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Home > Forums > Programmers > Languages > BASIC: Microsoft Forum

QBASIC FOR and POKE

thread204-1643484
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Roltsuuu (TechnicalUser)
30 Mar 11 9:45
Can someone explain me this ?
I have to know what those lines are doing :(.
I know already that it's something with video memory, and this

CODE

  POKE (i% - 1) * 160 + j% + 1, 128 + 14
is changing text and backgroud color, also &HB800 is something with video ram?
But what does

CODE

FOR j% = 0 TO 158 STEP 2
  POKE (i% - 1) * 160 + j%, ASC(MID$(rida(i%), j% / 2 + 1, 1))
those lines do.
And if someone help, thanks to him.


CODE

DEF SEG = &HB800
FOR i% = 1 TO 20
 FOR j% = 0 TO 158 STEP 2
  POKE (i% - 1) * 160 + j%, ASC(MID$(rida(i%), j% / 2 + 1, 1))
  POKE (i% - 1) * 160 + j% + 1, 128 + 14
 NEXT j%
NEXT i%
END
jknichols (TechnicalUser)
30 Mar 11 14:25
It should be obvious that rida() is an array of strings - 20 strings of 80 characters each. Yeah, right, I spent all morning Google-ing variations of BASIC and rida trying to figure out what the rida function did.

At any rate, this code snippet is pulling 20 line of 80 characters out of the array, applying the 0x8e color attribute to each, and poking it directly into the display memory. Note that there doesn't appear to be any error checking to make sure that the array has 20 strings, nor that each string has 80 characters.  
jknichols (TechnicalUser)
17 Aug 11 12:27
<BUMP>

Was I correct (or even close)???
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