在WPF程式中嵌入Win32程式。

阿新 • • 發佈：2019-02-17

小結重寫BuildWindowCore，返回一個Win32的視窗指標，並將Win32視窗的父視窗設定成BuildWindowCore傳入的視窗控制代碼。需要注意的是Win32視窗Style增加WS_STYLE屬性。

public class EmbeddedApp : HwndHost
    {
        [DllImport("user32.dll")]
        private static extern int SetParent(IntPtr hWndChild, IntPtr hWndParent);
        [DllImport("user32.dll", SetLastError = true, CharSet = CharSet.Auto)]
        private static extern uint SetWindowLong(IntPtr hwnd, int nIndex, uint newLong);
        [DllImport("user32.dll", SetLastError = true, CharSet = CharSet.Auto)]
        private static extern uint GetWindowLong(IntPtr hwnd, int nIndex);
    
        [DllImport("user32.dll")]
        private static extern int EnumWindows(CallBackPtr callPtr, ref WindowInfo WndInfoRef);
        [DllImport("User32.dll")]
        static extern int GetWindowText(IntPtr handle, StringBuilder text, int MaxLen);
        [DllImport("user32.dll")]
        public static extern int GetWindowRect(IntPtr hwnd, ref RECT rc);
        internal const int
            GWL_WNDPROC = (-4),
            GWL_HINSTANCE = (-6),
            GWL_HWNDPARENT = (-8),
            GWL_STYLE = (-16),
            GWL_EXSTYLE = (-20),
            GWL_USERDATA = (-21),
            GWL_ID = (-12);
        internal const uint
              WS_CHILD = 0x40000000,
              WS_VISIBLE = 0x10000000,
              LBS_NOTIFY = 0x00000001,
              HOST_ID = 0x00000002,
              LISTBOX_ID = 0x00000001,
              WS_VSCROLL = 0x00200000,
              WS_BORDER = 0x00800000,
              WS_POPUP = 0x80000000;
        private const int HWND_TOP = 0x0;
        private const int WM_COMMAND = 0x0112;
        private const int WM_QT_PAINT = 0xC2DC;
        private const int WM_PAINT = 0x000F;
        private const int WM_SIZE = 0x0005;
        private const int SWP_FRAMECHANGED = 0x0020;
        private Border WndHoster;
        private double screenW, screenH;
        private System.Diagnostics.Process appProc;
        private uint oldStyle;
        private IntPtr hwndHost;
        private String appPath;
        public EmbeddedApp(Border b, double sW, double sH, String p, String f)
        {
            WndHoster = b;
            screenH = sH;
            screenW = sW;
            appPath = p;
            WinInfo = new WindowInfo();
            WinInfo.winTitle = f;
        }
        protected override HandleRef BuildWindowCore(HandleRef hwndParent)
        {
            hwndHost = FindTheWindow();
            if (hwndHost == null)
            {
                appProc = new System.Diagnostics.Process();
                appProc.StartInfo.FileName = appPath;
                appProc.Start();
                Thread.Sleep(1000);
                hwndHost = FindTheWindow();
            }
            // 嵌入在HwnHost中的視窗必須要 設定為WS_CHILD風格 
            oldStyle = GetWindowLong(hwndHost, GWL_STYLE);
            uint newStyle = oldStyle;
            //WS_CHILD和WS_POPUP不能同時存在。有些Win32視窗，比如QQ的視窗，有WS_POPUP屬性，這樣嵌入的時候會導致程式錯誤
            newStyle |= WS_CHILD;
            newStyle &= ~WS_POPUP;
            SetWindowLong(hwndHost, GWL_STYLE, newStyle);
            //將視窗居中，實際上是將視窗的容器居中
            RePosWindow(WndHoster, screenW, screenH);
            //將netterm的父視窗設定為HwndHost 
            SetParent(hwndHost, hwndParent.Handle);
            return new HandleRef(this, hwndHost);
        }
        protected override void DestroyWindowCore(System.Runtime.InteropServices.HandleRef hwnd)
        {
            SetWindowLong(hwndHost, GWL_STYLE, oldStyle);
            SetParent(hwndHost, (IntPtr)0);
        }

[StructLayout(LayoutKind.Sequential)]
        public struct RECT
        {
            public int left;
            public int top;
            public int right;
            public int bottom;
        }
        [StructLayout(LayoutKind.Sequential)]
        public struct WindowInfo
        {
            public String winTitle;
            public RECT r;
            public IntPtr hwnd;
        }
        public delegate bool CallBackPtr(IntPtr hwnd, ref WindowInfo WndInfoRef);
        private static CallBackPtr callBackPtr;
        private WindowInfo WinInfo;
        public static bool CallBackProc(IntPtr hwnd, ref WindowInfo WndInfoRef)
        {
            StringBuilder str = new StringBuilder(512);
            GetWindowText(hwnd, str, str.Capacity);
            if (str.ToString().IndexOf(WndInfoRef.winTitle, 0) >= 0)
            {
                WndInfoRef.hwnd = hwnd;
                GetWindowRect(hwnd, ref (WndInfoRef.r));
            }
            
            return true;
        }
        public IntPtr FindTheWindow()
        {
            callBackPtr = new CallBackPtr(CallBackProc);
            EnumWindows(callBackPtr, ref WinInfo);
            return WinInfo.hwnd;
        }
        public void RePosWindow(Border b, double screenW, double screenH)
        {
            double width = WinInfo.r.right - WinInfo.r.left;
            double height = WinInfo.r.bottom - WinInfo.r.top;
            double left = (screenW - width) / 2;
            double right = (screenW - width) / 2;
            double top = (screenH - height) / 2;
            double bottom = (screenH - height) / 2;
            b.Margin = new Thickness(left, top, right, bottom);
        }
    }
使用示例：
    在XAML中增加一個Border元素WndHost。然後在WPF程式的建構函式中新增如下程式碼
================================
            this.InitializeComponent();
            String path;
            RegistryKey hkml = Registry.LocalMachine;
            RegistryKey softWare = hkml.OpenSubKey("SOFTWARE");
            RegistryKey TX = softWare.OpenSubKey("Tencent");
            RegistryKey QQ2009 = TX.OpenSubKey("QQ2009");
            path = QQ2009.GetValue("install").ToString() + "//bin//QQ.exe";
            EmbeddedApp ea = new EmbeddedApp(WndHost, this.Width, this.Height, path,"QQ2010");
            WndHost.Child = ea;
            EmbeddedApp ea = new EmbeddedApp(WndHost, this.Width, this.Height, path,"QQ2010");
            WndHost.Child = ea;

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