[Vm-dev] Windows VM broken for ioShowDisplay

Marcel Taeumel marcel.taeumel at hpi.de
Mon Nov 14 11:59:40 UTC 2022

Hi Tobias --

There is no leak of GDI objects on my machine. Squeak 6.0 VMs seem to be fine... Please let us clarify this issue first.

Am 14.11.2022 12:57:17 schrieb Tobias Pape <das.linux at gmx.de>:

Maybe someone can revoke my C-license?
It's the second time I introduced a Leak with the DPI stuff -.-

> On 14. Nov 2022, at 12:13, Nicolas Cellier wrote:
> Hmm, maybe a clue:
> static double getDpiSystem(void)
> {
> return (double) GetDeviceCaps(GetWindowDC(stWindow), LOGPIXELSY);
> }
> shouldn't there be a ReleaseDC here ?

Probably. I didn't know that this stuff acquired something, but is makes sense.
Shall I or do you want?


> Le lun. 14 nov. 2022 à 12:10, Nicolas Cellier a écrit :
> I confirm that it is a GDI LEAK.
> If I display the number of GDI objects in the task manager, I see that the number grows up to 10,000 at which time the image hangs...
> Le lun. 14 nov. 2022 à 11:24, Nicolas Cellier a écrit :
> Sorry, for shorten message, continued below...
> Le lun. 14 nov. 2022 à 11:18, Nicolas Cellier a écrit :
> Hi all,
> as Eliot already reported in October, after a few minutes, the 64bits image locks up on windows.
> The console reports an error from within ioShowDisplay
> SetDIBitsToDevice failed (0)
> width=1364,height=757,bits=7FF7471D68E8,dc=FFFFFFFF9D010B72
> then several other gdi calls start to fail, like
> CreateCursor failed (0)
> a bit further, SetDIBitsToDevice failed (8), the error message concerns
> The error message a bit further is about insufficient memory resources to perform the SetDIBitsToDevice
> If I open an image, leave it alone, and observe the Squeak.exe process in TaskManager, I clearly see a memory leak.
> The error happens after about 15 or 16Mbytes increase.
> So we should track the origin of un-released resources, and the problem will then probably vanish.
> For now, it's a show-stopper for me.
> Nicolas

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