File pointer to the file to process, request can add or delete, implementation is similar to the operation of the database,

CodePudding user response:

So-called modify delete file a certain position, is actually read the open files, a then 'a position before the modification and deletion of content + a + modification and deletion of the contents of the content of the modify delete position after b' save to file, and close the file. A, deleting a file, the file b changed its name to the same as the before file a name, that's it,
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