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Windows API: Assigning address to reference 2006-02-19 -- Jim Kane > Hi all. I have an address of a cstring in a ULONG variable. How can I
> make a &CSTRING reference point at that address?
>
> I can't do cstrref &= myulong because the type doesn't match. I'd use
> cstrref &= address(myulong) but that's not right. I tried doing
> tmpulongRef &= mylong; cstrref &= address(tmpulongRef) but that doesn't do
> it either.
Check the help for reference variables. It will clearly tell you can't.
Also note the use of ( ) to force a cast and avoid type problems.
cref &= (myulong)
Will point at it but the size will be considered zero which will screw
things up for some commands where the runtime needs the cstring size and
work just fine for other things.
If you want to rely on the undocumented inner workings of c string ref
variables you can do what you want to.
Usually a bad idea when there are api c string functions to manipulate
cstring.
Here's enough rope to hang yourself - code will break if SV changes the
internal structure of a cstring ref variable.
Jim kane
program
map
end
crefGroup group,pre()
cRef &cstring
end
crefgroupOver group, over(crefgroup)
Theaddress long
thesize long
end
cVar cstring(200)
myulong ulong
sizeofcstring long
code
!a cstring to test with
cVar = 'cref Test'
!make the ref variable point to cVar
myulong = address( cVar )
sizeOfcstring = size( cvar) crefgroupover.theaddress = myulong
crefgroupover.thesize = sizeofcstring
!see if it worked
message( cref )
return
Today is April 18, 2024, 5:53 pm This article has been viewed 35110 times.
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