【下载文档:  C# 添加文字水印类代码.txt 】

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C# 添加文字水印类代码
复制代码 代码如下:using System; using System.Collections.Generic; using System.Text; using System.Drawing; using System.IO; using System.Drawing.Imaging; namespace Chen { public class warterfont { public void addtexttoimg(string filename, string text) { if (!File.Exists(System.Web.HttpContext.Current.Server.MapPath(filename))) { throw new FileNotFoundException("the file don't exist!"); } if (text == string.Empty) { return; } //还需要判断文件类型是否为图像类型，这里就不赘述了 Image image = Image.FromFile(System.Web.HttpContext.Current.Server.MapPath(filename)); Bitmap bitmap = new Bitmap(image, image.Width, image.Height); Graphics g = Graphics.FromImage(bitmap); float fontsize = 12.0f; //字体大小 float textwidth = text.Length * fontsize; //文本的长度 //下面定义一个矩形区域，以后在这个矩形里画上白底黑字 float rectx = 0; float recty = 0; float rectwidth = text.Length * (fontsize + 8); float rectheight = fontsize + 8; //声明矩形域 RectangleF textarea = new RectangleF(rectx, recty, rectwidth, rectheight); Font font = new Font("宋体", fontsize); //定义字体 Brush whitebrush = new SolidBrush(Color.White); //白笔刷，画文字用 Brush blackbrush = new SolidBrush(Color.Black); //黑笔刷，画背景用 g.FillRectangle(blackbrush, rectx, recty, rectwidth, rectheight); g.DrawString(text, font, whitebrush, textarea); MemoryStream ms = new MemoryStream(); //保存为jpg类型 bitmap.Save(ms, ImageFormat.Jpeg); //输出处理后的图像，这里为了演示方便，我将图片显示在页面中了 bitmap.Save(System.Web.HttpContext.Current.Server.MapPath("/" + "aa.jpg"), ImageFormat.Jpeg); //保存到磁盘上 System.Web.HttpContext.Current.Response.Clear(); System.Web.HttpContext.Current.Response.ContentType = "image/jpeg"; System.Web.HttpContext.Current.Response.BinaryWrite(ms.ToArray()); g.Dispose(); bitmap.Dispose(); image.Dispose(); } } }