Set the current position for reading and writing
Source position: amigados.pas line 1622
function DOSSeek( |
file_: LongInt; |
position: LongInt; |
offset: LongInt |
):LongInt; |
file_ |
|
Pointer to file handle. |
position |
|
Value to seek (can be also negative for OFFSET_CURRENT or OFFSET_END) |
Returns the position before the seek.
DosSeek() sets the read/write cursor for the file file to the position 'position'. This position is used by both DosRead() and DosWrite() as a place to start reading or writing. The result is the current absolute position in the file, or -1 if an error occurs, in which case IoErr() can be used to find more information. mode can be OFFSET_BEGINNING (Start seek from file start), OFFSET_CURRENT (start seek from current position) or OFFSET_END (start seek from end of file). It is used to specify the relative start position. For example, 20 from current is a position 20 bytes forward from current, -20 is 20 bytes back from current.
So that to find out where you are, seek 0 from current. The end of the file is a Seek() positioned by 0 from end. You cannot Seek() beyond the end of a file.
|
Read bytes of data from a file |
|
|
Write bytes of data to a file |
|
|
Sets the size of a file |