如何获取显示器连接在显卡的哪个DP接口上

Question

如何获取显示器连接在显卡的哪个DP接口上？我尝试过WMI和D3D
D3D只可以知道有多少接口已连接：

    DXGI_ADAPTER_DESC adapterDesc;
    pAdapter->GetDesc(&adapterDesc);
    m_AdapterInfos.insert(std::pair<int, DXGI_ADAPTER_DESC>(iAdapterIndex, adapterDesc));//保存显卡信息
    std::cout << "\nDP:" << iAdapterIndex << "," << adapterDesc.Description;
    //输出设备
    IDXGIOutput* pOutput = nullptr;
    //输出设备数量
    int iOutputNum = 0;
    std::map<int, DXGI_OUTPUT_DESC> outputs;
    while (pAdapter->EnumOutputs(iOutputNum, &pOutput) != DXGI_ERROR_NOT_FOUND) {
        if (!pOutput) {
            std::cout << "\n\Output:" << iOutputNum << "0";
            break;
        }
        DXGI_OUTPUT_DESC outputDesc;
        pOutput->GetDesc(&outputDesc);
        outputs.insert(std::pair<int, DXGI_OUTPUT_DESC>(iOutputNum, outputDesc));
        iOutputNum++;
        //pOutput->Release();
        //pOutput = nullptr;
        std::cout << "\n\Output:" << iOutputNum << "||" << outputDesc.DesktopCoordinates.right - outputDesc.DesktopCoordinates.left << "x" << outputDesc.DesktopCoordinates.bottom - outputDesc.DesktopCoordinates.top;
    }

WMI似乎没有显卡连接口的类

Answer 1

// 使用 Windows API 来获取显示器连接在显卡的哪个DP接口上

#include <windows.h>
#include <stdio.h>

// 获取显示器连接在显卡的哪个DP接口上
int GetDPPort()
{
    DISPLAY_DEVICE displayDevice;
    displayDevice.cb = sizeof(DISPLAY_DEVICE);

    int index = 0;
    while (EnumDisplayDevices(NULL, index, &displayDevice, 0))
    {
        if (displayDevice.StateFlags & DISPLAY_DEVICE_ACTIVE)
        {
            DEVMODE devMode;
            devMode.dmSize = sizeof(DEVMODE);
            devMode.dmDriverExtra = 0;

            if (EnumDisplaySettingsEx(displayDevice.DeviceName, ENUM_CURRENT_SETTINGS, &devMode, 0))
            {
                if (devMode.dmFields & DM_DISPLAYFLAGS)
                {
                    if (devMode.u2.dmDisplayFlags & DM_DISPLAYFLAGS_DP_PORT)
                    {
                        return devMode.u2.dmDisplayFlags & DM_DISPLAYFLAGS_DP_PORT_MASK;
                    }
                }
            }
        }
        index++;
    }
    return -1;
}

int main()
{
    int port = GetDPPort();
    if (port != -1)
    {
        printf("Display is connected to DP port %d\n", port);
    }
    else
    {
        printf("Display is not connected to a DP port\n");
    }
    return 0;
}