This is the eighth part of the Concurrency series. For your convenience you can find other parts in the table of contents in Part 1 – Mutex performance in .NET We know how to use global mutexes to synchronize processes. However, there is…
This is the seventh part of the Concurrency series. For your convenience you can find other parts in the table of contents in Part 1 – Mutex performance in .NET Last time we examined an interesting behavior of Mutex when it is abandoned.…
Today very simple trick to capture whole output from Powershell. Let’s see those files: 1.ps1
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echo "1_1 STD OUT" write-host "1_2 HOST OUT" write-error "1_3 STD ERR" .\2.ps1 |
2.ps1
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echo "2_1 STD OUT" write-host "2_2 HOST OUT" write-error "2_3 STD ERR" .\3.bat |
3.bat
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echo "3_1 STD OUT" echo "3_2 STD ERR" 1>&2 echo "3_2 STD 3" 1>&3 cscript 4.vbs |
4.vbs
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Wscript.Echo "4_1 STD OUT" Set fso = CreateObject ("Scripting.FileSystemObject") Set stdout = fso.GetStandardStream (1) Set stderr = fso.GetStandardStream (2) stdout.WriteLine "4_2 STD OUT" stderr.WriteLine "4_3 STD ERR" Set WshShell = CreateObject("WScript.Shell") Set WshShellExec = WshShell.Exec("5.exe") WScript.StdOut.Write WshShellExec.StdOut.ReadAll WScript.StdErr.Write WshShellExec.StdErr.ReadAll |
5.exe
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#include <iostream> #include <cstdlib> int main() { std::cout << "5_1 STD OUT" << "\n"; std::cerr << "5_2 STD ERR" << "\n"; system("6.exe"); } |
6.exe
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#include <iostream> #include <cstdlib> int main() { std::cout << "6_1 STD OUT" << "\n"; std::cerr << "6_2 STD ERR" << "\n"; } |
Let’s now run this with powershell:
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PS C:\Afish\Playground> .\1.ps1 1_1 STD OUT 1_2 HOST OUT C:\Afish\Playground\1.ps1 : 1_3 STD ERR At line:1 char:1 + .\1.ps1 + ~~~~~~~ + CategoryInfo : NotSpecified: (:) [Write-Error], WriteErrorException + FullyQualifiedErrorId : Microsoft.PowerShell.Commands.WriteErrorException,1.ps1 2_1 STD OUT 2_2 HOST OUT C:\Afish\Playground\2.ps1 : 2_3 STD ERR At C:\Afish\Playground\1.ps1:5 char:1 + .\2.ps1 + ~~~~~~~ + CategoryInfo : NotSpecified: (:) [Write-Error], WriteErrorException + FullyQualifiedErrorId : Microsoft.PowerShell.Commands.WriteErrorException,2.ps1 C:\Afish\Playground>echo "3_1 STD OUT" "3_1 STD OUT" C:\Afish\Playground>echo "3_2 STD ERR" 1>&2 "3_2 STD ERR" C:\Afish\Playground>echo "3_2 STD 3" 1>&3 "3_2 STD 3" C:\Afish\Playground>cscript 4.vbs Microsoft (R) Windows Script Host Version 5.812 Copyright (C) Microsoft Corporation. All rights reserved. 4_1 STD OUT 4_2 STD OUT 4_3 STD ERR 5_1 STD OUT 6_1 STD OUT 5_2 STD ERR 6_2 STD ERR |
Okay, we have all STD OUT and STD ERR streams.…
Posts
- Concurrency Part 8 — Tracking mutex owner October 19, 2019
- Concurrency Part 7 — Semaphores trickery October 12, 2019
- Capturing all output in Powershell October 5, 2019