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也是比较老的东西了
最近用到
记录下以免以后忘了
要下载图片首先要有图片地址
要有图片地址就要先把网页下下来分析下URL
下载网页一般用两种方法
using System.Net;
using System.Windows.Forms;
string url = "http://www.cnblogs.com";
string result = null;
try
{
WebClient client = new WebClient();
result = client.DownloadString( url );
}
catch (Exception ex)
{
MessageBox.Show( ex.Message );
}
using System.Net;
using System.IO;
using System.Windows.Forms;
string result = null;
string url = "http://www.cnblogs.com";
WebResponse response = null;
StreamReader reader = null;
try
{
HttpWebRequest request = (HttpWebRequest)WebRequest.Create( url );
request.Method = "GET";
response = request.GetResponse();
reader = new StreamReader( response.GetResponseStream(), Encoding.UTF8 );
result = reader.ReadToEnd();
}
catch (Exception ex)
{
MessageBox.Show( ex.Message );
}
finally
{
if (reader != null)
reader.Close();
if (response != null)
response.Close();
}
至于怎么找图片url略过，直接说下载图片吧
其实和上面一样，也有两种方法：
1，WebRequest和WebResponse
WebRequest request = WebRequest.Create("http://images.cnblogs.com/logo_small.gif");
WebResponse response = request.GetResponse();
Stream reader = response.GetResponseStream();
FileStream writer = new FileStream("x:\\pic.jpg", FileMode.OpenOrCreate, FileAccess.Write);
byte[] buff = new byte[512];
int c = 0; //实际读取的字节数
while ((c=reader.Read(buff, 0, buff.Length)) > 0)
{
writer.Write(buff, 0, c);
}
writer.Close();
writer.Dispose();
reader.Close();
reader.Dispose();
response.Close();
2,WebClient
string url = "http://images.cnblogs.com/logo_small.gif"; string filepath = "x:\\pic.jpg"; WebClient mywebclient = new WebClient(); mywebclient.DownloadFile(url, filepath);
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原文地址：http://www.cnblogs.com/wiseblog/p/4254592.html
