如何在多个监视器中正确使用SetDisplayConfig？
如何在多个监视器中正确使用SetDisplayConfig？
提问于 2019-07-21 20:10:58
我正在创建一个小程序，它将包括所有桌面显示(扩展模式)或禁用所有辅助显示(显示可以连接到gpus和集成图形)。
这个程序是为Windows7编写的，所以我依赖于互联网上的信息，决定使用SetDisplayConfig API，但是()函数出现了一个问题。例如，这段关闭所有辅助显示的代码工作得很好，因为'i‘递增了一个显示：
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，我找到了以下代码：
SetDisplayConfig(0, NULL, 0, NULL, SDC_TOPOLOGY_EXTEND | SDC_APPLY);这个函数具有这个特定的参数，但它只针对我的第二个显示器，它是作为我的主显示器与gpu相连的，而不是第三个与主板相连的显示器(只有在我从gpu中断掉第二个显示器后，这个功能才能与主板相连的显示器一起工作)。
我试着用
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);
}
}但接收ERROR_ADAP_HDW_ERR错误
所以我请求帮助我。如何使用带有“SetDisplayConfig”标志的SDC_TOPOLOGY_EXTEND()功能将特定的显示(或所有显示同时)作为目标，或者有另一种解决此问题的方法？
回答 1
Stack Overflow用户
回答已采纳
发布于 2020-05-27 08:42:33
所以我做了它，它不工作一些外来的显示设置(如多个usb显示器)，但它可以工作，所有的显示器被添加到桌面(或桌面是分散到所有显示器)。
我是怎么做到的？微软绕道帮助我，通过监视windows 10中的哪些系统设置，当我将显示器添加到桌面时，它只是将最重要的属性设置为默认值。评论部分只在win 10上工作。
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));
}页面原文内容由Stack Overflow提供。腾讯云小微IT领域专用引擎提供翻译支持
原文链接：
https://stackoverflow.com/questions/57136638
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