实现鼠标选择矩形截图代码,CSharp代码库,德仔网

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【CSharp】实现鼠标选择矩形截图
作者:zgke / 发布于2014/7/29/ 840
当按下BUTTON1的时候可以在屏幕上选择一个矩形进行截图全部的类先建立个新项目为WINDOWS库类.这里因为需要全局钩子..我在WINFORM里不知道为什么设置不了全局钩子.但在DLL里就可以.....可恶的C#........复制下面代码到CLASS1.CS里

	使用方法

	private void button1_Click(object sender, EventArgs e)
	 {
	 s.GerScreenFormRectangle();
	
	 }
	 private Zgke.CopyScreen s;
	 private void Form1_Load(object sender, EventArgs e)
	 {
	 s = new Zgke.CopyScreen();
	 s.GetScreenImage+=new Zgke.CopyScreen.GetImage(s_GetScreenImage);
	 }

	
	 void s_GetScreenImage(Image p_Image)
	 {
	 pictureBox1.Image = p_Image;
	 }

	

	

	using System;
	using System.Collections.Generic;
	using System.Text;
	using System.Runtime.InteropServices;
	using System.Drawing;
	using System.Windows.Forms;

	namespace Zgke
	{
	 public class API
	 {
	 [DllImport("user32.dll", CharSet = CharSet.Auto)]
	 public static extern IntPtr GetDesktopWindow();

	 [DllImport("user32.dll", CharSet = CharSet.Auto)]
	 public static extern IntPtr SetWindowsHookEx(int hookid, HookProc pfnhook, IntPtr hinst, int threadid);

	 public delegate IntPtr HookProc(int nCode, IntPtr wParam, IntPtr lParam);

	 [DllImport("kernel32.dll", ExactSpelling = true, CharSet = CharSet.Auto)]
	 public static extern int GetCurrentThreadId();

	 [DllImport("user32.dll", CharSet = CharSet.Auto, ExactSpelling = true)]
	 public static extern bool UnhookWindowsHookEx(IntPtr hhook);

	
	 public enum WindowsHookCodes
	 {
	 WH_MSGFILTER = (-1),
	 WH_JOURNALRECORD = 0,
	 WH_JOURNALPLAYBACK = 1,
	 WH_KEYBOARD = 2,
	 WH_GETMESSAGE = 3,
	 WH_CALLWNDPROC = 4,
	 WH_CBT = 5,
	 WH_SYSMSGFILTER = 6,
	 WH_MOUSE = 7,
	 WH_HARDWARE = 8,
	 WH_DEBUG = 9,
	 WH_SHELL = 10,
	 WH_FOREGROUNDIDLE = 11,
	 WH_CALLWNDPROCRET = 12,
	 WH_KEYBOARD_LL = 13,
	 WH_MOUSE_LL = 14
	 }

	 }
	
	 /// <summary>
	 /// 一个根据矩形截图类
	 /// zgke@Sina.com
	 /// qq:116149
	 /// </summary>
	 public class CopyScreen
	 {
	 /// <summary>
	 /// 屏幕大小
	 /// </summary>
	 private Size ScreenSize { get { return Screen.PrimaryScreen.Bounds.Size; } }
	 /// <summary>
	 /// 鼠标位置
	 /// </summary>
	 private Point MousePoint { get { return Cursor.Position; } }
	 /// <summary>
	 /// 私有方法获取屏幕图形(全部图形)
	 /// </summary>
	 public Bitmap ScreenImage
	 {
	 get
	 {
	 Bitmap m_BackBitmap = new Bitmap(ScreenSize.Width, ScreenSize.Height);
	 Graphics _Graphics = Graphics.FromImage(m_BackBitmap);
	 _Graphics.CopyFromScreen(new Point(0, 0), new Point(0, 0), ScreenSize);
	 _Graphics.Dispose();
	 return m_BackBitmap;
	 }
	 }
	 /// <summary>
	 /// 钩子
	 /// </summary>
	 private HookMessage m_HookMessage;
	 /// <summary>
	 /// 屏幕句柄
	 /// </summary>
	 private IntPtr m_ScreenForm;
	 /// <summary>
	 /// 图形
	 /// </summary>
	 private Bitmap m_Image;

	
	 public delegate void GetImage(Image p_Image);
	 /// <summary>
	 /// 获取屏幕截图
	 /// </summary>
	 public event GetImage GetScreenImage;

	
	 /// <summary>
	 /// 构造
	 /// </summary>
	 public CopyScreen()
	 {
	 m_ScreenForm = API.GetDesktopWindow();
	 m_HookMessage = new HookMessage(API.WindowsHookCodes.WH_MOUSE_LL, true);
	 m_HookMessage.GetHook += new HookMessage.GetHookMessage(m_HookMessage_GetHook);
	 }

	 /// <summary>
	 /// 钩子事件
	 /// </summary>
	 /// <param name="p_Code"></param>
	 /// <param name="p_wParam"></param>
	 /// <param name="p_lParam"></param>
	 /// <param name="p_Send"></param>
	 void m_HookMessage_GetHook(int p_Code, IntPtr p_wParam, IntPtr p_lParam, ref bool p_Send)
	 {
	 if (m_StarMouse)
	 {
	 switch (p_wParam.ToInt32())
	 {
	 case 512: //Move
	 MouseMove();
	 break;
	 case 513: //Down
	 MouseDown();
	 p_Send = false;
	 break;
	 case 514: //Up
	 MouseUp();
	 p_Send = false;
	 break;
	 default:
	 m_StarMouse = false;
	 break;
	 }
	 }
	 }

	 /// <summary>
	 /// 根据矩形 如果Width是正直接返回 如果使-会转换成正的矩形 保证大小位置不变
	 /// </summary>
	 /// <param name="p_Rectangle">矩形</param>
	 /// <returns>正矩形</returns>
	 public static Rectangle GetUprightRectangle(Rectangle p_Rectangle)
	 {
	 Rectangle _Rect = p_Rectangle;
	 if (_Rect.Width < 0)
	 {
	 int _X = _Rect.X;
	 _Rect.X = _Rect.Width + _Rect.X;
	 _Rect.Width = _X - _Rect.X;
	 }
	 if (_Rect.Height < 0)
	 {
	 int _Y = _Rect.Y;
	 _Rect.Y = _Rect.Height + _Rect.Y;
	 _Rect.Height = _Y - _Rect.Y;
	 }
	 return _Rect;
	 }

	 private Rectangle m_MouseRectangle = new Rectangle(0, 0, 0, 0);
	 private bool m_DrawStar = false;
	 private void MouseDown()
	 {
	 m_MouseRectangle.X = MousePoint.X;
	 m_MouseRectangle.Y = MousePoint.Y;
	 m_DrawStar = true;
	 }
	 private void MouseMove()
	 {
	 if (m_DrawStar)
	 {
	 ControlPaint.DrawReversibleFrame(m_MouseRectangle, Color.Transparent, FrameStyle.Dashed);
	 m_MouseRectangle.Width = MousePoint.X - m_MouseRectangle.X;
	 m_MouseRectangle.Height = MousePoint.Y - m_MouseRectangle.Y;
	 ControlPaint.DrawReversibleFrame(m_MouseRectangle, Color.White, FrameStyle.Dashed);

	 }
	 }
	 private void MouseUp()
	 {
	 ControlPaint.DrawReversibleFrame(m_MouseRectangle, Color.Transparent, FrameStyle.Dashed);
	 m_DrawStar = false;
	 m_StarMouse = false;
	 Rectangle _ScreenRectangle = GetUprightRectangle(m_MouseRectangle);
	 m_MouseRectangle.X = 0;
	 m_MouseRectangle.Y = 0;
	 m_MouseRectangle.Width = 0;
	 m_MouseRectangle.Height = 0;
	 if (GetScreenImage != null)
	 {
	 if (_ScreenRectangle.Width != 0 && _ScreenRectangle.Height != 0) GetScreenImage(m_Image.Clone(_ScreenRectangle, m_Image.PixelFormat));
	 }
	 }
	 private bool m_StarMouse = false;

	 /// <summary>
	 /// 获取图形
	 /// </summary>
	 public void GerScreenFormRectangle()
	 {
	 m_Image = ScreenImage;
	 m_StarMouse = true;
	 }

	 /// <summary>
	 /// 获取图形
	 /// </summary>
	 public void GetScreen()
	 {
	 if (GetScreenImage != null) GetScreenImage(ScreenImage);
	 }

	 }

	
	 /// <summary>
	 /// 用钩子获取消息
	 /// zgke@Sina.com
	 /// </summary>
	 public class HookMessage
	 {
	 private IntPtr m_HookEx;
	 /// <summary>
	 /// 设置自己进程的钩子
	 /// </summary>
	 /// <param name="p_HookCodes">钩子类型</param>
	 public HookMessage(API.WindowsHookCodes p_HookCodes)
	 {
	 m_HookEx = API.SetWindowsHookEx((int)p_HookCodes, new API.HookProc(SetHookProc), IntPtr.Zero, API.GetCurrentThreadId());
	 }
	 /// <summary>
	 /// 设置进程的钩子
	 /// </summary>
	 /// <param name="p_HookCodes">钩子类型</param>
	 /// <param name="p_ThreadID">全局钩子</param>
	 public HookMessage(API.WindowsHookCodes p_HookCodes, bool p_Zero)
	 {
	 IntPtr _Value = System.Runtime.InteropServices.Marshal.GetHINSTANCE(System.Reflection.Assembly.GetExecutingAssembly().GetModules()[0]);
	 m_HookEx = API.SetWindowsHookEx((int)p_HookCodes, new API.HookProc(SetHookProc), _Value, 0);
	 }
	 /// <summary>
	 /// 关闭钩子
	 /// </summary>
	 public void UnHookMessage()
	 {
	 if (API.UnhookWindowsHookEx(m_HookEx))
	 {
	 m_HookEx = IntPtr.Zero;
	 }
	 }

	 public delegate void GetHookMessage(int p_Code, IntPtr p_wParam, IntPtr p_lParam, ref bool p_Send);
	 public event GetHookMessage GetHook;

	 private IntPtr SetHookProc(int p_Code, IntPtr p_wParam, IntPtr p_lParam)
	 {
	 GC.Collect();
	 GC.WaitForPendingFinalizers();
	 GC.Collect();
	 bool _SendMessage = true;
	 if (GetHook != null) GetHook(p_Code, p_wParam, p_lParam, ref _SendMessage);
	 if (!_SendMessage) return new IntPtr(1);
	 return IntPtr.Zero;
	 }
	 }
	}
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