PDF转换成二进制字符串写入 HTTP 输出流

　　最近项目需要做电子签章，需要网页打开PDF签章后保存：正好复习哈二进制和流的转换：

　　文件转换成二进制字符串写入HTTP输出流

 1  protected void Page_Load(object sender, EventArgs e)
 2         {
 3             try
 4             {
 5                 string path = "Tett.PDF";           //获取文件名
 6                 path = Server.MapPath(path);        //获取物理文件路径
 7                 if (File.Exists(path) == false)
 8                     throw new Exception("找不到PDF文件");
 9                 FileStream fs = File.Open(path, FileMode.Open);
10                 byte[] buffer = new byte[fs.Length];
11                 fs.Read(buffer, 0, buffer.Length);
12                 fs.Close();
13                 Response.ContentType = "application/pdf";
14                 Response.AddHeader("content-disposition", "filename=pdf");
15                 Response.AddHeader("content-length", buffer.Length.ToString());
16                 Response.BinaryWrite(buffer);
17             }
18             catch (Exception exp)
19             {
20                 throw new Exception("错误", exp);
21             }
22             finally
23             {
24                 Response.Flush();
25                 Response.Close();
26                 Response.End();
27             }
28         }

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 　　获取HTTP传入的实体内容保存文件

 1 string path = "Test.PDF";
 2                                 path = Server.MapPath(path);
 3                                 if (File.Exists(path) == false)
 4                                     throw new Exception("找不到PDF文件");
 5                                 using (var inputStream = Request.InputStream)
 6                                 {
 7                                     using (var flieStream = new FileStream(path, FileMode.Create))
 8                                     {
 9     //从当前流中读取所有字节并将其写入到目标流中
10                                         inputStream.CopyTo(flieStream);
11                                     }
12                                 }    

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　　二进制转换成图片

 1  /// <summary>
 2         /// 二进制转换成图片
 3         /// </summary>
 4         /// <param name="Bytes"></param>
 5         /// <returns></returns>
 6         public static Bitmap BytesToBitmap(byte[] Bytes)
 7         {
 8             MemoryStream stream = null;
 9             try
10             {
11                 stream = new MemoryStream(Bytes);
12                 return new Bitmap((Image)new Bitmap(stream));
13             }
14             catch (ArgumentNullException ex)
15             {
16                 throw ex;
17             }
18             catch (ArgumentException ex)
19             {
20                 throw ex;
21             }
22             finally
23             {
24                 stream.Close();
25             }
26         }

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　　图片转换成二进制　　

 1 /// <summary>
 2         /// 图片转换成二进制
 3         /// </summary>
 4         /// <param name="Bitmap"></param>
 5         /// <returns></returns>
 6         public static byte[] BitmapToBytes(Bitmap Bitmap)
 7         {
 8             MemoryStream ms = null;
 9             try
10             {
11                 ms = new MemoryStream();
12                 Bitmap.Save(ms, Bitmap.RawFormat);
13                 byte[] byteImage = new Byte[ms.Length];
14                 byteImage = ms.ToArray();
15                 return byteImage;
16             }
17             catch (ArgumentNullException ex)
18             {
19                 throw ex;
20             }
21             finally
22             {
23                 ms.Close();
24             }
25         }

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 　流转换成文件

 1 using (FileStream fs = new FileStream(path, FileMode.Create))
 2 {
 3     byte[] bytes = new byte[stream.Length];
 4     int numBytesRead = 0;
 5     int numBytesToRead = (int)stream.Length;
 6     stream.Position = 0;
 7     while (numBytesToRead > 0)
 8     {
 9         int n = stream.Read(bytes, numBytesRead, Math.Min(numBytesToRead, int.MaxValue));
10         if (n <= 0)
11         {
12             break;
13         }
14         fs.Write(bytes, numBytesRead, n);
15         numBytesRead += n;
16         numBytesToRead -= n;
17     }
18     fs.Close();
19 }

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   文件转换成流

 1 /// <summary> 
 2 /// 从文件读取 Stream 
 3 /// </summary> 
 4 public Stream FileToStream(string fileName) 
 5 {             
 6     // 打开文件 
 7     FileStream fileStream = new FileStream(fileName, FileMode.Open, FileAccess.Read, FileShare.Read); 
 8     // 读取文件的 byte[] 
 9     byte[] bytes = new byte[fileStream.Length]; 
10     fileStream.Read(bytes, 0, bytes.Length); 
11     fileStream.Close(); 
12     // 把 byte[] 转换成 Stream 
13     Stream stream = new MemoryStream(bytes); 
14     return stream; 
15 }

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