c++ 获取cpu温度

在C语言中获取CPU温度需要调用操作系统提供的API，因为不同操作系统提供的API不同，所以获取CPU温度的方法也会有所不同。

在Windows系统中，可以使用WMI（Windows Management Instrumentation）来获取CPU温度。具体的代码如下：

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

#pragma comment(lib, "wbemuuid.lib")

int main()
{
    HRESULT hres;

    // 初始化COM库
    hres = CoInitializeEx(0, COINIT_MULTITHREADED); 
    if (FAILED(hres))
    {
        printf("Failed to initialize COM library. Error code = 0x%x\n", hres);
        return 1;
    }

    // 设置COM库的安全级别
    hres = CoInitializeSecurity(
        NULL,
        -1,                          
        NULL,                        
        NULL,                        
        RPC_C_AUTHN_LEVEL_DEFAULT,   
        RPC_C_IMP_LEVEL_IMPERSONATE, 
        NULL,                        
        EOAC_NONE,                   
        NULL                         
    );
    if (FAILED(hres))
    {
        printf("Failed to initialize security. Error code = 0x%x\n", hres);
        CoUninitialize();
        return 1;
    }

    // 创建WMI服务
    IWbemLocator* pLoc = NULL;
    hres = CoCreateInstance(
        CLSID_WbemLocator,             
        0,                             
        CLSCTX_INPROC_SERVER,           
        IID_IWbemLocator,              
        (LPVOID*)&pLoc                 
    );
    if (FAILED(hres))
    {
        printf("Failed to create IWbemLocator object. Error code = 0x%x\n", hres);
        CoUninitialize();
        return 1;
    }

    // 连接WMI服务
    IWbemServices* pSvc = NULL;
    hres = pLoc->ConnectServer(
        _bstr_t(L"ROOT\\WMI"),   
        NULL,                   
        NULL,                   
        0,                      
        NULL,                   
        0,                      
        0,                      
        &pSvc                  
    );
    if (FAILED(hres))
    {
        printf("Could not connect. Error code = 0x%x\n", hres);
        pLoc->Release();
        CoUninitialize();
        return 1;
    }

    // 设置WMI服务的安全级别
    hres = CoSetProxyBlanket(
        pSvc,                      
        RPC_C_AUTHN_WINNT,         
        RPC_C_AUTHZ_NONE,          
        NULL,                      
        RPC_C_AUTHN_LEVEL_CALL,    
        RPC_C_IMP_LEVEL_IMPERSONATE, 
        NULL,                      
        EOAC_NONE                  
    );
    if (FAILED(hres))
    {
        printf("Could not set proxy blanket. Error code = 0x%x\n", hres);
        pSvc->Release();
        pLoc->Release();
        CoUninitialize();
        return 1;
    }

    // 构造WMI查询语句
    BSTR bstrQuery = SysAllocString(L"SELECT * FROM MSAcpi_ThermalZoneTemperature");
    BSTR bstrWQL = SysAllocString(L"WQL");
    IEnumWbemClassObject* pEnumerator = NULL;
    hres = pSvc->ExecQuery(
        bstrWQL,                        
        bstrQuery,                      
        WBEM_FLAG_FORWARD_ONLY | WBEM_FLAG_RETURN_IMMEDIATELY, 
        NULL,                          
        &pEnumerator                    
    );
    if (FAILED(hres))
    {
        printf("Query failed. Error code = 0x%x\n", hres);
        pSvc->Release();
        pLoc->Release();
        CoUninitialize();
        return 1;
    }

    // 获取查询结果
    IWbemClassObject* pclsObj = NULL;
    ULONG uReturn = 0;
    VARIANT vtProp;

    while (pEnumerator)
    {
        hres = pEnumerator->Next(WBEM_INFINITE, 1, &pclsObj, &uReturn);

        if (0 == uReturn)
        {
            break;
        }

        // 获取CPU温度
        hres = pclsObj->Get(L"CurrentTemperature", 0, &vtProp, 0, 0);
        if (FAILED(hres))
        {
            printf("Could not get CPU temperature. Error code = 0x%x\n", hres);
            pclsObj->Release();
            continue;
        }

        // 将温度值转换为摄氏度
        double temperature = vtProp.intVal / 10.0 - 273.15;

        // 输出温度值
        printf("CPU temperature: %.2f℃\n", temperature);

        VariantClear(&vtProp);
        pclsObj->Release();
    }

    // 释放资源
    pSvc->Release();
    pLoc->Release();
    pEnumerator->Release();
    CoUninitialize();

    return 0;
}

在Linux系统中，可以通过读取/sys/class/thermal/thermal_zone0/temp文件来获取CPU温度。具体的代码如下：

#include <stdio.h>

int main()
{
    FILE* fp = fopen("/sys/class/thermal/thermal_zone0/temp", "r");
    if (fp == NULL)
    {
        printf("Failed to open file.\n");
        return 1;
    }

    int temperature;
    fscanf(fp, "%d", &temperature);  // 读取温度值
    fclose(fp);

    // 将温度值转换为摄氏度
    double celsius = temperature / 1000.0;

    // 输出温度值
    printf("CPU temperature: %.2f℃\n", celsius);

    return 0;
}