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DOS学习入门 & 精彩文章（教学室） » How to judge that a TXT document is an empty document

Floor1　xztw	Posted 2006-08-19 22:41
初级用户　Posts 8　Credits 20
How to judge that there is no content in a TXT document

Floor4　namejm	Posted 2006-08-23 00:14
荣誉版主　Posts 1,737　Credits 5,226　From 成都
What kind of document is considered an empty document? If only a document with no content is considered empty, then the method of judging the file size doesn't work, because if you enter N spaces and then save it, the file size must not be 0. At this time, you can only use the form of findstr. test.txt to judge the presence of content to get the correct answer.

Floor5　bagpipe	Posted 2006-08-23 09:43
银牌会员　Posts 425　Credits 1,144　From 北京
The correct above findstr . test.txt>nul&&echo No Empty\|\|echo Empty

Floor6　IceCrack	Posted 2006-08-23 14:07
中级用户　Posts 168　Credits 332　From 天涯
Originally posted by namejm at 2006-8-23 00:14: 　　What kind of document is considered an empty document? If no content is considered an empty document, then the method of judging the file size will not work, because if you enter N spaces and save it, the file size must not be 0... I actually think that judging the file size is also okay. One is that a file with N spaces has a size. So it is okay to use the size. Second, even if the file size of N spaces is 0 bytes. Then such a file is also meaningless. So it can also be ignored

Floor7　sword221	Posted 2006-08-27 03:30
初级用户　Posts 17　Credits 30
What you said is all correct. A document with a size of 0 is generally meaningless, so it can also be regarded as an empty document

Floor8　namejm	Posted 2006-08-27 07:42
荣誉版主　Posts 1,737　Credits 5,226　From 成都
Originally posted by IceCrack at 2006-8-23 14:07: I also think that judging the file size is also possible. A file with N spaces has a size. So using the size is okay. Second, even if the size of a file with N spaces is 0 bytes. Such a file is also meaningless. So it can also be ignored 　　icracrack is wrong here. Now we are investigating the precise definition of an empty file, not the question of whether the file is meaningful or not—files with spaces but no other content are useful to some people, and at this time they are meaningful; but they are not useful to many people, and at this time they are not meaningful; whether they are meaningful or not is different for each person.