Creating Windows FCLOSE Instruction FCLOSE closes a window to input and output (but does not erase it or remove it from memory). The syntax for FCLOSE is: FCLOSE (glun) glun The logical unit number specified in the FOPEN instruction that opened the window. FDELETE Instruction FDELETE removes a closed, attached window from the screen and from graphics memory. The syntax for FDELETE is FDELETE (glun) "window_name" glun The same values as specified in the FOPEN instruction that created the window. DETACH Instruction DETACH frees up a LUN for use by a subsequent ATTACH instruction. The syntax for DETACH is: DETACH (glun) glun The LUN specified in a previous ATTACH instruction.
Custom Window Example This section of code will create and delete a window: AUTO glun ; Graphics window LUN ATTACH (glun, 4) "GRAPHICS" ; Attach to a window LUN ; Open the window "Test" with a maximum size of ; 400 x 300 pixels FOPEN(glun) "Test","/MAXSIZE 400 300" ; Your code for processing within the window ; goes here; e.g: GTYPE (glun) 10, 10, "Hello!" ; When the window is no longer needed, close and delete the ; window and detach from the logical unit FCLOSE (glun) eV+Language User's Guide, v2.x, 18318-000 Rev A Page 163