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上传时间: 2011-11-29
详细说明： web页面验证码代码 private void CreateCheckCodeImage(string[] checkCode) { if (checkCode == null || checkCode.Length <= 0) return; System.Drawing.Bitmap image = new System.Drawing.Bitmap((int)Math.Ceiling((checkCode.Length * 32.5)), 30); System.Drawing.Graphics g = Graphics.FromImage(image); try { Random random = new Random(); //清空图片背景色 g.Clear(Color.White); //画图片的背景噪音线 for (int i = 0; i < 20; i++) { int x1 = random.Next(image.Width); int x2 = random.Next(image.Width); int y1 = random.Next(image.Height); int y2 = random.Next(image.Height); g.DrawLine(new Pen(Color.Silver), x1, y1, x2, y2); } //定义颜色 Color[] c = { Color.Black, Color.Red, Color.DarkBlue, Color.Green, Color.Orange, Color.Brown, Color.DarkCyan, Color.Purple }; //定义字体 string[] f = { "Verdana", "Microsoft Sans Serif", "Comic Sans MS", "Arial", "宋体" }; for (int k = 0; k <= checkCode.Length - 1; k++) { int cindex = random.Next(7); int findex = random.Next(5); Font drawFont = new Font(f[findex], 15, (System.Drawing.FontStyle.Bold)); SolidBrush drawBrush = new SolidBrush(c[cindex]); float x = 5.0F; float y = 0.0F; float width = 20.0F; float height = 25.0F; int sjx = random.Next(10); int sjy = random.Next(image.Height - (int)height); RectangleF drawRect = new RectangleF(x + sjx + (k * 25), y + sjy, width, height); StringFormat drawFormat = new StringFormat(); drawFormat.Alignment = StringAlignment.Center; g.DrawString(checkCode[k], drawFont, drawBrush, drawRect, drawFormat); } //画图片的前景噪音点 for (int i = 0; i < 100; i++) { int x = random.Next(image.Width); int y = random.Next(image.Height); image.SetPixel(x, y, Color.FromArgb(random.Next())); } //画图片的边框线 g.DrawRectangle(new Pen(Color.Silver), 0, 0, image.Width - 1, image.Height - 1); System.IO.MemoryStream ms = new System.IO.MemoryStream(); image.Save(ms, System.Drawing.Imaging.ImageFormat.Gif); Response.ClearContent(); Response.ContentType = "image/Gif"; Response.BinaryWrite(ms.ToArray()); } finally { g.Dispose(); image.Dispose(); } } ...展开收缩
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