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software
software
software
In this lesson we are going to create a Display and an Input Array.

VENTAS VDC Display Array

First of all we create a new file like “array.per” with the new screen form:

DATABASE FORMONLY

LAYOUT

VBOX
TABLE
{

[id | name | age ]
[id | name | age ]
[id | name | age ]
[id | name | age ]
[id | name | age ]
}
END
END

ATTRIBUTES

id = FORMONLY.id, TEXT=”Id”;
name = FORMONLY.name, TEXT=”Name”;
age = FORMONLY.age, TEXT=”Age”;

INSTRUCTIONS
DELIMITERS “||”

SCREEN RECORD s_arr[5](FORMONLY.id THRU FORMONLY.age)

With “VBOX” we create a vertical align table to display our ARRAY vertically. The screen record is needed to declare how many rows your array has and from which column to the next column it has go. [5] is the rows of our ARRAY.

Compile it with “fcompile -xml array.per”

Then we create our window. Create a new file such as “array.4gl”.

MAIN
   DEFINE string STRING

   CLOSE WINDOW screen
   CALL ui.Interface.loadActionDefaults(”default”)
   CALL ui.Interface.LoadStyles(”default”)

   OPEN WINDOW array WITH FORM “m_array”
   CALL ui.Interface.setText(”Display Array”)

   MENU “Navigation”
      COMMAND “Ok”
         CALL dialog(string)
      COMMAND “Search”
         CALL displ_arr() RETURNING string
      COMMAND “Insert”
         CALL insert_arr()
      COMMAND “Exit”
         EXIT MENU
   END MENU
END MAIN

FUNCTION insert_arr()
   DEFINE sc_arr ARRAY[500] OF RECORD
            id INTEGER,
            name CHAR(255),
            age INTEGER
            END RECORD

   INPUT ARRAY sc_arr FROM s_arr.*
      BEFORE INPUT
         MESSAGE “BEFORE INPUT. Please fill the form fields.”

      BEFORE FIELD id
      AFTER FIELD id
         MESSAGE “Id have beed changed on row “||ARR_CURR()||”.”

      BEFORE FIELD name
      AFTER FIELD name
         MESSAGE “Name has been changed on row “||ARR_CURR()||”.”

      BEFORE FIELD age
      AFTER FIELD age
         MESSAGE “Age has been changed on row “||ARR_CURR()||”.”

      AFTER ROW

      ON KEY (F5)
         MESSAGE “This is the ON KEY action”

      AFTER INPUT
         MESSAGE “End of the ARRAY INPUT”
      END INPUT

END FUNCTION

FUNCTION displ_arr()
   DEFINE sc_arr ARRAY[500] OF RECORD
            id INTEGER,
            name CHAR(255),
            age INTEGER
            END RECORD
   DEFINE string STRING

   LET sc_arr[1].id = “1″
   LET sc_arr[1].name = “Max”
   LET sc_arr[1].age = “32″

   LET sc_arr[2].id = “2″
   LET sc_arr[2].name = “Mustermann”
   LET sc_arr[2].age = “12″

   LET sc_arr[3].id = “3″
   LET sc_arr[3].name = “Jorden”
   LET sc_arr[3].age = “34″

   LET sc_arr[4].id = “4″
   LET sc_arr[4].name = “Andre”
   LET sc_arr[4].age = “56″

   LET sc_arr[5].id = “5″
   LET sc_arr[5].name = “Mike”
   LET sc_arr[5].age = “82″

   CALL SET_COUNT(5)
   DISPLAY ARRAY sc_arr TO s_arr.*

   BEFORE ROW
      MESSAGE “Please select a row”
   AFTER ROW

   ON KEY (F3)
      MESSAGE “You have selected row number: “||ARR_CURR()||”.”

   AFTER DISPLAY
      MESSAGE “Your last row was: “||ARR_CURR()||”.”

   END DISPLAY
   LET string = “You have selected the line: “, sc_arr[ARR_CURR()].id CLIPPED, “\nand name: “, sc_arr[ARR_CURR()].name CLIPPED
      RETURN string
END FUNCTION

FUNCTION dialog(string)
   DEFINE string STRING
   IF string IS NULL
      THEN LET string = “You have nothing selected”
   END IF

   MENU “title”
            ATTRIBUTE (STYLE=”dialog”,
            COMMENT = string CLIPPED)
      COMMAND “Ok”
         EXIT MENU
   END MENU

END FUNCTION

Compile this example with “4glpc array.4gl -o array.4ae”.

We must define how many rows we want to display in our DISPLAY ARRAY by using SET_COUNT(). In our function “displ_arr()” we create the program array and fill them with content e.g 5 rows and 3 columns. And then we send it to the screen array from the program array with “DISPLAY ARRAY program array TO screen array”.

With the function insert_arr() we have made your screen array editable.