Batch processing Collection--(2) Custom functions

Knowledge points involved:

1. How to define a function

2. How to pass parameters

3, how to call?

4. How to get the return value

5, Goto:eof and exit/b 0 difference

6. How to handle variables when strings are replaced

7. Concrete examples

Body part:

1. Definition

　　

: functionname       REM parameter is%0,%1,...%n    REM Todo Goto : EOF　　

2. Parameters and Calls

　　

Pager : functionname parameter 1 (corresponding to %1), parameter 2 (corresponding to %2),... Parameter n (corresponds to%n)

4, about the return value, directly modify the global variables, batch is no function return value

5, about the difference between goto:eof and exit/b 0

REM   goto:eof equivalent to the} end tag of the function, returned to the caller's location REM   exit/b 0  ends current cmd, returns ExitCode 0

6. Handling variables in string substitution

1 SetStr_find=%12 SetStr_replace=%23 Setstr_string=%34 5 ::The call command expands its arguments6 ::Call Set "strok=%%str_string:!str_find!=!str_replace!%%"7     8 ::You can also enable variable delay to implement9 ::@echo off&setlocal enabledelayedexpansionTen ::Set "var=!var:%mat%=! One  A Set"Strok=!str_string:%1=%2!"

7. Concrete examples

@echo ifSETLOCALenabledelayedexpansiontitle bat function::Author:lovelp::link:http://www.cnblogs.com/lovelp/p/5720046.htmlSetStr1= "This was a old string"SetStr2= "This is a new string"Echo=::=============================================::Set Variable Strok, global, to implement function return valueSetStrok= ""EchoThe function call statement is:Pager : Func1This is a old string,This is a new stringEchofunction end parameters, respectively,%%0,%%1,%%2,...,%%nPager : Func1%str1%,%str2%EchoThe above results are explanatory function parametersEcho.EchoHere's the point.invoking a custom function to implement a string substitutionEcho.Echo Pager : Fun_replaceOld, older,This was a old stringPager : Fun_replaceOld, older,%str1%Echo.Echo↓↓↓↓ call end, display result ↓↓↓↓↓↓↓Echo%strok%::=============================================Exit/b 0: Fun_replace    SetStr_find=%1    SetStr_replace=%2    Setstr_string=%3        Echothe string to find is:!str_find! EchoThe final replacement string is:!str_replace! Echothe string body is:%str_string%::The call command expands its arguments    ::Call Set "strok=%%str_string:!str_find!=!str_replace!%%"        ::You can also enable variable delay to implement @echo off&setlocal enabledelayedexpansion    ::Set "var=!var:%mat%=!        Set"Strok=!str_string:%1=%2!"GOTO: EOF ::exit/b 0REM(1) After running goto:eof, CMD returns and waits for the next command.REM(2) after running EXIT, CMD will close directly and return to the program that started Cmd.exe or return to "explorer".REM(3) After running exit/b, CMD will close directly and return to the program that started Cmd.exe or return to "explorer".::function name: func1 with colon oh::parameter 1,%0 is the function name itself: Func1::function 2, 3...N is a common parameter.: Func1    Echo%%0Is%0    Echo%%1Is%1    Echo%%2Is%2GOTO: EOF Pause

Batch processing Collection--(2) Custom functions