C#•2y ago

❔ Console.ReadKey() blocking

Hey there. I have this function that is called every frame:

public void Update()
{
    if ( !Console.KeyAvailable ) return;

    var key = Console.ReadKey(intercept: true);
}

public void Update()
{
    if ( !Console.KeyAvailable ) return;

    var key = Console.ReadKey(intercept: true);
}

It blocks until a key is pressed instead of setting KeyAvailable back to false... I know this is being called every frame because I can insert a Debug.Log(); return; at the top and I will see it log every frame. However if I put the Debug.Log() after the ReadKey(), it only gets called when you press keys.

10 Replies

Buddy•2y ago

ReadKey is blocking Also, is this Unity?? There is no console associated with Unity. Do not use the Console class (for Unity)

aaron.frost•2y ago

It is a dedicated server console window It is spun up with

[DllImport( "kernel32.dll", SetLastError = true )]
        static extern bool AllocConsole();

[DllImport( "kernel32.dll", SetLastError = true )]
        static extern bool AllocConsole();

This is Unity

aaron.frost•2y ago

https://pastebin.com/h2pWy8Sr

Pastebin

ConsoleWindow.cs - Pastebin.com

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aaron.frost•2y ago

https://pastebin.com/3H5cZJ52

Pastebin

ConsoleInput.cs - Pastebin.com

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aaron.frost•2y ago

ConsoleInput.Update() is the function causing the problem

Buddy•2y ago

Well, tough sh*t. ReadKey is blocking. You can maybe use GetAsyncKeyState? https://learn.microsoft.com/en-us/windows/win32/api/winuser/nf-winuser-getasynckeystate But if you want an in-game console window, you can just set up Dear Imgui, or make your own. And I don't recommend using P/Invoke to Windows API in Unity since that will cause issues with cross-platform. Maybe you want to publish for Mac, and whoops. It does not have Windows API. There goes your console Window, and possibly crashes.

arion•2y ago

Unity also has an input system you can check out, no windows apis needed

aaron.frost•2y ago

Input System doesn't work because Unity is running in batchmode I'll try GetAsyncKeyState

Jester•2y ago

try raw input maybe shouldnt unity have that?

Accord•2y ago

Was this issue resolved? If so, run /close - otherwise I will mark this as stale and this post will be archived until there is new activity.

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❔ Console.ReadKey() blocking