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_llseek info  Overview  Group

The _llseek function repositions the file pointer in a previously opened file. This function is provided for compatibility with 16-bit versions of Windows. Win32-based applications should use the SetFilePointer function.

LONG _llseek(

    HFILE hFile,

// handle to file

    LONG lOffset,

// number of bytes to move

    int iOrigin 

// position to move from



Identifies the file.
Specifies the number of bytes the file pointer is to be moved.
Specifies the starting position and direction of the file pointer. This parameter must be one of the following values:




Moves the file pointer lOffset bytes from the beginning of the file.


Moves the file pointer lOffset bytes from its current position.


Moves the file pointer lOffset bytes from the end of the file.

Return Values

If the function succeeds, the return value specifies the new offset of the pointer, in bytes, from the beginning of the file.

If the function fails, the return value is HFILE_ERROR. To get extended error information, call GetLastError.


When a file is initially opened, the file pointer is set to the beginning of the file. The _llseek function moves the pointer an arbitrary amount without reading data, which facilitates random access to the file’s contents.

See Also

_lopen, SetFilePointer


See also:

file: /Techref/os/win/api/win32/func/src/f00_4.htm, 3KB, , updated: 2001/6/26 10:34, local time: 2022/5/20 09:25,

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