How to identify all monitors and their resolutions

Recently I was busy with the normal initialization of the window, and the task was to detect all monitors and their resolutions. I leave here a solution for posterity.

appRet aApplication::ObtainMonitors() { DWORD i = 0; DWORD j; DISPLAY_DEVICE dc; dc.cb = sizeof(dc); while(EnumDisplayDevices(NULL, i, &dc, EDD_GET_DEVICE_INTERFACE_NAME) != 0) { if ((dc.StateFlags & DISPLAY_DEVICE_ACTIVE) && !(dc.StateFlags & DISPLAY_DEVICE_MIRRORING_DRIVER)) { DEVMODE dm; j = 0; while(EnumDisplaySettings(dc.DeviceName, j, &dm) != 0) { // DEVMODE dm,         // ChangeDisplaySettings,     ++j; } } ++i; } if (i == 0) return APP_NOMON; return APP_DONE; } 

Because we do not know in advance what devices can be in the system, then we will have to run in cycles. First, through the second parameter of the EnumDisplayDevices function , we iterate through all the monitors in the current user session. Then after if (dc.StateFlags & DISPLAY_DEVICE_ACTIVE) we are convinced that the “monitor” is in touch and not sleeping. Well, after we learn his name in dc.DeviceName and can run through EnumDisplaySettings on all available permissions of this “monitor”.
I tested it by connecting LG to a laptop: canal, detecting and even using it.

UPD : Added a conditional check on the parameter DISPLAY_DEVICE_MIRRORING_DRIVER to discard the virt. devices. Thank you shrikus