The example package

Contents

Overview



The package example_package provides some components that will be used in the source code examples of the HBasic documentation. This package includes two components:

Nogui
 A component with no visible widget at runtime which only provides a simple interface
XButton
 A button like widget component which is derived from the QT QPushButton

Both components only use a very minimalistic interface to work as simple as possible and may therefore also be used as a template for new packages.

Component Nogui




The following methods may be used with a component of type file:

Open
 Open a file for reading or writing
Close
 Close a file
Eof
 Check if end of file has been reached.
read( long )
 read values in ASCII format from file
readline
 read until end of line has been reached.
write
 Write values as ASCII text to a file
writeline
 Write a string with CR to file
get
 Get a binary value from a file
getstr
 Get String of special length from file
getxstr
 get string from file in extended format
put
 Write binary value to file
putstr
 Write string to file
putxstr
 Write string in extended format to file.



Component XButton





File example


The following example opens a file in write-mode and writes the numbers from 1 to 20 to it.


Public f As file
Public i As Long

Sub button1_clicked()
   f.open( "test.dat", "w" )
   i = 1
   While i < 20 Do
      f.write( "Value = "+str(i))
      i = i + 1
   Wend
   f.close()
End Sub
Example ex_comp_file.bas: Open file and write data to it