/// <summary> /// 給二進制流添加水印文字并返回 /// </summary> /// <param name="photo">二進制流</param> /// <param name="watermarkText">水印文字</param> /// <param name="watermarkStatus">圖片水印位置 0=不使用 1=左上 2=中上 3=右上 4=左中 9=右下</param> /// <param name="quality">附加水印圖片質量,0-100</param> /// <param name="fontsize">字體大小</param> /// <param name="fontname">字體</param> /// <returns></returns> public byte[] AddWaterText(Byte[] photo, string watermarkText, int watermarkStatus, int quality, int fontsize, string fontname) { Image img = Image.FromStream(new System.IO.MemoryStream(photo));//將圖片流轉換為縮略圖并固定尺寸 Image.GetThumbnailImageAbort callb = new Image.GetThumbnailImageAbort(ThumbnailCallback); Image imgs=img.GetThumbnailImage(300, 300, callb, IntPtr.Zero);Graphics grap = Graphics.FromImage(imgs); Font drawFont = new Font(fontname, fontsize, FontStyle.Regular, GraphicsUnit.Pixel); SizeF crSize; crSize = grap.MeasureString(watermarkText, drawFont); float xpos = 0; float ypos = 0; switch (watermarkStatus) { case 1: xpos = (float)imgs.Width * (float).01; ypos = (float)imgs.Height * (float).01; break; case 2: xpos = ((float)imgs.Width * (float).50) - (crSize.Width / 2); ypos = (float)imgs.Height * (float).01; break; case 3: xpos = ((float)imgs.Width * (float).99) - crSize.Width; ypos = (float)imgs.Height * (float).01; break; case 4: xpos = (float)imgs.Width * (float).01; ypos = ((float)imgs.Height * (float).50) - (crSize.Height / 2); break; case 5: xpos = ((float)imgs.Width * (float).50) - (crSize.Width / 2); ypos = ((float)imgs.Height * (float).50) - (crSize.Height / 2); break; case 6: xpos = ((float)imgs.Width * (float).99) - crSize.Width; ypos = ((float)imgs.Height * (float).50) - (crSize.Height / 2); break; case 7: xpos = (float)imgs.Width * (float).01; ypos = ((float)imgs.Height * (float).99) - crSize.Height; break; case 8: xpos = ((float)imgs.Width * (float).50) - (crSize.Width / 2); ypos = ((float)imgs.Height * (float).99) - crSize.Height; break; case 9: xpos = ((float)imgs.Width * (float).99) - crSize.Width; ypos = ((float)imgs.Height * (float).99) - crSize.Height; break; }grap.DrawString(watermarkText, drawFont, new SolidBrush(Color.Blue), xpos, ypos);byte[] bt = null; using (MemoryStream mostream = new MemoryStream()) { Bitmap bmp = new Bitmap(imgs); bmp.Save(mostream, System.Drawing.Imaging.ImageFormat.Png);//將圖像以指定的格式存入緩存內存流 bt = new byte[mostream.Length]; mostream.Position = 0;//設置留的初始位置 mostream.Read(bt, 0, Convert.ToInt32(bt.Length)); } return bt; }調用方式：//給二進制流加水印文字 byte[] imgData = AddWaterText(item.SignetName, "僅限預覽", 5, 50, 15, "宋體");-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------/// <summary> /// 將二進制流轉換為base64 /// </summary> /// <param name="data"></param> /// <returns></returns> public string ByteToByte64String(byte[] data) { string img = Convert.ToBase64String(data); return img; }調用方式：//二進制流轉換為base64byte[] imgData=new byte[0];string imgBase64=this.ByteToByte64String(imgData);前臺界面顯示let img="data:image/png;base64,"+imgBase64<img src=img/>--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------/// <summary> /// 圖片轉換二進制流方法 /// </summary> /// <param name="path">文件路徑</param> /// <returns></returns> private byte[] Imgbytefromimg(string path) {//方式一 //FileStream f = new FileStream(path, FileMode.Open, FileAccess.Read); //Byte[] imgByte = new Byte[f.Length];//把圖片轉成 Byte型 二進制流 //f.Read(imgByte, 0, imgByte.Length);//把二進制流讀入緩沖區 //f.Close(); //return imgByte;//方式二byte[] bytes = System.IO.File.ReadAllBytes(path); //讀取文件到byte數組 return bytes; }

　　

轉載于:https://www.cnblogs.com/YYkun/p/10148821.html

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