OpenEuphoria

Re: SendMessage Returns a Value?

• Posted by Evan Marshall <1evan at sbcglobal.net> Mar 23, 2004
• 453 views

No.  I see now that WM_FONTCHANGE returns 0, others may return handles 
or TRUE, etc.


Evan Marshall wrote:

>
> From the SDK: The return value specifies the result of the message 
> processing; it depends on the message sent.
>
> It appears that a WM_FONTCHANGE message will return 0.  Maybe 
> SendMessage will return 0 for any message unless you specify a 
> different value?
>
> i.e.
>
> if uMsg = WM_FONTCHANGE then
>    return 100
> end if
>
> will return 100 as a result
>
> whereas
>
> if uMsg = WM_FONTCHANGE then
> end if
>
> returns 0
>
>
> C. K. Lester wrote:
>
>>
>> I've looked up SendMessage info at msdn, but can't find return values 
>> for success/fail. Does anybody know how to determine if the message 
>> was sent or received properly?
>>
>> Here's the snippet of code I'm using...
>>
>>    -- call AddFontResource
>>    if AddFontResource != -1 then
>>        junk = allocate_string( "free000.ttf" )
>>        if xSendMessage!= -1 then
>>            fonter = c_func( AddFontResource, { junk } )
>>            if fonter != 0 then
>>                junk = c_func(xSendMessage,{HWND_BROADCAST, 
>> WM_FONTCHANGE, 0, 0})
>> -- RIGHT HERE... HOW DO I DETERMINE IF xSendMessage completed properly?
>>                didAddFontResource = (1=1)
>>            else
>>                errMsg = "AddFontResource failed."
>>            end if
>>        else
>>            errMsg = "Could not access SendMessage."
>>        end if
>>        free(junk)
>>    else
>>        errMsg = "Could not access AddFontResource."
>>    end if
>>
>>
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>
>
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>