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：/article/8930046.html，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