Procedure Calls

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Batch procedures allow a structured block of statements to be called from with in a Batch Program. Procedure declarations begin with a PROC statement and end with an ENDPROC statement, as follows :-

PROC

REM Procedure body

ENDPROC

Procedure declarations must begin on a new line and can not be declared with in the scope of command grouping using brackets or braces, however, command grouping may be used with in the procedure body. Procedures can not be declared with in another procedure declaration. Conceptually procedure declarations can be thought of as an embedded batch program with in a batch program. A procedure may be passed parameters, similarly to a standard batch program and like a standard batch program the replaceable parameters %0 to %9, %#, %* and %~ become local to the procedure declaration.

Procedures are called using the CALLPROC command and may be called recursively up to 16 levels deep. Consider the following example which prompts a user for a yes or no answer :-

PROC yesno

:again

SET answer=%upper%

ENDPROC

CALLPROC yesno "Continue (Y/N) ?"
ECHO answer is %answer%

WinOne® makes extensive use of procedures when using Dialog Box's.