/*
def var xx as char.

load 'Test' base ''HKEY_CURRENT_USER' dir '

GET-KEY-VALUE
    SECTION 'Software\Microsoft\Windows NT\CurrentVersion\Windows"'
    KEY     'Device'
    VALUE   xx.
    
    message xx view-as alert-box.
*/
{windows.i}
 
DEFINE VARIABLE list-of-printers AS CHARACTER.
DEFINE VARIABLE newdefault AS CHARACTER.
DEFINE VARIABLE driver-and-port AS CHARACTER.
 
RUN getkey
  (INPUT  "devices",    /* The section name */
   INPUT  "",           /* The key name  */
   INPUT  "win.ini",    /* Name of ini file */
   OUTPUT list-of-printers).     /* Returned stuff */

message list-of-printers view-as alert-box. 
/* you now have a comma separated list of printer names. Check it: */
/* message list-of-printers view-as alert-box. */
/* allow the user to pick one, suppose he picks the third entry: */
 
newdefault = ENTRY(2, list-of-printers).
 
/* read driver and port for the new default printer */
RUN getkey
  (INPUT  "devices",        /* The section name */
   INPUT  newdefault,       /* The key name  */
   INPUT  "win.ini",        /* Name of ini file */
   OUTPUT driver-and-port). /* Returned stuff */
 
/* and write it back */
RUN putkey 
  (INPUT "windows",
   INPUT "device",
   INPUT "win.ini",
   INPUT newdefault + "," + driver-and-port).
 
/* check it: 
message session:printer-name view-as alert-box.
*/
 
RETURN.
 
/* ------------- internal procedures ------------ */
 
PROCEDURE getkey :
 
DEFINE INPUT PARAMETER i-section AS CHARACTER.
DEFINE INPUT PARAMETER i-key AS CHARACTER.
DEFINE INPUT PARAMETER i-filename AS CHARACTER.
DEFINE OUTPUT PARAMETER o-value AS CHARACTER.
 
DEFINE VARIABLE EntryPointer AS INTEGER NO-UNDO.
DEFINE VARIABLE mem1 AS MEMPTR NO-UNDO.
DEFINE VARIABLE mem2 AS MEMPTR NO-UNDO.
DEFINE VARIABLE mem1size AS INTEGER NO-UNDO.
DEFINE VARIABLE mem2size AS INTEGER NO-UNDO.
DEFINE VARIABLE i       AS INTEGER    NO-UNDO.
DEFINE VARIABLE cbReturnSize  AS INTEGER    NO-UNDO.
 
ASSIGN
  SET-SIZE(mem1)  = 4000
  mem1size = 4000.
 
IF i-key = "" THEN EntryPointer = 0.
 
ELSE DO:
  /* Must fill memory with desired key name and EntryPointer must point to it */
 
  ASSIGN
  SET-SIZE(mem2) = 128
  mem2size = 128
  EntryPointer = GET-POINTER-VALUE(mem2)
  PUT-STRING(mem2,1) = i-key.
END.
 
RUN getprivateprofilestring{&A} IN hpApi
                              (i-section, 
                               EntryPointer, 
                               "",
                               GET-POINTER-VALUE(mem1),
                               INPUT mem1size, 
                               i-filename,
                               OUTPUT cbReturnSize).
 
/* if i-key was "", Windows will return a list of all keys in i-section.
   This list is not comma-separated but separated by CHR(0). Progress
   can not handle that easily so we'll now replace every 0 by a comma: */ 
 
DO i = 1 TO cbReturnSize:
  /* If this is a list convert null character into a comma to generate a csv
     type variable */
  o-value = IF (GET-BYTE(mem1, i) = 0 AND i NE cbReturnSize) 
               THEN o-value + ","
               ELSE o-value + CHR(GET-BYTE(mem1, i)).
END.
 
  SET-SIZE(mem1) = 0.
  SET-SIZE(mem2) = 0.
 
END PROCEDURE.
 
 
PROCEDURE putkey :
DEFINE INPUT PARAMETER i-section AS CHARACTER.
DEFINE INPUT PARAMETER i-key AS CHARACTER.
DEFINE INPUT PARAMETER i-filename AS CHARACTER.
DEFINE INPUT PARAMETER i-value AS CHARACTER.
 
DEFINE VARIABLE cbReturnSize AS INTEGER.
 
RUN writeprivateprofilestring{&A} IN hpApi
                               (i-section, 
                                i-key, 
                                i-value,
                                i-filename, 
                                OUTPUT cbReturnSize ).
 
END PROCEDURE.