thanks mark.
i've got to the bottom of the problem -- there seems to be a problem with
constructing/updating PyBitmaps.
or, more generally, the fuzzy boundary between win32gui and win32ui. what
do you think about python-wrapping the win32 api, and building the
MFC-like class system in python? a few win32gui functions are missing,
which means i have to use win32ui. but i guess there's venster for
that... but it appears pretty inactive.
this code works:
hwnd=CreateWindow(...)
wnd=CreateWindowFromHandle(hwnd)
dc=GetDC(hwnd)
bm=CreateBitmapFromHandle(CreateCompatibleBitmap(dc,w,h))
print bm.GetSize()
--> (944,734)
while this (supposedly evuivalent) code:
wdc=wnd.GetDC()
bm=CreateBitmap()
bm.CreateCompatibleBitmap(wdc,w,h)
print bm.GetSize()
--> (0,0)
Mark Hammond said:
>> hi, i can't seem to create a bitmap in memory using pywin32.
>> my assert
>> fails, telling me that the bitmap size is (0,0)?
>
> I'm no expert on GDI programming at all. However, I have code that
works
> that looks like:
>
> hdcBitmap = win32gui.CreateCompatibleDC(0)
> hdcScreen = win32gui.GetDC(0)
> hbm = win32gui.CreateCompatibleBitmap(hdcScreen, size_x, size_y)
hbmOld = win32gui.SelectObject(hdcBitmap, hbm)
> # draw on hbm
> win32gui.SelectObject(hdcBitmap, hbmOld)
> win32gui.DeleteDC(hdcBitmap)
> win32gui.DeleteDC(hdcScreen)
> # hbm can now be used.
>
> That appears subtly different. The code is from
> win32\Demos\win32gui_menu.py - it draws some bitmaps on menus.
>
> Mark
>
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