目前最通用的客户端调用3D的方式，就是WPF程序通过Process启动Unity3D的exe进程，直接上代码：
//开启3D进程
internal void Create3DProcess(string processUri)
{
if (string.IsNullOrWhiteSpace(processUri) || !File.Exists(processUri))
{
return;
//throw new Exception("Unable to find Unity window,File was not exit");
}
var handle = Panel.Handle;
this.Dispatcher.InvokeAsync(() =>
{
try
{ //判断当前要启动的进程是否还在启动，如果还在启动，先关闭进程再创建进程
CheckProcessByName(processUri); if (process != null)
{
process.Close();
} process = new Process();
process.StartInfo.Arguments = "-parentHWND " + handle.ToInt32() + " " + Environment.CommandLine + " " + Unity3DProcessArges.Replace("AutoWidth",Panel.Width.ToString()).Replace("AutoHeight",Panel.Height.ToString());
process.StartInfo.FileName = processUri;
process.StartInfo.WorkingDirectory = System.IO.Path.GetDirectoryName(processUri);
process.StartInfo.UseShellExecute = true;
process.StartInfo.CreateNoWindow = true;
process.Start();
process.WaitForInputIdle();
EnumChildWindows(handle, WindowEnum, IntPtr.Zero);
}
catch (Exception ex)
{
LogHelper.Error(ex.ToString());
}
}); } [DllImport("user32.dll")]
public static extern bool EnumChildWindows(IntPtr hwnd, WindowEnumProc func, IntPtr lParam);
启动进程后，在做WPF应用上的交互，比如点击了WPF上的一个按钮，当前的鼠标的焦点会被WPF程序捕获到，如果3D程序进程没有做键盘或者鼠标焦点的获取，就会出现键盘和鼠标事件无法触发！
大概的解决思路：在WPF程序上，获取鼠标滑动的窗体的句柄，判断当前鼠标停留的窗体的句柄如果跟3D程序的窗体句柄一样，则激活3D窗体程序（需要用到user32的API），直接上代码：
1 private IntPtr unityHWND = IntPtr.Zero; //3D窗体的句柄
2 /// <summary>
3 /// 发送消息，触发激活当前窗体
4 /// </summary>
5 internal void ActiveWindows()
6 {
7
8 if (unityHWND!=IntPtr.Zero)
9 {
10 SendMessage(unityHWND, WM_ACTIVATE, WA_ACTIVE, IntPtr.Zero);
11 }
12 }
13
14 /// <summary>
15 /// 解除激活窗体
16 /// </summary>
17 internal void UnActiveWindows()
18 {
19 if (unityHWND!=IntPtr.Zero)
20 {
21 SendMessage(unityHWND, WM_ACTIVATE, WA_INACTIVE, IntPtr.Zero);
22 }
23 }
24
25
26 //检测窗体句柄
27 private void CheckWindowsActive()
28 {
29 actionTime = new DispatcherTimer();
30 actionTime.Interval = new TimeSpan(TimeSpan.TicksPerMillisecond * 300);
31 actionTime.Tick += ActionTime_Tick;
32 actionTime.Start();
33 }
34
35 IntPtr lastIntprt = IntPtr.Zero; //获取上一次的鼠标指向的句柄,为了指向相同的位置，避免重复给窗体发送消息
36 private void ActionTime_Tick(object sender, EventArgs e)
37 {
38 try
39 {
40 POINT pOINT;
41 bool isSuccess = GetCursorPos(out pOINT);
42 var intptr = WindowFromPoint(pOINT);
43 if (isSuccess && unityHWND != IntPtr.Zero && lastIntprt != intptr)//判断当前句柄跟上一次的句柄是否一样，如果一样就不再触发
44 {
45 if (intptr == unityHWND)
46 {
47 ActiveWindows();
48 }
49 else
50 {
51 UnActiveWindows();
52 }
53
54 }
55 lastIntprt = intptr;
56
57 }
58 catch (Exception ex)
59 {
60 LogHelper.Error(ex.ToString());
61 }
62 }
63
64 [DllImport("user32.dll", CharSet = CharSet.Auto)]
65 public static extern IntPtr SendMessage(IntPtr hWnd, UInt32 Msg, IntPtr wParam, IntPtr lParam);
66
67 [DllImport("user32.dll", CharSet = CharSet.Auto)]
68 public static extern bool GetCursorPos(out POINT pt);
69
70 [DllImport("user32.dll")]
71 public static extern IntPtr WindowFromPoint(POINT Point);
72
73 public struct POINT
74 {
75 public int X;
76 public int Y;
77 public POINT(int x, int y)
78 {
79 this.X = x;
80 this.Y = y;
81 }
82 }