Redim an array in MSX basic

Master (158)

29-08-2020, 20:30

Hi,

I'm trying to create a simple file browser to select and open a file for reading.
I found the example to read the file names from disk from NYYRIKKI.
https://www.msx.org/forum/development/msx-development/displa...
It works great, thanks NYYRIKKI! :)

The number of files is variable so I have to use a dynamic array or work around.
Is it possible to redim an array in MSX basic?

By smart duck

Master (158)

29-08-2020, 21:39

Here is an example/test of what i'm trying.

10 COLOR 14,1,1 : SCREEN 2
20 OPEN "grp:" FOR OUTPUT AS#1
30 DIM FA$(15)
40 DEFINT I:DEFINT U:DEFINT P:C=0
50 FM$="????????.???"
60 DA$="0E11110E12C51100C10E1ACD7DF3C11180C0CD7DF332F8F7C9"
70 AD=&HC080:POKE AD,0'Drive: 0=Default, 1=A: 2=B: ... 8=H
80 FOR I=1 TO 12:AD=AD-(I<>10):POKE AD,ASC(MID$(FM$,I,1)): NEXT I
90 FOR I=&HC08C TO &HC0C0: POKE I,0:NEXT I
100 FOR I=0 TO 25:POKE &HC000+I,VAL("&H"+MID$(DA$,I*2+1,2)):NEXT I
110 DEFUSR=&HC000:DEFUSR1=&HC003
120 IF USR(0)>0 THEN END
130 F$=""
140 FOR I=1 TO 12:F$=F$+CHR$(PEEK(&HC100+I))
150 IF I=8 THEN F$=F$+"."
160 NEXT I: FA$(C) = F$: C=C+1
170 IF USR1(0)=0 THEN 130
180 LINE (64,64)-(192,142),14,BF
190 P=0 : U = 0
200 LINE (65,65)-(191,141),1,BF
210 FOR I=0 TO 5
220 PSET (86,76 + (I*10)),1 : PRINT#1, FA$(I+P)
230 NEXT I
240 PSET(76,76+(U*10)),1 : PRINT #1, ">"
250 K$=INKEY$
260 IF K$="" GOTO 250
270 LINE(76,76 + (U*10))-(85, 86+(U*10)),1,BF
280 IF K$=CHR$(30) THEN U=U-1
290 IF K$=CHR$(31) THEN U=U+1
300 IF K$=CHR$(27) GOTO 380
310 V=P
320 IF U>5 THEN U=5 : P=P+1
330 IF U<0 THEN U=0 : P=P-1
340 IF P>14 THEN P=14
350 IF P<0 THEN P=0
360 IF V<>P THEN V=P : GOTO 200
370 GOTO 240
380 CLOSE #1
390 COLOR 15,4,4:END

By mohai

Paragon (1031)

29-08-2020, 23:52

Just an idea: do a DIM to a different variable, after new dimension is found out, then chnage the pointers with VARPTR.

By smart duck

Master (158)

30-08-2020, 00:38

Thanks for the tip! I will check it out.