The event is thrown when the connection starts (BEGIN), every time new data is available (READ), and when the connection ends (END).

当连接开始时（BEGIN）、每次新数据可用时（READ），以及连接结束时（END），抛出该事件。

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Then it opens the connection to the MySQL back end for data output.

然后打开对MySQL后端的连接，以便处理数据输出。

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Once the calls through the Wininet library have established a secure connection to the server end, the Visual Basic client application would make the appropriate SOAP calls to send data.

一旦经由wininet库的调用建立了到服务器端的安全连接，Visual Basic客户应用程序将进行恰当的soap调用来发送数据。

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