如何批量測試var的長度？

Question

我基本上需要測試一個變量在批處理文件中的時間。例如：

@echo off 
set /p someVar="" 
//some code to figure out how long it is 
cls 
echo someVar is %length% characters long. 
pause 
exit 

所以，如果我輸入

Batch files 

它會說

someVar is 10 characters long. 

Answer 1

基於由@minitech提供的鏈接，這裏是一個腳本，它應該工作：

@echo off 
set /p someVar="" 

::some code to figure out how long it is 

::Start by writing the file to a temp file 
echo %someVar%>"%temp%\tmp.txt" 

:: get the files size in bytes and subtract 3 for the trailing space and newline and delete the temp file 
for %%a in (%temp%\tmp.txt) do set /a length=%%~za & set /a length -=3 & del "%temp%\tmp.txt" 

cls 

echo someVar is %length% characters long. 

pause 

exit