$host.UI.RawUI.ReadKey("NoEcho,IncludeKeyDown")Īs you can tell, there are a number of different options, each with their benefits and drawbacks.Non-native methods are defined as programs that are specific to Windows and Linux that could be used in conjunction with PowerShell. By native we refer to those commands that are PowerShell or. What are the different ways to pause script execution? In this article, we are going to break down the ability to pause into either native and non-native commands. Since PowerShell is often used as a way to “glue” different technologies together, just like in Windows, the Linux command-line has its options for pausing execution which can be incorporated into PowerShell as well. Adding in another wrinkle to the available options is the new cross-platform ability of PowerShell. Depending on what you are trying to accomplish, the method of pausing you choose will have its strengths and weaknesses. As with most tasks in Powershell, there is more than one way to pause a script. Perhaps a script needs to wait for user input, slow down execution speed, or wait for another process to conclude before moving forward. These names differ slightly, but the codes are identical.Īs you see, the console API and has no equivalents for modifier keys like Alt, Control, and Shift, as well as other function keys such as CapsLock and NumLock, and Mouse Keys and scroll wheel, because the console API cannot test isolated key presses for special keys.There are many reasons to pause script execution. In the table below, you find the key names both for and. The console API shares the same key codes with the Windows API. You can use the tolook up the codes you need. This implements a simple “pause” command like the blocking Wait-KeyPress which lets you fully customize the message, colors, and the actual key to wait for:įunction Test-KeyPress while ( $true ) You can still use the console API to implement a number of useful things - provided you don’t care much about code compatibility to non-console PowerShell hosts like the ISE. ReadKey() does report back modifier keys that were pressed when a regular key was pressed, so you can test for key combinations such as Ctrl+Shift+U, but you cannot detect whether Ctrland/or Shiftis currently pressed unless the user also presses a regular key.Īgain, I encourage you to run the code above and test the results for different keys and key-modifier-combinations.įinally, you’ll soon realize that a lot of key-combinations are already in use by VSCode and will be processed before ReadKey() even had a chance to capture and detect them. You can’t detect pressed modifier keys alone, so you can’t figure out whether Ctrl is currently pressed. You may want to test for yourself: run the code above in a PowerShell console and in VSCode and notice the different behavior). VSCode keeps an interactive console in the background which makes reading input from the console possible but somewhat unreliable: VSCode will always echo the pressed key and seems to ignore the modifier key Alt. ISE has no interactive console, so reading keys via the console API won’t work at all. Detecting key presses via the console API is straight-forward and requires only a few lines of code, but it also has severe limitations:
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