示例#1
0
        public void ProcessRequest(HttpContext context)
        {
            string fileIdentity = context.Request.QueryString["FileIdentity"];

            if (fileIdentity == null || fileIdentity.Trim().Length <= 0)
            {
                throw new ApplicationException("There is no 'FileIdentity'.");
            }
            fileIdentity = Encoding.UTF8.GetString(Convert.FromBase64String(fileIdentity));
            if (context.Request.QueryString["Action"] == "cancel")
            {
                FileUploadManager.DeleteFile(fileIdentity);
                return;
            }
            long   startPosition = 0;
            string startStr      = context.Request.QueryString["StartPosition"];

            if (startStr == null || startStr.Trim().Length <= 0 || !long.TryParse(startStr, out startPosition) || startPosition < 0)
            {
                throw new ApplicationException("There is no 'StartPosition' or 'StartPosition' is invalid.");
            }

            string filePath   = Path.Combine(FileUploadManager.BaseFolder, fileIdentity);
            string folderPath = Path.GetDirectoryName(filePath);

            if (!Directory.Exists(folderPath))
            {
                Directory.CreateDirectory(folderPath);
            }
            Stream stream = context.Request.InputStream;

            using (FileStream fs = new FileStream(filePath, FileMode.OpenOrCreate, FileAccess.Write, FileShare.Write))
            {
                fs.Seek(startPosition, SeekOrigin.Begin);
                byte[] buffer = new byte[4096];
                int    bytesRead;
                while ((bytesRead = stream.Read(buffer, 0, buffer.Length)) != 0)
                {
                    fs.Write(buffer, 0, bytesRead);
                }
                fs.Close();
            }
            context.Response.Write(fileIdentity);
        }
示例#2
0
        /// <summary>
        ///是否为图片
        /// </summary>
        /// <param name="fileIdentity"></param>
        public static bool IsImages(string fileIdentity)
        {
            var result = FileUploadManager.FileExists(fileIdentity);

            if (!result)
            {
                return(false);
            }
            var curentByte = FileUploadManager.GetFileData(fileIdentity, 0, 3);

            if (curentByte.Length < 3)
            {
                return(false);
            }

            //读取文件前三个字节确定文件后缀
            var fileType = curentByte[0].ToString() + curentByte[1].ToString() + curentByte[2].ToString();

            return(fileType.Contains(JPG.ToString()));
        }