Sunji-posv-net/pos/POSV.Core/HttpApi/DownloadSorePrintImage.cs

using System;
using System.Collections.Generic;
using System.IO;
using System.Linq;
using System.Text;
using JumpKick.HttpLib;
using POSV.Entity;

namespace POSV.HttpApi
{
    public class DownloadSorePrintImage
    {
        protected static NLog.Logger logger = NLog.LogManager.GetCurrentClassLogger();

        public static bool SorePrintImage()
        {
            bool result = true;
            try
            {
                var filePath = Path.Combine(AppDomain.CurrentDomain.BaseDirectory , @"images/bmp");
                if (!Directory.Exists(filePath))
                {
                    Directory.CreateDirectory(filePath);
                }

                List<StorePrintImage> images  = null;
                using(var db = Global.Instance.OpenDataBase)
                {
                    images = db.Query<StorePrintImage>().ToList();
                }

                //有效的图片名称
                List<string> validNames = new List<string>();

                if (images != null && images.Count > 0)
                {
                    foreach(var image in images)
                    {
                        var fileName = string.Empty;
                        if (!string.IsNullOrEmpty(image.StorageFileName) && image.StorageFileName.Contains("/"))
                        {
                            fileName = image.StorageFileName.Substring(image.StorageFileName.LastIndexOf('/') + 1);
                        }

                        if (!string.IsNullOrEmpty(fileName))
                        {
                            validNames.Add(fileName);

                            string targetFileName = filePath + Path.DirectorySeparatorChar + fileName;

                            if (File.Exists(targetFileName))
                            {
                                logger.Info("票头图片{0}已经下载，忽略本次操作", image.StorageFileName);

                                continue;
                            }

                            if (!Global.Instance.Online)
                            {
                                logger.Info("离线，无法下载图片{0}", image.StorageFileName);
                                continue;
                            }

                            var url = image.Url;

                            Http.Get(url).DownloadTo(targetFileName , onProgressChanged: (bytesCopied , totalBytes) => {
                                if (totalBytes.HasValue)
                                {
                                    logger.Info("Downloading: " + (bytesCopied / totalBytes) * 100 + "%");
                                }
                            } ,onSuccess:(header)=> {
                                logger.Info("Download Complete");
                            }).Go();
                        }
                    }
                }

                //清理工作，清理下载的无用的打印图片，节省空间
                DirectoryInfo root = new DirectoryInfo(filePath);
                foreach (FileInfo f in root.GetFiles())
                {
                    if (!validNames.Contains(f.Name))
                    {
                        f.Delete();
                    }
                }
            }
            catch (Exception ex)
            {
                logger.Error(ex , "票头票尾图片下载异常");

                result = false;
            }

            return result;
        }
    }
}