erp/SiteCore/ImageHelper.cs

using System;
using System.Configuration;
using System.Drawing;
using System.IO;
using System.Web;
using Utils.ImageUtils;

namespace SiteCore
{
    public class ImageHelper
    {
        public static string UserPicPath = ConfigurationManager.AppSettings["UserPicPath"];
        public static int oneFileSize = 5 * 1024 * 1024;
        public static string fileFilter = "jpg,jpeg,bmp,png,gif";
        private const string pubExt = ".jpg";
        private const string marker = "csbq.cn";


        //检查目录并创建
        public static void directoryChkMD(string sPath)
        {
            if (!Directory.Exists(sPath))
            {
                Directory.CreateDirectory(sPath);
            }
        }


        /// <summary>
        /// 检测图片是否符合
        /// </summary>
        /// <param name="postedFile"></param>
        /// <param name="errMsg"></param>
        /// <returns></returns>
        public static bool CheckImage(HttpPostedFile postedFile, out string errMsg)
        {
            errMsg = "";
            if (postedFile == null || postedFile.FileName == "")
            {
                errMsg = "请选择要上传的图片";
                return false;
            }
            if (postedFile.ContentLength > oneFileSize)
            {
                errMsg = "上传的图片大小不允许超过5MB";
                return false;
            }
            string sourceExt = Path.GetExtension(postedFile.FileName);
            sourceExt = sourceExt.TrimStart('.');
            //属于这类扩展名
            if (fileFilter.IndexOf(sourceExt, StringComparison.OrdinalIgnoreCase) == -1)
            {
                errMsg = "请上传扩展名为:" + fileFilter + "的图片";
                return false;
            }
            return true;
        }

        /// <summary>
        /// 上传用户图片
        /// </summary>
        /// <param name="postedFile"></param>
        /// <param name="uCode"></param>
        /// <param name="errMsg"></param>
        /// <returns></returns>
        public static string UpLoadUserPic(HttpPostedFile postedFile, string uCode, out string errMsg)
        {
            //检测成功
            if (CheckImage(postedFile, out errMsg))
            {
                try
                {
                    using (Image im = Image.FromStream(postedFile.InputStream))
                    {
                        //if (im.Width > 800 && im.Height > 700)
                        //{
                        //    errMsg = "上传图片的宽度和高度不能超过800(宽)*700(高)";
                        //    return "";
                        //}
                        //自定义图片名
                        string fileName = uCode;
                        string _imgPath = UserPicPath;
                        directoryChkMD(_imgPath);
                        string _imgFile = Path.Combine(_imgPath, fileName + pubExt);
                        ImageMaker.ToThumbnailImages(im, _imgFile, 120, 110);
                        return fileName + pubExt;
                    }
                }
                catch
                {
                    errMsg = "对不起,上传照片发生错误!";
                }
            }
            return "";
        }
    }
}