Unhandle Memory Exception on Win98

BlitzMax Forums/BlitzMax Programming/Unhandle Memory Exception on Win98

Grey Alien

(Posted 2006) [#1]

Any idea why this code, which runs fine on XP, doesn't run on my son's Win98SE PC? He has DirectX 9, a non-3D video card because it's a 166MHz Packard Bell with 64Mb RAM! My Blitz Plus apps run fine. Is it just the video card must be Direct X 7 compatible? If so it would be nice if Max gave a nice error message for users like, "sorry you need upgrade your video card" etc.

Graphics 800,600,16
Cls
DrawText "hello",0,0
Flip
WaitKey

you download the .exe from here: www.greyaliengames.com/misc/ba.zip (558k)

I compiled with debug off and also with Build GUI App off (what does that do anyway?)

Any ideas what's wrong? If anyone else has Win98 can they please test.

Yan	(Posted 2006) [#2]

a non-3D video card

I think you answered your own question.

I agree about the error message.

[edit]
I'd of thought a check with GraphicsModeExists() would return false though and CountGraphicsModes() also?
[/edit]

Grey Alien

(Posted 2006) [#3]

It's a bit odd for sure. In fact the original program I tried on the PC DID call GraphicsModeExists like this:

			'Try 32 bit, failing that try 16 bit, failing that use windowed mode
			If GraphicsModeExists(ScreenWidth, ScreenHeight,32,60)
				Graphics ScreenWidth, ScreenHeight,32,60
			ElseIf GraphicsModeExists(ScreenWidth, ScreenHeight,16,60)
				Graphics (ScreenWidth,ScreenHeight,16,60)	
			Else
				ForceWindowedMode = 1
				FullScreen = 0
				'Code will continue after EndIf and call Graphics in windowed mode
			EndIf
		EndIf
		'No else on purpose
		If FullScreen = 0 Then
			Graphics (ScreenWidth,ScreenHeight,0)	
		EndIf

Anyway, I've just changed the video card to a 1997 Matrox, we'll see if that fares any better.

Yan	(Posted 2006) [#4]

You not checking the windowed mode. How about...

If GraphicsModeExists(ScreenWidth, ScreenHeight,32,60)
  Graphics ScreenWidth, ScreenHeight,32,60
ElseIf GraphicsModeExists(ScreenWidth, ScreenHeight,16,60)
  Graphics(ScreenWidth,ScreenHeight,16,60)	
Elseif Graphics (ScreenWidth,ScreenHeight,0)
  ForceWindowedMode = 1
  FullScreen = 0
Else
  Runtimeerror "No 3D Hardware Found"	
EndIf

Or a simple...

If Not(CountGraphicsModes()) then Runtimeerror "No 3D Hardware Found"

...At the top of the program?

I'm shooting in the dark a bit here, I'm afraid, as I can't test any of this. :o/

Grey Alien

(Posted 2006) [#5]

yeah and I've gone and changed the video card now haha. I'll put the code in anyway.