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Don't forget the star.md

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Don't forget the star

Many 4D commands use the char * as parameter.

  1. The most common use is to use a widget name instead of a variable reference into a form.

    If you pass the optional * parameter, this indicates that the object parameter is an object name (a character string). If you do not pass the * parameter, this indicates that object is a field or a variable. In this case, do not pass a string but rather a field or variable reference (object type only).

    In this case the star is the first parameter of the commands.

  2. For some commands to manage the hierarchical list, the * is used instead of the element reference to work with the currently selected element.

  3. In other cases, the star is used as a comportement modifier of the command.
    In this case, the star is a last optional parameter.

    Here is some samples:

    COMMANDS MODIFIER MEANING Version
    Uppercase
    Lowercase    		 Preserve accented characters
    Position
    Replace string    		 Case sensitive
    GET TEXT KEYWORDS
    GET PICTURE KEYWORDS    		 Only different keyword
    Match regex Only searches at position indicated
    File
    Folder
    Get 4D folder
    Get 4D file
    Structure file    		 Return pathname of host database
    Get database localization
    Is compiled mode    		 Return information about host database
    SET DATABASE LOCALIZATION Only apply to the database where the code is executed
    Current date
    Current time    		 Return value from the server
    FORM Get current page
    FORM GOTO PAGE    		 Applies to the subform
    FORM LOAD Applies to host database when it is executed from a component
    FORM SET INPUT Automatic window size
    FORM SET SIZE See documentation
    CLEAR LIST
    DELETE FROM LIST    		 Clear the sublists too
    Count list items All items in the list (not just the visible ones)
    Find in list
    Selected list items    		 Use reference number
    HTTP AUTHENTICATE Authentication by proxy
    HTTP Get
    HTTP Request    		 Enables the keep-alive mechanism
    EXPORT DATA
    IMPORT DATA    		 Displays the import dialog box and updates the project
    SET TABLE TITLES
    SET FIELD TITLES    		 Use the custom names in the formula editor
    SET ASSERT ENABLED Applies to current process only
    JSON Parse Adds line position and offset of each property
    JSON Stringify
    JSON Stringify array    		 Pretty formatting
    APPEND MENU ITEM
    INSERT MENU ITEM
    SET MENU ITEM    		 Consider metacharacters as standard characters
    SET MENU BAR Save menu bar state
    OBJECT DUPLICATE
    OBJECT MOVE    		 Absolute coordinates
    OBJECT SET SCROLL POSITION Display of line (and column if any) in first position after scroll
    SET FILE TO PASTEBOARD Add instead of replace
    PHP SET OPTION Only applies to next call
    Is picture file Validate data
    PICTURE CODEC LIST Return list of reading (decoding) Codecs instead list of writing (encoding) Codecs
    READ PICTURE FILE Accept any type of file
    Frontmost process Of the first non-floating window
    Frontmost window Of the first floating window
    New process
    Execute on server    		 Unique process
    Process number Return the process number from the server
    REGISTER CLIENT Local process
    QUERY
    QUERY SELECTION
    ORDER BY
    QUERY BY ATTRIBUTE
    QUERY SELECTION BY ATTRIBUTE
    ORDER BY ATTRIBUTE    		 Continue order flag
    QUERY BY EXAMPLE Do not display the scroll bar
    ST FREEZE EXPRESSIONS Update expressions before freezing them
    SVG SET ATTRIBUTE Modify SVG image itself
    Convert path POSIX to system
    Convert path system to POSIX    		 Encoding option
    COPY DOCUMENT Override existing document if any
    CREATE FOLDER Create folder hierarchy
    SHOW ON DISK Show folder contents
    Screen height
    Screen width    		 On Windows, screen instead of MDI window
    GET ACTIVITY SNAPSHOT Server side activity
    OPEN URL
    WEB SEND HTTP REDIRECT    		 Do not encode special characters
    GET MOUSE
    POST CLICK    		 Coordinates relative to the main screen (or MDI window)
    SET FIELD TITLES
    SET TABLE TITLES    		 Use the custom names in the formula editor
    WEB SEND RAW DATA Send chunked
    Open form window Save position and size
    SET WINDOW RECT Do not change window to foreground
    WINDOW LIST With floating windows
    SQL LOGIN Change the target of the SQL code executed within the Begin SQL/End SQL tags
    BASE64 ENCODE
    BASE64 DECODE    		 Use the Base64URL encoding instead of Base64 18R4+
    Generate digest Return the digest encoded in Base64URL form instead of hexadecimal 18R4+