从网页获取字段值-Lotusscript

Question

我需要使用Lotusscript从网页中读取字段值。本质上，我计划编写一个代理以转到特定的URL，从页面中获取一个值，然后将该值用于它将用户发送到的URL。

有人可以给我指点吗？

A

Answer 1

[2019年12月更新：从Notes 10（于2018年发布）开始，有一个NotesHTTPRequest类与我的代码完全相同。

我一直都这样做，这一点也不难（在Windows上）。我创建了一个类来执行此操作，因此很容易实现。

您怎么称呼它：

Dim internet As New RemoteHTML()
Dim html As String
html = internet.GetHTTP("http://www.texasswede.com/mypage.html")

就是这样，现在您只需从html字符串中提取所需的任何信息即可。

这里是课程：

Option Public
Option Declare

Class RemoteHTML
    Private httpObject As Variant
    Public httpStatus As Integer

    Public Sub New()
        Set httpObject = CreateObject("MSXML2.ServerXMLHTTP")
    End Sub

    Public Function GetHTTP(httpURL As String) As String
        Dim retries As Integer
        retries = 0     
        Do
            If retries>1 Then
                Sleep 1     ' After the two first calls, introduce a 1 second delay betwen each additional call
            End If
            retries = retries + 1   
            Call httpObject.open("GET", httpURL, False)
            Call httpObject.send()
            httpStatus = httpObject.Status
            If retries >= 10 Then
                httpStatus = 0  ' Timeout
            End If
        Loop Until httpStatus = 200 Or httpStatus > 500 Or httpStatus = 404  Or httpStatus = 0
        If httpStatus = 200 Then
            GetHTTP = Left$(httpObject.responseText,16000)
        Else
            GetHTTP = ""
        End If
    End Function


    Public Function GetFile(httpURL As String, filename As String) As Boolean
        Dim session As New NotesSession
        Dim retries As Integer
        Dim stream As NotesStream
        Dim flag As Boolean
        Dim responsebody As variant
        Dim cnt As Long
        Dim buffer As String
        Dim tmp As Byte

        Set stream = session.CreateStream
        retries = 0     
        Do
            If retries>1 Then
                Sleep 1     ' After the two first calls, introduce a 1 second delay betwen each additional call
            End If
            retries = retries + 1   
            Call httpObject.open("GET", httpURL, False)
            Call httpObject.send()
            httpStatus = httpObject.Status
            If retries >= 10 Then
                httpStatus = 0  ' Timeout
            End If
        Loop Until httpStatus = 200 Or httpStatus > 500 Or httpStatus = 404  Or httpStatus = 0
        If httpStatus = 200 Then
            flag = stream.Open(filename, "binary")
            If flag = False Then
                MsgBox "Failed to create " & filename & "..."
                GetFile = False 
                Exit function
            End If
            responsebody = httpObject.ResponseBody
            ForAll r in responsebody
                tmp = r
                Call Stream.Write(Chr$(CInt(tmp)))
                cnt = cnt + 1
            End ForAll
            MsgBox cnt
            GetFile = True
        Else
            GetFile = False
        End If

    End Function

    Private Function getString(ByVal StringBin As string)
        Dim intCount As Long
        getString =""
        For intCount = 1 To LenB(StringBin)
            getString = getString & Chr( Asc(MidB(StringBin, intCount, 1)) )
        Next
    End Function

End Class

Answer 2

如果您的代码将在Windows上运行，则可以使用WinHTTP或XMLHTTP COM类读取网页。如果代码将在任何其他平台上运行，则最好使用Java而不是LotusScript。

Answer 3

[如果您尝试从NotesField阅读，则可以采用以下方法。 Tha Class的创建专门用于将RichText项目导出到html字符串中，以便找到可能存在于NotesRichText项目中的隐藏类型的嵌入图像（粘贴的图形）。函数ExportDoc（）将html响应文本复制到手边文档上的用户定义的字段中：

Public Class RTExporter
    session As NotesSession
    db As NotesDatabase
    doc As NotesDocument
    obj As Variant
    url As String

    Public Sub New()
        Set Me.session = New NotesSession()
        Set db = session.CurrentDatabase
        Set obj = CreateObject("Microsoft.XMLHTTP")
    End Sub

    ' Handles export from eventual NotesRichTextitems in the form of HTml
    Public Function ExportDoc(hostUrl As String, doc As NotesDocument, rtFieldName As String, htmlFieldName As String)
        Dim htmlString As String    

        url = hostUrl & Me.db.FilePath & "/0/" & doc.Universalid & "/" & rtFieldname & "?openfield&charset=utf-8        

        Set Me.doc = doc    

        htmlString = GetHtmlFromField(htmlFieldName)

        Call doc.ReplaceItemValue(htmlFieldName, htmlString)

        Call doc.Save(True, False)
    End Function

    ' Get http response text and store it in <fieldname>
    Private Function GetHtmlFromField(rtFieldName As String) As String
        Dim html As String      

        On Error Goto ERH

        obj.open "GET", Me.url, False, "", ""

        obj.send("")

        GetHtmlFromField = Trim$(obj.responseText)

        Exit Function
ERH:
        GetHtmlFromField = "Error " & Err & ": " & Error & " occured on line: " & Erl
    End Function

End Class