0;
System.IO.StreamReader fileOutput = null，myOutput = null;
System.Diagnostics.Process listFiles ;
试试
{
listFiles = System.Diagnostics.Process.Start（psi）;
if（b） listFiles！= null）
{
myOutput = listFiles.StandardError;
fileOutput = listFiles.StandardOutput;
listFiles.WaitForExit（30000）;
if（listFiles.HasExited）
{
//读取并显示文件中的行直到结束
//文件已到达。
accountFile = fileOutput.ReadToEnd（）;
output = myOutput.ReadToEnd（）;
if（accountFile！= null&& accountFile！=""）
numOfAccounts =
CPAUnix.ParseAndInsertAccounts（accountFile，
ref dtAccounts，ref slMain，ref ssMain，userOrGroup ）;
}
其他
MessageBox.Show（"超时检索NIS" + userOrGroup +
" accounts。"，
" PowerADvantage"）;
}
else
MessageBox.Show （启动进程读取文件时出错。，
PowerADvantage）;
返回numOfAccounts;
}
catch（Win32Exception wex）
{
MessageBox.Show（wex.Message，" PowerADvantage"）;
返回numOfAccounts;
}
}
-
谢谢。
" Jon Skeet [C＃MVP]"写道：
Here is my code on first try to read the standard output. In the debug mode
I can see some lines of the data are read in but the process never has a
exited status. I even took away the time out value and it just hangs and
sits there and I can see the stream buffer hits a limit and hangs.
listFiles.WaitForExit();
Is there a way to read all my data in without a buffer limitation? Thank you.
public static int GetNisFile(System.Diagnostics.ProcessStartInfo psi,
ref DataTable dtAccounts,
ref ToolStripStatusLabel slMain, ref StatusStrip ssMain, string
userOrGroup)
{
string accountFile="", output="";
int numOfAccounts = 0;
System.IO.StreamReader fileOutput = null, myOutput = null;
System.Diagnostics.Process listFiles;
try
{
listFiles = System.Diagnostics.Process.Start(psi);
if (listFiles != null)
{
myOutput = listFiles.StandardError;
fileOutput = listFiles.StandardOutput;
listFiles.WaitForExit(30000);
if (listFiles.HasExited)
{
// Read and display lines from the file until the end of
// the file is reached.
accountFile = fileOutput.ReadToEnd();
output = myOutput.ReadToEnd();
if (accountFile != null && accountFile != "")
numOfAccounts =
CPAUnix.ParseAndInsertAccounts(accountFile,
ref dtAccounts, ref slMain, ref ssMain, userOrGroup);
}
else
MessageBox.Show("Time out retrieving NIS" + userOrGroup +
"accounts.",
"PowerADvantage");
}
else
MessageBox.Show("Error starting process to read file.",
"PowerADvantage");
return numOfAccounts;
}
catch (Win32Exception wex)
{
MessageBox.Show(wex.Message, "PowerADvantage");
return numOfAccounts;
}
}
--
Thanks.
"Jon Skeet [C# MVP]" wrote:
Pucca< Pu *** @ discussion.microsoft.comwrote：
Pucca <Pu***@discussions.microsoft.comwrote:
我正在使用VS 2005，.net 2进行C＃windows应用程序。我正在使用Process
来运行C应用程序并重定向其标准输出，以便我可以使用StreamReader.ReadToEnd读取它/ b $ b。
只有大约30行数据才能读取前5行左右。
我也尝试使用Process.BeginOutputReadlin和
DataReceivedEvntHandler收集输出但我也只获得了大约5行
的数据。
似乎存在缓冲区大小问题。有人可以告诉我，我怎么能解决这个问题
。谢谢。
Hi, I''m using VS 2005, ,.net 2 for C# windows application. I''m using Process
to run a C application and redirecting its standard output so I can read it
with StreamReader.ReadToEnd. It''s only reading the 1st 5 lines or so when
there is about 30 lines of data.
I also tried using the Process.BeginOutputReadlin and a
DataReceivedEvntHandler to gather output but I also only get about 5 lines of
the data.
There seems to be a buffer size issue. Can someone tell me how can I
resolve this problem. Thank you.
它应该可以正常工作。你知道你的C应用程序是否实际上是b
整理？您应该阅读标准错误以及标准输出
- 否则如果它试图写入标准错误，则可能是
阻塞。
-
Jon Skeet - < sk *** @ pobox.com>
http://www.pobox.com/~skeet 博客： http://www.msmvps.com/jon.skeet
如果回复该群组，请不要给我发邮件
It should work fine. Do you know if your C application is actually
finishing? You should read from standard error as well as standard out
- otherwise if it''s trying to write to standard error, it may be
blocking.
--
Jon Skeet - <sk***@pobox.com>
http://www.pobox.com/~skeet Blog: http://www.msmvps.com/jon.skeet
If replying to the group, please do not mail me too
这是我使用BeginOutputReadLine的代码。这段代码没有时间
out问题，但它只返回5行数据。
static System.Text.StringBuilder sb = new System .Text.StringBuilder（）;
static void proc_OutputDataReceived（object sender，DataReceivedEventArgs e）
{
sb.Append（e.Data） ;
}
public static int GetNisFile（System.Diagnostics.ProcessStartInfo psi，
ref DataTable dtAccounts，
ref ToolStripStatusLabel slMain，ref StatusStrip ssMain，string
userOrGroup）
{
string accountFile ="" ;，output =""，line =""，theResult ="" ;;
int numOfAccounts = 0;
System.IO.StreamReader fileOutput = null，myOutput = null;
System.Diagnostics.Process listFiles = new Process（）;
listFiles.StartInfo = psi;
try
{
String inputText;
int numInputLines = 0;
listFi les.OutputDataReceived + = new
DataReceivedEventHandler（proc_OutputDataReceived）;
// listFiles = System.Diagnostics.Process.Start（psi）;
//使用流编写器同步写入排序输入。
listFiles.Start（）;
// StreamReader nisReader = listFiles.StandardOutput;
listFiles.BeginOutputReadLine（）;
listFiles.WaitForExit（）;
theResult = sb.ToString（）;
listFiles.CancelOutputRead（ ）;
listFiles.Kill（）;
返回numOfAccounts;
}
catch（ Win32Exception wex）
{
MessageBox.Show（wex.Message，" PowerADvantage"）;
返回numOfAccounts;
}
}
-
谢谢。
" Jon Skeet [C＃MVP]" ;写道：
Here is my code using BeginOutputReadLine. This code doesn''t have the time
out issue but it only returns 5 lines of data.
static System.Text.StringBuilder sb = new System.Text.StringBuilder();
static void proc_OutputDataReceived(object sender, DataReceivedEventArgs e)
{
sb.Append(e.Data);
}
public static int GetNisFile(System.Diagnostics.ProcessStartInfo psi,
ref DataTable dtAccounts,
ref ToolStripStatusLabel slMain, ref StatusStrip ssMain, string
userOrGroup)
{
string accountFile = "", output = "", line = "", theResult="";
int numOfAccounts = 0;
System.IO.StreamReader fileOutput = null, myOutput = null;
System.Diagnostics.Process listFiles = new Process();
listFiles.StartInfo = psi;
try
{
String inputText;
int numInputLines = 0;
listFiles.OutputDataReceived += new
DataReceivedEventHandler(proc_OutputDataReceived);
//listFiles = System.Diagnostics.Process.Start(psi);
// Use a stream writer to synchronously write the sort input.
listFiles.Start();
//StreamReader nisReader = listFiles.StandardOutput;
listFiles.BeginOutputReadLine();
listFiles.WaitForExit();
theResult = sb.ToString();
listFiles.CancelOutputRead();
listFiles.Kill();
return numOfAccounts;
}
catch (Win32Exception wex)
{
MessageBox.Show(wex.Message, "PowerADvantage");
return numOfAccounts;
}
}
--
Thanks.
"Jon Skeet [C# MVP]" wrote:
Pucca< Pu *** @ discussion.microsoft.comwrote：
Pucca <Pu***@discussions.microsoft.comwrote:
我正在使用VS 2005，.net 2进行C＃windows应用程序。我正在使用Process
来运行C应用程序并重定向其标准输出，以便我可以使用StreamReader.ReadToEnd读取它/ b $ b。
只有大约30行数据才能读取前5行左右。
我也尝试使用Process.BeginOutputReadlin和
DataReceivedEvntHandler收集输出但我也只获得了大约5行
的数据。
似乎存在缓冲区大小问题。有人可以告诉我，我怎么能解决这个问题
。谢谢。
Hi, I''m using VS 2005, ,.net 2 for C# windows application. I''m using Process
to run a C application and redirecting its standard output so I can read it
with StreamReader.ReadToEnd. It''s only reading the 1st 5 lines or so when
there is about 30 lines of data.
I also tried using the Process.BeginOutputReadlin and a
DataReceivedEvntHandler to gather output but I also only get about 5 lines of
the data.
There seems to be a buffer size issue. Can someone tell me how can I
resolve this problem. Thank you.
它应该可以正常工作。你知道你的C应用程序是否实际上是b
整理？您应该阅读标准错误以及标准输出
- 否则如果它试图写入标准错误，则可能是
阻塞。
-
Jon Skeet - < sk *** @ pobox.com>
http://www.pobox.com/~skeet 博客： http://www.msmvps.com/jon.skeet
如果回复该群组，请不要给我发邮件
It should work fine. Do you know if your C application is actually
finishing? You should read from standard error as well as standard out
- otherwise if it''s trying to write to standard error, it may be
blocking.
--
Jon Skeet - <sk***@pobox.com>
http://www.pobox.com/~skeet Blog: http://www.msmvps.com/jon.skeet
If replying to the group, please do not mail me too
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