ReadValue# - Learn To Code - PlayBASIC Documentation

ReadValue#

FloatValue# = ReadValue#(ChannelIndex)

Parameters:

ChannelIndex = Index of the file channel to read from

Returns:

FloatValue# = The float value that has been read from this file

The ReadValue# function will read the next line of text from an open file channel and return it as a Floating point value.

ReadValue# is short hand for the following Result#= Val(ReadString$(1))

FACTS:

* ReadValue# only works with files opened with ReadFile command.

Mini Tutorial:

This example creates a simple file with some various bits of data store in it, then read it's back again.

; Create file name
  File$=TempDir$()+"PB_TestFile.txt"

; CReate a File for writing data to
  WriteFile File$,1

; Write a String of the Integer value 5000
  WriteString 1,"5000"

; Write a String of the Float Value 33.33
  WriteString 1,"33.33"

; Close this file channel
  CloseFile 1


  Print "============================"
  Print "Reading File:"+File$
  Print "============================"


; Open a file to READ with READFILE
  ReadFile File$,1

; Read and display the String value and a integer + 100
  ThisInteger=ReadValue(1)
  Print "  Integer Data:"+Str$(ThisInteger+100)

; Read and display the String value as a float + 100
  ThisFloat#=ReadValue#(1)
  Print "  Float Data:"+Str$(ThisFloat#+100)

; Close this file channel
  CloseFile 1


  If FileExist(file$) Then DeleteFile file$

; Display the screen and wait for a key press
  Sync
  WaitKey

This example would output.

  ============================
  Reading File:C:Windows\temp\Pb_TestFile.txt
  ============================
  Integer Data:5100
  Float Data:133.33


Related Info:	CloseFile \| ReadByte \| ReadChr$ \| ReadFile \| ReadFloat \| ReadInt \| ReadString$ \| ReadValue \| ReadWord :