Why does EnumDisplayDevices not output the monitor name?

[Jack Hammered]

The if statement prints out "Monitor Name: " but then blank where the name should be. So it appears the function does not fail.

    void EnumerateMonitorCapabilities()
    {
    	int cDevices = 0;
    	int cMonitors = 0;
    	DISPLAY_DEVICE ddDevice;
    	ZeroMemory(&ddDevice, sizeof(DISPLAY_DEVICE));
    	ddDevice.cb = sizeof(DISPLAY_DEVICE);
    	while (EnumDisplayDevices(NULL, cDevices, &ddDevice, EDD_GET_DEVICE_INTERFACE_NAME))
    	{
    		if (ddDevice.StateFlags & DISPLAY_DEVICE_ACTIVE)
    		{
    			DISPLAY_DEVICE ddMonitor;
    			ZeroMemory(&ddMonitor, sizeof(DISPLAY_DEVICE));
    			if (EnumDisplayDevices(ddDevice.DeviceName, 0, &ddMonitor, 0))
    			{
    				std::cout << "\nMonitor Name: " << ddMonitor.DeviceName << std::endl;
    			}
    			cMonitors++;
    		}
    		cDevices++;
    	}
    }