Winform写一个截图工具，怎么编写一个截图功能
截图主要代码
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 OCR
{
public partial class ScreenBody : Form
{
public static Image myImage;
private Graphics MainPainter; //主画面
private Pen pen; //画笔
private bool isDowned; //判断鼠标是否按下
private bool RectReady; //矩形是否绘制完成
private Image baseImage; //基本图形(原来的画面)
private Rectangle Rect; //就是要保存的矩形
private Point downPoint; //鼠标按下的点
int tmpx;
int tmpy;
public ScreenBody()
{
InitializeComponent();
}
private void ScreenBody_Load(object sender, EventArgs e)
{
try
{
this.WindowState = FormWindowState.Maximized;
MainPainter = this.CreateGraphics();
pen = new Pen(Brushes.Blue);
isDowned = false;
baseImage = this.BackgroundImage;
Rect = new Rectangle();
RectReady = false;
}
catch (Exception ex)
{
log4netHelper.Error("---报错方法--ScreenBody_Load");
log4netHelper.Error(ex.Message);
log4netHelper.Error(ex.StackTrace);
log4netHelper.Error("---end---");
}
}
private void ScreenBody_MouseDown(object sender, MouseEventArgs e)
{
try
{
if (e.Button == MouseButtons.Left)
{
isDowned = true;
if (RectReady == false)
{
Rect.X = e.X;
Rect.Y = e.Y;
downPoint = new Point(e.X, e.Y);
}
if (RectReady == true)
{
tmpx = e.X;
tmpy = e.Y;
}
}
if (e.Button == MouseButtons.Right)
{
this.Close();
return;
}
}
catch (Exception ex)
{
log4netHelper.Error("---报错方法--ScreenBody_MouseDown");
log4netHelper.Error(ex.Message);
log4netHelper.Error(ex.StackTrace);
log4netHelper.Error("---end---");
}
}
private void ScreenBody_MouseUp(object sender, MouseEventArgs e)
{
if (e.Button == MouseButtons.Left)
{
isDowned = false;
RectReady = true;
}
}
private void ScreenBody_MouseMove(object sender, MouseEventArgs e)
{
try
{
if (RectReady == false)
{
if (isDowned == true)
{
Image New = DrawScreen((Image)baseImage.Clone(), e.X, e.Y);
MainPainter.DrawImage(New, 0, 0);
New.Dispose();
}
}
if (RectReady == true)
{
if (Rect.Contains(e.X, e.Y))
{
this.Cursor = Cursors.Hand;
if (isDowned == true)
{
//和上一次的位置比较获取偏移量
Rect.X = Rect.X + e.X - tmpx;
Rect.Y = Rect.Y + e.Y - tmpy;
//记录现在的位置
tmpx = e.X;
tmpy = e.Y;
MoveRect((Image)baseImage.Clone(), Rect);
}
}
else
{
this.Cursor = Cursors.Arrow;
}
}
}
catch (Exception ex)
{
log4netHelper.Error("---报错方法--ScreenBody_MouseMove");
log4netHelper.Error(ex.Message);
log4netHelper.Error(ex.StackTrace);
log4netHelper.Error("---end---");
}
}
//画屏幕
private Image DrawScreen(Image back, int Mouse_x, int Mouse_y)
{
try
{
Graphics Painter = Graphics.FromImage(back);
DrawRect(Painter, Mouse_x, Mouse_y);
return back;
}
catch (Exception ex)
{
log4netHelper.Error("---报错方法--DrawScreen");
log4netHelper.Error(ex.Message);
log4netHelper.Error(ex.StackTrace);
log4netHelper.Error("---end---");
return null;
}
}
//画矩形
private void DrawRect(Graphics Painter, int Mouse_x, int Mouse_y)
{
int width = 0;
int heigth = 0;
try
{
if (Mouse_y < Rect.Y)
{
Rect.Y = Mouse_y;
heigth = downPoint.Y - Mouse_y;
}
else
{
heigth = Mouse_y - downPoint.Y;
}
if (Mouse_x < Rect.X)
{
Rect.X = Mouse_x;
width = downPoint.X - Mouse_x;
}
else
{
width = Mouse_x - downPoint.X;
}
}
catch (Exception ex)
{
log4netHelper.Error("---报错方法--DrawRect");
log4netHelper.Error(ex.Message);
log4netHelper.Error(ex.StackTrace);
log4netHelper.Error("---end---");
}
finally
{
Rect.Size = new Size(width, heigth);
Painter.DrawRectangle(pen, Rect);
}
}
//移动矩形
private void MoveRect(Image image, Rectangle Rect)
{
try
{
Graphics Painter = Graphics.FromImage(image);
Painter.DrawRectangle(pen, Rect.X, Rect.Y, Rect.Width, Rect.Height);
MainPainter.DrawImage(image, 0, 0);
image.Dispose();
}
catch (Exception ex)
{
log4netHelper.Error("---报错方法--MoveRect");
log4netHelper.Error(ex.Message);
log4netHelper.Error(ex.StackTrace);
log4netHelper.Error("---end---");
}
}
private void ScreenBody_MouseDoubleClick(object sender, MouseEventArgs e)
{
try
{
Image memory = new Bitmap(Rect.Width, Rect.Height);
Graphics g = Graphics.FromImage(memory);
g.CopyFromScreen(Rect.X + 1, Rect.Y + 1, 0, 0, new Size(Rect.Size.Width - 2, Rect.Size.Height - 2));
myImage = memory;
this.Close();
this.Dispose();
}
catch (Exception ex)
{
log4netHelper.Error("---报错方法--ScreenBody_MouseDoubleClick");
log4netHelper.Error(ex.Message);
log4netHelper.Error(ex.StackTrace);
log4netHelper.Error("---end---");
}
}
}
}
HotKey，热键注册
using System;
using System.Runtime.InteropServices;
using System.Windows.Forms;
namespace OCR
{
public class HotKey
{
//如果函数执行成功，返回值不为0。
//如果函数执行失败，返回值为0。要得到扩展错误信息，调用GetLastError。
[DllImport("user32.dll", SetLastError = true)]
public static extern bool RegisterHotKey(
IntPtr hWnd, //要定义热键的窗口的句柄
int id, //定义热键ID（不能与其它ID重复）
KeyModifiers fsModifiers, //标识热键是否在按Alt、Ctrl、Shift、Windows等键时才会生效
Keys vk //定义热键的内容
);
[DllImport("user32.dll", SetLastError = true)]
public static extern bool UnregisterHotKey(
IntPtr hWnd, //要取消热键的窗口的句柄
int id //要取消热键的ID
);
//定义了辅助键的名称（将数字转变为字符以便于记忆，也可去除此枚举而直接使用数值）
[Flags()]
public enum KeyModifiers
{
None = 0,
Alt = 1,
Ctrl = 2,
Shift = 4,
WindowsKey = 8
}
}
}