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Johnny
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Joined: 19 Feb 2005
Posts: 5
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 Posted: Sat Feb 26, 2005 3:24 pm Post subject: Question about NULL in API |
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I would like to ask how I can pass a NULL as parameter to API functions?
Is there something in VDS like vbNullString in VB, that can be passed to API functions?
I have tried leaving the parameter blank (as a VDS null), but when i run it the VDS IDE just close itself... 
Last edited by Johnny on Sat Feb 26, 2005 3:36 pm; edited 1 time in total |
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Mac
Professional Member
Joined: 08 Jul 2000
Posts: 1585
Location: Oklahoma USA
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| Posted: Sat Feb 26, 2005 3:33 pm Post subject: |
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Passing zero should work. 
Cheers, Mac 
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Skit3000
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Location: The Netherlands
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Johnny
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Joined: 19 Feb 2005
Posts: 5
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| Posted: Sat Feb 26, 2005 3:38 pm Post subject: |
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| Mac wrote: | Passing zero should work.
Cheers, Mac |
I will try on it~ Thanks~ |
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Johnny
Newbie
Joined: 19 Feb 2005
Posts: 5
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| Posted: Sat Feb 26, 2005 3:40 pm Post subject: |
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| Skit3000 wrote: | You can also use "NIL:" as a parameter...
| Code: | | @lib(user32.dll,FunctionName,INT:,STR:Hello world!,NIL:,INT:53542) |
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o really? this will be very useful.
Thanks very much~ |
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ShinobiSoft
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Joined: 06 Nov 2002
Posts: 790
Location: Knoxville, Tn
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| Posted: Sat Feb 26, 2005 4:23 pm Post subject: |
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Technically zero (0) is not how NULL is defined. Look at the ASCII codes.
ASCII for 0(zero) is 48
ASCII for NULL is 0
Basically what I'm saying is pass @chr(0) instead of just 0.
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Bill Weckel
ShinobiSoft Software
"The way is known to all, but not all know it." |
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Mac
Professional Member
Joined: 08 Jul 2000
Posts: 1585
Location: Oklahoma USA
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| Posted: Sat Feb 26, 2005 6:52 pm Post subject: |
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| bweckel wrote: |
Technically zero (0) is not how NULL is defined.
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True - but to my knowledge, any API function will accept zero
when a NULL parameter is required.
Cheers, Mac
_________________
VDSug.dll does file IO, check/disable menu items,
non-VDS dlls, draw functions and more...
Free download (30k dll size) at:
http://www.vdsworld.com/download.php?id=361
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ShinobiSoft
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Joined: 06 Nov 2002
Posts: 790
Location: Knoxville, Tn
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| Posted: Sat Feb 26, 2005 9:19 pm Post subject: |
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| Mac wrote: |
True - but to my knowledge, any API function will accept zero
when a NULL parameter is required.
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Touche!?
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Bill Weckel
ShinobiSoft Software
"The way is known to all, but not all know it." |
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jules
Professional Member
Joined: 14 Sep 2001
Posts: 1043
Location: Cumbria, UK
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| Posted: Mon Feb 28, 2005 9:47 am Post subject: |
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| Mac wrote: | | bweckel wrote: |
Technically zero (0) is not how NULL is defined.
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True - but to my knowledge, any API function will accept zero
when a NULL parameter is required.
Cheers, Mac |
Correct. Only fussy type-safe languages will raise an objection to it.
The VDS @lib function will see that 0 is a number, and therefore pass it as a 32-bit binary value. To pass the character '0' you would have to put STR:0.
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