Solved

EnumDisplaySettings() and display frequencies

Posted on 1997-06-28
2
327 Views
Last Modified: 2013-12-03
I have an app which allows the user to switch display resolution. On NT I get the display frequencies available for a particular resolution and allow the user to pick which one to use. On one particular machine (DELL 486 with Cyrix video card running NT 4) one of the avilable frequencies returned by EnumDisplaySettings() is a frequency of 1 Hz! Is this the default hardware setting? Should I treat settings below, say 20 as default frequencies?
0
Comment
Question by:dhardiman
2 Comments
 
LVL 3

Expert Comment

by:byang
ID: 1399521
Yes, obviously the video driver is not returning the correct frequency value. Treat anything below 30 as default. The lowest I've seen is 40 or 45.
0
 
LVL 4

Accepted Solution

by:
md041797 earned 50 total points
ID: 1399522
From the DDK:
When you call the EnumDisplaySettings function, the dmDisplayFrequency member may return with the value 0 or 1. These values represent the display hardware's default refresh rate. This default rate is typically set by switches on a display card or computer motherboard, or by a configuration program that does not use Win32 display functions such as ChangeDisplaySettings.
0

Featured Post

Salesforce Made Easy to Use

On-screen guidance at the moment of need enables you & your employees to focus on the core, you can now boost your adoption rates swiftly and simply with one easy tool.

Question has a verified solution.

If you are experiencing a similar issue, please ask a related question

Suggested Solutions

This article describes how to programmatically preset the "Pages per Sheet" option that's available with most printer drivers.   This setting lets you do "n-Up" printing, where two, four, or more pages are printed on each sheet of paper. If your …
This article describes how to add a user-defined command button to the Windows 7 Explorer toolbar.  In the previous article (http://www.experts-exchange.com/A_2172.html), we saw how to put the Delete button back there where it belongs.  "Delete" is …
This is Part 3 in a 3-part series on Experts Exchange to discuss error handling in VBA code written for Excel. Part 1 of this series discussed basic error handling code using VBA. http://www.experts-exchange.com/videos/1478/Excel-Error-Handlin…

829 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question