Simple macro does not replace well?

[Edwin Knoppert]

I have this macro:

Macro hello = EnableWindow

And i try to use it like this:

    Local hWnd As Long
    hWnd = GetDlgItem( nCbHndl, %ID_FORM1_BUTTON1 )
    hello hWnd, 0
    hello( hWnd, 0 )

hWnd is the control's hwnd and only the firest hello is accepted by the compiler (8.04).
The 2nd gives me:

Mismatch with prior definition
Line 8: hello( hWnd, 0 )

In my opinion both should work??

[Petr Schreiber jr]

Hi Edwin,

it is a bid odd.
To make it work with parenthesis you can go for:

MACRO hello( par1, par2 ) = EnableWindow( par1, par2 )

... but this way it won't work without parenthesis
So maybe better to simply stick with one convention.

I thought PB MACROs simply seek & replace, but it seems they do something more.


Petr

[Michael Mattias]

Needs space between "hello" and "(" ???

[Edwin Knoppert]

I tried already

[Michael Mattias]

This might sound silly Edwin, but have you checked your DECLARE for EnableWindow()?

i.e, it is remotely possible the '480' error message actually means it this time.

[Edwin Knoppert]

Does it work for you?
It is a simple matter to test like:

#include "win32api.inc"

MACRO hello = EnableWindow

pbmain...
if 0 = 1 then
hello( 0, 0 )

end if

?

[Chris Holbrook]

Does it work for you?

I don't know the reason for sure, but when I first encountered it, I assumed that the macro definition has a special case for "no arguments", and has thus identified the macro as one which takes no arguments. However, this is not consistent with the macro passing compilation if the arguments are parenthesised.

I suggest that you drop a line to PowerBasic about this one.

[Iain Johnstone]

At the risk of sticking my neck out and feeling the wrath of MM:-
hello hWnd, 0 on its own is OK, but is it not something=hello( hWnd, 0 )?

Expecting to get flamed on this

Iain Johnstone

[Edwin Knoppert]

For now i used the parameters as suggested.
Though i wanted to make an alias for an existing function, not this but similar.

[Michael Mattias]

>Does it work for you?

I do not have same version of compiler in use, but I get the same error in PB/Win 8.03

hello (0,0) ==> 480 parameter mismatch
hello  0,0   ==> compiles OK
a = hello (0,0)  ==> 480 parameter mismatch

I think I know the problem: when you use the parens, it's ambiguous as to what the parens mean: Do these parens delimit MACRO tokens and should be used at substitution time or are they part of what should follow after MACRO substitution?

Workaround: Instead of MACRO, use DWIMMACRO ( Do What I Mean MACRO)

MCM

[Edwin Knoppert]

>Workaround: Instead of MACRO, use DWIMMACRO ( Do What I Mean MACRO)

Huh?

[Michael Mattias]

Oh, that's right, DWIMMACRO is in 8.03. They must have removed it in 8.04.

(I knew there was a reason I didn't upgrade right away!)

MCM

[StanHelton]

>Workaround: Instead of MACRO, use DWIMMACRO ( Do What I Mean MACRO)

Huh?

It's a joke. No such thing.