屏幕截图工具源码

通过实现快捷键呼出截图，进行截图或圈画操作

using System;using System.Collections.Generic;using System.Text;
using System.Runtime.InteropServices;
namespace _SCREEN_CAPTURE {    public class Win32     {        [DllImport("user32.dll")]        public static extern bool SetCursorPos(int x, int y);
        [DllImport("user32.dll")]//获取桌面的句柄         public static extern IntPtr GetDesktopWindow();
        [DllImport("user32.dll")]//在桌面找寻子窗体         public static extern IntPtr ChildWindowFromPointEx(IntPtr pHwnd, LPPOINT pt, uint uFlgs);        public const int CWP_SKIPDISABLED = 0x2;   //忽略不可用窗体         public const int CWP_SKIPINVISIBL = 0x1;   //忽略隐藏的窗体         public const int CWP_All = 0x0;            //一个都不忽略                 [DllImport("user32.dll")]        public static extern int SendMessage(IntPtr hWnd, uint uMsg, IntPtr wParam, IntPtr lParam);        public const uint WM_LBUTTONUP = 0x202;
        [DllImport("user32.dll")]//进行坐标转换 （再窗体内部进行查找）         public static extern bool ScreenToClient(IntPtr hWnd, out LPPOINT lpPoint);
        public struct LPPOINT         {            public int X;            public int Y;        }
        [DllImport("user32.dll")]//获得句柄对象的位置         public static extern bool GetWindowRect(IntPtr hWnd, out LPRECT lpRect);
        public struct LPRECT         {            public int Left;            public int Top;            public int Right;            public int Bottom;        }
        [DllImport("user32.dll")]        public static extern bool GetCursorInfo(out PCURSORINFO pci);
        public struct PCURSORINFO         {            public int cbSize;            public int flag;            public IntPtr hCursor;            public LPPOINT ptScreenPos;        }    }}