SharpDressedMan Posted April 13, 2015 Share Posted April 13, 2015 Hi all, I'd like to open an existing file for both reading and writing. (Just like the C function fopen() does with parameter mode = "r+"). I tried FileOpen() with parameter mode = $FO_OVERWRITE (2) but this erases the file content right at opening... Can someone explain me how to do that, if possible ? AutoIt help for function FileSetPos() let me think that both reading and writing to a file is allowed with AutoIt, but how doing so with an existing file ? Thanks by advance for your help. Link to comment Share on other sites More sharing options...
JohnOne Posted April 13, 2015 Share Posted April 13, 2015 $FO_OVERWRITE What did you think it would do? What other flags did you see in the help file? AutoIt Absolute Beginners Require a serial Pause Script Video Tutorials by Morthawt ipify Monkey's are, like, natures humans. Link to comment Share on other sites More sharing options...
Trong Posted April 13, 2015 Share Posted April 13, 2015 All in Help File ! Try: FileOpen( "file",1+8) $FO_READ (0) = Read mode (default) $FO_APPEND (1) = Write mode (append to end of file) $FO_OVERWRITE (2) = Write mode (erase previous contents) $FO_CREATEPATH (8) = Create directory structure if it doesn't exist (See Remarks). $FO_BINARY (16) = Force binary mode (See Remarks). $FO_UNICODE or $FO_UTF16_LE (32) = Use Unicode UTF16 Little Endian reading and writing mode. Reading does not override existing BOM. $FO_UTF16_BE (64) = Use Unicode UTF16 Big Endian reading and writing mode. Reading does not override existing BOM. $FO_UTF8 (128) = Use Unicode UTF8 (with BOM) reading and writing mode. Reading does not override existing BOM. $FO_UTF8_NOBOM (256) = Use Unicode UTF8 (without BOM) reading and writing mode. a Regards, Link to comment Share on other sites More sharing options...
SharpDressedMan Posted April 13, 2015 Author Share Posted April 13, 2015 $FO_OVERWRITE What did you think it would do? What other flags did you see in the help file? Well, fopen(..., "r+") does allow overwriting part of the content of a file if you write to it, but does not overwrite the whole file. That's certainly what I supposed when I tried this flag. Link to comment Share on other sites More sharing options...
SharpDressedMan Posted April 13, 2015 Author Share Posted April 13, 2015 (edited) All in Help File ! Try: FileOpen( "file",1+8) $FO_READ (0) = Read mode (default) $FO_APPEND (1) = Write mode (append to end of file) $FO_OVERWRITE (2) = Write mode (erase previous contents) $FO_CREATEPATH (8) = Create directory structure if it doesn't exist (See Remarks). $FO_BINARY (16) = Force binary mode (See Remarks). $FO_UNICODE or $FO_UTF16_LE (32) = Use Unicode UTF16 Little Endian reading and writing mode. Reading does not override existing BOM. $FO_UTF16_BE (64) = Use Unicode UTF16 Big Endian reading and writing mode. Reading does not override existing BOM. $FO_UTF8 (128) = Use Unicode UTF8 (with BOM) reading and writing mode. Reading does not override existing BOM. $FO_UTF8_NOBOM (256) = Use Unicode UTF8 (without BOM) reading and writing mode. a Thanks Trong but I don't need to create the directory structure; the file I want to open already exists.(All in my post ) Edited April 13, 2015 by SharpDressedMan Link to comment Share on other sites More sharing options...
Trong Posted April 13, 2015 Share Posted April 13, 2015 if it doesn't exist, Else remove it (8) Regards, Link to comment Share on other sites More sharing options...
BrewManNH Posted April 13, 2015 Share Posted April 13, 2015 Use append mode. If I posted any code, assume that code was written using the latest release version unless stated otherwise. Also, if it doesn't work on XP I can't help with that because I don't have access to XP, and I'm not going to.Give a programmer the correct code and he can do his work for a day. Teach a programmer to debug and he can do his work for a lifetime - by Chirag GudeHow to ask questions the smart way! I hereby grant any person the right to use any code I post, that I am the original author of, on the autoitscript.com forums, unless I've specifically stated otherwise in the code or the thread post. If you do use my code all I ask, as a courtesy, is to make note of where you got it from. Back up and restore Windows user files _Array.au3 - Modified array functions that include support for 2D arrays. - ColorChooser - An add-on for SciTE that pops up a color dialog so you can select and paste a color code into a script. - Customizable Splashscreen GUI w/Progress Bar - Create a custom "splash screen" GUI with a progress bar and custom label. - _FileGetProperty - Retrieve the properties of a file - SciTE Toolbar - A toolbar demo for use with the SciTE editor - GUIRegisterMsg demo - Demo script to show how to use the Windows messages to interact with controls and your GUI. - Latin Square password generator Link to comment Share on other sites More sharing options...
SharpDressedMan Posted April 13, 2015 Author Share Posted April 13, 2015 Thanks Trong and BrewManNH, The answer was quite obvious but "append" did not sound to be the right thing to do, to me... as I want the file position to be set at begining of the file. What I need to do to mimic fopen("filename", "r+") is then: $file = FileOpen("filename", $FO_APPEND) FileSetPos($file, 0, $FILE_BEGIN) Thanks for your answers, Link to comment Share on other sites More sharing options...
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