垂直放置显示器

Question

如何将显示器设置在垂直位置？

下面的

代码可以设置分辨率和刷新率，但我无法弄清楚如何将两个显示器设置在垂直位置。

我尝试过dm.dmDisplayOrientation但没有奏效。 在将显示设置为垂直对齐时还有其他配置。

使用Windows显示设置进行设置时的垂直对齐工作。

int main(int argc, char* argv[])
{
    SetDisplay("DELL S2240L(Analog)",0,0,1600,900,60,false);
    SetDisplay("DELL S2240L(Hdmi)",0,900,1600,1800,60,true);
    return 0;
}

bool SetDisplay(std::string monitorname,int pox,int poy,int w,int h,int r,bool parent)
{
    DWORD iDevNum(0);
    DISPLAY_DEVICE dd;
    dd.cb = sizeof(dd);

    while ( EnumDisplayDevices(0, iDevNum, &dd, 0) )
    {
        if (dd.StateFlags & DISPLAY_DEVICE_ATTACHED_TO_DESKTOP)
        {
            DISPLAY_DEVICE dd2;
            dd2.cb = sizeof(dd2);
            EnumDisplayDevices(dd.DeviceName, 0, &dd2, 0);

            if(monitorname.compare(dd2.DeviceString)==0)
            {                   
                DEVMODE dm;
                ZeroMemory(&dm ,sizeof(dm));
                dm.dmSize = sizeof(DEVMODE);
                if (!EnumDisplaySettings(dd.DeviceName, ENUM_CURRENT_SETTINGS, &dm))
                {
                    std::cout <<"EnumDisplaySettings failed:%d\n"<< GetLastError()<< std::endl;
                    return FALSE;
                }


                dm.dmPelsWidth = w;
                dm.dmPelsHeight = h;

                POINTL po;
                po.x=pox;
                po.y=poy;
                dm.dmPosition = po;
                dm.dmDisplayFrequency = r;


                dm.dmFields = (DM_PELSWIDTH | DM_PELSHEIGHT | DM_DISPLAYFREQUENCY | DM_POSITION );//| DM_DISPLAYORIENTATION );


                if (ChangeDisplaySettings(&dm, CDS_TEST) !=DISP_CHANGE_SUCCESSFUL)
                {
                    std::cout << "Illegal graphics mode: %d\n"<< GetLastError()<< std::endl;                
                }
                else
                {
                    std::cout << "can be applied on "<< dd.DeviceString<< std::endl;
                }

                std::cout << "try applied on "<< dm.dmDeviceName<< std::endl;


                ChangeDisplaySettingsEx(dd.DeviceName, &dm, NULL, CDS_FULLSCREEN| CDS_SET_PRIMARY  , NULL);

            }
            else
            {
                std::cout <<" no "<<monitorname.c_str()<<" =="<<dd2.DeviceString  << std::endl;
            }    
        }
        ++iDevNum;
    }
}

对齐前的屏幕

对齐后的屏幕