如何在PowerShell脚本中正确执行C#代码实现媒体播放/暂停？

Let's break down the key issues with your current implementation:

1. Private Methods Can't Be Called Externally: Your button1_Click methods are marked private, which means PowerShell can't access them directly from outside the class. These methods are designed to trigger from UI button clicks, not manual invocation.

2. Incomplete Key Simulation: The keybd_event function requires both a key down and key up event to properly simulate a media key press. Your code only sends the key down event, so the system doesn't register a full, valid key press.

3. Typo in Constant Name: You have a typo in KEYEVENTF_EXTENTEDKEY — it should be KEYEVENTF_EXTENDEDKEY.

4. Instance Method Misuse: The button click methods are instance methods, meaning you'd need to create an instance of Form1 to use them (which is unnecessary here since you're not building a UI).

Here's a revised version that fixes all these issues. We'll create a simple static class with public methods to handle media key presses correctly:

Add-Type @'
using System;
using System.Runtime.InteropServices;

namespace UniversalSandbox {
    public static class MediaKeys {
        // Corrected constant names and values
        private const int KEYEVENTF_EXTENDEDKEY = 0x0001;
        private const int KEYEVENTF_KEYUP = 0x0002;
        private const int VK_MEDIA_PLAY_PAUSE = 0xB3;
        private const int VK_MEDIA_PREV_TRACK = 0xB1;
        private const int VK_MEDIA_NEXT_TRACK = 0xB0;

        // Correct P/Invoke signature for keybd_event
        [DllImport("user32.dll")]
        private static extern void keybd_event(byte bVk, byte bScan, uint dwFlags, UIntPtr dwExtraInfo);

        // Public static methods to trigger media actions
        public static void PlayPause() {
            SimulateKeyPress(VK_MEDIA_PLAY_PAUSE);
        }

        public static void PreviousTrack() {
            SimulateKeyPress(VK_MEDIA_PREV_TRACK);
        }

        public static void NextTrack() {
            SimulateKeyPress(VK_MEDIA_NEXT_TRACK);
        }

        // Helper method to send full key down + up events
        private static void SimulateKeyPress(byte keyCode) {
            // Send key down event
            keybd_event(keyCode, 0, KEYEVENTF_EXTENDEDKEY, UIntPtr.Zero);
            // Send key up event to complete the press
            keybd_event(keyCode, 0, KEYEVENTF_EXTENDEDKEY | KEYEVENTF_KEYUP, UIntPtr.Zero);
        }
    }
}
'@

Now you can call the static methods directly from PowerShell to control media playback:

# Toggle play/pause
[UniversalSandbox.MediaKeys]::PlayPause()

# Skip to previous track
[UniversalSandbox.MediaKeys]::PreviousTrack()

# Skip to next track
[UniversalSandbox.MediaKeys]::NextTrack()

• This works by simulating physical media key presses, so it will work with any media player that responds to system-wide media key commands.
• If you still don't see a response, ensure your media player is either the active window or configured to listen for global media keys.

内容的提问来源于stack exchange，提问作者BananaMaster