Windows DPI settings

[jan.loucka]

Hi,
is there any way how can I get the current user windows DPI settings?
We're writting some mapping software and we need to know if the user
changes the DPI for scale calculations.
Thanks
Jan

 

[David R. Longnecker]

System Metrics
Microsoft® Windows® provides a number of system metrics that you should use
to eliminate assumptions about the user’s system. GetDeviceCaps() can be
used to obtain a display’s DPI (pass in LOGPIXELSX or LOGPIXELSY for the
second parameter). GetSystemMetrics() and SystemParametersInfo() provide
sizes for nearly every graphical element in Windows, from the width of a
three-dimensional border to the size of a small icon. One of the less obvious
metrics is the minimum line thickness (pass SM_CYBORDER or SM_CXBORDER to
GetSystemMetrics). At very high DPIs, a one-pixel-wide line is nearly invisible.

http://msdn2.microsoft.com/en-us/library/ms969894.aspx

HTH.

-dl

 

[Chris Dunaway]

System Metrics
Microsoft® Windows® provides a number of system metrics that you should use
to eliminate assumptions about the user's system. GetDeviceCaps() can be
used to obtain a display's DPI (pass in LOGPIXELSX or LOGPIXELSY for the
second parameter). GetSystemMetrics() and SystemParametersInfo() provide
sizes for nearly every graphical element in Windows, from the width of a
three-dimensional border to the size of a small icon. One of the less obvious
metrics is the minimum line thickness (pass SM_CYBORDER or SM_CXBORDER to
GetSystemMetrics). At very high DPIs, a one-pixel-wide line is nearly invisible.

http://msdn2.microsoft.com/en-us/library/ms969894.aspx

HTH.

-dl

Or, in the .Net world, you could try this:

using (Graphics g = this.CreateGraphics()) {
MessageBox.Show("DpiX: " + g.DpiX.ToString() + ",
DpiY: " + g.DpiY.ToString());
}