C#实现屏幕截图.doc

C#实现屏幕截图运行效果：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.Windows.Forms;using System.Drawing.Drawing2D;namespace Test.UIFrm public class Form2 : Form #region 窗体设计器代码 private System.ComponentModel.IContainer components = null; protected override void Dispose(bool disposing) if (disposing) if (components != null) components.Dispose(); base.Dispose(disposing); private void InitializeComponent() this.tiptext = new System.Windows.Forms.Label(); this.btnOk = new System.Windows.Forms.Button(); this.btnSave = new System.Windows.Forms.Button(); this.btnCancel = new System.Windows.Forms.Button(); this.SuspendLayout(); / / tiptext / this.tiptext.BackColor = System.Drawing.Color.DimGray; this.tiptext.ForeColor = System.Drawing.Color.Transparent; this.tiptext.Location = new System.Drawing.Point(86, 9); this.tiptext.Name = tiptext; this.tiptext.Size = new System.Drawing.Size(85, 13); this.tiptext.TabIndex = 0; this.tiptext.Text = 1200*1200; this.tiptext.TextAlign = System.Drawing.ContentAlignment.MiddleCenter; this.tiptext.Visible = false; / / btnOk / this.btnOk.Location = new System.Drawing.Point(0, 0); this.btnOk.Name = btnOk; this.btnOk.Size = new System.Drawing.Size(40, 20); this.btnOk.TabIndex = 22; this.btnOk.Text = 完成; this.btnOk.Visible = false; this.btnOk.Click += new System.EventHandler(this.btnOk_Click); / / btnSave / this.btnSave.Location = new System.Drawing.Point(0, 0); this.btnSave.Name = btnSave; this.btnSave.Size = new System.Drawing.Size(40, 20); this.btnSave.TabIndex = 1; this.btnSave.Text = 保存; this.btnSave.Visible = false; this.btnSave.Click += new System.EventHandler(this.btnSave_Click); / / btnCancel / this.btnCancel.Location = new System.Drawing.Point(0, 0); this.btnCancel.Name = btnCancel; this.btnCancel.Size = new System.Drawing.Size(40, 20); this.btnCancel.TabIndex = 3; this.btnCancel.Text = 取消; this.btnCancel.Visible = false; this.btnCancel.Click += new EventHandler(btnCancel_Click); / / Form2 / this.AutoScaleBaseSize = new System.Drawing.Size(6, 14); this.ClientSize = new System.Drawing.Size(456, 320); this.Controls.Add(this.btnCancel); this.Controls.Add(this.tiptext); this.Controls.Add(this.btnOk); this.Controls.Add(this.btnSave); this.FormBorderStyle = System.Windows.Forms.FormBorderStyle.None; this.Name = Form2; this.ShowInTaskbar = false; this.StartPosition = System.Windows.Forms.FormStartPosition.WindowsDefaultBounds; this.Text = 鼠标截屏; this.TopMost = true; this.WindowState = System.Windows.Forms.FormWindowState.Maximized; this.DoubleClick += new System.EventHandler(this.MouseCaptureForm_DoubleClick); this.KeyDown += new System.Windows.Forms.KeyEventHandler(this.MouseCaptureForm_KeyDown); this.ResumeLayout(false); #endregion private Point pot; private Rectangle area = Rectangle.Empty; private Image img; private int index = -1; private System.Windows.Forms.Label tiptext; public Form2() this.Bounds = System.Windows.Forms.Screen.PrimaryScreen.Bounds; this.BackgroundImage = this.GetScreen(); InitializeComponent(); this.DoubleBuffered = true; #region 操作栏 private System.Windows.Forms.Button btnOk; private System.Windows.Forms.Button btnSave; private void btnSave_Click(object sender, EventArgs e) this.SaveToFile(); private void btnOk_Click(object sender, EventArgs e) this.SaveToClipBoard(); private void btnCancel_Click(object sender, EventArgs e) this.Close(); private void ToolBars(bool show) if (show) btnCancel.Location = new Point(this.area.X + this.area.Width - btnCancel.Width, this.area.Y + this.area.Height + 10); btnOk.Location = new Point(this.area.X + this.area.Width - btnOk.Width - btnCancel.Width, this.area.Y + this.area.Height + 10); btnSave.Location = new Point(this.area.X + this.area.Width - btnOk.Width - btnSave.Width - btnCancel.Width, this.area.Y + this.area.Height + 10); btnOk.Visible = show; btnSave.Visible = show; btnCancel.Visible = show; #endregion #region 获取屏幕 / 引用API System.Runtime.InteropServices.DllImportAttribute(gdi32.dll) public static extern bool BitBlt( IntPtr hdcDest, /目标设备的句柄 int nXDest, / 目标对象的左上角的X坐标 int nYDest, / 目标对象的左上角的X坐标 int nWidth, / 目标对象的矩形的宽度 int nHeight, / 目标对象的矩形的长度 IntPtr hdcSrc, / 源设备的句柄 int nXSrc, / 源对象的左上角的X坐标 int nYSrc, / 源对象的左上角的X坐标 System.Int32 dwRop / 光栅的操作值 ); private Bitmap GetScreen() /建立屏幕Graphics Graphics grpScreen = Graphics.FromHwnd(IntPtr.Zero); /根据屏幕大小建立位图 Bitmap bitmap = new Bitmap(Screen.PrimaryScreen.Bounds.Width, Screen.PrimaryScreen.Bounds.Height, grpScreen); /建立位图相关Graphics Graphics grpBitmap = Graphics.FromImage(bitmap); /建立屏幕上下文 IntPtr hdcScreen = grpScreen.GetHdc(); /建立位图上下文 IntPtr hdcBitmap = grpBitmap.GetHdc(); /将屏幕捕获保存在图位中 BitBlt(hdcBitmap, 0, 0, bitmap.Width, bitmap.Height, hdcScreen, 0, 0, 0x00CC0020); /关闭位图句柄 grpBitmap.ReleaseHdc(hdcBitmap); /关闭屏幕句柄 grpScreen.ReleaseHdc(hdcScreen); /释放位图对像 grpBitmap.Dispose(); /释放屏幕对像 grpScreen.Dispose(); /返回捕获位图 return bitmap; #endregion #region 绘制窗口 / / 设置鼠标方案 / private void SetCursor() Cursor cr = Cursors.Default; if (index = 1 | index = 5) cr = Cursors.SizeNWSE; else if (index = 2 | index = 6) cr = Cursors.SizeNS; else if (index = 3 | index = 7) cr = Cursors.SizeNESW; else if (index = 4 | index = 8) cr = Cursors.SizeWE; else if (index = 0) cr = Cursors.SizeAll; Cursor.Current = cr; protected override void OnPaint(PaintEventArgs e) SuspendLayout(); base.OnPaint(e); Rectangle tmp = this.GetSelectedRectangle(); e.Graphics.DrawRectangle(new Pen(Color.Green), tmp); this.tiptext.Location = new Point(tmp.X, tmp.Y - this.tiptext.Height - 4); /mask GraphicsPath path = new GraphicsPath(); int x = tmp.X, y = tmp.Y, w = tmp.Width, h = tmp.Height; int sw = System.Windows.Forms.Screen.PrimaryScreen.Bounds.Width, sh = System.Windows.Forms.Screen.PrimaryScreen.Bounds.Height; path.AddRectangle(new Rectangle(0, 0, sw, y); path.AddRectangle(new Rectangle(0, y, x, h); path.AddRectangle(new Rectangle(x + w, y, sw - x - w, h); path.AddRectangle(new Rectangle(0, y + h, sw, sh - y - h); Region region = new Region(path); SolidBrush brush = new SolidBrush(Color.FromArgb(100, Color.Black); e.Graphics.FillRegion(brush, region); if (this.area != Rectangle.Empty) for (int i = 1; i 9; i+) e.Graphics.FillRectangle(new SolidBrush(Color.Green), this.GetHandleRect(i); ResumeLayout(true); / / 获取选择的矩形区域 / / private Rectangle GetSelectedRectangle() int x1 = this.area.X, y1 = this.area.Y , x2 = this.area.X + this.area.Width, y2 = this.area.Y + this.area.Height; Rectangle tmp = new Rectangle(x1, y1, Math.Abs(this.area.Width), Math.Abs(this.area.Height); if (x1 x2) tmp.X = x2; if (y1 y2) tmp.Y = y2; return tmp; private Rectangle GetHandleRect(int index) int x, y, xCenter, yCenter; xCenter = area.X + area.Width / 2; yCenter = area.Y + area.Height / 2; x = area.X; y = area.Y; switch (index) case 1: x = area.X; y = area.Y; break; case 2: x = xCenter; y = area.Y; break; case 3: x = area.Right; y = area.Y; break; case 4: x = area.Right; y = yCenter; break; case 5: x = area.Right; y = area.Bottom; break; case 6: x = xCenter; y = area.Bottom; break; case 7: x = area.X; y = area.Bottom; break; case 8: x = area.X; y = yCenter; break; Point point = new Point(x, y); return new Rectangle(point.X - 3, point.Y - 3, 6, 6); private int GetSelectedHandle(Point p) int index = -1; for (int i = 1; i 9; i+) if (GetHandleRect(i).Contains(p) index = i; break; if (this.area.Contains(p) index = 0; return index; #endregion #region 鼠标事件 protected override void OnMouseDown(MouseEventArgs e) base.OnMouseDown(e); if (this.area = Rectangle.Empty & e.Button = MouseButtons.Left) this.area.Location = new Point(e.X, e.Y); this.pot = new Point(e.X, e.Y); this.index = this.GetSelectedHandle(new Point(e.X, e.Y); this.ToolBars(false); this.SetCursor(); protected override void OnMouseUp(MouseEventArgs e) base.OnMouseUp(e); int left = area.Left; int top = area.Top; int right = area.Right; int bottom = area.Bottom; area.X = Math.Min(left, right); area.Y = Math.Min(top, bottom); area.Width = Math.Abs(left - right); area.Height = Math.Abs(top - bottom); this.ToolBars(true); if (e.Button = MouseButtons.Right) if (this.area = Rectangle.Empty) this.Close(); else this.area = Rectangle.Empty; this.ToolBars(false); this.Invalidate(); this.index = this.GetSelectedHandle(new Point(e.X, e.Y); this.SetCursor(); protected override void OnMouseMove(MouseEventArgs e) base.OnMouseMove(e); if (this.Capture) this.MoveHandleTo(new Point(e.X, e.Y); this.Invalidate(); else this.index = this.GetSelectedHandle(new Point(e.X, e.Y); this.SetCursor(); private void MoveHandleTo(Point point) int left = area.Left; int top = area.Top; int right = area.Right; int bottom = area.Bottom; switch (index) case 0: area.X += point.X - this.pot.X; area.Y += point.Y - pot.Y; this.pot = point; return; case 1: left = point.X; top = point.Y; break; case 2: top = point.Y; break; case 3: right = point.X; top = point.Y; break; case 4: right = point.X; break; case 5: right = point.X; bottom = point.Y; break; case 6: bottom = point.Y; break; case 7: left = point.X; bottom = point.Y; break; case 8: left = point.X; break; this.pot = point; area.X = left; area.Y = top; area.Width = right - left; area.Height = bottom - top; this.tiptext.Text = string.Format(01, Math.Abs(this.area.Width), Math.Abs(this.area.Height); #endregion private void MouseCaptureForm_DoubleClick(object sender, System.EventArgs e) this.SaveToClipBoard(); private void MouseCaptureForm_KeyDown(object sender, System.Windows.Forms.KeyEventArgs e) if (e.KeyData = Keys.Escape & System.Windows.Forms.Button.MouseButtons = MouseButtons.Left) this.area = Rectangle.Empty; this.ToolBars(false); this.Invalidate(); else if (e.KeyData = Keys.Escape) this.Close(); #region 保存图片 private void CaptureImage() if (this.area = Rectangle.Empty) return; /修正截取图片过界提示内存不足BUG int left = area.Left; int right = area.Right; int top = area.Top; int bottom = area.Bottom; if (left Screen.PrimaryScreen.Bounds.Right) right = Screen.PrimaryScreen.Bounds.Right; if (top Screen.PrimaryScreen.Bounds.Bottom) bottom = Screen.PrimaryScreen.Bounds.Bottom; area.X = left; area.Y = top; area.Width = right - left; area.Height = bottom - top; /截取选择区域图片 Bitmap bm = new Bitmap(this.BackgroundImage); this.img = bm.Clone(this.area, System.Drawing.Imaging.PixelFormat.Format32bppArgb); this.Close(); private void SaveToClipBoard() this.CaptureImage(); Clipboard.SetDataObject(this.img, true); private void SaveToFile() SaveFileDi