求教！SQLite存取图片问题！

旧城等待， 2021-11-17 04:38 256阅读 0赞

我最近刚开始研究WP7，在用SQLite存取图片时遇到个问题，希望高手们指点。

图片转换成二进制存到SQLite时是 byte\[14361\]，读出来时却成了byte\[13\]，数据库里图片存储格式是Blob。Why？

这是我的代码：

//把图片转换成二进制存入sqlite
            private byte[] SetPicture()
            {
                BitmapImage bit = new BitmapImage(new Uri("image.jpg", UriKind.Relative));
                Image image = new Image();
                image.Source = bit;
                this.image1.Source = bit;
                WriteableBitmap bmp = new WriteableBitmap(image.Source as BitmapSource);
    
    
                byte[] byteArray;
    
                using (MemoryStream stream = new MemoryStream())
                {
    
                    bmp.SaveJpeg(stream, bmp.PixelWidth, bmp.PixelHeight, 0, 100);
    
                    byteArray = stream.ToArray();
                }
                return byteArray;
            }

private void PhoneApplicationPage_Loaded(object sender, RoutedEventArgs e)
            {
               SQLiteConnection mySqliteDB = new SQLiteConnection("SQLiteDB");
               mySqliteDB.Open();
               SQLiteCommand cmd = mySqliteDB.CreateCommand("select*from FriendTable");
               IEnumerable<Friend> list = cmd.ExecuteQuery<Friend>();
               List<FriendPct> listfd = new List<FriendPct>();
                foreach(Friend item in list.ToList())
                {
                    FriendPct fp = new FriendPct();
                    fp.ID = item.ID;
                    fp.Name=item.Name;
                    fp.Phone = item.Phone;
                    fp.Picture = GetPath(item.Picture);
                    fp.Class = item.Class;
                    fp.Firsttime = item.Firsttime;
                    fp.Lasttime = item.Lasttime;
                    fp.Callcount = item.Callcount;
                    fp.Grade = item.Grade;
                    fp.Popcount = item.Popcount;
                    listfd.Add(fp);
                }
                this.Files.ItemsSource = listfd;
            }
            //二进制数组转图片
            public static Image GetPath(byte[] b)
            {
                try
                {
                    BitmapImage bit = new BitmapImage();
                    Stream ms = new MemoryStream(b);
                    bit.SetSource(ms);
                    Image img = new Image();
                    img.Source = bit;
                    ms.Flush();
                    ms.Close();
                    return img;
                }
                catch (Exception ex)
                {
                    return null;
                }
            }

上面IEnumerable<Friend> list。。。。list中返回的Picture为什么是byte\[13\]呢？

转载于:https://www.cnblogs.com/htfucc/archive/2012/08/02/2620521.html