Delphi I/o Error Handling
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Delphi I O Error 103
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Delphi Catch Exception
get an I/O Error 103 with this code? up vote 10 down vote favorite 4 In several of my apps I have code similar to the following: if ForceDirectories(ExtractFilePath(lLogName)) then begin AssignFile(lLog, lLogName); try if FileExists(lLogName) then Append(lLog) else Rewrite(lLog); Writeln(lLog, lLogLine); finally {$I-}CloseFile(lLog);{$I+} end; end; In one application, the first time I try to execute this I consistently get an I/O Error 103 exception on i/o error 32 delphi the line with the Append statement (the file does exist prior to calling this). All subsequent attempts at the operation will work fine however - until I restart the app. All the docs I found about this error so far indicated that this would either be caused by calling CloseFile without prior Reset or Rewrite (Append typically isn't mentioned) or if the file was in use by another process. As the exception occurs before the call to CloseFile it obviously couldn't be the former. I already tried inserting a Reset right after the AssignFile for good measure but then I get the exception on that line. There is also no other application overtly accessing that file. I say "overtly" because I do have a slight suspicion that anti-virus (TrendMicro in my case) might be the cuplrit here (so maybe the file is in use). If that was indeed the problem, what would be the best way around it? Hard-coding an automatic retry does not really feel like a clean solution to me... Another case where I sometimes get the 103 error is this code, which I use to create an empty file (or more of
state. (If the application does not include the System.SysUtils unit, the exception causes the application to terminate). Handling I/O Errors In the {$I-} state, the
I/o Error 32 Windows 7
program continues to execute, and the error is reported by the IOResult
I/o Error 103 Windows 7
function. I/O Error List The following table lists all I/O errors, numbers, and descriptions. Number Name Description 100 Disk i/o error 103 realterm read error Reported by Read on a typed file if you attempt to read past the end of the file. 101 Disk write error Reported by CloseFile, Write, WriteIn, or http://stackoverflow.com/questions/634587/delphi-why-do-i-sometimes-get-an-i-o-error-103-with-this-code Flush if the disk becomes full. 102 File not assigned Reported by Reset, Rewrite, Append, Rename, or Erase if the file variable has not been assigned a name through a call to Assign or AssignFile. 103 File not open Reported by CloseFile, Read Write, Seek, Eof, FilePos, FileSize, Flush, BlockRead, or BlockWrite if the file is not open. 104 File not open http://docwiki.embarcadero.com/RADStudio/Seattle/en/Input-Output_Errors for input Reported by Read, Readln, Eof, Eoln, SeekEof, or SeekEoln on a text file if the file is not open for input. 105 File not open for output Reported by Write or Writeln on a text file if you do not generate a Console application. 106 Invalid numeric format Reported by Read or Readln if a numeric value read from a text file does not conform to the proper numeric format. See Also Exception Handling Resolving Internal Errors (Delphi) Delphi Runtime Errors Fatal errors Operating system errors Retrieved from "http://docwiki.embarcadero.com/RADStudio/Seattle/e/index.php?title=Input-Output_Errors&oldid=227166" Category: RAD Studio ReferenceHidden category: AMMigrate Views Page Discussion View source History Personal tools Create account Log in Search RAD Studio Seattle Seattle Examples and Samples Seattle Libraries Main Page - Seattle Topics Wiki What's New Tutorials FireMonkey Application Platform Multi-Device Applications Getting Started Steps in Developing a Project Key Application Types FireDAC Windows Developer's Guide Modeling Tools IDE Reference and Utilities Delphi Reference C++ Reference Subject Index HTML5 Builder Newer Versions Berlin Topics Previous Versions XE8 Topics XE7 Topics XE6 Topics XE5 Topics XE4 Topics XE3 Topics XE2 Topics XE Topic
DllForms SqlCommands XML XML Extension API MessageBox API DELPHI MemoryLeakage I|OERROR GuestBook Malai http://delphi-techie.faithweb.com/rich_text_4.html Appendix A - Delphi I/O ErrorsThanks goes out to Erik Martin http://www.delphipages.com/forum/showthread.php?t=58954 for posting these Delphi IO errors on his web site. The following are the Windows API (and former DOS) IO errors, which are also the IO errors often returned by Delphi programs, and which are generally difficult to find reference for, and are o error especially difficult to find referenced as Delphi errors.Some of the high-numbered sections toward the end contain Windows API errors which are not truely be IO errors, but which may or may not be reported as such in programs.I/O Error 1:// IO Error 1L// ERROR_INVALID_FUNCTION // MessageText:// Incorrect function.I/O Error 2:// IO Error 2L// ERROR_FILE_NOT_FOUND// MessageText:// o error 103 The system cannot find the file specified.I/O Error 3:// IO Error 3L// ERROR_PATH_NOT_FOUND// MessageText:// The system cannot find the path specified.I/O Error 4:// IO Error 4L// ERROR_TOO_MANY_OPEN_FILES// MessageText:// The system cannot open the file.I/O Error :5// IO Error 5L// ERROR_ACCESS_DENIED// MessageText:// Access is denied.I/O Error 6:// IO Error 6L// ERROR_INVALID_HANDLE// MessageText:// The handle is invalid.I/O Error 7:// IO Error 7L// ERROR_ARENA_TRASHED// MessageText:// The storage control blocks were destroyed.I/O Error 8:// IO Error 8L// ERROR_NOT_ENOUGH_MEMORY// MessageText:// Not enough storage is available to process this command.I/O Error 9:// IO Error 9L// ERROR_INVALID_BLOCK// MessageText:// The storage control block address is invalid.I/O Error 10:// IO Error 10L// ERROR_BAD_ENVIRONMENT// MessageText:// The environment is incorrect.I/O Error 11:// IO Error 11L// ERROR_BAD_FORMAT// MessageText:// An attempt was made to load a program with an// incorrect format.I/O Error 12:// IO Error 12L// ERROR_INVALID_ACCESS// MessageText:// The access code is invalid.I/O Error 13:// IO Error 13L// ERROR_INVALID_DATA// MessageText:// The data is invalid.I/O Error 14:// IO Error 14L// ERROR_OUTOFMEMORY// MessageText:// Not enough storage is a
Search Advanced Search Go to Page... Thread Tools Display Modes #1 06-13-2002, 02:11 PM MrBaseball34 Senior Member Join Date: Jan 2001 Posts: 7,260 Prevent I/O Error 103 Not used to Std. I/O operations... When using AssignFile and CloseFile, I am sometimes getting a 103 error (File is not open). How can I check to see if, in fact, the file is open before the CloseFile call? MrBaseball34 View Public Profile Visit MrBaseball34's homepage! Find all posts by MrBaseball34 #2 06-13-2002, 02:37 PM vandub Member Join Date: Aug 2001 Posts: 44 RE: Prevent I/O Error 103 you could use the {$i-} command then check the ioresult for an error AssignFile(F, FileName); {$I-} Reset(F); {$I+} if IOResult = 0 then MessageDlg('File size in bytes: ' + IntToStr(FileSize(F)), mtInformation, [mbOk], 0) else MessageDlg('File access error', mtWarning, [mbOk], 0); vandub View Public Profile Send a private message to vandub Visit vandub's homepage! Find all posts by vandub #3 06-13-2002, 02:37 PM HTML Senior Member Join Date: Jan 2001 Posts: 2,977 RE: Prevent I/O Error 103 Hello, This site has many examples on File I/O and uses IoResult(should return 0 if successfull) in few places in the snippets. http://homepages.borland.com/efg2lab/Library/Delphi/IO/FileIO.htm If perhaps you can post a snippet of your code that you think cuases the problem , that would help. :-) HTML View Public Profile Send a private message to HTML Visit HTML's homepage! Find all posts by HTML #4 06-13-2002, 10:35 PM PoseFant Senior Member Join Date: Jan 2001 Posts: 1,002 RE: Prevent I/O Error 103 you could use the {$i-} command then check the ioresult for an error AssignFile(F, FileName); {$I-} Reset(F); {$I+} if IOResult = 0 then MessageDlg('File size in bytes: ' + IntToStr(FileSize(F)), mtInformation, [mbOk], 0) else MessageDlg('File access error', mtWarning, [mbOk], 0); --- Regards /Filip I've lost my autosignature ... *sobbing* ... PoseFant View Public Profile Send a private message to PoseFant Visit PoseFant's homepage! Find all posts by PoseFant #5 06-14-2002, 05:34 AM MrBaseball34 Senior Member Join Date: Jan 2001 Posts: 7,260 RE: Prevent I/O Error 103 Hey, Filip, did you just simply copy vandub's post verbatim? Anyway... I want to know how to determine if the file is open b