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By using Delphi 5, can I call a function in web service which is developed in VB.Net and has some parameters and returns an XML? If yes, then what components will I use to call the web service function and the XML that will be returned by that function?
I think that web services (SOAP) support was introduced in Delphi 6.
Upgrading to a newer Delphi version would certainly be the easiest way to get going.
If you can’t, then you need an external library that implements SOAP support.
You can all the way to the HTTP protocol (in essence, SOAP web services are sending a specific form of XML over HTTP or HTTPS), but that is a lot of work.
You might be lucky with RemObjects SDK: it supports SOAP in Delphi, but I’m not sure it supports Delphi 5.
Give the RemObjects people a call or e-mail: they are really helpful, and you might be lucky.
–jeroen