Windows下c++获取物理磁盘的性能指标

Question

我想获取的是物理磁盘的性能指标：IO延迟、读IO/s、写IO/s、读KB/s、写KB/s、读error/s、写error/s(物理磁盘是disk0、disk1这种，不是c盘d盘这玩意)

Answer 1

你列的这些，有些是获取不了的，哪些能获取可以参考电脑自带的“性能监视器”
代码获取示例：

#include <windows.h>
#include <stdio.h>
#include <pdh.h>
#include <locale.h>
#include <wchar.h>
#include <stdlib.h>

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

typedef struct query_context{
    int count;
    PDH_HQUERY query;    
    PDH_HCOUNTER counter[20];
}query_context;

static query_context context_[16];
static WCHAR instance_names[4096]; 

//性能计数器名称，需要采集哪几个就在这里添加， 全部名称可通过list_counter_name()获取， 或通过系统自带“性能监视器”获取
static LPCWSTR counter_names_[] = {
    L"Disk Reads/sec",
    L"Disk Writes/sec",    
    L"Disk Read Bytes/sec",
    L"Disk Write Bytes/sec",        
    L"% Disk Time",    
};

//性能计数器对应显示名称
static LPCWSTR names_[] = {
    L"读次数/秒",
    L"写次数/秒",    
    L"读字节数/秒",
    L"写字节数/秒",        
    L"磁盘活动时间",    
};

#define check(exp,msg) if(!(exp)){printf("Error:%s\n",msg);exit(1);}

static void list_counter_name(){    
    WCHAR counter_names[4096];
    DWORD instance_length = 4096;
    DWORD counter_length = 4096;
    LPCWSTR counter_name;    
    PdhEnumObjectItemsW(NULL,NULL,L"PhysicalDisk",counter_names,&counter_length,instance_names,&instance_length,PERF_DETAIL_WIZARD,0);
    for(counter_name = counter_names; *counter_name; counter_name += (wcslen(counter_name) + 1)){
        wprintf(L"%ls\n", counter_name);
    }
}

static PDH_HCOUNTER add_counter(PDH_HQUERY query, LPCWSTR instance, LPCWSTR name){
    WCHAR path[1024];    
    PDH_HCOUNTER counter;
    PDH_STATUS stat;    
    _snwprintf(path, 1024, L"\\PhysicalDisk(%ls)\\%ls", instance, name);    
    stat = PdhAddCounterW(query, path, (DWORD_PTR)NULL, &counter);
     if(stat)return NULL;
    return counter;
}

static void get_disk_performance(LPCWSTR instance, int index){
    PDH_HQUERY query;
    PDH_HCOUNTER* counter;
    PDH_FMT_COUNTERVALUE value;    
    PDH_STATUS stat;    
    int i, count = 0;
    counter = context_[index].counter;
    query = context_[index].query;
    count = context_[index].count;
    if(!query){
        stat = PdhOpenQuery(NULL, (DWORD_PTR)NULL, &query); check(stat == 0, "PdhOpenQuery");
        context_[index].query = query;    
        for    (i=0; i<sizeof(counter_names_)/sizeof(LPCWSTR); i++){
            counter[count ++] = add_counter(query, instance, counter_names_[i]);     
        }
        context_[index].count = count;
    }
    wprintf(L"磁盘%d: (%ls)\n", index, instance);
    PdhCollectQueryData(query);
    for (i = 0; i < count; i++){        
        stat = PdhGetFormattedCounterValue(counter[i], PDH_FMT_DOUBLE, NULL, &value);        
        if(stat){
            wprintf(L"%ls 首次未采集\n", names_[i]);
        }else{
            wprintf(L"%ls %f\n", names_[i], value.doubleValue);
        }        
    }
    printf("\n");    
}

static void get_status(){    
    LPCWSTR instance ;
    int i = 0;
    for(instance = instance_names; *instance; instance += (wcslen(instance) + 1)){
        if(wcscmp(instance, L"_Total") == 0)continue;
        get_disk_performance(instance, i);
        i ++;
    }
}

int wmain(){
    setlocale(LC_ALL,"");    
    list_counter_name();    
    while(1){
        get_status();
        Sleep(1000);
        system("cls");
    }
    return 0;
}