C#图片转成流,流转成图片,字节转图片,图片转字节的方法
图片转成流
Bitmap b = new Bitmap(Server.MapPath(ppath)); Stream ms = new MemoryStream(); b.Save(ms, System.Drawing.Imaging.ImageFormat.Jpeg);
流转成图片
MemoryStream ms = new MemoryStream(Bytes); return Bitmap.FromStream(ms,true);
字节转图片
/// <summary> /// 字节数组生成图片 /// </summary> /// <param name="Bytes">字节数组</param> /// <returns>图片</returns> private Image byteArrayToImage(byte[] Bytes) { MemoryStream ms = new MemoryStream(Bytes); return Bitmap.FromStream(ms,true); }
图片转字节
/// <summary> /// 根据图片路径返回图片的字节流byte[] /// </summary> /// <param name="imagePath">图片路径</param> /// <returns>返回的字节流</returns> privatestaticbyte[] getImageByte(stringimagePath) { FileStream files = newFileStream(imagePath, FileMode.Open); byte[] imgByte = newbyte[files.Length]; files.Read(imgByte, 0, imgByte.Length); files.Close(); returnimgByte; }
剪切图片与将剪切的图片生成内存流MemoryStream
int pw = 60; int ph = 15; int px =80; int py = 100; ppath = @"d:\123.jpg"; Bitmap b = new Bitmap(ppath); //剪裁图片 RectangleF rec = new RectangleF(px, py, pw, ph); Bitmap nb = b.Clone(rec, System.Drawing.Imaging.PixelFormat.Format32bppArgb); //剪切后并读入到流中去 Stream ms = new MemoryStream(); nb.Save(ms, System.Drawing.Imaging.ImageFormat.Jpeg);
看云吧 kanyun8.com