HTML5图片canvas等比例缩放后上传

    
    
    
    
    



    
上传图片
    

        选择文件
    
    
结果
    

        

    

        public ActionResult SavePictureByBase64()
        {
            String fileExt = ".jpg";
            try
            {

                String filename = MSCL.Until.GetGuid() + fileExt;
                String filepath = Server.MapPath(UploadFolder);
                String photoFullName = Path.Combine(filepath, filename);
                //创建写入文件 
                FileStream fs1 = new FileStream(photoFullName, FileMode.Create, FileAccess.Write);
                fs1.Close();

                byte[] arr = Convert.FromBase64String(Request["sendData"]);
                MemoryStream ms = new MemoryStream(arr);
                Bitmap bmp = new Bitmap(ms);
                bmp.Save(photoFullName, System.Drawing.Imaging.ImageFormat.Jpeg);
                ms.Close();
                fs1.Close();
                return Json(new { status = true, msg = string.Format("{0}/{1}/{2}", Url, UploadFolderName, filename) });

            }
            catch (Exception ex)
            {
                return Json(new { status = false, msg = "上传失败" });
            }
        }
        #endregion