geting the formshot

Hello,

Is it possible to take a window (form) screenshot in windows xp by reading it's canvas property and will that work if the window is mimimized or covered by another window? I know that you can draw on a form's canvas, read the content and store it as a bitmap and also by reading the canvas of the entire desktop you can get a screenshot, but can you get a formshot?

Thank you, Hrvoje
hdagelicAsked:
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Jeff PerkinsOwnerCommented:
Nope,
If the windows is minimized, you won't get the formshot/screenshot from properties.
Sorry
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ziolkoCommented:
you can use BitBlt() function if you have handle of source canvas,
but when form is not shown or minimized you will not be able to take its snapshot
canvas contents are not stored all the time form is painted when becomes visible thru Paint method
(defined in TCustomControl) when control recives WM_PAINT message

ziolko.
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ziolkoCommented:
sorry riteheer i didn't refresh my webbrowser

ziolko.
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Jeff PerkinsOwnerCommented:
ziolko,
Is np, happens all the time, and just reaffirms the asker is getting good advice and plenty of attetion... <smile>
Good day,
Jappo
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ziolkoCommented:
heh:) i just hope he's here for advice not attention :)

ziolko.
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hdagelicAuthor Commented:
Ok, thanks,  that could be solved by intercepting WM_MINIMIZE or something like that and taking the formshot just before. But do you know if it would work if the window is under another window? I know that when you drag another window over a form it clears that area of a form, but it gets repainted... I also find it strange that googleing for formshots returns nothing special.
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ziolkoCommented:
i did this:
BitBlt(Self.Canvas.Handle, 0, 0, Form2.ClientWidth, Form2.ClientHeight, Form2.Canvas.Handle, 0, 0, SRCCOPY);

with form2 partly covered and result was same as on screen so also covered.

window repaints only that region which is visible, so i'm afraid answer is no again

ziolko.
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hdagelicAuthor Commented:
You also couldn't get the shots with MDI child forms when reading the parent's canvas. True?
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ziolkoCommented:
i didn't  try it with MDI but basically you can make snapshot of what you can see on monitor.

ziolko.
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hdagelicAuthor Commented:
Shure, that's all I need, thanks.
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