用c++代码获取本机带宽使用占比，不使用GetPerTcpConnectionEStats、MIB_IF_ROW2

你可以使用Windows Performance Counters来获取本机带宽使用占比。下面是一个获取网络传输速率的示例代码：

#include <Windows.h>
#include <iostream>

int main()
{
    PDH_STATUS status;
    PDH_HQUERY query;
    PDH_HCOUNTER counterTx, counterRx;
    PDH_FMT_COUNTERVALUE valueTx, valueRx;
    ULONGLONG lastTx = 0, lastRx = 0;
    ULONGLONG currentTx, currentRx;
    double txRate, rxRate;

    status = PdhOpenQuery(NULL, NULL, &query);
    if (status != ERROR_SUCCESS) {
        std::cerr << "PdhOpenQuery failed with error " << status << std::endl;
        return 1;
    }

    status = PdhAddCounter(query, L"\\Network Interface(*)\\Bytes Sent/sec", NULL, &counterTx);
    if (status != ERROR_SUCCESS) {
        std::cerr << "PdhAddCounter (TX) failed with error " << status << std::endl;
        return 1;
    }

    status = PdhAddCounter(query, L"\\Network Interface(*)\\Bytes Received/sec", NULL, &counterRx);
    if (status != ERROR_SUCCESS) {
        std::cerr << "PdhAddCounter (RX) failed with error " << status << std::endl;
        return 1;
    }

    status = PdhCollectQueryData(query);
    if (status != ERROR_SUCCESS) {
        std::cerr << "PdhCollectQueryData failed with error " << status << std::endl;
        return 1;
    }

    Sleep(1000);

    status = PdhCollectQueryData(query);
    if (status != ERROR_SUCCESS) {
        std::cerr << "PdhCollectQueryData failed with error " << status << std::endl;
        return 1;
    }

    status = PdhGetFormattedCounterValue(counterTx, PDH_FMT_LARGE, NULL, &valueTx);
    if (status != ERROR_SUCCESS) {
        std::cerr << "PdhGetFormattedCounterValue (TX) failed with error " << status << std::endl;
        return 1;
    }
    currentTx = valueTx.largeValue;

    status = PdhGetFormattedCounterValue(counterRx, PDH_FMT_LARGE, NULL, &valueRx);
    if (status != ERROR_SUCCESS) {
        std::cerr << "PdhGetFormattedCounterValue (RX) failed with error " << status << std::endl;
        return 1;
    }
    currentRx = valueRx.largeValue;

    txRate = (currentTx - lastTx) / 1024.0;
    rxRate = (currentRx - lastRx) / 1024.0;

    std::cout << "TX Rate: " << txRate << " KB/s" << std::endl;
    std::cout << "RX Rate: " << rxRate << " KB/s" << std::endl;

    lastTx = currentTx;
    lastRx = currentRx;

    PdhCloseQuery(query);

    return 0;
}

该代码使用了Windows的性能计数器来获取网络接口的传输速率。你可以根据需要修改计数器路径以获取其他信息。注意，在实际应用中，你可能需要更复杂的逻辑来计算带宽使用占比。