Transparency issues

[Pottery]

$hGUI2 = GUICreate('', 16, 31, 430, 500, $WS_POPUP, BitOR($WS_EX_LAYERED, $WS_EX_MDICHILD), $hGUI)
$Pic = GUICtrlCreatePic('pfront.bmp', 0, 0, 16, 31)

I did BitOR($WS_EX_LAYERED, $WS_EX_MDICHILD) so the white background on my image would dissapear; and it did.

When I do

GUICtrlSetImage($Pic, 'pback.bmp')

The white background is back again until I change it back to pfront.bmp, any ideas?

Edited July 26, 2010 by Epdmk

[martin]

$hGUI2 = GUICreate('', 16, 31, 430, 500, $WS_POPUP, BitOR($WS_EX_LAYERED, $WS_EX_MDICHILD), $hGUI)
$Pic = GUICtrlCreatePic('pfront.bmp', 0, 0, 16, 31)

I did BitOR($WS_EX_LAYERED, $WS_EX_MDICHILD) so the white background on my image would dissapear; and it did.

When I do

GUICtrlSetImage($Pic, 'pback.bmp')

The white background is back again until I change it back to pfront.bmp, any ideas?

I don't know, but the transparent colour for a WS_EX_LAYERED window is set to the colour in the top left pixel of the last bitmap loaded, so maybe that is the problem. (That is unless you specifically set it to some other colour, see below.)

I gues it's only because in AutoIt a WS_EX_MIDICHILD window is not a real child but is simulated that transparency works at all, because you can't have a transparent child window.

Search for _API_SetLayeredWindowAttributes in these forums which might help you.