Re: using lParam if it's a pointer
- From: "Littlefield, Tyler" <tyler@xxxxxxxxxxxxx>
- To: <programmingblind@xxxxxxxxxxxxx>
- Date: Tue, 11 Dec 2007 20:35:13 -0700
thanks. will do.
Also. one last question.
If I have a struct like:
struct data{
int a,b,c,d,e,f,g;
};
will it order it in memory with a being first, g being last? I'm working on a
program that requires me to have an int size, and then read the first 4 bytes
to know how big the struct is.
Thanks,
Tyler Littlefield
Vertigo head coder.
"I can only please one person per day; Today doesn't seem like your day, and
tomorrow doesn't look to promising either."
"A life? Where can I download that at?"
Contact information:
email: tyler@xxxxxxxxxxxxx
skype: st8amnd127
aim: st8amnd2005
msn: tyler@xxxxxxxxxxxxx
----- Original Message -----
From: Will Pearson
To: programmingblind@xxxxxxxxxxxxx
Sent: Tuesday, December 11, 2007 4:56 PM
Subject: Re: using lParam if it's a pointer
Hi Tyler,
I suspect you will need to cast the lParam value. If you don't then the
compiler won't know that you are dealing with a structure and you will likely
get some compile errors. As the structure is a user defined data type then
there are likely no standard conversions.
Without a conversion the compiler will asumme that you are just dealing with
an unsigned 32-bit integer. LPARAM's is a typedef for LONG_PTR, and LONG_PTR
is in turn a typedef for long. As 32-bit unsigned numeric values don't have
members then tge compiler is likely to trow some compile errors.
Will
----- Original Message -----
From: Littlefield, Tyler
To: programmingblind@xxxxxxxxxxxxx
Sent: Tuesday, December 11, 2007 11:18 PM
Subject: Re: using lParam if it's a pointer
it says it's a pointer to a struct. I just want to get the data at like
lParam->foo;
Tyler Littlefield
Vertigo head coder.
"I can only please one person per day; Today doesn't seem like your day,
and tomorrow doesn't look to promising either."
"A life? Where can I download that at?"
Contact information:
email: tyler@xxxxxxxxxxxxx
skype: st8amnd127
aim: st8amnd2005
msn: tyler@xxxxxxxxxxxxx
----- Original Message -----
From: Ken Perry
To: programmingblind@xxxxxxxxxxxxx
Sent: Tuesday, December 11, 2007 7:30 AM
Subject: RE: using lParam if it's a pointer
This depends if your doing it in c++ or C but truthfully it probably
doesn't matter you should be able to do it with out a cast but it would give
you a warning it really depends on what your doing with it.
Ken
--------------------------------------------------------------------------
From: programmingblind-bounce@xxxxxxxxxxxxx
[mailto:programmingblind-bounce@xxxxxxxxxxxxx] On Behalf Of Littlefield, Tyler
Sent: Tuesday, December 11, 2007 5:27 AM
To: programmingblind@xxxxxxxxxxxxx
Subject: using lParam if it's a pointer
Hello list,
I've got a question.
I'm using a callback function, and lParam contains a pointer to a struct
of data.
I'm using like lParam->bla=32; do I need to cast lParam to the struct
first? (struct)lParam->bla=32;
Thanks,
Tyler Littlefield
Vertigo head coder.
"I can only please one person per day; Today doesn't seem like your day,
and tomorrow doesn't look to promising either."
"A life? Where can I download that at?"
Contact information:
email: tyler@xxxxxxxxxxxxx
skype: st8amnd127
aim: st8amnd2005
msn: tyler@xxxxxxxxxxxxx
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