c# 下載網頁圖片

標籤：

也是比較老的東西了

最近用到

記錄下以免以後忘了

要下載圖片首先要有圖片地址

要有圖片地址就要先把網頁下下來分析下URL

下載網頁一般用兩種方法

1，用 system.net.webclient

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 );}

2,用 System.Net.HttpWebRequest

 

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();}

 

 

至於怎麼找圖片url略過，直接說下載圖片吧

其實和上面一樣，也有兩種方法：

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; //實際讀取的位元組數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);

c# 下載網頁圖片