I'm getting an error from the compiler that I don't understand, and would appreciate any help.  The error is:

  'this' is required, but OS is not a base class of Decorations

The error is on the return OS.DefMDIChildProc() line.

decorations.d:
----------------------------
public class Decorations : Canvas {

    int callWindowProc (int msg, int wParam, int lParam) {
        return OS.DefMDIChildProc (handle, msg, wParam, lParam);
    }

}

os.d
----------------------------

class OS {

    int DefMDIChildProc (int hWnd, int Msg, int wParam, int lParam) {
        if (IsUnicode) return DefMDIChildProcW (hWnd, Msg, wParam, lParam);
        return DefMDIChildProcA (hWnd, Msg, wParam, lParam);
    }

}

On Sun, 23 May 2004 00:30:24 -0500, Brad Anderson wrote:

> I'm getting an error from the compiler that I don't understand, and would appreciate any help.  The error is:
> 
>    'this' is required, but OS is not a base class of Decorations
> 
> The error is on the return OS.DefMDIChildProc() line.
> <SNIP>

I'm betting that the error is that DefMDIChildProc is not a static method, and you're calling it in a static context. That is a particularly bad error message, though.

Mike Swieton
__
I believe you should live each day as if it is your last, which is why I don't
have any clean laundry because, come on, who wants to wash clothes on the last
day of their life?
	- Anonymous kid, aged 15 (but may as well be me!)

Making DefMDIChildProc() static in os.d didn't seem to help :(

BA

Mike Swieton wrote:

> On Sun, 23 May 2004 00:30:24 -0500, Brad Anderson wrote:
> 
> 
>>I'm getting an error from the compiler that I don't understand, and would appreciate any help.  The error is:
>>
>>   'this' is required, but OS is not a base class of Decorations
>>
>>The error is on the return OS.DefMDIChildProc() line.
>><SNIP>
> 
> 
> I'm betting that the error is that DefMDIChildProc is not a static method, and
> you're calling it in a static context. That is a particularly bad error
> message, though.
> 
> Mike Swieton
> __
> I believe you should live each day as if it is your last, which is why I don't
> have any clean laundry because, come on, who wants to wash clothes on the last
> day of their life?
> 	- Anonymous kid, aged 15 (but may as well be me!)
> 

But making the method static AND making the class static did work.

Maybe we can get a better error message from the compiler.

Thanks, Mike.

BA

Brad Anderson wrote:
> Making DefMDIChildProc() static in os.d didn't seem to help :(
> 
> BA
> 
> Mike Swieton wrote:
> 
>> On Sun, 23 May 2004 00:30:24 -0500, Brad Anderson wrote:
>>
>>
>>> I'm getting an error from the compiler that I don't understand, and would appreciate any help.  The error is:
>>>
>>>   'this' is required, but OS is not a base class of Decorations
>>>
>>> The error is on the return OS.DefMDIChildProc() line.
>>> <SNIP>
>>
>>
>>
>> I'm betting that the error is that DefMDIChildProc is not a static method, and
>> you're calling it in a static context. That is a particularly bad error
>> message, though.
>>
>> Mike Swieton
>> __
>> I believe you should live each day as if it is your last, which is why I don't
>> have any clean laundry because, come on, who wants to wash clothes on the last
>> day of their life?
>>     - Anonymous kid, aged 15 (but may as well be me!)
>>

On Sun, 23 May 2004 23:36:40 -0500, Brad Anderson wrote:

> But making the method static AND making the class static did work.
> 
> Maybe we can get a better error message from the compiler.
> 
> Thanks, Mike.
> 
> BA

Ok, I'll bite: what does static mean in the context of a class?

Mike Swieton
__
If I need a screwdriver and I select a hammer, I probably won't get anywhere
and will eventually realize my error. The problem with software is that we are
able to turn a hammer into a screwdriver.
	- Laurent Bossavit

It didn't work yesterday when I only made the method static, but things began to work as I did this:

public static class OS {

    static int DefMDIChildProc() {
        ...
    }

}

It didn't make much sense to me, but I tried it.  The spec says that static is only used on functions and data.  But I couldn't get the code to work unless I added it up by class.

Now, of course, after your post questioning this, I took out the static before class and it works fine.   So I must have had something else wrong.

BA



Mike Swieton wrote:
> On Sun, 23 May 2004 23:36:40 -0500, Brad Anderson wrote:
> 
> 
>>But making the method static AND making the class static did work.
>>
>>Maybe we can get a better error message from the compiler.
>>
>>Thanks, Mike.
>>
>>BA
> 
> 
> Ok, I'll bite: what does static mean in the context of a class?
> 
> Mike Swieton
> __
> If I need a screwdriver and I select a hammer, I probably won't get anywhere
> and will eventually realize my error. The problem with software is that we are
> able to turn a hammer into a screwdriver.
> 	- Laurent Bossavit
>