Openfile - Revision history

76.184.213.234 at 18:09, 9 October 2010

2010-10-09T18:09:28Z

76.184.213.234 at 03:41, 8 October 2010

2010-10-08T03:41:01Z

76.184.213.234 at 03:30, 8 October 2010

2010-10-08T03:30:41Z

76.184.213.234 at 03:25, 8 October 2010

2010-10-08T03:25:00Z

76.184.213.234 at 03:23, 8 October 2010

2010-10-08T03:23:48Z

76.184.213.234: Created page with " io.open (filename [, mode]) This function opens a file, in the mode specified in the string mode. It returns a new file handle, or, in case of errors, nil plus an error message..."

2010-10-08T03:22:12Z

Created page with " io.open (filename [, mode]) This function opens a file, in the mode specified in the string mode. It returns a new file handle, or, in case of errors, nil plus an error message..."

New page

io.open (filename [, mode])

This function opens a file, in the mode specified in the string mode. It returns a new file handle, or, in case of errors, nil plus an error message.

The mode string can be any of the following:

* "r": read mode (the default);
* "w": write mode;
* "a": append mode;
* "r+": update mode, all previous data is preserved;
* "w+": update mode, all previous data is erased;
* "a+": append update mode, previous data is preserved, writing is only allowed at the end of file.

* "b": the mode string can also have a 'b' at the end, which is needed to open the file in binary mode.

This string is exactly what is used in the standard C function fopen.

← Older revision		Revision as of 18:09, 9 October 2010
Line 100:		Line 100:
	Writes the value of each of its arguments to the file. The arguments must be strings or numbers. To write other values, use tostring or string.format before write.		Writes the value of each of its arguments to the file. The arguments must be strings or numbers. To write other values, use tostring or string.format before write.

		+	[[collectgarbage]]

	[http://www.lua.org/manual/5.1/manual.html#pdf-io.open Lua Manual - io.open]		[http://www.lua.org/manual/5.1/manual.html#pdf-io.open Lua Manual - io.open]

@@ Line 33: / Line 33: @@
 |}
-Once you have a file open, you can use the standard io functions on it using lua's object oriented syntax:
+= Using an open file =
    file:close ()

@@ Line 32: / Line 32: @@
 |<tt>a+</tt> || <tt>ab+</tt> || <tt>a+b</tt> || open for reading and writing (append if file exists) || end
 |}
 [http://www.lua.org/manual/5.1/manual.html#pdf-io.open Lua Manual - io.open]

@@ Line 1: / Line 1: @@
-  io.open (filename [, mode])
+  openfile (filename [, mode])
 This function opens a file, in the mode specified in the string mode. It returns a new file handle, or, in case of errors, nil plus an error message.
@@ Line 32: / Line 32: @@
 |<tt>a+</tt> || <tt>ab+</tt> || <tt>a+b</tt> || open for reading and writing (append if file exists) || end
 |}

← Older revision		Revision as of 03:23, 8 October 2010
Line 15:		Line 15:

	This string is exactly what is used in the standard C function fopen.		This string is exactly what is used in the standard C function fopen.
		+
		+	{\| class="fopentable"
		+	\|-
		+	!colspan=3\| mode \|\| description \|\| starts..
		+	\|-
		+	\|<tt>r</tt> \|\| <tt>rb</tt> \|\| \|\| open for reading \|\| beginning
		+	\|-
		+	\|<tt>w</tt> \|\| <tt>wb</tt> \|\| \|\| open for writing (creates file if it doesn't exist). Deletes content and overwrites the file. \|\| beginning
		+	\|-
		+	\|<tt>a</tt> \|\| <tt>ab</tt> \|\| \|\| open for appending (creates file if it doesn't exist) \|\| end
		+	\|-
		+	\|<tt>r+</tt> \|\| <tt>rb+</tt> \|\| <tt>r+b</tt> \|\| open for reading and writing \|\| beginning
		+	\|-
		+	\|<tt>w+</tt> \|\| <tt>wb+</tt> \|\| <tt>w+b</tt> \|\| open for reading and writing. Deletes content and overwrites the file. \|\| beginning
		+	\|-
		+	\|<tt>a+</tt> \|\| <tt>ab+</tt> \|\| <tt>a+b</tt> \|\| open for reading and writing (append if file exists) \|\| end
		+	\|}