FileSetPos: Difference between revisions

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__NOTOC__
__NOTOC__
{{Server function}}
{{Server client function}}


Sets the current read/write position in the file.
Sets the current read/write position in the file.
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int fileSetPos ( file theFile, int offset )
int fileSetPos ( file theFile, int offset )
</syntaxhighlight>
</syntaxhighlight>
{{OOP||[[file]]:setPos|pos|fileGetPos}}


===Required Arguments===
===Required Arguments===
*'''theFile:''' The file handle of which you want to change the read/write position.
*'''theFile:''' The file handle of which you want to change the read/write position.
*'''offset:''' The new position. This is the number of bytes from the beginning of the file.
*'''offset:''' The new position. This is the number of bytes from the beginning of the file. If this value is larger than the file size, it is limited to 52,428,800 bytes (50 MB).


===Returns===
===Returns===
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     fileClose(hFile)                        -- close the file
     fileClose(hFile)                        -- close the file
else
else
     outputConsole("Unable to open file.dat")
     outputConsole("Unable to open test.dat")
end
end
</syntaxhighlight>
</syntaxhighlight>
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==See Also==
==See Also==
{{File functions}}
{{File functions}}
[[pt-br:fileSetPos]]

Latest revision as of 20:03, 20 December 2023

Sets the current read/write position in the file.

Syntax

int fileSetPos ( file theFile, int offset )

OOP Syntax Help! I don't understand this!

Method: file:setPos(...)
Variable: .pos
Counterpart: fileGetPos


Required Arguments

  • theFile: The file handle of which you want to change the read/write position.
  • offset: The new position. This is the number of bytes from the beginning of the file. If this value is larger than the file size, it is limited to 52,428,800 bytes (50 MB).

Returns

Returns where the offset was actually set at. I.e. if offset was past the end of the file, it will be set at the end of the file, and this position will be returned. Returns false in case of failure (e.g. the specified file handle is invalid).

Example

This example opens a binary file and prints the value of the byte at position 8 to the console.

local hFile = fileOpen("test.dat")          -- attempt to open the file
if hFile then                               -- check if it succeeded
    fileSetPos(hFile, 8)                    -- set the read/write position
    local readByte = fileRead(hFile, 1)     -- read one byte from this position
    outputConsole("Byte at position 8 = " .. string.byte(readByte))     -- output it
    fileClose(hFile)                        -- close the file
else
    outputConsole("Unable to open test.dat")
end

See Also