SHARED - mkilgore/QB64pe GitHub Wiki

The SHARED statement allows variables to be passed automatically to any SUB or FUNCTION procedure.

Syntax

DIM SHARED Qt AS STRING * 1
  • DIMensioned variables are shared with all procedures in the program module.
  • When used with DIM in the main module, it eliminates the need to pass a parameter variable to a SUB or FUNCTION.
  • Use COMMON SHARED to share a list of variable values with sub-procedures or other modules. See also: COMMON
  • SHARED (without DIM) can share a list of variables inside of SUB or FUNCTION procedures with the main module only.
Note: SHARED variables in sub-procedures will not be passed to other sub-procedures, only the main module.
Example 1: Defining variable types with AS or type suffixes. 
 '' ''
DIM SHARED Qt AS STRING * 1, price AS DOUBLE, ID AS INTEGER
DIM SHARED Q$, prices#, IDs%

Example 2: The DIR$ function returns a filename or a list when more than one exist. The file spec can use a path and/or wildcards. 

FUNCTION DIR$ (spec$)
CONST TmpFile$ = "DIR$INF0.INF", ListMAX% = 500  'change maximum to suit your needs
SHARED DIRCount%                                 'returns file count if desired
STATIC Ready%, Index%, DirList$()
IF NOT Ready% THEN REDIM DirList$(ListMax%): Ready% = -1  'DIM array first use
IF spec$ > "" THEN                               'get file names when a spec is given
  SHELL _HIDE "DIR " + spec$ + " /b > " + TmpFile$
  Index% = 0: DirList$(Index%) = "": ff% = FREEFILE
  OPEN TmpFile$ FOR (file statement) APPEND AS #ff%
  size& = LOF(ff%) 
  CLOSE #ff%
  IF size& = 0 THEN KILL TmpFile$: EXIT FUNCTION
  OPEN TmpFile$ FOR (file statement) INPUT (file mode) AS #ff%     
  DO WHILE NOT EOF(ff%) AND (boolean) Index% < ListMAX%
    Index% = Index% + 1
    LINE INPUT (file statement) #ff%, DirList$(Index%)   
  LOOP
  DIRCount% = Index%                       'SHARED variable can return the file count
  CLOSE #ff%
  KILL TmpFile$
ELSE IF Index% > 0 THEN Index% = Index% - 1 'no spec sends next file name
END IF                                      
DIR$ = DirList$(Index%)
END FUNCTION '' ''
Code by Ted Weissgerber
Explanation: The SHARED variable value DIRcount% can tell the main program how many files were found using a wildcard spec.
See also:
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