Tutorial 6

• List Box control
• AddItem method
• {Listboxname}.AddItem  “somestring” or strVariable
• Sorted Property (TRUE or FALSE)
• Determines if listbox sorted by Item
• ListIndex Property
• Index(0 Based) of selected item in list box
• Sequential Files

o      Opening a file

§        Open <strPathName> for <mode> as # <fileNumber>

·        StrPathName – absolute or relative path of file to be opened

o       “C:\temp\test.txt”

o       “test.txt” looks for file in current directory

o       strFileName -  string variable that contains fileName

·        mode

o       Input – read data from file

·        If file does not exist VB throws an error

o       Use on error to catch

§        ON ERROR GOTO FILERROR

§        :FILERROR

o       Output – write data to file, overwriting current data

o       Append – adds data to end of file

§        File created if it does not exist

o      Writing to a sequential file

§        Write # filenumber , <variable>

o      Closing a file

§        Close #filenumber

o      EOF function

§        eof(filenumber) – return true if end of file reached on read(nothing more to read)

o      Read a record

§        Input # fileNumber, <variables>

·        Printing

o      Printer.print <string to print>

§        ; - hold print position

§        , next tab position

§        examples

·        printer.print “LastName”, 123;

§        spc(#) – adds number of space inside () to print stream

§        tab(10) – moves to print position 10

o      printer.font

§        property that controls font type

·        printer.font  = “courier new”

o       courier new is fixed space font(monospaced)

·        printer.font  = “ms sans serif”           

o       proportional

o      printer.fontsize

§        point size of printer text

Menus

• Menu control
• Choose menu button  or Tools, Menu editor
• Caption – text that shows on menu
• Name – used to reference menu item in VB code
• Use left arrow to create sub menu
• Use & to give access key to menu
• -  in Caption box creates separator bar
• Clipboard
• SetText – send text to clipboard
• GeText() – gets text from clipboard
• Clear – clears clipboard

String Manipulation

• Left (string,length)             returns leftmost length characters
• Right(string,length)                         returns right most length characters
• Mid(string,start[,length])            returns length characters starting at start
• Instr(start,str1,str2,compare)
• Start             starting position for search
• Str1            string being searched
• Str2            string being sought
• Compare
• 0 – case sensitive
• 1 – case insensitive