FilePos sets the current file pointer position of an open file channel. FilePos lets you change where your reading/writing when working with files.
FACTS:
* none
Mini Tutorial:
This example creates a 256 byte file, it then uses the FilePos command to skip into the created file and read bytes 100 to 110. Then finally displaying the FilePos after the read.
; Create a temp file name
File$=TempDir$()+"PB_TestFile.txt"
; Create a File for writing data to
WriteFile File$,1
; Make a file of 255 bytes values
For lp=0 To 255
WriteByte 1,lp
Next
; Close this file channel
CloseFile 1
Print "============================"
Print "Reading File:"+File$
Print "============================"
; Get the Size of this file in bytes
Size=FileSize(File$)
; Open a file to READ with READFILE
ReadFile File$,1
; Set the current File Pointer Position in
; File channel 1 To start at byte 100 into
; this file
FilePos 1,100
; Read 10 bytes from this position
For lp=1 To 10
; Read and display this byte
Print " Byte Data:"+Str$(ReadByte(1))
Next
; Display the Current File Pointer Position
Print "File Pointer Position:"+Str$(GetFilePos(1))
; Close this file channel
CloseFile 1
If FileExist(file$) Then DeleteFile file$
; Display the screen and wait for a key press
Sync
WaitKey
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This example would output.
============================
Reading File: C:\Windows\Temp\Pb_TestFile.txt
============================
Byte Data:100
Byte Data:101
Byte Data:102
Byte Data:103
Byte Data:104
Byte Data:105
Byte Data:106
Byte Data:107
Byte Data:108
Byte Data:109
File Pointer Position:110
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