Get the name of a monitor

Question

I'm having a bit of trouble retrieving the name of a monitor with winapi. According to other entries on stackoverflow, the correct way to get the name of a monitor is this:

EnumDisplayDevices(nullptr, 0, &oDisplayDevice, 0);

char lpszDeviceName[32];
memcpy(lpszDeviceName, oDisplayDevice.DeviceName, 32);

EnumDisplayDevices(lpszDeviceName, 0, &oDisplayDevice, 0);

char lpszMonitorName[128];
memcpy(lpszMonitorName, oDisplayDevice.DeviceString, 128);

However, EnumDisplayDevices returns FALSE the second time around. The first time around, DeviceName is \\DISPLAY1 and DeviceString is the GPU vendor. Using the MONITORINFOEX struct gives me the same value as DeviceName.

To be clear I'm looking for something like "Samsung blah blah," or what appears in the control panel on the screen resolution page.

Answer 1

This seems to return the proper data for me:

#include <Windows.h>
#include <iostream>
#include <string>

int main()
{
    DISPLAY_DEVICE dd;
    dd.cb = sizeof(dd);
    int deviceIndex = 0;
    while(EnumDisplayDevices(0, deviceIndex, &dd, 0))
    {
        std::string deviceName = dd.DeviceName;
        int monitorIndex = 0;
        while(EnumDisplayDevices(deviceName.c_str(), monitorIndex, &dd, 0))
        {
            std::cout << dd.DeviceName << ", " << dd.DeviceString << "\n";
            ++monitorIndex;
        }
        ++deviceIndex;
    }
    return 0;
}

If you're compiling for UNICODE then use this instead:

#include <Windows.h>
#include <iostream>
#include <string>

int main()
{
    DISPLAY_DEVICE dd;
    dd.cb = sizeof(dd);
    int deviceIndex = 0;
    while(EnumDisplayDevices(0, deviceIndex, &dd, 0))
    {
        std::wstring deviceName = dd.DeviceName;
        int monitorIndex = 0;
        while(EnumDisplayDevices(deviceName.c_str(), monitorIndex, &dd, 0))
        {
            std::wcout << dd.DeviceName << L", " << dd.DeviceString << L"\n";
            ++monitorIndex;
        }
        ++deviceIndex;
    }
    return 0;
}

Here's an example of the output:

\.\DISPLAY1\Monitor0, Dell U2410(DP)
\.\DISPLAY2\Monitor0, Dell 2407WFP-HC (Digital)