我用HttpRequest类的相关方法抓取html页面的内容,抓取回来的Stream流需要转换成byte[]执行一些处理,
当网页没有经过压缩时可以正常获取Stream用字节表示的流长度,但是当网页经过压缩后,再用stream.Length就会报错:不支持此操作,我知道GZipStream不支持Length属性的,但是我不是已经解压了么,为什么还是不支持呢?请问这种情况该怎么处理?当网页经过gzip压缩时,解压缩
System.IO.Stream stream = new GZipStream(response.GetResponseStream(), CompressionMode.Decompress);
if (name == "")
{
byte[] bytes = new byte[stream.Length];
stream.Read(bytes, 0, bytes.Length-1);
// 设置当前流的位置为流的开始
stream.Seek(0, SeekOrigin.Begin);
reader = new StreamReader(stream, Encoding.GetEncoding(myTool.DetectEncoding_Bytes(bytes)));
}
else
{
reader = new StreamReader(stream, Encoding.GetEncoding(name));
}
html = reader.ReadToEnd() ;
reader.Close();
stream.Close();
当网页没有经过压缩时可以正常获取Stream用字节表示的流长度,但是当网页经过压缩后,再用stream.Length就会报错:不支持此操作,我知道GZipStream不支持Length属性的,但是我不是已经解压了么,为什么还是不支持呢?请问这种情况该怎么处理?当网页经过gzip压缩时,解压缩
System.IO.Stream stream = new GZipStream(response.GetResponseStream(), CompressionMode.Decompress);
if (name == "")
{
byte[] bytes = new byte[stream.Length];
stream.Read(bytes, 0, bytes.Length-1);
// 设置当前流的位置为流的开始
stream.Seek(0, SeekOrigin.Begin);
reader = new StreamReader(stream, Encoding.GetEncoding(myTool.DetectEncoding_Bytes(bytes)));
}
else
{
reader = new StreamReader(stream, Encoding.GetEncoding(name));
}
html = reader.ReadToEnd() ;
reader.Close();
stream.Close();
/* - - - - - - - - - - - - - - - - - - - - - - - -
* Stream 和 byte[] 之间的转换
* - - - - - - - - - - - - - - - - - - - - - - - */
/// <summary>
/// 将 Stream 转成 byte[]
/// </summary>
public byte[] StreamToBytes(Stream stream)
{
byte[] bytes = new byte[stream.Length];
stream.Read(bytes, 0, bytes.Length);
// 设置当前流的位置为流的开始
stream.Seek(0, SeekOrigin.Begin);
return bytes;
}
/// <summary>
/// 将 byte[] 转成 Stream
/// </summary>
public Stream BytesToStream(byte[] bytes)
{
Stream stream = new MemoryStream(bytes);
return stream;
}/* - - - - - - - - - - - - - - - - - - - - - - - -
* Stream 和 文件之间的转换
* - - - - - - - - - - - - - - - - - - - - - - - */
/// <summary>
/// 将 Stream 写入文件
/// </summary>
public void StreamToFile(Stream stream,string fileName)
{
// 把 Stream 转换成 byte[]
byte[] bytes = new byte[stream.Length];
stream.Read(bytes, 0, bytes.Length);
// 设置当前流的位置为流的开始
stream.Seek(0, SeekOrigin.Begin);
// 把 byte[] 写入文件
FileStream fs = new FileStream(fileName, FileMode.Create);
BinaryWriter bw = new BinaryWriter(fs);
bw.Write(bytes);
bw.Close();
fs.Close();
}
/// <summary>
/// 从文件读取 Stream
/// </summary>
public Stream FileToStream(string fileName)
{
// 打开文件
FileStream fileStream = new FileStream(fileName, FileMode.Open, FileAccess.Read, FileShare.Read);
// 读取文件的 byte[]
byte[] bytes = new byte[fileStream.Length];
fileStream.Read(bytes, 0, bytes.Length);
fileStream.Close();
// 把 byte[] 转换成 Stream
Stream stream = new MemoryStream(bytes);
return stream;
}另外,XML的一个应用是序列化,要用到把字符串转化成byte数组,方法:
byte[] bytes = System.Text.UTF8Encoding.UTF8.GetBytes(XmlContent);
相对的,把byte数组转化为字符串的方法则为:
string XmlContent = System.Text.UTFEncoding.UTF8.GetString(bytes);从字符串到流Streambyte[] buffer = System.Text.Encoding.Unicode.GetBytes("faint");
MemoryStream stream = new MemoryStream(buffer);
MemoryStream ms = new MemoryStream(System.Text.Encoding.Default.GetBytes(AObjStr));
这样方便了吧,把想存的东东转化为byte数组,然后压缩一下,网络传输的话也应该很OK了吧
stream转byte[]:
byte[] bt = stream.ToArray();byte[]转stream:
byte[] bt=赋值
MemoryStream ms = new MemoryStream(bt); //内存流FileStream ms = new FileStream(bt); //文件流