In this recipe, we will see how we can programmatically call a web service using the proxy class generated in the previous recipes. We will see the main steps required in coding the program.
For quickly creating the template code within a program, first create a new program in the ABAP editor using SE80 and open the code of the program in the right-hand side pane. Then, in the left-hand side pane navigate to the customer proxy generated under the
Service Consumer node. Select the name of our consumer proxy and simply drag-and-drop from the left-hand side to the right-hand side pane (within the ABAP editor). The template code will be generated and added to your program. You may modify the code according to your requirements.
We will now dive into the details of the program:
- We first declare an object reference to the
ZST8_CO_ZST8_MYSERVICEproxy class that is generated. We will name the referenceMYPROXY. We then instantiate the object using theCREATE OBJECTstatement. We also specify the logical port name,ZST8_LOGICAL_PORT, created in the previous recipe. This is written within aTRYandENDTRYstatement.
- Then we declare our input and output structures based on the structures generated during the proxy class generation. The
INPUTstructure contains three fields (amount,currency, andlanguage) corresponding to the importing parameters of our function module. Appropriate values are assigned to them.
- Finally, we call the method
ZST8_MY_SPELL_AMOUNTand pass theinputvalues via theINPUTstructure. The result of the execution is the Web service execution and is in theOUTPUTstructure. For printing the words, we can print theOUTPUT-IN_WORDS-WORD.
We first declare an object based on our proxy class. Before calling the method for converting the amount into words we fill the INPUT structure with appropriate values. The two structures INPUT and OUTPUT correspond to the importing and exporting parameters of the function module, respectively. The
ZST8MY_SPELL_AMOUNT method corresponds to the function module we initially used for creating the Web service. We call the method and pass the INPUT structure containing the relevant input values. The
Web service is called and returns the result (amount in words) in the OUTPUT structure.