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1604784669
Use `WaitForPipeDrain` to deterministically wait for the pipe to drain instead of using `Start-Sleep`. Use `Dispose` instead of `Close` to properly flush and close the pipe stream. Add error handling for connection timeout and I/O errors. Handle `ERROR_BROKEN_PIPE` separately when peeking at pipe, as this happens when the pipe is disconnected immediately after connecting it or after reading the previous message. Don't ignore `ERROR_BAD_PIPE` anymore, as the pipe should never be in a disconnected (i.e. bad) state at this point of the function.
42 lines
1.3 KiB
PowerShell
42 lines
1.3 KiB
PowerShell
# This PowerShell script connects to a Named Pipe server,
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# sends one message and then disconnects again.
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# The first argument is the name of the pipe.
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# The second argument is the message to send.
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if ($args.length -lt 2) {
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Write-Output "Usage: ./send_named_pipe.ps1 <pipename> <message> [message] ... [message]"
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exit -1
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}
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$Wrapper = [pscustomobject]@{
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Pipe = new-object System.IO.Pipes.NamedPipeClientStream(
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".",
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$args[0],
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[System.IO.Pipes.PipeDirection]::InOut,
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[System.IO.Pipes.PipeOptions]::None,
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[System.Security.Principal.TokenImpersonationLevel]::Impersonation
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)
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Reader = $null
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Writer = $null
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}
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try {
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$Wrapper.Pipe.Connect(5000)
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$Wrapper.Reader = New-Object System.IO.StreamReader($Wrapper.Pipe)
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$Wrapper.Writer = New-Object System.IO.StreamWriter($Wrapper.Pipe)
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$Wrapper.Writer.AutoFlush = $true
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for ($i = 1; $i -lt $args.length; $i++) {
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$Wrapper.Writer.WriteLine($args[$i])
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}
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# Wait for pipe contents to be read.
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$Wrapper.Pipe.WaitForPipeDrain()
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# Dispose the pipe, which also calls Flush and Close.
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$Wrapper.Pipe.Dispose()
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# Explicity set error level 0 for success, as otherwise the current error level is kept.
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exit 0
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} catch [TimeoutException] {
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Write-Output "Timeout connecting to pipe"
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exit 1
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} catch [System.IO.IOException] {
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Write-Output "Broken pipe"
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exit 2
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}
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