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作者:朱先忠编译 来源:天极开发 2007年11月4日
关键字:
void Session_Start(object sender, EventArgs e){ Bitmap bmp = new Bitmap(200, 200); using (Graphics g = Graphics.FromImage(bmp)) { g.FillRectangle(new SolidBrush(Color.White),new Rectangle(0, 0, bmp.Width, bmp.Height)); g.Flush(); } Session["Image"] = bmp; } |
Bitmap bmp = (Bitmap)Session["Image"]; bmp.Dispose(); |
ScribbleImage.ashx |
public class ScribbleImage : IHttpHandler, System.Web.SessionState.IRequiresSessionState |
public void ProcessRequest (HttpContext context){ context.Response.ContentType = "image/png"; context.Response.Cache.SetNoStore(); context.Response.Cache.SetCacheability(HttpCacheability.NoCache); context.Response.Cache.SetExpires(DateTime.Now); context.Response.Cache.SetValidUntilExpires(false); System.Drawing.Bitmap bmp = (System.Drawing.Bitmap)context.Session["Image"]; lock(bmp) { using (MemoryStream ms = new MemoryStream()) { bmp.Save(ms, ImageFormat.Png); ms.Flush(); context.Response.BinaryWrite(ms.GetBuffer()); } } } } |
public class Point{ public int X; public int Y; }; |
[WebMethod(EnableSession = true)] public void Draw(Point[] points){ Image scribbleImage = (Image)Session["Image"]; lock(scribbleImage) { using (Graphics g = Graphics.FromImage(scribbleImage)) using(Pen p = new Pen(Color.Black, 2)) { if (points.Length > 1) { int startX = points[0].X; int startY = points[0].Y; for (long i = 1; i < points.Length; i++) { g.DrawLine(p, startX, startY, points[i].X, points[i].Y); startX = points[i].X; startY = points[i].Y; } } } } } |
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