DesktopScreenShare.cs

using UnityEngine;
using UnityEngine.UI;
using System.Collections.Generic;
using System.Linq;

using agora_gaming_rtc;
using AgoraNative;

/// <summary>
/// this is an example of using ScreenSharing APIs for Desktops
/// </summary>
public class DesktopScreenShare : PlayerViewControllerBase
{

    Dropdown WindowOptionDropdown;

#if UNITY_EDITOR_WIN || UNITY_STANDALONE_WIN
    readonly List<AgoraNativeBridge.RECT> WinDisplays = new List<AgoraNativeBridge.RECT>();
#else
    List<uint> MacDisplays;
#endif
    int CurrentDisplay = 0;

    protected override void SetupUI()
    {
        base.SetupUI();

        Dropdown dropdown = GameObject.Find("Dropdown").GetComponent<Dropdown>();
        if (dropdown != null)
        {
#if UNITY_STANDALONE_OSX || UNITY_EDITOR_OSX
            MacDisplays = AgoraNativeBridge.GetMacDisplayIds();
            WindowList list = AgoraNativeBridge.GetMacWindowList();
            if (list != null)
            {
                dropdown.options = list.windows.Select(w =>
                    new Dropdown.OptionData(w.kCGWindowOwnerName + " | " + w.kCGWindowNumber)).ToList();
            }
#elif UNITY_EDITOR_WIN || UNITY_STANDALONE_WIN
            // Monitor Display info
            var winDispInfoList = AgoraNativeBridge.GetWinDisplayInfo();
            if (winDispInfoList != null)
            {
                foreach (var dpInfo in winDispInfoList)
                {
                    Debug.Log("Adding display:" + WinDisplays.Count);
                    WinDisplays.Add(dpInfo.MonitorInfo.monitor);
                }
            }

            // Window ID info
            Dictionary<string, System.IntPtr> winWinIdList;
            AgoraNativeBridge.GetDesktopWindowHandlesAndTitles(out winWinIdList);
            if (winWinIdList != null)
            {
                dropdown.options = (winWinIdList.Select(w =>
                    new Dropdown.OptionData(string.Format("{0, -20} | {1}",
                        w.Key.Substring(0, System.Math.Min(w.Key.Length, 20)), w.Value))).ToList());
            }
#endif
            WindowOptionDropdown = dropdown;
        }

        Button button = GameObject.Find("ShareWindowButton").GetComponent<Button>();
        if (button != null)
        {
            button.onClick.AddListener(OnShareWindowClick);
        }

        button = GameObject.Find("ShareDisplayButton").GetComponent<Button>();
        if (button != null)
        {
            button.onClick.AddListener(ShareDisplayScreen);
        }

        button = GameObject.Find("StopShareButton").GetComponent<Button>();
        if (button != null)
        {
            button.onClick.AddListener(() => { mRtcEngine.StopScreenCapture(); });
        }

        GameObject quad = GameObject.Find("DisplayPlane");
        if (ReferenceEquals(quad, null))
        {
            Debug.Log("Error: failed to find DisplayPlane");
            return;
        }
        else
        {
            quad.AddComponent<VideoSurface>();
        }
    }

    void ShareDisplayScreen()
    {
        ScreenCaptureParameters sparams = new ScreenCaptureParameters
        {
            captureMouseCursor = true,
            frameRate = 15
        };

        mRtcEngine.StopScreenCapture();

#if UNITY_EDITOR_OSX || UNITY_STANDALONE_OSX
        mRtcEngine.StartScreenCaptureByDisplayId(MacDisplays[CurrentDisplay], default(Rectangle), sparams); 
        CurrentDisplay = (CurrentDisplay + 1) % MacDisplays.Count;
#elif UNITY_EDITOR_WIN || UNITY_STANDALONE_WIN
        mRtcEngine.StartScreenCaptureByDisplayId((uint)CurrentDisplay, default(Rectangle), sparams); 
        CurrentDisplay = (CurrentDisplay + 1) % WinDisplays.Count;
#endif
    }

    void OnShareWindowClick()
    {
        char[] delimiterChars = { '|' };
        if (WindowOptionDropdown == null) return;
        string option = WindowOptionDropdown.options[WindowOptionDropdown.value].text;
        if (string.IsNullOrEmpty(option))
        {
            return;
        }

        string wid = option.Split(delimiterChars, System.StringSplitOptions.RemoveEmptyEntries)[1];
        Debug.LogWarning(wid + " is chosen");
        mRtcEngine.StopScreenCapture();

        mRtcEngine.StartScreenCaptureByWindowId(int.Parse(wid), default(Rectangle), default(ScreenCaptureParameters));
    }
}