Crestron simpl plus language ref 사용자 설명서

Crestron SIMPL+

Software

Language Reference Guide - DOC. 5797G

SIMPL+

z 143

FileSeek

Name:

FileSeek

Syntax:

SIGNED_INTEGER FileSeek (INTEGER handle, LONG_INTEGER

offset, INTEGER origin )

Description:

Positions the current file pointer.

Parameters:

HANDLE specifies the file handle of previously opened file (from FileOpen).
OFFSET specifies the number of bytes to move relative to the origin.
ORIGIN is on of the file seek flags in the following table.

FileSeek Flags:

Return Value:

Number of bytes offset from the beginning of file. Otherwise, file error code is
returned.

Example:

(Refer to "File Functions Overview"on page

116

)

SIGNED_INTEGER nFileHandle;

StartFileOperations();

nFileHandle = FileOpen(“MyFile”, _O_RDONLY);

IF (nFileHandle >= 0)

{

IF (FileSeek( nFileHandle, 0, SEEK_SET)) < 0 )

PRINT ( “Error seeking file\n” );

IF ( FileClose ( nFileHandle ) <> 0 )

PRINT ( “Error closing file\n” );

EndFileOperations();

}

KEYWORD

FUNCTION

SEEK_SET

Start seeking from beginning of file

SEEK_CUR

Start seeking from current position in file

SEEK_END

Start seeking from end of file