Delphi XE2 XML And SOAP Web Services.41 [PATCHED]
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How to Create and Consume XML and SOAP Web Services in Delphi XE2
Web services are a way of exchanging data between different applications or platforms over the internet. They use standard protocols such as XML and SOAP to communicate and exchange information. In this article, we will learn how to create and consume XML and SOAP web services in Delphi XE2.
Creating a Web Service
To create a web service in Delphi XE2, we need to use the WebBroker framework, which provides the components and tools for building web applications and services. We can use the Web Service Application wizard to create a web service project with the following steps:
Select File > New > Other > Delphi Projects > WebBroker > Web Service Application.
Choose the type of web service you want to create: SOAP or XML Data Packet.
Choose the target platform: Windows or Linux.
Choose the web server: Apache, IIS, or Stand-alone.
Enter the project name and location.
Click Finish.
The wizard will generate a web service project with a unit that contains the interface and implementation of the web service. The interface section defines the methods and types that the web service exposes to the clients. The implementation section contains the code that executes the web service methods. For example, if we create a SOAP web service named Calculator, we will have a unit like this:
unit Calculator;
interface
uses
InvokeRegistry, Types, XSBuiltIns;
type
ICalculator = interface(IInvokable)
['{B8F9C6B7-8A4F-4C0D-9A0F-7D8A3B6F9D5C}']
function Add(A, B: Integer): Integer; stdcall;
function Subtract(A, B: Integer): Integer; stdcall;
function Multiply(A, B: Integer): Integer; stdcall;
function Divide(A, B: Integer): Integer; stdcall;
end;
implementation
uses
SysUtils;
type
TCalculator = class(TInvokableClass, ICalculator)
public
function Add(A, B: Integer): Integer; stdcall;
function Subtract(A, B: Integer): Integer; stdcall;
function Multiply(A, B: Integer): Integer; stdcall;
function Divide(A, B: Integer): Integer; stdcall;
end;
function TCalculator.Add(A, B: Integer): Integer;
begin
Result := A + B;
end;
function TCalculator.Subtract(A, B: Integer): Integer;
begin
Result := A - B;
end;
function TCalculator.Multiply(A, B: Integer): Integer;
begin
Result := A * B;
end;
function TCalculator.Divide(A, B: Integer): Integer;
begin
if B = 0 then
raise EDivByZero.Create('Cannot divide by zero');
Result := A div B;
end;
initialization
InvRegistry.RegisterInvokableClass(TCalculator);
end.
To test the web service, we can run the project and open the browser at http://localhost/calculator.wsdl (or http://localhost/calculator.xml for XML Data Packet). This will show the WSDL (or XML Schema) document that describes the web service interface and operations. We can also invoke the web service methods using a test page at http://localhost/calculator.soap (or http://localhost/calculator.xdp for XML Data Packet).
Consuming a Web Service
To consume a web service in Delphi XE2, we need to use the WSDL Importer tool, which generates a proxy unit that contains the classes and methods to access the web service. We can use the WSDL Importer wizard to import a web service with the following steps:
Select File > New > Other > Delphi Projects > WebServices > WSDL Importer.
Enter the URL of the WSDL document of the web service you want to import.
Choose the options for generating the proxy unit.
Click Finish.
The wizard will generate a proxy unit that contains the interface and implementation of the client classes and methods. The interface section defines the types and interfaces aa16f39245