C#实现截图工具小项目

 using System; using System.Runtime.InteropServices; using System.Windows.Forms; namespace test { /// 
 /// 热键类 /// 
 public class HotKey { /// 
 /// 如果函数执行成功，返回值不为0，如果执行失败，返回值为0 /// 
 ///  [DllImport("user32.dll", SetLastError = true)] public static extern bool RegisterHotKey( IntPtr hWnd,           // 窗口的句柄, 当热键按下时，会产生WM_HOTKEY信息，该信息该会发送该窗口句柄 int id,                      // 定义热键ID,属于唯一标识热键的作用 uint fsModifiers,            // 热键只有在按下Alt、 Ctrl、Shift、Windows等键时才会生效，即才会产生WM_HOTKEY信息 Keys vk                   // 虚拟键,即按了Alt+Ctrl+ X ，X就是代表虚拟键 ); [DllImport("user32.dll", SetLastError = true)] public static extern bool UnregisterHotKey( IntPtr hWnd,                   // 窗口句柄 int id                         // 要取消热键的ID ); } }

 using System; using System.Drawing; using System.Drawing.Imaging; using System.Threading; using System.Timers; using System.Windows.Forms; namespace test { public partial class Form1 : Form { [Flags] public enum KeyModifiers { //定义热键值字符串(热键值是系统规定的，不能改变) None = 0, Alt = 1, Ctrl = 2, Shift = 4, WindowsKey = 8 } public Form1() { InitializeComponent(); } //窗体加载时-注册快捷键 private void Form1_Load(object sender, EventArgs e) { uint ctrlHotKey = (uint)(KeyModifiers.Alt | KeyModifiers.Ctrl); // 注册热键为Alt+Ctrl+A, "100"为唯一标识热键 HotKey.RegisterHotKey(Handle,100,ctrlHotKey,Keys.A); } //截图按钮 private void button1_Click(object sender, EventArgs e) { if (this.WindowState != FormWindowState.Minimized) { this.WindowState = FormWindowState.Minimized; Thread.Sleep(200); } int swidth = Screen.PrimaryScreen.Bounds.Width; int sheight = Screen.PrimaryScreen.Bounds.Height; Bitmap btm = new Bitmap(swidth,sheight); //空图与屏幕同大小 Graphics g = Graphics.FromImage(btm); //空图的画板 g.CopyFromScreen(new Point(0,0),new Point(0,0),new Size(swidth,sheight)); //将屏幕内容复制到空图 Cutter cutter = new Cutter(btm); //传送截图 cutter.FormBorderStyle = FormBorderStyle.None; //截图全屏，无边框 cutter.BackgroundImage = btm; //新的窗体截图做背景 cutter.Show(); } private void tiaoZ(object sender, ElapsedEventArgs e) { } //窗体关闭-取消热键 private void Form1_FormClosing(object sender, FormClosingEventArgs e) { HotKey.UnregisterHotKey(Handle,100); } //快捷键按下执行的事件 private void GlobalKeyProcess() { this.WindowState = FormWindowState.Minimized; Thread.Sleep(200); button1.PerformClick(); } //重写。监视系统消息，调用对应方法 protected override void WndProc(ref Message m) { const int WM_HOTKEY = 0x0312; //如果m.Msg的值为0x0312（我也不知道为什么是0x0312）那么表示用户按下了热键 switch (m.Msg) { case WM_HOTKEY: if (m.WParam.ToString().Equals("100")) { GlobalKeyProcess(); } //todo  其它热键 break; } // 将系统消息传递自父类的WndProc base.WndProc(ref m); } } }

 using System; using System.Collections.Generic; using System.ComponentModel; using System.Data; using System.Drawing; using System.Linq; using System.Text; using System.Threading.Tasks; using System.Windows.Forms; namespace test { public partial class Cutter : Form { Bitmap screenBtmp = null; //电脑屏幕的截图 public Cutter(Bitmap btm) { InitializeComponent(); screenBtmp = btm; } //鼠标右键退出 private void Cutter_MouseClick(object sender, MouseEventArgs e) { if (e.Button == MouseButtons.Right) { this.DialogResult = DialogResult.OK; this.Close(); } } bool CatchStart = false; //自由截图开始 Point downPoint; //初始点 //鼠标左键按下-开始自由截图 private void Cutter_MouseDown(object sender, MouseEventArgs e) { if (e.Button == MouseButtons.Left) { if (!CatchStart) { CatchStart = true; downPoint = new Point(e.X,e.Y); //初始点 } } } Rectangle catchRec;//存放截取范围 //鼠标移动-绘制自由截图路径 private void Cutter_MouseMove(object sender, MouseEventArgs e) { //路径绘制，核心 if (CatchStart) { // //二次缓冲 //不是直接在控件的背景画板上进行绘制鼠标移动路径，那样会造成绘制很多路径，因为前面绘制的路径还在 //而是在内存中每移动一次鼠标就创建一张和屏幕截图一样的新BImtap,在这个Bitmap中绘制鼠标移动路径 //然后在窗体背景画板上，绘制这个新的Bitmap,这样就不会造成绘制很多路径，因为每次都绘制了全新的Bitmao //但是这样做的话，因为鼠标移动的次数是大量的，所以在内存中会创建大量的Bitmap会造成内存消耗严重，所以每次移动绘制完后， //需要释放Dispose() 画板，画笔，Bitmap资源。 // Bitmap copyBtmp = (Bitmap)screenBtmp.Clone(); //创建新的,在其上绘制路径 //左上角 Point firstP = new Point(downPoint.X,downPoint.Y); //新建画板，画笔 Graphics g = Graphics.FromImage(copyBtmp); Pen p = new Pen(Color.Red,1); //计算路径范围 int width = Math.Abs(e.X - downPoint.X); int height = Math.Abs(e.Y - downPoint.Y); if (e.X 以上就是C#实现截图工具小项目的详细内容，更多请关注0133技术站其它相关文章！