vb.net获取网页源码 获取网页源代码
VB怎么获取网页源码
1）使用MICROSOFT INTERNET TRANSFER CONTROL的，代码如下：
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Dim strhtml As String
Dim STRURL As String
STRURL=""
strhtml = Inet1.OpenURL(STRURL)
2）用System.Net命空间下的HttpWebRequest来取得，代码如下：
Dim url As String=" " ' 网址
Dim httpReq As System.Net.HttpWebRequest
Dim httpResp As System.Net.HttpWebResponse
Dim httpURL As New System.Uri(url)
httpReq = CType(WebRequest.Create(httpURL), HttpWebRequest)
httpReq.Method = "GET"
httpResp = CType(httpReq.GetResponse(), HttpWebResponse)
httpReq.KeepAlive = False ' 获取或设置一个值，该值指示是否与 Internet资源建立持久连接。
Dim reader As StreamReader = _
New StreamReader(httpResp.GetResponseStream,
System.Text.Encoding.GetEncoding(-0))
Dim respHTML As String = reader.ReadToEnd() 'respHTML就是网页源代码.
vb.net中如何利用api函数获取网页源代码？？？
Dim MyClient As WebClient = New WebClient
Dim MyReader As New System.IO.StreamReader(MyClient.OpenRead(url), System.Text.Encoding.Default) '定义新的文件流并读取网页文件数据，url表示需要打开的网页地址
Dim longTxt As String = MyReader.ReadToEnd 'longtxt存储了网页的源码
MyReader.Close()
如何用vb.net获得网页的源代码
Dim url As String=" 网址"
Dim httpReq As System.Net.HttpWebRequest
Dim httpResp As System.Net.HttpWebResponse
Dim httpURL As New System.Uri(url)
httpReq = CType(WebRequest.Create(httpURL), HttpWebRequest)
httpReq.Method = "GET"
httpResp = CType(httpReq.GetResponse(), HttpWebResponse)
httpReq.KeepAlive = False ' 获取或设置一个值，该值指示是否与
Internet资源建立持久连接。
Dim reader As StreamReader = _
New StreamReader(httpResp.GetResponseStream,
System.Text.Encoding.GetEncoding(-0))
Dim respHTML As String = reader.ReadToEnd() 'respHTML就是网页源代码
VB.NET 不使用控件获取某网页源代码
Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click
Dim MyClient As Net.WebClient = New Net.WebClient
Dim MyReader As New System.IO.StreamReader(MyClient.OpenRead(""), System.Text.Encoding.Default)
Dim MyWebCode As String = MyReader.ReadToEnd
Me.RichTextBox1.Text = MyWebCode
MyReader.Close()
End Sub
VB.NET获取需要登录后的源码
很简单的。这个最基本的了。
就是从数据库表中 找出一个记录，名称和密码都和你输入的一样的记录，就表示登陆成功。
简单的思路：（密码也没有加密等）
dim dt As New DataTable
dim cmd As New SqlCommand
With cmd
.CommandText = "Select * From Users Where UserName=@UserName and UserPwd=@UserPwd"
.Parameters.Add(New SqlClient.SqlParameter("@UserName", "=你输入的用户名TextBox1.Text"))
.Parameters.Add(New SqlClient.SqlParameter("@strColorNo", "=你输入的密码TextBox2.Text"))
End With
dt =SqlHelper.GetDatatable(cmd)
if dt.rows.count0 then
msgbox "ok"
else
msgbox "error"
end if
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