解决C#全屏幕截图的实现方法

2023-03-10 12:16| 来源: 网络整理| 查看: 265

Codepublic partial class FullScreenForm : Form { private Rectangle rectSelected = Rectangle.Empty; private bool isClipping = false; private Bitmap screen; private Bitmap coverLayer = null; private Color coverColor; private Brush rectBrush = null; private Bitmap resultBmp = null; public FullScreenForm(Bitmap screen) { InitializeComponent(); int width = Screen.PrimaryScreen.Bounds.Width; int height = Screen.PrimaryScreen.Bounds.Height; coverLayer = new Bitmap(width, height); coverColor = Color.FromArgb(50, 200, 0, 0); rectBrush = new SolidBrush(coverColor); using (Graphics g = Graphics.FromImage(coverLayer)) { g.Clear(coverColor); } this.Bounds = new Rectangle(0, 0, width, height); this.screen = screen; this.DoubleBuffered = true; } protected override void OnMouseDown(MouseEventArgs e) { if (e.Button == MouseButtons.Left) { isClipping = true; rectSelected.Location = e.Location; } else if (e.Button == MouseButtons.Right) { this.DialogResult = DialogResult.OK; } } protected override void OnMouseMove(MouseEventArgs e) { if (e.Button == MouseButtons.Left && isClipping) { rectSelected.Width = e.X - rectSelected.X; rectSelected.Height = e.Y - rectSelected.Y;

this.Invalidate(); } } protected override void OnMouseUp(MouseEventArgs e) { if (e.Button == MouseButtons.Left && isClipping) { rectSelected.Width = e.X - rectSelected.X; rectSelected.Height = e.Y - rectSelected.Y; this.Invalidate(); resultBmp = new Bitmap(rectSelected.Width, rectSelected.Height); using (Graphics g = Graphics.FromImage(resultBmp)) { g.DrawImage(screen,new Rectangle(0, 0, rectSelected.Width, rectSelected.Height), rectSelected, GraphicsUnit.Pixel); } this.DialogResult = DialogResult.OK; } } protected override void OnPaint(PaintEventArgs e) { Graphics g = e.Graphics; g.DrawImage(screen, 0, 0); g.DrawImage(coverLayer, 0, 0); PaintRectangle(); } protected override void OnPaintBackground(PaintEventArgs e) {

} protected override void OnKeyDown(KeyEventArgs e) { if (e.KeyCode == Keys.Escape) { this.DialogResult = DialogResult.Cancel; } } private void PaintRectangle() { using (Graphics g = Graphics.FromImage(coverLayer)) { g.Clear(coverColor); GraphicsPath path = new GraphicsPath(); path.AddRectangle(this.Bounds); path.AddRectangle(rectSelected); g.FillPath(rectBrush, path); g.DrawRectangle(Pens.Blue, rectSelected); } } public Bitmap ResultBitmap { get { return resultBmp; } }}

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