Process.CancelOutputRead Yöntem
Tanım
Önemli
Bazı bilgiler ürünün ön sürümüyle ilgilidir ve sürüm öncesinde önemli değişiklikler yapılmış olabilir. Burada verilen bilgilerle ilgili olarak Microsoft açık veya zımni hiçbir garanti vermez.
Bir uygulamanın yeniden yönlendirilen StandardOutput akışında zaman uyumsuz okuma işlemini iptal eder.
public:
void CancelOutputRead();public void CancelOutputRead();[System.Runtime.InteropServices.ComVisible(false)]
public void CancelOutputRead();member this.CancelOutputRead : unit -> unit[<System.Runtime.InteropServices.ComVisible(false)>]
member this.CancelOutputRead : unit -> unitPublic Sub CancelOutputRead ()- Öznitelikler
Özel durumlar
Akış StandardOutput , zaman uyumsuz okuma işlemleri için etkinleştirilmedi.
Örnekler
Aşağıdaki örnek, komutu kullanıcı tarafından sağlanan bağımsız değişkenlerle başlatır nmake . Hata ve çıkış akışları zaman uyumsuz olarak okunur; toplanan metin satırları konsolda görüntülenir ve bir günlük dosyasına yazılır. Komut çıktısı belirtilen sayıda satırı aşarsa, zaman uyumsuz okuma işlemleri iptal edilir.
namespace ProcessAsyncStreamSamples
{
class ProcessNMakeStreamRedirection
{
// Define static variables shared by class methods.
private static StreamWriter buildLogStream =null;
private static Mutex logMutex = new Mutex();
private static int maxLogLines = 25;
private static int currentLogLines = 0;
public static void RedirectNMakeCommandStreams()
{
String nmakeArguments = null;
Process nmakeProcess;
// Get the input nmake command-line arguments.
Console.WriteLine("Enter the NMake command line arguments " +
"(@commandfile or /f makefile, etc):");
String inputText = Console.ReadLine();
if (!String.IsNullOrEmpty(inputText))
{
nmakeArguments = inputText;
}
Console.WriteLine("Enter max line limit for log file (default is 25):");
inputText = Console.ReadLine();
if (!String.IsNullOrEmpty(inputText))
{
if (!Int32.TryParse(inputText, out maxLogLines))
{
maxLogLines = 25;
}
}
Console.WriteLine("Output beyond {0} lines will be ignored.",
maxLogLines);
// Initialize the process and its StartInfo properties.
nmakeProcess = new Process();
nmakeProcess.StartInfo.FileName = "NMake.exe";
// Build the nmake command argument list.
if (!String.IsNullOrEmpty(nmakeArguments))
{
nmakeProcess.StartInfo.Arguments = nmakeArguments;
}
// Set UseShellExecute to false for redirection.
nmakeProcess.StartInfo.UseShellExecute = false;
// Redirect the standard output of the nmake command.
// Read the stream asynchronously using an event handler.
nmakeProcess.StartInfo.RedirectStandardOutput = true;
nmakeProcess.OutputDataReceived += new DataReceivedEventHandler(NMakeOutputDataHandler);
// Redirect the error output of the nmake command.
nmakeProcess.StartInfo.RedirectStandardError = true;
nmakeProcess.ErrorDataReceived += new DataReceivedEventHandler(NMakeErrorDataHandler);
logMutex.WaitOne();
currentLogLines = 0;
// Write a header to the log file.
const String buildLogFile = "NmakeCmd.Txt";
try
{
buildLogStream = new StreamWriter(buildLogFile, true);
}
catch (Exception e)
{
Console.WriteLine("Could not open output file {0}", buildLogFile);
Console.WriteLine("Exception = {0}", e.ToString());
Console.WriteLine(e.Message);
buildLogStream = null;
}
if (buildLogStream != null)
{
Console.WriteLine("Nmake output logged to {0}",
buildLogFile);
buildLogStream.WriteLine();
buildLogStream.WriteLine(DateTime.Now.ToString());
if (!String.IsNullOrEmpty(nmakeArguments))
{
buildLogStream.Write("Command line = NMake {0}",
nmakeArguments);
}
else
{
buildLogStream.Write("Command line = Nmake");
}
buildLogStream.WriteLine();
buildLogStream.Flush();
logMutex.ReleaseMutex();
// Start the process.
Console.WriteLine();
Console.WriteLine("\nStarting Nmake command...");
Console.WriteLine();
nmakeProcess.Start();
// Start the asynchronous read of the error stream.
nmakeProcess.BeginErrorReadLine();
// Start the asynchronous read of the output stream.
nmakeProcess.BeginOutputReadLine();
// Let the nmake command run, collecting the output.
nmakeProcess.WaitForExit();
nmakeProcess.Close();
buildLogStream.Close();
logMutex.Dispose();
}
}
private static void NMakeOutputDataHandler(object sendingProcess,
DataReceivedEventArgs outLine)
{
// Collect the output, displaying it to the screen and
// logging it to the output file. Cancel the read
// operation when the maximum line limit is reached.
if (!String.IsNullOrEmpty(outLine.Data))
{
logMutex.WaitOne();
currentLogLines++;
if (currentLogLines > maxLogLines)
{
// Display the line to the console.
// Skip writing the line to the log file.
Console.WriteLine("StdOut: {0}", outLine.Data);
}
else if (currentLogLines == maxLogLines)
{
LogToFile("StdOut", "<Max build log limit reached!>",
true);
// Stop reading the output streams.
Process p = sendingProcess as Process;
if (p != null)
{
p.CancelOutputRead();
p.CancelErrorRead();
}
}
else
{
// Write the line to the log file.
LogToFile("StdOut", outLine.Data, true);
}
logMutex.ReleaseMutex();
}
}
private static void NMakeErrorDataHandler(object sendingProcess,
DataReceivedEventArgs errLine)
{
// Collect error output, displaying it to the screen and
// logging it to the output file. Cancel the error output
// read operation when the maximum line limit is reached.
if (!String.IsNullOrEmpty(errLine.Data))
{
logMutex.WaitOne();
currentLogLines++;
if (currentLogLines > maxLogLines)
{
// Display the error line to the console.
// Skip writing the line to the log file.
Console.WriteLine("StdErr: {0}", errLine.Data);
}
else if (currentLogLines == maxLogLines)
{
LogToFile("StdErr", "<Max build log limit reached!>",
true);
// Stop reading the output streams
Process p = sendingProcess as Process;
if (p != null)
{
p.CancelErrorRead();
p.CancelOutputRead();
}
}
else
{
// Write the line to the log file.
LogToFile("StdErr", errLine.Data, true);
}
logMutex.ReleaseMutex();
}
}
private static void LogToFile(String logPrefix,
String logText, bool echoToConsole)
{
// Write the specified line to the log file stream.
StringBuilder logString = new StringBuilder();
if (!String.IsNullOrEmpty(logPrefix))
{
logString.AppendFormat("{0}> ", logPrefix);
}
if (!String.IsNullOrEmpty(logText))
{
logString.Append(logText);
}
if (buildLogStream != null)
{
buildLogStream.WriteLine("[{0}] {1}",
DateTime.Now.ToString(), logString.ToString());
buildLogStream.Flush();
}
if (echoToConsole)
{
Console.WriteLine(logString.ToString());
}
}
}
}
// Define static variables shared by class methods.
let mutable buildLogStream = Unchecked.defaultof<StreamWriter>
let logMutex = new Mutex()
let mutable maxLogLines = 25
let mutable currentLogLines = 0
let logToFile logPrefix logText echoToConsole =
// Write the specified line to the log file stream.
let logString = StringBuilder()
if String.IsNullOrEmpty logPrefix |> not then
logString.AppendFormat $"{logPrefix}> " |> ignore
if String.IsNullOrEmpty logPrefix |> not then
logString.AppendFormat $"{logPrefix}> " |> ignore
if String.IsNullOrEmpty logText |> not then
logString.Append logText |> ignore
if isNull buildLogStream |> not then
buildLogStream.WriteLine $"[{DateTime.Now}] {logString}"
buildLogStream.Flush()
if echoToConsole then
printfn $"{logString}"
let nMakeOutputDataHandler (sendingProcess: obj) (outLine: DataReceivedEventArgs) =
// Collect the output, displaying it to the screen and
// logging it to the output file. Cancel the read
// operation when the maximum line limit is reached.
if String.IsNullOrEmpty outLine.Data |> not then
logMutex.WaitOne() |> ignore
currentLogLines <- currentLogLines + 1
if currentLogLines > maxLogLines then
// Display the line to the console.
// Skip writing the line to the log file.
Console.WriteLine("StdOut: {0}", outLine.Data)
elif currentLogLines = maxLogLines then
logToFile "StdOut" "<Max build log limit reached!>" true
// Stop reading the output streams.
match sendingProcess with
| :? Process as p ->
p.CancelOutputRead()
p.CancelErrorRead()
| _ -> ()
else
// Write the line to the log file.
logToFile "StdOut" outLine.Data true
logMutex.ReleaseMutex()
let nMakeErrorDataHandler (sendingProcess: obj) (errLine: DataReceivedEventArgs) =
// Collect error output, displaying it to the screen and
// logging it to the output file. Cancel the error output
// read operation when the maximum line limit is reached.
if String.IsNullOrEmpty errLine.Data |> not then
logMutex.WaitOne() |> ignore
currentLogLines <- currentLogLines + 1
if currentLogLines > maxLogLines then
// Display the error line to the console.
// Skip writing the line to the log file.
printfn $"StdErr: {errLine.Data}"
elif currentLogLines = maxLogLines then
logToFile "StdErr" "<Max build log limit reached!>" true
// Stop reading the output streams
match sendingProcess with
| :? Process as p ->
p.CancelErrorRead()
p.CancelOutputRead()
| _ -> ()
else
// Write the line to the log file.
logToFile "StdErr" errLine.Data true
logMutex.ReleaseMutex()
let redirectNMakeCommandStreams () =
// Get the input nmake command-line arguments.
printfn "Enter the NMake command line arguments (@commandfile or /f makefile, etc):"
let nmakeArguments = stdin.ReadLine()
printfn "Enter max line limit for log file (default is 25):"
let inputText = Console.ReadLine()
if String.IsNullOrEmpty inputText |> not then
if Int32.TryParse(inputText, &maxLogLines) |> not then
maxLogLines <- 25
printfn $"Output beyond {maxLogLines} lines will be ignored."
// Initialize the process and its StartInfo properties.
let nmakeProcess = new Process()
nmakeProcess.StartInfo.FileName <- "NMake.exe"
// Build the nmake command argument list.
if String.IsNullOrEmpty nmakeArguments |> not then
nmakeProcess.StartInfo.Arguments <- nmakeArguments
// Set UseShellExecute to false for redirection.
nmakeProcess.StartInfo.UseShellExecute <- false
// Redirect the standard output of the nmake command.
// Read the stream asynchronously using an event handler.
nmakeProcess.StartInfo.RedirectStandardOutput <- true
nmakeProcess.OutputDataReceived.AddHandler(DataReceivedEventHandler nMakeOutputDataHandler)
// Redirect the error output of the nmake command.
nmakeProcess.StartInfo.RedirectStandardError <- true
nmakeProcess.ErrorDataReceived.AddHandler(DataReceivedEventHandler nMakeErrorDataHandler)
logMutex.WaitOne() |> ignore
currentLogLines <- 0
// Write a header to the log file.
let buildLogFile = "NmakeCmd.Txt"
try
buildLogStream <- new StreamWriter(buildLogFile, true)
with e ->
printfn $"Could not open output file {buildLogFile}"
printfn $"Exception = {e}"
printfn $"{e.Message}"
buildLogStream <- null
if isNull buildLogStream |> not then
printfn $"Nmake output logged to {buildLogFile}"
buildLogStream.WriteLine()
buildLogStream.WriteLine DateTime.Now
if String.IsNullOrEmpty nmakeArguments |> not then
buildLogStream.Write $"Command line = NMake {nmakeArguments}"
else
buildLogStream.Write "Command line = Nmake"
buildLogStream.WriteLine()
buildLogStream.Flush()
logMutex.ReleaseMutex()
// Start the process.
Console.WriteLine("\n\nStarting Nmake command...\n")
nmakeProcess.Start() |> ignore
// Start the asynchronous read of the error stream.
nmakeProcess.BeginErrorReadLine()
// Start the asynchronous read of the output stream.
nmakeProcess.BeginOutputReadLine()
// Let the nmake command run, collecting the output.
nmakeProcess.WaitForExit()
nmakeProcess.Close()
buildLogStream.Close()
logMutex.Dispose()
' Define the namespaces used by this sample.
Imports System.Text
Imports System.IO
Imports System.Diagnostics
Imports System.Threading
Imports System.ComponentModel
Class ProcessNMakeStreamRedirection
' Define static variables shared by class methods.
Private Shared buildLogStream As StreamWriter = Nothing
Private Shared logMutex As Mutex = New Mutex()
Private Shared maxLogLines As Integer = 25
Private Shared currentLogLines As Integer = 0
Public Shared Sub RedirectNMakeCommandStreams()
Dim nmakeArguments As String = Nothing
Dim nmakeProcess As Process
' Get the input nmake command-line arguments.
Console.WriteLine("Enter the NMake command line arguments" + _
" (@commandfile or /f makefile, etc):")
Dim inputText As String = Console.ReadLine()
If Not String.IsNullOrEmpty(inputText) Then
nmakeArguments = inputText
End If
Console.WriteLine("Enter max line limit for log file (default is 25):")
inputText = Console.ReadLine()
If Not String.IsNullOrEmpty(inputText) Then
If Not Int32.TryParse(inputText, maxLogLines) Then
maxLogLines = 25
End If
End If
Console.WriteLine("Output beyond {0} lines will be ignored.", _
maxLogLines)
' Initialize the process and its StartInfo properties.
nmakeProcess = New Process()
nmakeProcess.StartInfo.FileName = "NMake.exe"
' Build the nmake command argument list.
If Not String.IsNullOrEmpty(nmakeArguments) Then
nmakeProcess.StartInfo.Arguments = nmakeArguments
End If
' Set UseShellExecute to false for redirection.
nmakeProcess.StartInfo.UseShellExecute = False
' Redirect the standard output of the nmake command.
' Read the stream asynchronously using an event handler.
nmakeProcess.StartInfo.RedirectStandardOutput = True
AddHandler nmakeProcess.OutputDataReceived, _
AddressOf NMakeOutputDataHandler
' Redirect the error output of the nmake command.
nmakeProcess.StartInfo.RedirectStandardError = True
AddHandler nmakeProcess.ErrorDataReceived, _
AddressOf NMakeErrorDataHandler
logMutex.WaitOne()
currentLogLines = 0
' Write a header to the log file.
Const buildLogFile As String = "NmakeCmd.Txt"
Try
buildLogStream = new StreamWriter(buildLogFile, true)
Catch e As Exception
Console.WriteLine("Could not open output file {0}", buildLogFile)
Console.WriteLine("Exception = {0}", e.ToString())
Console.WriteLine(e.Message)
buildLogStream = Nothing
End Try
If Not buildLogStream Is Nothing Then
Console.WriteLine("Nmake output logged to {0}", _
buildLogFile)
buildLogStream.WriteLine()
buildLogStream.WriteLine(DateTime.Now.ToString())
If Not String.IsNullOrEmpty(nmakeArguments) Then
buildLogStream.Write("Command line = NMake {0}", _
nmakeArguments)
Else
buildLogStream.Write("Command line = Nmake")
End If
buildLogStream.WriteLine()
buildLogStream.Flush()
logMutex.ReleaseMutex()
' Start the process.
Console.WriteLine()
Console.WriteLine("\nStarting Nmake command...")
Console.WriteLine()
nmakeProcess.Start()
' Start the asynchronous read of the error stream.
nmakeProcess.BeginErrorReadLine()
' Start the asynchronous read of the output stream.
nmakeProcess.BeginOutputReadLine()
' Let the nmake command run, collecting the output.
nmakeProcess.WaitForExit()
nmakeProcess.Close()
buildLogStream.Close()
logMutex.Dispose()
End If
End Sub
Private Shared Sub NMakeOutputDataHandler(sendingProcess As Object, _
outLine As DataReceivedEventArgs)
' Collect the output, displaying it to the screen and
' logging it to the output file. Cancel the read
' operation when the maximum line limit is reached.
If Not String.IsNullOrEmpty(outLine.Data) Then
logMutex.WaitOne()
currentLogLines = currentLogLines + 1
If currentLogLines > maxLogLines Then
' Display the line to the console.
' Skip writing the line to the log file.
Console.WriteLine("StdOut: {0}", outLine.Data)
Else If currentLogLines = maxLogLines Then
LogToFile("StdOut", "<Max build log limit reached!>", _
true)
' Stop reading the output streams.
Dim p As Process = sendingProcess
If Not (p Is Nothing) Then
p.CancelOutputRead()
p.CancelErrorRead()
End If
Else
' Write the line to the log file.
LogToFile("StdOut", outLine.Data, true)
End If
logMutex.ReleaseMutex()
End If
End Sub
Private Shared Sub NMakeErrorDataHandler(sendingProcess As Object, _
errLine As DataReceivedEventArgs)
' Collect the error output, displaying it to the screen and
' logging it to the output file. Cancel the error output
' read operation when the maximum line limit is reached.
If Not String.IsNullOrEmpty(errLine.Data) Then
logMutex.WaitOne()
currentLogLines = currentLogLines + 1
If currentLogLines > maxLogLines Then
' Display the line to the console.
' Skip writing the line to the log file.
Console.WriteLine("StdErr: {0}", errLine.Data)
Else If currentLogLines = maxLogLines Then
LogToFile("StdErr", "<Max build log limit reached!>", _
true)
' Stop reading the output streams.
Dim p As Process = sendingProcess
If Not (p Is Nothing) Then
p.CancelOutputRead()
p.CancelErrorRead()
End If
Else
' Write the line to the log file.
LogToFile("StdErr", errLine.Data, true)
End If
logMutex.ReleaseMutex()
End If
End Sub
Private Shared Sub LogToFile(logPrefix As String, _
logText As String, _
echoToConsole As String)
' Write the specified line to the log file stream.
Dim logString As StringBuilder = New StringBuilder()
If Not String.IsNullOrEmpty(logPrefix) Then
logString.AppendFormat("{0}> ", logPrefix)
End If
If Not String.IsNullOrEmpty(logText) Then
logString.Append(logText)
End If
If Not buildLogStream Is Nothing Then
buildLogStream.WriteLine("[{0}] {1}", _
DateTime.Now.ToString(), logString.ToString())
buildLogStream.Flush()
End If
If echoToConsole Then
Console.WriteLine(logString.ToString())
End If
End Sub
End Class
Açıklamalar
BeginOutputReadLine akışta StandardOutput zaman uyumsuz bir okuma işlemi başlatır. CancelOutputRead zaman uyumsuz okuma işlemini sonlandırır.
İptal ettikten sonra, yeniden çağırarak BeginOutputReadLine zaman uyumsuz okuma işlemlerini sürdürebilirsiniz.
çağrısı CancelOutputReadyaptığınızda için devam eden tüm okuma işlemleri StandardOutput tamamlanır ve olay işleyicisi devre dışı bırakılır. Diğer tüm yeniden yönlendirilen çıkışlar StandardOutput arabelleğe kaydedilir. çağrısıyla BeginOutputReadLineolay işleyicisini yeniden etkinleştirirseniz, kaydedilen çıkış olay işleyicisine gönderilir ve zaman uyumsuz okuma işlemleri sürdürülür. Zaman uyumsuz okuma işlemlerine devam etmeden önce olay işleyicisini değiştirmek istiyorsanız, yeni olay işleyicisini eklemeden önce mevcut olay işleyicisini kaldırmanız gerekir:
// At this point the DataReceivedEventHandler(OutputHandler1)
// has executed a CancelOutputRead.
// Remove the prior event handler.
process.OutputDataReceived -=
new DataReceivedEventHandler(OutputHandler1);
// Register a new event handler.
process.OutputDataReceived +=
new DataReceivedEventHandler(OutputHandler2);
// Call the corresponding BeginOutputReadLine.
process.BeginOutputReadLine();
Note
Yeniden yönlendirilen StandardOutput akışta zaman uyumsuz ve zaman uyumlu okuma işlemlerini karıştıramazsınız. Bir öğesinin yeniden yönlendirilen akışı Process zaman uyumsuz veya zaman uyumlu modda açıldıktan sonra, bu akıştaki diğer tüm okuma işlemleri aynı modda olmalıdır. Zaman uyumsuz okuma işlemini StandardOutput iptal ederseniz ve ardından akıştan yeniden okumanız gerekiyorsa, zaman uyumsuz okuma işlemlerini sürdürmek için komutunu kullanmanız BeginOutputReadLine gerekir. , veya gibi zaman uyumlu okuma yöntemlerine yönelik bir çağrıyla izlemeyin CancelOutputReadStandardOutput.ReadReadLineReadToEnd
