C# 自己动手实现Spy++（一）

因为项目要用到获取其他程序的标题，就想到了用Spy++,但是它是一个工具，并没有C#的源代码，所以就想探索下他的原理，网上搜索了下spy++的源代码，找到了一篇：http://blog.csdn.net/asanscape/article/details/2140176，是用VC写的，又从CSDN下载了一个资源：http://download.csdn.net/detail/zjhzznzlx/2720998#comment，发现是用C#写的，就打开看看，就找到了关键的几句：

IntPtr hWnd = Win32.WindowFromPoint(Cursor.Position);   //最关键的一句

if (OldWnd != IntPtr.Zero && OldWnd != hWnd)

    {

     Refresh(OldWnd); //erase old window

    }

if (hWnd == IntPtr.Zero)

    {

     textBox1.Text = null;

     textBox2.Text = null;

     textBox3.Text = null;

     textBox4.Text = null;

     textBox5.Text = null;

    }

    else

    {

     OldWnd = hWnd;

textBox1.Text = string.Format("{0}", hWnd.ToInt32().ToString());

textBox3.Text = this.GetClassName(hWnd);

textBox2.Text = this.GetWindowText(hWnd);

Win32.GetWindowInfo (hWnd,ref win);

     textBox4.Text =win.exStyle .ToString ();

     Win32.Rect rc = new Win32.Rect();

     Win32.GetWindowRect(hWnd, ref rc);

     textBox5.Text = string.Format("[{0} x {1}], ({2},{3})-({4},{5})", rc.right - rc.left, rc.bottom - rc.top, rc.left, rc.top, rc.right, rc.bottom);

this.Highlight(hWnd);

    }

其中第一句最重要：

ntPtr hWnd = Win32.WindowFromPoint(Cursor.Position);

，找到了句柄就可以根据句柄找到相关的窗口标题、类名、大小、坐标等信息。

发现他是引用了一个DLL:"win32GDI.dll",然后上网搜索并没有找到这个DLL，估计是作者自己封装的，然后就再找WindowFromPoint这个函数，这个函数根据名字就很好理解它的功能，就是根据坐标获取窗口，在网上找到了这个是windows的API函数，直接引用即可，只不过这个函数的原型为：

[DllImport("user32.dll", EntryPoint = "WindowFromPoint")]//指定坐标处窗体句柄       

         public static extern IntPtr WindowFromPoint(int xPoint, int yPoint);

这里面有两个参数，即X,Y坐标，作者那里把它改为一个参数point类型。

同理找到其他API函数原型：

[DllImport("user32.dll", EntryPoint = "WindowFromPoint")]//指定坐标处窗体句柄       

        public static extern IntPtr WindowFromPoint(int xPoint, int yPoint);

[DllImport("user32.dll")]

        public extern static int GetWindowText(IntPtr hWnd, StringBuilder lpString, int nMaxCount);

[DllImport("user32.dll", SetLastError = true, CharSet = CharSet.Auto)]

        public static extern int GetClassName(IntPtr hWnd, StringBuilder lpClassName, int nMaxCount);

[DllImport("user32.dll")]

        private static extern int GetWindowRect(IntPtr hwnd, ref  Rectangle lpRect);

[DllImport("User32.dll")]

        private static extern IntPtr GetWindowDC(IntPtr hwnd);

[DllImport("user32.dll", CharSet = CharSet.Auto, ExactSpelling = true)]

        public static extern bool RedrawWindow(IntPtr hwnd, COMRECT rcUpdate, IntPtr hrgnUpdate, int flags);

[DllImport("user32.dll", CharSet = CharSet.Auto, ExactSpelling = true)]

        public static extern bool UpdateWindow(IntPtr hWnd);

[DllImport("user32.dll", CharSet = CharSet.Auto, ExactSpelling = true)]

        public static extern bool InvalidateRect(IntPtr hWnd, COMRECT rect, bool erase);

通过以上函数就可以实现获取窗口的句柄、标题、类型、大小、坐标等。然而实现高亮的时候代码还是有点问题：

public void Highlight(IntPtr hWnd)  //高亮其实就是用Pen绘制一个和窗口大小一样的红色框

        {

            const float penWidth = 3;

            Win32.Rect rc = new Win32.Rect();

            Win32.GetWindowRect(hWnd, ref rc);

IntPtr hDC = Win32.GetWindowDC(hWnd);

            if (hDC != IntPtr.Zero)

            {

                using (Pen pen = new Pen(Color.Red, penWidth))

                {

                    using (Graphics g = Graphics.FromHdc(hDC))

                    {

                        Font font = new Font("Courer New", 9, FontStyle.Bold);

                        g.DrawRectangle(pen, 0, 0, rc.right - rc.left - (int)penWidth, rc.bottom - rc.top - (int)penWidth);

                        g.DrawString("BIC Tech <SPY>", font, Brushes.Red, 5, 5);

                    }

                }

            }

            Win32.ReleaseDC(hWnd, hDC);

        }

        public void Highlight2(IntPtr hWnd)  //我的代码，尚有问题

        {

            const float penWidth = 3;

            Rectangle rc = new Rectangle();

            GetWindowRect(hWnd, ref rc);

IntPtr hDC = GetWindowDC(hWnd);

            if (hDC != IntPtr.Zero)

            {

                using (Pen pen = new Pen(Color.Red, penWidth))

                {

                    using (Graphics g = Graphics.FromHdc(hDC))

                    {

                        Font font = new Font("Courer New", 9, FontStyle.Bold);

                        g.DrawRectangle(pen, 0, 0, rc.Right - rc.Left - (int)penWidth, rc.Bottom - rc.Top - (int)penWidth);

                        g.DrawString("BIC Tech <SPY>", font, Brushes.Red, 5, 5);

                    }

                }

            }

            Win32.ReleaseDC(hWnd, hDC);

        }

        public void Refresh(IntPtr hWnd)

        {

            Win32.InvalidateRect(hWnd, IntPtr.Zero, 1 /* TRUE */);

            Win32.UpdateWindow(hWnd);

            Win32.RedrawWindow(hWnd, IntPtr.Zero, IntPtr.Zero, Win32.RDW_FRAME | Win32.RDW_INVALIDATE | Win32.RDW_UPDATENOW | Win32.RDW_ALLCHILDREN);

        }

        public void Refresh2(IntPtr hWnd)  //我的代码，尚有问题

        {

            InvalidateRect(hWnd,new COMRECT(0,0,0,0),true);

            UpdateWindow(hWnd);

            RedrawWindow(hWnd, new COMRECT(0, 0, 0, 0), IntPtr.Zero, Win32.RDW_FRAME | Win32.RDW_INVALIDATE | Win32.RDW_UPDATENOW | Win32.RDW_ALLCHILDREN);

        }

今天就暂时到这里，基本上实现了获取窗口的句柄、标题、类型、大小、坐标等功能，高亮功能留待后续研究。

代码下载地址：

http://download.csdn.net/detail/xtfnpgy/5862401

开发环境：VS2008