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使用C#实现对任意区域任意大小的截图

作者:lingxiao16888

这篇文章主要为大家详细介绍了如何使用C#实现简单的截图功能,可以对任意区域任意大小的截图,感兴趣的小伙伴可以跟随小编一起学习一下

1.目的

实现类似系统截图工具那样对屏幕任何区域自定义大小的截图。

2.效果展示

点击截图

选择需要截图的区域:

区域选择完成后,单击右键完成截图:

在合适的载体上粘贴截图:

3.代码

 public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
        }
 
        private void button1_Click(object sender, EventArgs e)
        {
            this.WindowState = FormWindowState.Minimized;
            //获取屏幕截屏
            Bitmap bcgImg = new Bitmap(Screen.PrimaryScreen.Bounds.Width, Screen.PrimaryScreen.Bounds.Height);
            using (Graphics g= Graphics.FromImage(bcgImg))
            {
                g.CopyFromScreen(new Point(0, 0), new Point(0, 0), new Size(bcgImg.Width, bcgImg.Height));
 
            }
            //将图片传给截图窗口
            CaptureFrm frm = new CaptureFrm(bcgImg);
            frm.TopMost = true;
           if( frm.ShowDialog()== DialogResult.OK)
            {
                MessageBox.Show("截图已保存至剪贴板,请选择合适的载体进行粘贴!", "提示", MessageBoxButtons.OK, MessageBoxIcon.Information);
            }
            else
            {
                MessageBox.Show("取消截图","提示", MessageBoxButtons.OK, MessageBoxIcon.Warning);
            }
            this.WindowState = FormWindowState.Normal;
        }
    }
public partial class CaptureFrm : Form
    {
        Bitmap bcgImg;
        bool drawingFlag=false;
        Point startPoint;
        Point endPoint;
        Graphics main_g;
        bool isCapture=false;
        public CaptureFrm(Bitmap img)
        {
            InitializeComponent();
            bcgImg = img;
        }
 
        private void CaptureFrm_Load(object sender, EventArgs e)
        {
            //背景
            this.BackgroundImage = bcgImg;
            this.BackgroundImageLayout = ImageLayout.Stretch;
 
        }
 
        private void CaptureFrm_KeyDown(object sender, KeyEventArgs e)
        {
            //如果按下ESC键则退出
            if (e.KeyCode == Keys.Escape)
            {
                //  this.Close();
                DialogResult = DialogResult.Cancel;
            }
        }
 
        private void CaptureFrm_MouseDown(object sender, MouseEventArgs e)
        {
          if(e.Button== MouseButtons.Left)
            {
                drawingFlag = true;
                startPoint = e.Location;
                main_g = this.CreateGraphics();
            }
          if(e.Button== MouseButtons.Right)
            {
                if (isCapture)
                {
                    Bitmap map = new Bitmap(width, height);
                    Bitmap source = new Bitmap(bcgImg, new Size(this.Width, this.Height));
                    using (Graphics g = Graphics.FromImage(map))
                    {
                        g.DrawImage(source, new Rectangle(0, 0, map.Width, map.Height), new Rectangle(recX, recY, width, height), GraphicsUnit.Pixel);
                    }
                    Clipboard.SetImage(map);
                    main_g.Dispose();
                    DialogResult = DialogResult.OK;
                    isCapture = false;
                }
            }
            
            
        }
 
        private void CaptureFrm_MouseUp(object sender, MouseEventArgs e)
        {
            if(e.Button== MouseButtons.Left)
            {
                //进行最终边界确认
                endPoint = e.Location;
                drawingFlag = false;
                isCapture = true;
            }
           
        }
        int recX, recY, width, height;
        private void CaptureFrm_MouseMove(object sender, MouseEventArgs e)
        {
            if (!drawingFlag ||main_g==null) return;
            
            width = Math.Abs(startPoint.X - e.X);
            height = Math.Abs(startPoint.Y - e.Y);
            if (startPoint.X < e.X)
            {
                recX = startPoint.X;
            }
            else
            {
                recX = startPoint.X-width;
            }
            if (startPoint.Y < e.Y)
            {
                recY = startPoint.Y;
            }
            else
            {
                recY = startPoint.Y-height;
            }
            CaptureFrm_Paint(null, null);
            Pen pen = new Pen(Color.Green, 2);
            pen.DashPattern = new float[] { 1, 2 };
            pen.DashStyle = System.Drawing.Drawing2D.DashStyle.Dash;
            main_g.DrawRectangle(pen, recX, recY, width, height);
            string ss = $"X:{recX},Y:{recY}\n width:{width},height:{height}";
            main_g.DrawString(ss, new Font("宋体", 12,FontStyle.Bold), Brushes.Red, new Point(10, 10));
        }
 
        private void CaptureFrm_Paint(object sender, PaintEventArgs e)
        {
            if (main_g == null) return;
          //  main_g.Clear(Color.WhiteSmoke);
            main_g.DrawImage(bcgImg, new Rectangle(0, 0, this.Width, this.Height), new Rectangle(0, 0, bcgImg.Width, bcgImg.Height), GraphicsUnit.Pixel);
           
        }
 
        private void CaptureFrm_DoubleClick(object sender, EventArgs e)
        {
           
        }
    }

到此这篇关于使用C#实现对任意区域任意大小的截图的文章就介绍到这了,更多相关C#截图内容请搜索脚本之家以前的文章或继续浏览下面的相关文章希望大家以后多多支持脚本之家!

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