{"id":11,"date":"2011-09-04T12:20:00","date_gmt":"2011-09-04T12:20:00","guid":{"rendered":"http:\/\/www.automationrepository.com\/?p=11"},"modified":"2011-10-09T00:23:49","modified_gmt":"2011-10-08T18:53:49","slug":"difference-between-call-statement-and-normal-function-call-in-qtp","status":"publish","type":"post","link":"https:\/\/www.automationrepository.com\/wordpress\/2011\/09\/difference-between-call-statement-and-normal-function-call-in-qtp\/","title":{"rendered":"Difference between Call Statement and normal Function Call in QTP"},"content":{"rendered":"
\n
Call<\/strong> is a VBScript Statement that transfers control to a Sub or Function procedure. The syntax of Call statement is – <\/span><\/span><\/div>\n
\n
\n\n\n\n
\n
\n
[Call] functionOrSubName [Argument(s)]<\/span><\/div>\n<\/div>\n<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n<\/div>\n
where, Call is the optional keyword,<\/em><\/div>\n
functionOrSubName <\/span>is the name of the function or sub to be called,<\/span><\/em><\/div>\n
Argument(s) <\/span><\/span>is the comma-delimited list of parameters.<\/span><\/span><\/em><\/div>\n
<\/span>Hence to call a function in QTP, we can write ‘fnFunction()’ or ‘Call fnFunction()<\/span>‘. Lets see what are the differences between calling a function with Call statement and without Call statement.<\/span><\/span><\/a>We’ll check the differences between ‘fnFunction()’ and ‘Call fnFunction()’ based on the following 3 points –<\/span><\/span>a) Case where the function to be called neither has any parameters nor does it return any value:<\/span> In this case, both <\/span><\/span>‘Call fnFunction()’ & <\/span><\/span>‘fnFunction()’ behave in the same manner.<\/span><\/span>
\nExample:<\/span><\/span><\/p>\n
\n
\n\n\n\n
\n
\n
‘—-Function Definition\u00a0<\/span>
\nFunction<\/span> fnNoParam_NoReturnVal()
\nmsgbox<\/span> “No Parameters & No Return Values”<\/span>
\nEnd<\/span> Function
\n
‘—-Function Call<\/span><\/span>
\nfnNoParam_NoReturnVal<\/span>()
\nCall<\/span> <\/span>fnNoParam_NoReturnVal<\/span>()<\/span><\/div>\n<\/div>\n<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n<\/div>\n

In this example, both the function calls behave in the same manner and display the text <\/em>“<\/span>No Parameters & No Return Values<\/span><\/em>” in a message box.<\/em><\/span><\/span><\/p>\n

b) Case where the function to be called has arguments but doesn’t return any value:<\/span><\/span> In a normal function call, the user can pass the parameters with and without parentheses. i.e. both ‘fnFunction(param)’ & ‘fnFunction param’ would work. But if Call statement is used here, parentheses must <\/strong>be provided while passing the arguments, else QTP would throw a run-time error.<\/span><\/span><\/span><\/span>
\nExample:<\/span><\/span><\/span><\/span><\/p>\n

\n
\n\n\n\n
\n
\n
‘—-Function Definition<\/span>
\nFunction<\/span> fnNoReturnVal(param)<\/span>
\u00a0\u00a0\u00a0 msgbox<\/span> param<\/span>
End<\/span> Function<\/span><\/span><\/span><\/div>\n<\/div>\n
\n

‘—-Function Call<\/span>
\nfnNoReturnVal(“some parameter”<\/span>)\u00a0 ‘displays message box<\/span>
\nfnNoReturnVal “some parameter”<\/span>\u00a0 ‘displays message box<\/span><\/p>\n

Call fnNoReturnVal(“some parameter”<\/span>)\u00a0 ‘displays message box<\/span>
\n‘Call fnNoReturnVal “some parameter”\u00a0 ‘runtime error<\/span><\/p>\n<\/div>\n<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n

c) Case where function to be called returns a value:<\/span> In this case, the normal function call (without call statement) can capture the returned value. But if we use Call statement here, the function’s return value can’t be captured.<\/span><\/span><\/div>\n

Example:<\/span><\/span><\/span><\/span><\/p>\n

\n
\n\n\n\n
\n
\n
‘—-Function Definition
\nFunction<\/span> fnReturnsVal()
\nfnReturnsValue = “this string is returned back”<\/span>
\nEnd<\/span> Function<\/span><\/span><\/span><\/div>\n<\/div>\n<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n<\/div>\n

‘—-Function Call<\/span>
\nstr1 = fnReturnsVal() ‘returns value to str1 variable<\/span>
\n‘str2 = Call fnReturnsVal() ‘runtime error<\/span>\u00a0\u00a0\u00a0<\/span><\/p>\n

In this example, ‘<\/span><\/em>str2 = Call<\/span> fnReturnsVal()’ throws a runtime error as Call statement doesn’t allow us to capture function’s returned value.<\/span><\/em><\/span><\/span><\/span><\/span><\/p>\n

\n

If you enjoyed this article, you can join our blog to get free email updates directly in your inbox.<\/p>\n

<\/p>\n

\n<\/form>\n<\/div>\n

\"\"<\/div>\n","protected":false},"excerpt":{"rendered":"

Call is a VBScript Statement that transfers control to a Sub or Function procedure. The syntax of Call statement is – [Call] functionOrSubName [Argument(s)] where, Call is the optional keyword, functionOrSubName is the name of the function or sub to be called, Argument(s) is the comma-delimited list of parameters.<\/p>\n","protected":false},"author":2,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[9],"tags":[10],"class_list":["post-11","post","type-post","status-publish","format-standard","hentry","category-qtp-concepts","tag-call-statement"],"yoast_head":"\nDifference between Call Statement and normal Function Call in QTP - XX<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.automationrepository.com\/wordpress\/2011\/09\/difference-between-call-statement-and-normal-function-call-in-qtp\/\" \/>\n<meta name=\"twitter:label1\" content=\"Written 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