1. Poke-ing memory allocated through Windows function
- Posted by Jonas Temple <jtemple at yhti.net>
Feb 17, 2006
-
Last edited Feb 18, 2006
All,
Well, I fixed the code section I posted earlier to put HTML formatted text to
the clipboard. No more memory problems so far (I'll post the updated code for
any who are interested).
What I'm curious about is: I thought Euphoria would not poke() to an address if
it wasn't allocated through allocate(). In my clipboard code I had to use
Window's GlobalAlloc to allocate the memory and then I wondered how to poke the
data, either through another Windows function or poke(). I tried poke() and it
worked.
Can anyone clear this up for me?
Jonas Temple
http://www.yhti.net/~jktemple
2. Re: Poke-ing memory allocated through Windows function
- Posted by Jason Gade <jaygade at yahoo.com>
Feb 17, 2006
-
Last edited Feb 18, 2006
Jonas Temple wrote:
>
> All,
>
> Well, I fixed the code section I posted earlier to put HTML formatted text to
> the clipboard. No more memory problems so far (I'll post the updated code for
> any who are interested).
>
> What I'm curious about is: I thought Euphoria would not poke() to an address
> if it wasn't allocated through allocate(). In my clipboard code I had to use
> Window's GlobalAlloc to allocate the memory and then I wondered how to poke
> the data, either through another Windows function or poke(). I tried poke()
> and it worked.
>
> Can anyone clear this up for me?
>
> Jonas Temple
> <a href="http://www.yhti.net/~jktemple">http://www.yhti.net/~jktemple</a>
If you are using safe.e instead of machine.e, you have to register any blocks
not returned by allocate(). Using the normal machine.e Euphoria will let you poke
anywhere, but if the address you use doesn't belong to your application then
Linux or Windows will give you a segmentation fault/access violation.
See: http://www.rapideuphoria.com/lib_p_r.htm#register_block
--
"Any programming problem can be solved by adding a level of indirection."
--anonymous
"Any performance problem can be solved by removing a level of indirection."
--M. Haertel
"Premature optimization is the root of all evil in programming."
--C.A.R. Hoare
j.
3. Re: Poke-ing memory allocated through Windows function
- Posted by Bernie Ryan <xotron at bluefrog.com>
Feb 17, 2006
-
Last edited Feb 18, 2006
Jonas Temple wrote:
>
> All,
>
> Well, I fixed the code section I posted earlier to put HTML formatted text to
> the clipboard. No more memory problems so far (I'll post the updated code for
> any who are interested).
>
> What I'm curious about is: I thought Euphoria would not poke() to an address
> if it wasn't allocated through allocate(). In my clipboard code I had to use
> Window's GlobalAlloc to allocate the memory and then I wondered how to poke
> the data, either through another Windows function or poke(). I tried poke()
> and it worked.
>
> Can anyone clear this up for me?
>
> Jonas Temple
> <a href="http://www.yhti.net/~jktemple">http://www.yhti.net/~jktemple</a>
You can poke in any memory that is owned by your program.
When you used GlobalAlloc() you requested that the OS
assign some memory to your program therefore you can
poke in that allocated memory. The only thing I think
that you will need to be careful of is to release that
memory with the proper OS function because I don't think
Euphoria will do that for you. Euphoria manages it own memory
off the heap memory and releases it when Euphoria ends.
Bernie
My files in archive:
WMOTOR, XMOTOR, W32ENGIN, MIXEDLIB, EU_ENGIN, WIN32ERU, W32API
Can be downloaded here:
http://www.rapideuphoria.com/cgi-bin/asearch.exu?dos=on&win=on&lnx=on&gen=on&keywords=bernie+ryan
4. Re: Poke-ing memory allocated through Windows function
Hi Jonas,
here the way to use global memory for clipboard usage
-- code sample
atom hGlobal, pData
-- allocate global memory with flags required by clipboard
hGlobal = GlobalAlloc(32,GMEM_MOVEABLE)
-- lock it to ensure the system don't move it while your program is accessing
it.
pData = GlobalLock(hGlobal)
poke(pData,"hello world"&0)
GlobalUnlock(hGlobal)
SetClipboardData(CF_TEXT,hGlobal)
.
.
.
GlobalFree(hGlobal) -- free it with that function when no more needed.
regards,
Jacques Deschênes
