C# 实现鼠标选择矩形截图

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;
        }

 

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

 

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 /// [e-mail] /// 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 /// [e-mail] /// </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; } }}

 

在其他项目里引用这个项目就好了