Dialog size does not change when DPI settings change

[_T No name]

Hi, I have made a custom dialog have done some custom Drawing on it. it is derived from CDialog. when i change DPI settings on my system dialog size does not change accordingly.. I need it to be changed as i have set my font size according to DPI and font size changes.. plz help P.S. :- Not even dialog size i have some other custom controls also like button its size also does not change in my application Thanks

[KingsGambit]

May be you can handle WM_SETTINGCHANGE or WM_DISPLAYCHANGE message and see if you get the notification when the system settings is changed.

[_T No name]

that message is coming... but do i need to handle this seperately.. i mean shouldnt MFC change window size automatically ???

[CPallini]

_T("No name") wrote:

i mean shouldnt MFC change window size automatically ???

Well, if it doesn't (and looks like it doesn't) then you have to do it, I guess it isn't such a daunting task. :)

If the Lord God Almighty had consulted me before embarking upon the Creation, I would have recommended something simpler. -- Alfonso the Wise, 13th Century King of Castile.
This is going on my arrogant assumptions. You may have a superb reason why I'm completely wrong. -- Iain Clarke
[My articles]

[_T No name]

i am not getting any idea how to incorporate DPI in setting my dialog's width.. can u help me out....

[CPallini]

If you wish to update your dialog size then, one simple way may be:

• define a default (pixel) size for a default DPI setting (for instance 800x600 pixels for 96x96 dpi).
• on receiving the 'system dpi changed' notification, change the size according to new dpi settings, for instance, 120x120 dpi would require: (800*120/96) x (600*120/96) pixels = 1000x750 pixels.

You may obtain system dpi settings with the following code

HDC hdc = GetDC(NULL);
int dpix = GetDeviceCaps(hdc, LOGPIXELSX);
int dpiy = GetDeviceCaps(hdc, LOGPIXELSY);
ReleaseDC(NULL, hdc);

:)

If the Lord God Almighty had consulted me before embarking upon the Creation, I would have recommended something simpler. -- Alfonso the Wise, 13th Century King of Castile.
This is going on my arrogant assumptions. You may have a superb reason why I'm completely wrong. -- Iain Clarke
[My articles]