WaitVBL in VB5 ???

Posted on 1998-02-18
Last Modified: 2009-07-29
I'm attempting to write a game in Visual Basic 5.
I need to ensure the game play rate is consistent and not too fast. I used to use Blitz Basic 2 on the Amiga and it had a "WaitVBL" command that was used to wait for the screens next complete vertical blank. Is this possible to achieve this with VB 5 ? If not, is it possible to ensure that a game will play at roughly the same speed on (say ) a P133 and a PII 233 ? Obviously, FOR... NEXT loops are not acceptable ;) I notice other games have been written with VB5, so somebody else must have overcome this very problem.
Question by:lbowers
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Expert Comment

ID: 1457394
You can use SLEEP API (see below) to pause things for a desired number of milliseconds.  You can also use DOEVENTS to have windows complete actions in it's queue, to slow down your game.

Declare Sub Sleep Lib "kernel32" Alias "Sleep" (ByVal
dwMilliseconds As Long)


Author Comment

ID: 1457395
Edited text of question

Expert Comment

ID: 1457396
Unfortunately I don't think either Sleep or DoEvents will provide predictable periods.  Generally they provide a delay for a minimum amount of time, but exactly how long after that minimum it variable.
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Author Comment

ID: 1457397
You're right - I've tried using both of the prviously mentioned solutions and they both vary wildly on the actual time they delay for. It looks like it's not going to be possible with delving into Direct X perhaps...

Expert Comment

ID: 1457398
SLEEP API delays for the number of milliseconds you specify.  Nothing more, nothing less.

Author Comment

ID: 1457399

Sorry - You were right. The SLEEP API work perfectly!

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Accepted Solution

anthonyc earned 300 total points
ID: 1457400
You can give me points now!

Author Comment

ID: 1457401
Thanx a million!

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