win10 多屏下修改分辨率

2024-04-16

利用win32api 获取屏幕数量，再根据具体选择的屏幕设置分辨率

首先，利用EnumDisplayDevicesA查找显示器信息
然后根据设备名，调整具体要修改的分辨率屏幕

DISPLAY_DEVICEA DispDev;
int i = 0;
ZeroMemory(&DispDev, sizeof(DispDev));
DispDev.cb = sizeof(DispDev);
char DeviceName[32] = {0};

// 找到所有的显示器
for (i = 0; EnumDisplayDevicesA(NULL, i, &DispDev, 0); i++)
{
    // 注释掉的是标识用于查找主显示器
    if(/*DispDev.StateFlags & DISPLAY_DEVICE_PRIMARY_DEVICE && */DispDev.StateFlags & DISPLAY_DEVICE_ATTACHED_TO_DESKTOP)
    {
        qDebug() << "Display Name: " << DispDev.DeviceName << "Display key: " << DispDev.DeviceKey << "Display ID: " << DispDev.DeviceID << "Display status: " << DispDev.StateFlags;
    }
}

// 根据上面拿到的设备名来调整分辨率
DEVMODEA lpDevMode;
ZeroMemory(&lpDevMode, sizeof(lpDevMode));
lpDevMode.dmSize = sizeof(lpDevMode);
if(EnumDisplaySettingsExA(DeviceName, ENUM_CURRENT_SETTINGS, &lpDevMode, 0))
{
    lpDevMode.dmPelsWidth	= 1920;
    lpDevMode.dmPelsHeight	= 1080;
    // 先修改到注册表
    LONG result = ChangeDisplaySettingsA(&lpDevMode, CDS_FULLSCREEN);
    if (result == DISP_CHANGE_SUCCESSFUL)
    {
        // 使用CDS_UPDATEREGISTRY表示次修改是持久的
        ChangeDisplaySettingsExA(DeviceName, &lpDevMode, NULL, CDS_UPDATEREGISTRY, NULL);
    }
    else
    {
        // 修改失败，恢复原有设置
        ChangeDisplaySettingsA(NULL, 0);
    }
}