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PODetermine if a WebService is available or has valid url?
 

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    <p>How can I check if a WebService is available or has a valid url? </p> <p>I am using the Delphi Wizard to import and auto generate the neccessary WSDL functions.</p> <p>The functions the wizard has created for me, doesn't throw an exception nor returns a null object if the WSDL or URL is wrong. Only when I call a function of the returned WSDL class, it throws an strange exception, that the XML-String has not a valid "text/html" style.</p> <p>Here is the auto generated WSDL function:</p> <pre><code>function GetcheckVatPortType(UseWSDL: Boolean; Addr: string; HTTPRIO: THTTPRIO): checkVatPortType; const defWSDL = 'http://ec.europa.eu/taxation_customs/vies/checkVatService.wsdl'; defURL = 'http://ec.europa.eu/taxation_customs/vies/services/checkVatService'; defSvc = 'checkVatService'; defPrt = 'checkVatPort'; var RIO: THTTPRIO; begin Result := nil; if (Addr = '') then begin if UseWSDL then Addr := defWSDL else Addr := defURL; end; if HTTPRIO = nil then RIO := THTTPRIO.Create(nil) else RIO := HTTPRIO; try Result := (RIO as checkVatPortType); if UseWSDL then begin RIO.WSDLLocation := Addr; RIO.Service := defSvc; RIO.Port := defPrt; end else RIO.URL := Addr; finally if (Result = nil) and (HTTPRIO = nil) then RIO.Free; end; end; // ************************************************************************ // // Namespace : urn:ec.europa.eu:taxud:vies:services:checkVat // Transport : http://schemas.xmlsoap.org/soap/http // Stil : document // Verwenden von : literal // Bindung : checkVatBinding // Service : checkVatService // Port : checkVatPort // URL : http://ec.europa.eu/taxation_customs/vies/services/checkVatService // ************************************************************************ // checkVatPortType = interface(IInvokable) ['{0F901373-2432-32E2-C99D-95B53AE83C79}'] // Entpacken nicht möglich: // - Mehrere strenge out-Elemente gefunden function checkVat(const parameters: checkVat): checkVatResponse; stdcall; // Entpacken nicht möglich: // - Mehrere strenge out-Elemente gefunden function checkVatApprox(const parameters: checkVatApprox): checkVatApproxResponse; stdcall; end; </code></pre> <p>If the <code>defWSDL</code> or <code>defURL</code> is invalid or not available, it returns an initiaized <code>checkVatPortType</code> class/interface. Afterward calling a function (<code>checkVatPortType.checkVat</code>) on that returned interface, I get the strange exception.</p> <p>That means, if the WebService is not available the user gets a message that the "XML-String has not a valid "text/html" format". Which doesn't describe the problem.</p>
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