【转载】VBA–验证是否存在URL
时 间:2023-03-28 10:19:00
作 者:金宇 ID:43 城市:江阴
摘 要:VBA–验证是否存在URL。
正 文:
当我们要处理一个文件时,通常最好先进行测试以确保文件存在,如果我们需要从某个网站下载文件,那么需要先验证这个网址URL是否存在,那么可以通过下列的函数来进行校验。
可以将下列的代码放到新建的模块中,然后可以在窗体的事件中进行调用,例如: WinHTTP_URLExist("http://www.accessoft.com")
Function WinHTTP_URLExist(ByVal sURL As String) As Boolean On Error GoTo Error_Handler #Const WinHTTP_EarlyBind = False 'True => Early Binding / False => Late Binding #If WinHTTP_EarlyBind = True Then Dim oWinHttp As WinHttp.WinHttpRequest Set oWinHttp = New WinHttp.WinHttpRequest #Else Dim oWinHttp As Object Const WinHttpRequestOption_UserAgentString = 0 Const WinHttpRequestOption_EnableRedirects = 6 Set oWinHttp = CreateObject("WinHttp.WinHttpRequest.5.1") #End If Dim lStatusCode As Integer With oWinHttp .Option(WinHttpRequestOption_EnableRedirects) = False .Option(WinHttpRequestOption_UserAgentString) = "curl" .SetTimeouts 3000, 5000, 3000, 5000 .Open "HEAD", sURL, False .Send lStatusCode = .Status End With WinHTTP_URLExist = (lStatusCode = 200) Error_Handler_Exit: On Error Resume Next Set oWinHttp = Nothing Exit Function Error_Handler: '-2147012889 The server name or address could not be resolved '-2147012894 The operation timed out If Err.Number <> -2147012889 And Err.Number <> -2147012894 Then MsgBox "The following error has occurred" & vbCrLf & vbCrLf & _ "Error Source: WinHTTP_URLExist" & vbCrLf & _ "Error Number: " & Err.Number & vbCrLf & _ "Error Description: " & Err.Description & _ Switch(Erl = 0, "", Erl <> 0, vbCrLf & "Line No: " & Erl) _ , vbOKOnly + vbCritical, "An Error has Occurred!" End If Resume Error_Handler_Exit End Function
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