Re: ChangeDisplaySettingsEx driving me nuts...

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#7917

From: Bob Gonder
Date: Wed, 15 Dec 2004 16:55

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Graham Thompson wrote:

>I'm developing in Windows XP using BCB5, and I'm trying to disable the
>secondary monitor in a two-monitor setup.
>
>Trawling through the MSDN it looks like ChangeDisplaySettingsEx is a good
>place to start ... I've enumerated my DisplayDevices like a good boy, but
>when I go to call ChangeDisplaySettingsEx I get an access violation.

You'll need to show the code. Just the bare minimum, please. But do
include the enum as the docs suggest using the devmode from the enum.

> Is ChangeDisplaySettingsEx part of GDI+? If os, should I be initialising GDI+
>with GdiplusStartup() before calling ChangeDisplaySettingsEx?

Looks like the + stuff are C++ objects, and you don't seem to be using
objects here.

>BTW (or should that be WTF): if I declare a spare DEVMODE struct in the
>function that calls ChangeDisplaySettingsEx, I don't get an access
>violation; the function succeeds but sets 'inappropriate' values.

A "spare" structure?

DEVMODE problems are sometimes fixed by adding
#define _WIN32_WINNT 0x0400
before any other #includes

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From: Bob Gonder <notbg@notmindspring.invalid>
Newsgroups: borland.public.cppbuilder.nativeapi
Subject: Re: ChangeDisplaySettingsEx driving me nuts...
Date: Wed, 15 Dec 2004 08:55:20 -0800
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