How to use gSOAP with Qt for Web Service Client

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Overview

gSOAP is a portable development toolkit for C and C++ XML Web services and XML data bindings. It supports XML auto-serialization of C/C++ data. Includes WSDL/XSD schema binding tools, stub/skeleton compiler, Web server, SOAP/XML/MIME streaming, XML-RPC. Here is how to use it to build a web service client in Qt.

Preparation

gSOAP package contains pre-built tools in the <code&gt;gsoap/bin&lt;/code&gt; directory.

  • <code&gt;wsdl2h&lt;/code&gt; schema importer
  • <code&gt;soap2cpp&lt;/code&gt; stub/skeleton generator.

You require <code&gt;.wsdl&lt;/code&gt; and <code&gt;.xsd&lt;/code&gt; files of the web service to generate a c++ stub.

Modify your project

  • First use <code&gt;wsdl2h&lt;/code&gt; on a .wsdl file to generate a .h file, then use <code&gt;soap2cpp&lt;/code&gt; on the generated .h file to generate .h and .cpp files to be included in your Qt project.
  • Before using <code&gt;wsdl2h&lt;/code&gt; you have to modify the <code&gt;typemap.dat&lt;/code&gt; file, this file is present in <code&gt;gsoap/ws&lt;/code&gt; directory. Add a line in this file defining the namespace of your web service. Give any name to <code&gt;namespace&lt;/code&gt; and copy string from your .wsdl file following the tag.
&lt;definitions targetNamespace=http://something&amp;gt;<code>

Add this line to &lt;code&amp;gt;typemap.dat&amp;lt;/code&amp;gt; file:

Anything =”http://something”

  • Now run <code&gt;wsdl2h&lt;/code&gt; on .wsdl and .xsd files (from command prompt)
wsdl2h –s -t&amp;lt;path of typemap.dat&amp;gt; –o &lt;name of generated .h file e.g chatpp.h&amp;gt; &lt;path and name of .wsdl file&amp;gt;<code>

(note .xsd file should be in same directory as .wsdl file)

* Then use &lt;code&amp;gt;soapcpp2&amp;lt;/code&amp;gt; on generated .h file &amp;#40;we assume that name of generated file is chatapp.h&amp;amp;#41;

soapcpp2 –i chatpp.h

this will generate multiple files 

soapstub.h<br />soapH.h<br />soapC.cpp<br />soapchatappProxy.h<br />soapchatappProxy.cpp<br />chatapp.nsmap<br />soapchatappsetvice.h<br />soapchatappservice.cpp

and an xml file for each method in defined in .wsdl file.

  • now add
soapstub.h<br />soapH.h<br />soapchatappProxy.h

as headers in to your qt project and then add 

soapC.cpp<br />soapchatppProxy.cpp

as source

  • add include path of yor generated file in .pro file of your qt project or simply copy all of generated files to your project directory. Also add path of “libws2_32.a” in your .pro file I my case it is as under

LIBS += C:/NokiaQTSDK/mingw/lib/libws2_32.a

  • also add stdsoap2.h and stdsoap2.cpp from gsoap directory as header and source in your project.
  • now include chatapp.nsmap and chatappProxy.h in your main.cpp.
  • make an object of chatappProxy and use it to communicate with webservice.

above method worked for me while using gsoap with NokiaQtSDk on windows xp.

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