CODEWITHSUNDEEP
c++winapi
fredley
fredley

Reputation: 33941

How can you get the display adapter used for a particular monitor in Windows?

On a Mac, I can use the following to print out the adapter used for a particular monitor:

io_registry_entry_t dspPort = CGDisplayIOServicePort(displays[i]);
CFDataRef model_;
model_ = (CFDataRef)IORegistryEntrySearchCFProperty(dspPort,kIOServicePlane,CFSTR("model"),
                                                    kCFAllocatorDefault,
                                                    kIORegistryIterateRecursively | kIORegistryIterateParents);

if (model_) {
  newLine();
  String model((const char*)CFDataGetBytePtr(model_), CFDataGetLength(model_));
  log.printf("Adapter: %s", model.buf);
  CFRelease(model_);
}

Example output-    Adapter: AMD Radeon HD 6750M

Where displays[i] is populated using CGGetActiveDisplayList(nDisplays, displays, &nDisplays);

Is there any way to do the equivalent operation on Windows? I'm cycling through all displays using EnumDisplayMonitors.

I can get a list of adapters using EnumDisplayDevices, but how do I see which monitor is attached to which adapter?

Edit

Using:

for (int i=0; EnumDisplayDevicesA(monitorInfo.szDevice, i, &dev, 0); i++) {
    newLine();
    log.printf("Display Device: %s",(char*)dev.DeviceString);
  }

I can get the device names of the monitors themselves, but not the adapters they are connected to!

Upvotes: 2

Views: 4404

Answers (1)

Frerich Raabe
Frerich Raabe

Reputation: 94549

I can think of three approaches:

  1. The EnumDisplayDevices documentation mentions that the dwFlags argument can be used to get a device ID which can be used with the SetupAPI functions. That API provide a whole range of functions to get device information. So maybe you can get the device ID from EnumDisplayDevices, stick that into some SetupAPI function to get the monitor device struct, and get the display adapter device ID from there.

  2. You can probably use the Win32_VideoController class via WMI to get the display adapter information.

  3. I can imagine that some DirectX API is available for getting information about the installed graphics hardware.

Upvotes: 4

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