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 Printed May 2, 2024, 3:27 am This article has been viewed/printed 35116 times. |