主窗体上一个截图按钮一个富文本框。点击截图按钮可以进行截图操作
代码如下：
public partial class MainFrm : Form
{
public MainFrm)
{
InitializeComponent);
}
private void btnCatch_Clickobject sender, EventArgs e)
{
this.Hide);//隐藏当前窗体
System.Threading.Thread.Sleep500);//让线程睡眠一段时间，窗体消失需要一点时间
ScrenFrm CatchForm = new ScrenFrm);
Bitmap CatchBmp = new BitmapScreen.PrimaryScreen.Bounds.Width, Screen.PrimaryScreen.Bounds.Height);//新建一个和屏幕大小相同的图片
Graphics g = Graphics.FromImageCatchBmp);
g.CopyFromScreennew Point0, 0), new Point0, 0), new SizeScreen.AllScreens[0].Bounds.Width, Screen.AllScreens[0].Bounds.Height));//保存全屏图片
CatchForm.BackgroundImage = CatchBmp;//将Catch窗体的背景设为全屏时的图片
if CatchForm.ShowDialog) == DialogResult.OK)
{//如果Catch窗体结束,就将剪贴板中的图片放到信息发送框中
IDataObject iData = Clipboard.GetDataObject);
DataFormats.Format myFormat = DataFormats.GetFormatDataFormats.Bitmap);
if iData.GetDataPresentDataFormats.Bitmap))
{
richTextBox1.PastemyFormat);
Clipboard.Clear);//清除剪贴板中的对象
}
this.Show);//重新显示窗体
}
}
}
弹出窗体代码如下：
public partial class ScrenFrm : Form
{
/// <summary>
/// Required designer variable.
/// </summary>
private System.ComponentModel.IContainer components = null;
/// <summary>
/// Clean up any resources being used.
/// </summary>
/// <param name="disposing">true if managed resources should be disposed; otherwise, false.</param>
protected override void Disposebool disposing)
{
if disposing && components != null))
{
components.Dispose);
}
base.Disposedisposing);
}
#region Windows Form Designer generated code
/// <summary>
/// Required method for Designer support - do not modify
/// the contents of this method with the code editor.
/// </summary>
private void InitializeComponent)
{
this.SuspendLayout);
//
// ScrenFrm
//
this.AutoScaleDimensions = new System.Drawing.SizeF6F, 12F);
this.AutoScaleMode = System.Windows.Forms.AutoScaleMode.Font;
this.ClientSize = new System.Drawing.Size441, 315);
this.DoubleBuffered = true;
this.FormBorderStyle = System.Windows.Forms.FormBorderStyle.None;
this.Name = "ScrenFrm";
this.Text = "截图";
this.WindowState = System.Windows.Forms.FormWindowState.Maximized;
this.Load += new System.EventHandlerthis.截图_Load);
this.MouseClick += new System.Windows.Forms.MouseEventHandlerthis.截图_MouseClick);
this.MouseDoubleClick += new System.Windows.Forms.MouseEventHandlerthis.截图_MouseDoubleClick);
this.MouseDown += new System.Windows.Forms.MouseEventHandlerthis.截图_MouseDown);
this.MouseMove += new System.Windows.Forms.MouseEventHandlerthis.截图_MouseMove);
this.MouseUp += new System.Windows.Forms.MouseEventHandlerthis.截图_MouseUp);
this.ResumeLayoutfalse);
}
#endregion
public ScrenFrm)
{
InitializeComponent);
}
private Point downPiont = Point.Empty;//记录鼠标摁下的点
private bool catchFinished = false;//用来表示截图是否完成
private bool catchStart = false; //截取开始
private Bitmap originBitmap; //用来保存原始图像
private Rectangle catchRect; //用来保存存取的矩形
private void 截图_Loadobject sender, EventArgs e)
{
originBitmap= new Bitmapthis.BackgroundImage);//BackgroundImage为全屏图片，我们另用变量来保存全屏图片
}
private void 截图_MouseClickobject sender, MouseEventArgs e)
{
if e.Button == MouseButtons.Right)
{
this.DialogResult = DialogResult.OK;
this.Close);
}
}
private void 截图_MouseDownobject sender, MouseEventArgs e)
{
if e.Button == MouseButtons.Left)
{
if !catchStart)
{ catchStart = true;
downPiont = new Pointe.X, e.Y);
}
}
}
private void 截图_MouseMoveobject sender, MouseEventArgs e)
{
if catchStart)
{
Bitmap destBitmap =Bitmap)originBitmap.Clone);
Point newPoint = new Pointe.X,e.Y);
Graphics g = Graphics.FromImagedestBitmap);//在刚才新建的图片上新建一个画板
Pen p = new PenColor.Blue, 1);
int width = Math.Abse.X - downPiont.X), height = Math.Abse.Y - downPiont.Y);//获取矩形的长和宽
catchRect = new RectanglenewPoint.X < downPiont.X ? newPoint.X : downPiont.X, newPoint.Y < downPiont.Y ? newPoint.Y : downPiont.Y, width, height);//保存矩形
g.DrawRectanglep, catchRect);//将矩形画在这个画板上
g.Dispose);//释放目前的这个画板
p.Dispose);
Graphics g1 = this.CreateGraphics);//重新新建一个Graphics类
//如果之前那个画板不释放，而直接g=this.CreateGraphics)这样的话无法释放掉第一次创建的g,因为只是把地址转到新的g了．如同string一样
g1 = this.CreateGraphics);//在整个全屏窗体上新建画板
g1.DrawImagedestBitmap, new Point0, 0));//将刚才所画的图片画到这个窗体上
//这个也可以属于二次缓冲技术，如果直接将矩形画在窗体上，会造成图片抖动并且会有无数个矩形．
g1.Dispose);
destBitmap.Dispose);//要及时释放，不然内存将会被大量消耗
}
}
private void 截图_MouseUpobject sender, MouseEventArgs e)
{
if e.Button == MouseButtons.Left)
{
if catchStart)
{
catchStart = false;
catchFinished = true;
}
}
}
private void 截图_MouseDoubleClickobject sender, MouseEventArgs e)
{
if e.Button == MouseButtons.Left && catchFinished)
{
if catchRect.Containsnew Pointe.X, e.Y)))
{
Bitmap CatchedBmp = new BitmapcatchRect.Width, catchRect.Height);//新建一个于矩形等大的空白图片
Graphics g = Graphics.FromImageCatchedBmp);
g.DrawImageoriginBitmap, new Rectangle0, 0, catchRect.Width, catchRect.Height), catchRect, GraphicsUnit.Pixel);
//把orginBmp中的指定部分按照指定大小画在画板上
Clipboard.SetImageCatchedBmp);//将图片保存到剪贴板
g.Dispose);
catchFinished = false;
CatchedBmp.Dispose);
this.DialogResult = DialogResult.OK;
this.Close);
}
}
}
}