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Why are vfp controls bitmapped?
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To
04/03/1999 10:46:07
Walter Meester
HoogkarspelNetherlands
General information
Forum:
Visual FoxPro
Category:
Other
Miscellaneous
Thread ID:
00193305
Message ID:
00194039
Views:
19
>Jim, SNIP
>
>>The bitmapping fact has been cited as the reason that:
>
>>1) many ActiveX objects cannot play nicely with VFP
>Why, should this be ? ActiveX controls can have their own Handle withing VFP? I'm not an expert when it comes to Activex but can't the Hwnd control be a solution?

In order to implement the bitmapped controls, VFP uses a non-standard method of implmenting Windows message processing. This can adversely affect the way the controls behave. The Coolbar control is an example of this.

>>2) automated testing software cannot be used successfully on VFP programming
>Hmmm, Again i don't see much of a drawback here as you don't have to use these software. And when this becomes relevant maybe we'll have another solution.

When tools already are in existence, as they are now, it would be nice to be able to use them.

>>These both are relevant to the future, if accurate.
>
>Though i know the bitmap controls are not perfect, I think in almost every case a VFP programmer would not have a big problem with them. Problems with ActiveX controls often occur when vendors of these control dids not test then with VFP or didn't program these according the guidlines MS has given.

As I mentioned earlier, this isn't necessarily the case. A control can be written to the guidelines and either not work or not work properly in VFP.
George

Ubi caritas et amor, deus ibi est
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