1. Function To Delete A File In C Programming

Works with: IDENTIFICATION DIVISION.PROGRAM-ID. Delete-Files- 2.ENVIRONMENT DIVISION.INPUT-OUTPUT SECTION.FILE-CONTROL.SELECT Local- File ASSIGN TO 'input.txt'.SELECT Root- File ASSIGN TO '/input.txt'.DATA DIVISION.FILE SECTION.FD Local- File.01 Local- Record PIC X.FD Root- File.01 Root- Record PIC X.PROCEDURE DIVISION.DELETE FILE Local- FileDELETE FILE Root- FileGOBACK. (delete-file (make-pathname: name 'input.txt' ) )(delete-file (make-pathname: directory ' (: absolute ' ): name 'input.txt' ) )To delete directories we need an implementation specific extension. In clisp this is ext:delete-dir.

Library:This image is a, an executable image of code. The LabVIEW version is shown on the top-right hand corner. You can download it, then drag-and-drop it onto the LabVIEW block diagram from a file browser, and it will appear as runnable, editable code. // delete filelocal(f = file('input.txt'))#f-delete// delete directory// directory must be empty before it can be successfully deleted.

A failure is generated if the operation fails.local(d = dir('docs'))#d-delete// delete file in root file system (requires permissions at user OS level)local(f = file('//input.txt'))#f-delete// delete directory in root file system (requires permissions at user OS level)// directory must be empty before it can be successfully deleted. A failure is generated if the operation fails.local(d = file('//docs'))#d-delete ' show where we areprint DefaultDir$' in herekill 'input.txt'result = rmdir ( 'Docs' )' from rootkill 'input.txt'result = rmdir ( 'Docs' ) Delete file 'input.txt' in cwd:- note: fileIO xtra is shipped with Director, i.e.

An 'internal'fp = xtra('fileIO').newfp.openFile('input.txt', 0)fp.deleteDelete file 'input.txt' in root of current volume:- note: fileIO xtra is shipped with Director, i.e. An 'internal'pd = the last char of movie.path - ' for win, ':' for macplayer.itemDelimiter = pdvol = movie.path.item1fp = xtra('fileIO').newfp.openFile(vol&pd&'input.txt', 0)fp.deleteDeleting a directory requires a 3rd party xtra, but there are various free xtras that allow this.

Function To Delete A File In C Programming

Here as example usage of BinFile xtra:- delete (empty) directory 'docs' in cwdbxfolderdelete('docs')- delete (empty) directory 'docs' in root of current volumepd = the last char of movie.path - ' for win, ':' for macplayer.itemDelimiter = pdvol = movie.path.item1bxfolderdelete(vol&pd&'docs') era, 'input.txt'( RSX command, therefore prefixed with a vertical bar. Also, there are no subdirectories in AMSDOS.). Works with: version R6RS (delete -file filename ) The library provides the functions. RemoveFile removes a file of any type unless it is a directory that is not empty. RemoveTree remove a file of any type inclusive a directory tree.

Pelton crane 420c manual. Note that removeFile and removeTree fail with the exception when the file does not exist.$ include 'seed705.s7i';include 'osfiles.s7i';const proc: main is funcbeginremoveFile('input.txt');removeFile('/input.txt');removeTree('docs');removeTree('/docs');end func; # here%f 'input.txt' - delete;%d 'docs' - delete;# root dirDir. Root +%f 'input.txt' - delete;Dir.

Root +%d 'docs' - delete; (It will succeed deleting the directory if it is empty)(File newNamed: 'input.txt') delete.(File newNamed: '/input.txt') delete.(Directory newNamed: 'docs') delete.(Directory newNamed: '/docs') delete.Also:(Directory current / 'input.txt') delete.(Directory root / 'input.txt') delete.

How should i remove the record of a particular student or Update.To update a record, you can simply fseek to point back at the record beginning in the file and then proceed as when you write data. To remove, this is a bit less easy, you could for instance swap the current record and the very last one in the file and truncate the file (to pop the last record).

The 'truncation' part is system-dependent (this problem was discussed in another thread, try to find it). Or you can rewrite the entire file too, which is not that bad (depending on your program performance constraints). The truncation method doesn't suit you? Because it looks like you didn't read that part of the reply.EDIT: if there's no solution to easily erase random bytes in a file is that for most filesystems, the actual data is divided in blocks and dispatched on the disk, deleting data would imply to reorganize all those blocks, which is an operation very specific to the filesystem and to the operating system, as far as I know there's no mean to achieve that. But you can rewrite yourself your data and then truncate the file, this is much more acceptable (for the FS it only implies to deallocate the last blocks). Code: remove('c:file.txt');rename('c:file2.txt','c:file.txt');Here's a good advice: always check the return status of the functions you call.

Every standard function proposes a mean to tell whether it has succeeded or failed and often you can get a detailed explanation (cf errno, strerror.). You cannot simply call all those functions and assume everything will be allright everytime, besides you should apply the same rule to your functions.So check the status of the functions that fail and you'll get your answer. The old fashion way.I am actually quite puzzled that wherever i have looked at i mean in books and searched the net all over. Everyone keep suggesting me the same idea. Create another file copy all the the data except the one you want to delete then delete the file and rename the new one to old one.theres got to be way to actually delete some real time data in a file!!I will wait for an answer!The answer is:You don't actually delete a record, when you delete a record!

You have a field in the record that you mark, telling your database that this record is current, or that the record is not current, and it can be over-written with a new record.When the database records become too 'fragmented', (too many old records, no longer a part of the current database), then the entire database may be 'compacted'. Finally, old records are overwritten by active records, and thus finally, deleted.It's a clever trick. Looks like the handle is not released by the fcloseall method or the file is still in use when its being removed can you check it?Even if someone tries it and find out that it works, would it solve your problem? You should try to find why it doesn't work in your case. Try to isolate the relevant part of you code and build the smallest code that reproduce the error, then you will be able to understand and fix it.You should also try to review your whole code, the refresh function is useless, don't use fflush(stdin) (cf FAQ) and at last notice that for fcloseall: 'the standard streams (stdin, stdout and stderr) are also closed.'

And be sure to check the status of every I/O call you use.