> -> Hi,
> ->
> -> on some computers my D3 written program rises a error 'canvas does not
> -> allow drawing'. What can i do to avoid this bug?
> -> Bernd.

> Sorry, no answer to your problem in here, but if you find the answer,
> I'd like to hear about it, too. I had the same problem with a
> component I found, and which refused to work properly in D5, so I had
> to toss it out, sadly. I asked about it in the group some time ago and
> got no relevant answers back, so I assume no one knows what goes on.

> > -> Hi,
> > ->
> > -> on some computers my D3 written program rises a error 'canvas does
not
> > -> allow drawing'. What can i do to avoid this bug?
> > -> Bernd.

> > Sorry, no answer to your problem in here, but if you find the answer,
> > I'd like to hear about it, too. I had the same problem with a
> > component I found, and which refused to work properly in D5, so I had
> > to toss it out, sadly. I asked about it in the group some time ago and
> > got no relevant answers back, so I assume no one knows what goes on.

> This is an error frequently seen with poorly written controls. The
exception
> is a delphi-created one, when the canvas does not have a valid handle. I'm
> not 100% sure, but I guess this happens when the control is not properly
> initialized, often caused by an exception in the creation process. ISTM
that
> it's even easier to get this error at designtime with a custom created
> control (because all stuff done to a control is done when the control is
> visible).

> It may also happen when you're out of GUI resources (Win9x).

> on some computers my D3 written program rises a error 'canvas does not
> allow drawing'. What can i do to avoid this bug?
> Bernd.

> -> > to toss it out, sadly. I asked about it in the group some time ago and
> -> > got no relevant answers back, so I assume no one knows what goes on.
> ->
> -> This is an error frequently seen with poorly written controls. The
exception
> -> is a delphi-created one, when the canvas does not have a valid handle.
I'm
> -> not 100% sure, but I guess this happens when the control is not properly
> -> initialized, often caused by an exception in the creation process. ISTM
that
> -> it's even easier to get this error at designtime with a custom created
> -> control (because all stuff done to a control is done when the control is
> -> visible).
> ->
> -> It may also happen when you're out of GUI resources (Win9x).

> As you say, this error occurred while designing the GUI, dropping a
> component on a blank form, then switching to the code editor and
> switching back to the form lead to this error. So, in essence, when
> the form was repainting itself after it had been hidden the error
> occurred. The mystery is that it didn't do this at the time I dropped
> the component on the form. Initial painting seems ok. Repainting goes
> berserk, for every icon in the component in need of repainting. But it
> still updates the icons! Doing this for a couple of time makes Delphi
> unstable and after a few more times there is an internal Delphi error,
> which, according to the help file, "you should never get..."

>-> Hi,
>->
>-> on some computers my D3 written program rises a error 'canvas does not
>-> allow drawing'. What can i do to avoid this bug?
>-> Bernd.

>Sorry, no answer to your problem in here, but if you find the answer,
>I'd like to hear about it, too. I had the same problem with a
>component I found, and which refused to work properly in D5, so I had
>to toss it out, sadly. I asked about it in the group some time ago and
>got no relevant answers back, so I assume no one knows what goes on.

>Could be any number of things, I guess. From bad coding to
>faulty and/or outdated system DLLs. Take your pick! ;-)

>Quivis.
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