MSXML2.XMLHTTP 发送方法适用于早期绑定，后期绑定失败 [英] MSXML2.XMLHTTP send method works with early binding, fails with late binding

问题描述

下面的代码有效.但是，如果我注释掉 Dim objRequest As MSXML2.XMLHTTP 行并取消注释 Dim objRequest As Object 行，它会失败并显示错误消息:

The code below works. But if I comment out the line Dim objRequest As MSXML2.XMLHTTP and uncomment the line Dim objRequest As Object it fails with the error message :

参数不正确

为什么，我能做些什么(如果有的话)?

Why, and what (if anything) can I do about it?

Public Function GetSessionId(strApiId, strUserName, strPassword) As String

    Dim strPostData As String

    Dim objRequest As MSXML2.XMLHTTP
    'Dim objRequest As Object '

    strPostData = "api_id=" & strApiId & "&user=" & strUserName & "&password=" & strPassword

    Set objRequest = New MSXML2.XMLHTTP
    With objRequest
        .Open "POST", "https://api.clickatell.com/http/auth", False
        .setRequestHeader "Content-Type", "application/x-www-form-urlencoded"
        .send strPostData
        GetSessionId = .responseText
    End With

End Function

<小时>

Corey，是的，我知道我必须这样做才能让我的代码在不引用 MSXML 类型库的情况下工作.这不是这里的问题.无论我是否使用

---

Corey, yes, I know I would have to do that in order for my code to work without a reference to the MSXML type library. That's not the issue here. The code fails when using Dim objRequest As Object regardless of whether I use

使用引用设置 objRequest = NEW MSXML2.XMLHTTP，或

设置 objRequest = CreateObject("MSXML2.XMLHTTP") 没有引用.

推荐答案

由于某种原因，这行得通:

For some reason, this works:

Dim strPostData As String
Dim objRequest As Object

strPostData = "api_id=" & strApiId & "&user=" & strUserName & "&password=" & strPassword

Set objRequest = New MSXML2.XMLHTTP
With objRequest
  .Open "POST", "https://api.clickatell.com/http/auth", False
  .setRequestHeader "Content-Type", "application/x-www-form-urlencoded"
  .send (strPostData)
   GetSessionId = .responseText
End With

不要通过字符串连接构建 URL 编码的 strPostData，强烈建议使用 URL 编码函数:

Instead of building the URL-encoded strPostData via string concatenation, it's strongly advisable to use a URL encoding function:

strPostData = "api_id=" & URLEncode(strApiId) & _
              "&user=" & URLEncode(strUserName) & _
              "&password=" & URLEncode(strPassword)

VBA 中 URLEncode() 函数的几个选择在此线程中:如何在 Excel VBA 中对字符串进行 URL 编码?

A couple of choices for a URLEncode() function in VBA are in this thread: How can I URL encode a string in Excel VBA?

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