效果图

原理:

1. 调用汇编 cpuid指令
2. 调用 windows.h 的 GetSystemTimes

细节注意

1. malloc开辟的空间要在使用结束后用free回收，具体写法如下代码

代码

 // 代码出处我的开源项目： 
// 获取windows系统cpu信息与使用率实例

package main

/*
#include <stdio.h>
#include <conio.h>
#include <windows.h>

struct cpuid_result {
    DWORD eax;
    DWORD ebx;
    DWORD ecx;
    DWORD edx;
};

// 执行汇编cpuid
static inline struct cpuid_result cpuid(unsigned int op)
{
    struct cpuid_result result;
    __asm volatile(
        "mov %%ebx, %%edi;"
        "cpuid;"
        "mov %%ebx, %%esi;"
        "mov %%edi, %%ebx;"
        : "=a" (result.eax),
        "=S" (result.ebx),
        "=c" (result.ecx),
        "=d" (result.edx)
        : "0" (op)
        : "edi");
    return result;
}

static inline unsigned int cpuid_eax(unsigned int op)
{
    //unsigned int eax, ebx, ecx, edx;
    struct cpuid_result regs;

    regs = cpuid(op);

    return regs.eax;
}

void get_cpu_vendor(char* cpu_vendor, unsigned int* cpuid_level)
{
    unsigned int cpuid_op = 0x00000000;
    char vendor_name[16] = {'\0'};
    struct cpuid_result result;
    unsigned int level = 0;

    vendor_name[0] = '\0';
//eax为0表示读取vendor id，一共12字节，依次在ebx、edx、ecx。
    result = cpuid(cpuid_op);
    level = result.eax;
    vendor_name[0] = (result.ebx >> 0) & 0xff;
    vendor_name[1] = (result.ebx >> 8) & 0xff;
    vendor_name[2] = (result.ebx >> 16) & 0xff;
    vendor_name[3] = (result.ebx >> 24) & 0xff;
    vendor_name[4] = (result.edx >> 0) & 0xff;
    vendor_name[5] = (result.edx >> 8) & 0xff;
    vendor_name[6] = (result.edx >> 16) & 0xff;
    vendor_name[7] = (result.edx >> 24) & 0xff;
    vendor_name[8] = (result.ecx >> 0) & 0xff;
    vendor_name[9] = (result.ecx >> 8) & 0xff;
    vendor_name[10] = (result.ecx >> 16) & 0xff;
    vendor_name[11] = (result.ecx >> 24) & 0xff;
    vendor_name[12] = '\0';

    strcpy(cpu_vendor, vendor_name);
    *cpuid_level = level;
}

void get_cpu_id(char* cpu_id, unsigned int* cpu_sign)
{
    unsigned int cpuid_op = 0x00000001;
    struct cpuid_result result;
    unsigned int sign = 0, id = 0;
    unsigned int tmp = 0;

    result = cpuid(cpuid_op);
    sign = result.eax;
    id = result.edx;

    sprintf(cpu_id, "%02X-%02X-%02X-%02X-%02X-%02X-%02X-%02X", (sign >> 0) & 0xff, (sign >> 8) & 0xff, (sign >> 16) & 0xff, (sign >> 24) & 0xff,
        (id >> 0) & 0xff, (id >> 8) & 0xff, (id >> 16) & 0xff, (id >> 24) & 0xff);
    *cpu_sign = sign;
}

struct cpuinfo_x86 {
    //CPU family
DWORD    x86;

//CPU vendor
    DWORD    x86_vendor;

//CPU model
    DWORD    x86_model;

//CPU stepping
    DWORD    x86_step;
};

// 参考IA32开发手册第2卷第3章。CPUID exa==0x01的图3-6
static inline void get_fms(struct cpuinfo_x86 *c, DWORD tfms)
{
    c->x86 = (tfms >> 8) & 0xf;
    c->x86_model = (tfms >> 4) & 0xf;
    c->x86_step = tfms & 0xf;
    if (c->x86 == 0xf)
        c->x86 += (tfms >> 20) & 0xff;
    if (c->x86 >= 0x6)
        c->x86_model += ((tfms >> 16) & 0xF) << 4;
}

// 参考IA32开发手册第2卷第3章。CPUID exa==0x01的图3-6
void get_cpu_fms(unsigned int* family, unsigned int* model, unsigned int* stepping)
{
    unsigned int cpuid_op = 0x00000001;
    struct cpuinfo_x86 c;
    unsigned int ver = 0;

    ver = cpuid_eax(cpuid_op);
    get_fms(&c, ver);

    *family = c.x86;
    *model = c.x86_model;
    *stepping = c.x86_step;
}

void get_cpu_name(char* processor_name)
{
    unsigned int cpuid_op = 0x80000002;
    struct cpuid_result regs;
    char temp_processor_name[49];
    char* processor_name_start;
    unsigned int *name_as_ints = (unsigned int *)temp_processor_name;
    unsigned int i;

//用cpuid指令，eax传入0x80000002/0x80000003/0x80000004，
    //共3个，每个4个寄存器，每个寄存器4字节，故一共48字节。
    //参考IA32开发手册第2卷第3章。
    for (i = 0; i < 3; i++) {
        regs = cpuid(cpuid_op + i);
        name_as_ints[i * 4 + 0] = regs.eax;
        name_as_ints[i * 4 + 1] = regs.ebx;
        name_as_ints[i * 4 + 2] = regs.ecx;
        name_as_ints[i * 4 + 3] = regs.edx;
    }

    temp_processor_name[49] = '\0'; // 最后的字节为0，结束

    processor_name_start = temp_processor_name;
    while (*processor_name_start == ' ')
        processor_name_start++;

    memset(processor_name, 0, 49);
    strcpy(processor_name, processor_name_start);
}

void get_address_bits(unsigned int* linear, unsigned int* physical)
{
    unsigned int cpuid_op = 0x80000008;
    unsigned int tmp = 0;
    tmp = cpuid_eax(cpuid_op);
    *linear = (tmp >> 8) & 0xff;
    *physical = (tmp >> 0) & 0xff;

}

char* WindowsGetCpuVendorId(){
char* vendor_id;
vendor_id = (char *)malloc(49);
char buffer[49] = { '\0' };
    unsigned int num = 0;
memset((void *)buffer, '\0', sizeof(buffer));
get_cpu_vendor(buffer,#);
strcpy(vendor_id, buffer);
return vendor_id;
}

char* WindowsGetCpuId(){
char* id;
id = (char *)malloc(49);
char buffer[49] = { '\0' };
    unsigned int num = 0;
memset((void *)buffer, '\0', sizeof(buffer));
get_cpu_id(buffer,#);
strcpy(id, buffer);
return id;
}

char* WindowsGetCpuName(){
char* name;
name = (char *)malloc(100);
get_cpu_name(name);
return name;
}

double FileTimeToDouble(FILETIME* pFiletime)
{
return (double)((*pFiletime).dwHighDateTime * 4.294967296E9) + (double)(*pFiletime).dwLowDateTime;
}

double m_fOldCPUIdleTime;
double m_fOldCPUKernelTime;
double m_fOldCPUUserTime;

BOOL Initialize()
{
FILETIME ftIdle, ftKernel, ftUser;
BOOL flag = FALSE;
if (flag = GetSystemTimes(&ftIdle, &ftKernel, &ftUser))
{
m_fOldCPUIdleTime = FileTimeToDouble(&ftIdle);
m_fOldCPUKernelTime = FileTimeToDouble(&ftKernel);
m_fOldCPUUserTime = FileTimeToDouble(&ftUser);

}
return flag;
}

//获取cpu使用
int GetCPUUseRate()
{
int nCPUUseRate = -1;
FILETIME ftIdle, ftKernel, ftUser;
if (GetSystemTimes(&ftIdle, &ftKernel, &ftUser))
{
double fCPUIdleTime = FileTimeToDouble(&ftIdle);
double fCPUKernelTime = FileTimeToDouble(&ftKernel);
double fCPUUserTime = FileTimeToDouble(&ftUser);
nCPUUseRate= (int)(100.0 - (fCPUIdleTime - m_fOldCPUIdleTime) / (fCPUKernelTime - m_fOldCPUKernelTime + fCPUUserTime - m_fOldCPUUserTime)*100.0);
m_fOldCPUIdleTime = fCPUIdleTime;
m_fOldCPUKernelTime = fCPUKernelTime;
m_fOldCPUUserTime = fCPUUserTime;
}
return nCPUUseRate;
}

//获取cpu使用
int cpu()
{
if (!Initialize())
{
getch();
return -1;
}
else
{
Sleep(1000);
return GetCPUUseRate();
}
return -1;
}
*/import "C"
import (
"log"
"unsafe"
)

//获取cpu的VendorId
func GetCpuVendorId() string {
//定义一个字符串指针接收C 函数返回值
var out *C.char = C.WindowsGetCpuVendorId()
//释放这个指针  前提是使用了malloc
defer C.free(unsafe.Pointer(out))
return C.GoString(out)
}

//获取cpu的 CpuId
func GetCpuId() string {
var out *C.char = C.WindowsGetCpuId()
defer C.free(unsafe.Pointer(out))
return C.GoString(out)
}

//获取cup的 CpuName
func GetCpuName() string {
var out *C.char = C.WindowsGetCpuName()
defer C.free(unsafe.Pointer(out))
return C.GoString(out)
}

//获取cpu使用率
func GetCPUUse() int {
return int(C.cpu())

}

func main() {
log.Println("CPU ID : ", GetCpuId())
log.Println("CPU VendorId : ", GetCpuVendorId())
log.Println("CPU Name : ", GetCpuName())
log.Println("CPU Use : ", GetCPUUse())
}

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