如何在多台显示器上正确使用 SetDisplayConfig？

Question

我正在创建一个小程序，它将包括桌面中的所有显示器（扩展模式）或禁用所有辅助显示器（显示器可以连接到 gpus 和集成显卡）。

此程序适用于 Windows 7，因此根据互联网上的信息，我决定使用 CCD API，但遇到了 SetDisplayConfig() 函数的问题。例如，这段关闭所有辅助显示器的代码工作得很好，因为 'i' 递增其中一个显示器关闭：

    UINT32 PathCount = 0;  //path count
    UINT32 ModeCount = 0;  //mode count
    HRESULT hr;
    hr = GetDisplayConfigBufferSizes(QDC_ALL_PATHS, &PathCount, &ModeCount);
    std::vector<DISPLAYCONFIG_PATH_INFO> pathArray(PathCount);
    std::vector<DISPLAYCONFIG_MODE_INFO> modeArray(ModeCount);
    hr = QueryDisplayConfig(QDC_ALL_PATHS, &PathCount, &pathArray[0], &ModeCount, &modeArray[0], NULL);

    for (int i = 1; i < PathCount;i++)
    {
        if(pathArray[i].flags != 0)
        {
            pathArray[i].flags = 0;
            hr = SetDisplayConfig(PathCount, &pathArray[0], ModeCount, &modeArray[0], SDC_APPLY | SDC_USE_SUPPLIED_DISPLAY_CONFIG | SDC_ALLOW_CHANGES);
        }
    }

为了扩展显示，我找到了这段代码：

SetDisplayConfig(0, NULL, 0, NULL, SDC_TOPOLOGY_EXTEND | SDC_APPLY);

具有此特定参数的此功能有效，但它仅针对连接到 gpu 作为我的主显示器的我的第二个显示器，而不是连接到主板的第三个显示器（仅在我从物理上断开我的第二个显示器之后） gpu，此功能适用于连接到主板的显示器。

我尝试使用

    for (int i = 1; i < PathCount;i++)
    {
        if(pathArray[i].flags != 1)
        {
            pathArray[i].flags = 1;
            hr = SetDisplayConfig(PathCount, &pathArray[0], ModeCount, &modeArray[0], SDC_TOPOLOGY_EXTEND | SDC_APPLY | SDC_PATH_PERSIST_IF_REQUIRED);
        }
    }

但收到 ERROR_ADAP_HDW_ERR 错误

所以我请求帮助我。如何使用带有 'SDC_TOPOLOGY_EXTEND' 标志的 SetDisplayConfig() 功能定位特定显示器（或一次所有显示器），或者有另一种方法来解决此问题？

Answer 1

所以我做到了，它不适用于一些奇特的显示设置（如多个 usb 显示器），但它可以工作，并且所有显示器都添加到桌面（或者桌面被拉伸到所有显示器）

我是怎么做到的？ Microsoft 绕道帮助我，通过监视 windows 10 中的系统设置，当我将显示添加到桌面时，它只是将最重要的属性设置为默认值。评论部分仅适用于 win 10。

HRESULT hr = S_OK;
    UINT32 NumPathArrayElements = 0;
    UINT32 NumModeInfoArrayElements = 0;
    //LONG error = GetDisplayConfigBufferSizes((QDC_ALL_PATHS | QDC_VIRTUAL_MODE_AWARE), &NumPathArrayElements, &NumModeInfoArrayElements);
    hr = GetDisplayConfigBufferSizes((QDC_ALL_PATHS), &NumPathArrayElements, &NumModeInfoArrayElements);
    std::vector<DISPLAYCONFIG_PATH_INFO> PathInfoArray2(NumPathArrayElements);
    std::vector<DISPLAYCONFIG_MODE_INFO> ModeInfoArray2(NumModeInfoArrayElements);
    //error = QueryDisplayConfig((QDC_ALL_PATHS | QDC_VIRTUAL_MODE_AWARE), &NumPathArrayElements, &PathInfoArray2[0], &NumModeInfoArrayElements, &ModeInfoArray2[0], NULL);
    hr = QueryDisplayConfig((QDC_ALL_PATHS), &NumPathArrayElements, &PathInfoArray2[0], &NumModeInfoArrayElements, &ModeInfoArray2[0], NULL);

    struct displaySourcePair
    {
        std::wstring displayName;
        UINT32 displayId;
    };

    std::vector<displaySourcePair> ocupiedDisplays;

    if (hr == S_OK)
    {

        DISPLAYCONFIG_SOURCE_DEVICE_NAME SourceName = {};
        SourceName.header.type = DISPLAYCONFIG_DEVICE_INFO_GET_SOURCE_NAME;
        SourceName.header.size = sizeof(SourceName);

        DISPLAYCONFIG_TARGET_PREFERRED_MODE PreferedMode = {};
        PreferedMode.header.type = DISPLAYCONFIG_DEVICE_INFO_GET_TARGET_PREFERRED_MODE;
        PreferedMode.header.size = sizeof(PreferedMode);


        int newId = 0;


        for (UINT32 i = 0; i < NumPathArrayElements; i++)
        {
            bool match = false;
            SourceName.header.adapterId = PathInfoArray2[i].sourceInfo.adapterId;
            SourceName.header.id = PathInfoArray2[i].sourceInfo.id;

            PreferedMode.header.adapterId = PathInfoArray2[i].targetInfo.adapterId;
            PreferedMode.header.id = PathInfoArray2[i].targetInfo.id;

            hr = HRESULT_FROM_WIN32(DisplayConfigGetDeviceInfo(&SourceName.header));
            hr = HRESULT_FROM_WIN32(DisplayConfigGetDeviceInfo(&PreferedMode.header));

            if (hr == S_OK)
            {

                if ((PathInfoArray2[i].flags & DISPLAYCONFIG_PATH_ACTIVE) == true)
                {
                    std::wstring str = std::wstring(SourceName.viewGdiDeviceName);
                    displaySourcePair tmpStruct;
                    tmpStruct.displayId = PreferedMode.header.id;
                    tmpStruct.displayName = str;
                    ocupiedDisplays.push_back(tmpStruct);
                }

                for (int k = 0; k < ocupiedDisplays.size(); k++)
                {
                    std::wstring str = std::wstring(SourceName.viewGdiDeviceName);
                    if (ocupiedDisplays[k].displayName == str || ocupiedDisplays[k].displayId == PreferedMode.header.id)
                    {
                        match = true;
                    }
                }

                if (match == false && PathInfoArray2[i].targetInfo.targetAvailable == 1)
                {
                    PathInfoArray2[i].flags |= DISPLAYCONFIG_PATH_ACTIVE;
                    std::wstring str = std::wstring(SourceName.viewGdiDeviceName);
                    displaySourcePair tmpStruct;
                    tmpStruct.displayId = PreferedMode.header.id;
                    tmpStruct.displayName = str;
                    ocupiedDisplays.push_back(tmpStruct);
                }

                if (PathInfoArray2[i].targetInfo.targetAvailable == 1)
                {
                    PathInfoArray2[i].sourceInfo.id = newId;
                    newId++;
                }

                if (PathInfoArray2[i].targetInfo.id != PreferedMode.header.id)
                {
                    PathInfoArray2[i].targetInfo.id = PreferedMode.header.id;
                }

                PathInfoArray2[i].sourceInfo.modeInfoIdx = DISPLAYCONFIG_PATH_MODE_IDX_INVALID;
                PathInfoArray2[i].targetInfo.modeInfoIdx = DISPLAYCONFIG_PATH_MODE_IDX_INVALID;
            }
        }

        //hr = SetDisplayConfig(NumPathArrayElements, &PathInfoArray2[0], 0, NULL, (SDC_VALIDATE | SDC_TOPOLOGY_SUPPLIED | SDC_ALLOW_PATH_ORDER_CHANGES | SDC_VIRTUAL_MODE_AWARE));
        //hr = SetDisplayConfig(NumPathArrayElements, &PathInfoArray2[0], 0, NULL, (SDC_APPLY | SDC_TOPOLOGY_SUPPLIED | SDC_ALLOW_PATH_ORDER_CHANGES | SDC_VIRTUAL_MODE_AWARE));
        hr = SetDisplayConfig(NumPathArrayElements, &PathInfoArray2[0], 0, NULL, (SDC_VALIDATE | SDC_TOPOLOGY_SUPPLIED | SDC_ALLOW_PATH_ORDER_CHANGES));
        hr = SetDisplayConfig(NumPathArrayElements, &PathInfoArray2[0], 0, NULL, (SDC_APPLY | SDC_TOPOLOGY_SUPPLIED | SDC_ALLOW_PATH_ORDER_CHANGES));
    }

如何在多台显示器上正确使用 SetDisplayConfig？

How to properly use SetDisplayConfig with multiple monitors?

c++

winapi

multiple-monitors