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addResource

Added by Nezar Ab almost 9 years ago

Can anyone guide me through the process of creating a static global resource that serves xml ? I'm trying to create a REST web service but I have no idea where to start. I just keep getting core dumps.

Thanks in advance.


Replies (4)

RE: addResource - Added by Mark Petryk almost 9 years ago

Nezar, certainly! It is brain-dead simple. I apologize for the imbedded Qt... I'm a Qt freak, and lean on it too heavily sometimes... I'll let you remove it.

First, create a class as a resource:

921 class MYDBUTIL : public WResource

922 {

923 public:

924 MYDBUTIL( WObject * parent = NULL )

925 : WResource(parent)

926 {

927 dboSession = new XYZ::Session(DBNAME);

928 }

929

930 ~MYDBUTIL()

931 {

933 delete dboSession;

934 }

935

949 std::string getField( const Wt::Http::Request & request, const std::string & fieldName )

950 {

951 std::string retVal;

952

953 const std::string * param = request.getParameter(fieldName);

954 if( param )

955 retVal = *param;

956

957 return retVal;

958 }

959

960 void handleRequest( const Wt::Http::Request & request, Wt::Http::Response& )·

961 {·

962 qDebug() << Q_FUNC_INFO;·

963 qDebug() << QString::fromStdString( request.method() );·

964 debugField( request, "a" );

965

966 std::string action = getField(request,"a");

967

968 if( action \"tableCreationSql\" )
969 qDebug() << QString::fromStdString( dboSession-> tableCreationSql() );
970
971 if( action "dropTables" )

972 {

973 dboSession-> dropTables();

974 qDebug() << "tables dropped";

975 }

976

987

988 }

989

990

991 XYZ::Session * dboSession;

992

993 };

994

Then, in your main() function, set up the resource;

1059 server = new Wt::WServer( argc, argv, WTHTTP_CONFIGURATION );

1060

1061 server-> addResource( new MYSUBMIT(), "/submit" );

1062 server-> addResource( new MYDBUTIL(), "/dbutil" );

1063 server-> addResource( new MYCYFEAPI(), "/cyfeapi" );

1064

Now, when you browse to your site, and access the resource by URL, you will activate your Resource class;

http://your-wt-site.com/dbutil?a=tableCreationSql

If you want to send your response, you could rewrite your handleRequest like this;

1034 void handleRequest( const Wt::Http::Request & request, Wt::Http::Response & response )·

1035 {·

1036 qDebug() << Q_FUNC_INFO;·

1037 qDebug() << QString::fromStdString( request.method() );·

1038 ·

1039 std::string action = getField(request,"q");·

1040 ·

1041 if( action == "1" )·

1042 {·

1043 qDebug() << "sending json response";·

1044 ·

1045 response.out() << "this is a test" << std::endl;·

1046 }·

1047 ·

1048 }·

Hope this helps.

RE: addResource - Added by Wim Dumon almost 9 years ago

and examples/blog/BlogRSSFeed is also a fully integrated example of this.

Wim.

RE: addResource - Added by Nezar Ab almost 9 years ago

Thank you Mark, Thank you Wim.

I really appreciate your help.

I have also found a very good example on Ed's tech corner : eduardo-lago.blogspot.com/2013/05/creating-rest-web-service-using.html

It would be helpful for anyone who might want to create a web service in Wt.

I really like the idea of being able to implement a service without the need for WApplication !!

Wt Rocks !! :)

RE: addResource - Added by Mark Petryk almost 9 years ago

Glad you got it working, Nezar. Thanks for the link as well.

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