VB XMLHTTP 异步调用

最新推荐文章于 2024-09-24 13:37:14 发布

superbirdxp

最新推荐文章于 2024-09-24 13:37:14 发布

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分类专栏：编程文章标签： VB XMLHTTP 异步

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例

Set XmlHttp2 = CreateObject("Msxml2.XMLHTTP")
XmlHttp2.Open "GET", Url, True  
XmlHttp2.setRequestHeader "CONTENT-TYPE", "application/json;charset=utf-8"
XmlHttp2.send PostMsg

1、使用MSXML2.XMLHTTP open中参数设置为True

2、onreadystatechange 进行设置

方式有：1）使用Timer

2)WithEvents声明的DomDocument对象load Xml

3)自定义类，新建类方法来处理事件，然后把类赋给XMLHTTP对象的OnReadyStateChange事件

3、详细内容参考MSDN

https://docs.microsoft.com/en-us/previous-versions/windows/desktop/ms757030(v=vs.85)

Use the onReadyStateChange Property (Visual Basic)

10/27/2016

4 minutes to read

This topic discusses the implementation details necessary to use onreadystatechange notification in Microsoft Visual Basic applications.

Background Information for onReadyStateChange events

The onreadystatechange callback function was not implemented as a COM automation event in the IXMLHTTPRequest and IServerXMLHTTPRequest components. This is because these components are heavily used in scripting environments, many of which do not support COM events. The onreadystatechange callback function was intended to be easy to use when working with scripting clients such as VBScript and JScript.

Because the onreadystatechange property was not implemented through COM-based automation events, Visual Basic (and C/C++) applications need to implement thi