c++ - 是否可以从 Windows 对象管理器路径获取 HMONITOR 句柄？

Question

我有一条看起来像这样的路径:

\\?\DISPLAY#IVM1A3E#5&1778d8b3&1&UID260#{e6f07b5f-ee97-4a90-b076-33f57bf4eaa7}

我想从中得到一个 HMONITOR handle .

使用 WinObj我可以在 GLOBAL 下看到？？它是指向某些 \Device\<number> 的符号链接(symbolic link).

我将如何做这样的事情？

编辑:

路径可以分为三部分。首先是\\?\前缀，然后是第二个 DISPLAY#IVM1A3E#5&1778d8b3&1&UID260如果#被 \ 取代它与 device instance ID 相同.第三{e6f07b5f-ee97-4a90-b076-33f57bf4eaa7}是GUID for Monitor devices .

通过设备实例 ID，我可以使用 CM_Get_Child 遍历设备树和 CM_Get_Sibling ，使用 CM_Get_Device_ID 检查设备名称.但这只给了我一个 DEVINST不是HMONITOR .

Answer 1

您可以使用 Connecting and configuring displays (CCD) API ，尤其是 The QueryDisplayConfig function它检索有关当前设置中所有显示设备或 View 的所有可能显示路径的信息。

使用以下代码，您将获得设备路径和监视器(及其句柄)之间的对应关系。

#include <Windows.h>
#include <stdio.h>
#include <vector>
#include <tuple>
#include <string>

int main()
{
    // get all paths
    UINT pathCount;
    UINT modeCount;
    if (GetDisplayConfigBufferSizes(QDC_ONLY_ACTIVE_PATHS, &pathCount, &modeCount))
        return 0;

    std::vector<DISPLAYCONFIG_PATH_INFO> paths(pathCount);
    std::vector<DISPLAYCONFIG_MODE_INFO> modes(modeCount);
    if (QueryDisplayConfig(QDC_ONLY_ACTIVE_PATHS, &pathCount, paths.data(), &modeCount, modes.data(), nullptr))
        return 0;

    // enum all monitors => (handle, device name)>
    std::vector<std::tuple<HMONITOR, std::wstring>> monitors;
    EnumDisplayMonitors(nullptr, nullptr, [](HMONITOR hmon, HDC hdc, LPRECT rc, LPARAM lp)
    {
        MONITORINFOEX mi = {};
        mi.cbSize = sizeof(MONITORINFOEX);
        GetMonitorInfo(hmon, &mi);
        auto monitors = (std::vector<std::tuple<HMONITOR, std::wstring>>*)lp;
        monitors->push_back({ hmon, mi.szDevice });
        return TRUE;
    }, (LPARAM)&monitors);

    // for each path, get GDI device name and compare with monitor device name
    for (UINT i = 0; i < pathCount; i++)
    {
        DISPLAYCONFIG_TARGET_DEVICE_NAME deviceName = {};
        deviceName.header.type = DISPLAYCONFIG_DEVICE_INFO_GET_TARGET_NAME;
        deviceName.header.size = sizeof(DISPLAYCONFIG_TARGET_DEVICE_NAME);
        deviceName.header.adapterId = paths[i].targetInfo.adapterId;
        deviceName.header.id = paths[i].targetInfo.id;
        if (DisplayConfigGetDeviceInfo((DISPLAYCONFIG_DEVICE_INFO_HEADER*)&deviceName))
            continue;

        wprintf(L"Monitor Friendly Name : %s\n", deviceName.monitorFriendlyDeviceName);
        wprintf(L"Monitor Device Path   : %s\n", deviceName.monitorDevicePath);

        DISPLAYCONFIG_SOURCE_DEVICE_NAME sourceName = {};
        sourceName.header.type = DISPLAYCONFIG_DEVICE_INFO_GET_SOURCE_NAME;
        sourceName.header.size = sizeof(DISPLAYCONFIG_SOURCE_DEVICE_NAME);
        sourceName.header.adapterId = paths[i].targetInfo.adapterId;
        sourceName.header.id = paths[i].sourceInfo.id;
        if (DisplayConfigGetDeviceInfo((DISPLAYCONFIG_DEVICE_INFO_HEADER*)&sourceName))
            continue;

        wprintf(L"GDI Device Name       : %s\n", sourceName.viewGdiDeviceName);

        // find the monitor with this device name
        auto mon = std::find_if(monitors.begin(), monitors.end(), [&sourceName](std::tuple<HMONITOR, std::wstring> t)
        {
            return !std::get<1>(t).compare(sourceName.viewGdiDeviceName);
        });
        wprintf(L"Monitor Handle        : %p\n", std::get<0>(*mon));
        wprintf(L"\n");
    }
    return 0;
}

在我的 PC(有 2 个显示器)上，它会输出如下内容:

Monitor Friendly Name : C27HG7x
Monitor Device Path   : \\?\DISPLAY#SAM0E16#7&307b5912&0&UID1024#{e6f07b5f-ee97-4a90-b076-33f57bf4eaa7}
GDI Device Name       : \\.\DISPLAY2
Monitor Handle        : 0000000000160045

Monitor Friendly Name : DELL U2715H
Monitor Device Path   : \\?\DISPLAY#DELD069#7&307b5912&0&UID1028#{e6f07b5f-ee97-4a90-b076-33f57bf4eaa7}
GDI Device Name       : \\.\DISPLAY1
Monitor Handle        : 0000000000020083

请注意，您也可以使用 WinRT 的 DisplayManager class 获得相同的信息。 => DisplayView class => Paths property , DisplayPath class , => Target property => TryGetMonitor function