1. David Win32lib
David
How come the create function in windows does not pass all 12 parameters
in the win32lib. This is going to come back to haunt you.
If you want to impliment new advance features in the library that use
these extra parameters then you have to go around the Create function with
the CreateWindow function that you have made non-standard by remapping it
to the CreateWindowExA ( I understand that they are the same except for
the extended styles ) but this is going to confuse users when they try
to use library functions using some code from a windows book. The next
problem if you can't use the create function then the user has to write
all the message handling routines because if you use CreateWindow
function then you can't use onEvent. This means that there can't be
any connection between a window defined with Create and a window defined
with CreateWindow without alot of extra coding.
Bernie
2. Re: David Win32lib
Bernie Ryan wrote (with minor editing):
> How come the create() function in Win32Lib does not
> pass all 12 parameters to CreateWindow?
There are a couple of reasons:
1. Win32Lib is a simplication of the Win32 API.
By definition, some information will be lost
in that process.
2. Win32Lib does not attempt to wrap everything
in the Win32 API. Unlike Llama, it was not
built to be extensible by the user.
3. Some parameters, like the menu handle, simply
don't make sense to use.
4. I'd never had the need to use some parameters,
like extended style. If I had the need, I could
always change the code (see below).
5. Some parameters, like the program instance
handle, I never really understood that well.
> If you want to implement new advanced features
> in the library that use these extra parameters
> then you have to go around the create function ...
*shudder*
No, it's actually much easier. Create a new set of
class attributes - say, 'classExt' - that would hold
the extended attributes for a class. Existing classes
obviously have extended attributes of zero.
To create a new class with extended attributes, you
would write something like this:
-- #40: NewClass
className[ NewClass ] = <class name>
classType[ NewClass ] = <class identifier>
classStyle[ NewClass ] = <style flags>
classExt[ NewClass ] = <extended style flags>
The change to the create() code would be:
-- create control
window_handle[id] = c_func( xCreateWindow, {
classExt[id], -- extended style
buffer1, -- window class name
...
NULL} ) -- creation parameters
And there you have it - support for extended attributes.
Pretty trivial, actually.
-- David Cuny
3. Re: David Win32lib
Thank You David
I will have to sit down and study your instructions.
Bernie
4. Re: David Win32lib
- Posted by Bernie Ryan <bwryan at PCOM.NET>
Jul 23, 1999
-
Last edited Jul 24, 1999
On Fri, 23 Jul 1999 12:22:37 -0700, Cuny, David <David.Cuny at DSS.CA.GOV>
wrote:
>
>No, it's actually much easier. Create a new set of
>class attributes - say, 'classExt' - that would hold
>the extended attributes for a class. Existing classes
>obviously have extended attributes of zero.
>
>To create a new class with extended attributes, you
>would write something like this:
>
>-- #40: NewClass
> className[ NewClass ] = <class name>
> classType[ NewClass ] = <class identifier>
> classStyle[ NewClass ] = <style flags>
> classExt[ NewClass ] = <extended style flags>
>
>The change to the create() code would be:
>
>-- create control
>window_handle[id] = c_func( xCreateWindow, {
> classExt[id], -- extended style
> buffer1, -- window class name
> ...
> NULL} ) -- creation parameters
>
>And there you have it - support for extended attributes.
>
>Pretty trivial, actually.
David
Not so trivial how will this allow me to pass the creation parameter
with out changing the parameter list to your Create function ?
Bernie
Bernie
5. Re: David Win32lib
Bernie Ryan wrote:
> Not so trivial. How will this allow me to pass
> the creation parameter with out changing the
> parameter list to your Create function ?
Obviously, you don't. You would define a new *class* for that control, and
then create a control based on that class. The extended parameters are
associated with the control's class.
Why not give an example of the kind of control you are trying to create?
That way, I can give you a concrete example.
-- David Cuny
6. Re: David Win32lib
Hi, Bernie.
Ignore the prior message; I was confusing extended attributes with something
else.
I'll give some thought to extended parameters...
-- David Cuny
