How can I retrieve monitor information?

Question

I am trying to retrieve the monitor ID's as shown in the Windows display properties (#1, 2... etc), but I can't seem to find a way. I have tried using EnumDisplayMonitors as well as EnumDisplayDevices. They both return something like "\.\DISPLAY1". However, this number doesn't always match the number shown by Windows, especially when 2 video cards are being used to drive 3 or more monitors. Is there an API call I am missing to retrieve this information, or is there a way to get it from the registry or somewhere else? Thanks!

I have tried these methods:
Win32: EnumDisplayMonitors, EnumDisplayDevices: Neither of these return monitors that aren't active, and neither one returns the correct IDs.
WMI: "select * from Win32_DesktopMonitor" doesn't return all the monitors, and there is no ID.
Registry: I have found the monitors in various locations, none of the places I found have the info I am looking for.

Any help is much appreciated. :)

Update: These are the monitor numbers I am looking for:

Answer 1

Just a guess, but it looks like Windows shows iDevNum+1 in Windows display properties.

Answer 2

Did you make two calls to EnumDisplayDevices? Try something like:

while (EnumDisplayDevices(0, dev, &dd, 0))
{
...
  while (EnumDisplayDevices(dd.DeviceName, devMon, &ddMon, 0))
  {
   ...
  }
}

Answer 3

Depending on the purpose, you might want to look toward a driver-based solution. I know nVidia have some decent libs that gives you access to most of the functions un the control pannel.