1. RE: c structs
Thanks Derek,
Now I understand that much.
What about arrays? and fixed length strings?
EG.
recName1(1) As Byte
recName2 As String * 14
Chris
Derek Parnell wrote:
> Try this:
>
>
> include tk_mem.e
>
> -- Type POINT
> ptX = allot( Long ),
> ptY = allot( Long ),
> SIZEOF_POINT = allotted_size(),
>
> -- Type MSG
> msgHWnd = allot( Long ),
> msgMessage = allot( UInt ),
> msgWParam = allot( Long ),
> msgLParam = allot( Long ),
> msgTime = allot( DWord ),
> msgPtX = allot( Long ),
> msgPtY = allot( Long ),
> SIZEOF_MSG = allotted_size()
>
>
> You can then do something like:
>
> atom hPoint
>
> hPoint = acquire_mem(0, SIZEOF_POINT)
> store(hPoint, ptX, xvalue)
> store(hPoint, ptY, yvalue)
>
> and
>
> xvalue = fetch(hPoint, ptX)
> yvalue = fetch(hPoint, ptY)
>
>
> Unless you want to use the low-level access methods:
>
>
> -- Type POINT
> contant
> ptX = 0,
> ptY = 4,
> SIZEOF_POINT = 8,
>
> -- Type MSG
> msgHWnd = 0,
> msgMessage = 4,
> msgWParam = 8,
> msgLParam = 12,
> msgTime = 16,
> msgPtX = 20,
> msgPtY = 24,
> SIZEOF_MSG = 28
>
>
> You can then do something like:
>
> atom hPoint
>
> hPoint = allocate(SIZEOF_POINT)
> poke4(hPoint + ptX, xvalue)
> poke4(hPoint + ptY, yvalue)
>
> and
>
> xvalue = peek4s(hPoint+ptX)
> yvalue = peek4s(hPoint+ptY)
>
> -----------
> Derek.
>
> ----- Original Message -----
> From: "Chris Bensler" <bensler at mail.com>
> To: "EUforum" <EUforum at topica.com>
> Sent: Friday, March 29, 2002 11:28 PM
> Subject: c structs
>
>
> > I'm trying to convert some structures to eu, and I'm not sure of how
> > some things are stored.
> >
> > for example, here are some VB type declares:
> >
> > Type POINTAPI
> > x As Long
> > y As Long
> > End Type
> >
> > Type MSG
> > hwnd As Long
> > message As Long
> > wParam As Long
> > lParam As Long
> > time As Long
> > pt As POINTAPI
> > End Type
> >
> > what would the struct size and offsets be? does a struct use any bytes
<snip>
