有时候需要在工程里面获取一些系统或者硬件的信息，比如系统版本，cpu，内存，显卡，硬盘等，作为后续软件功能判断的依据，甚至参与性能算法自适应建模
Windows
操作系统和内存信息在windows下通过系统的API来获取，CPU信息则需要需要通过底层CPUID指令取得
代码：
- #include <iostream>
- #include <string>
- #include <windows.h>
- #pragma warning(disable: 4996) // avoid GetVersionEx to be warned
- // ***** global macros ***** //
- static const int kMaxInfoBuffer = 256;
- #define GBYTES 1073741824
- #define MBYTES 1048576
- #define KBYTES 1024
- #define DKBYTES 1024.0
- // ---- get os info ---- //
- void getOsInfo()
- {
- // get os name according to version number
- OSVERSIONINFO osver = {sizeof(OSVERSIONINFO)};
- GetVersionEx(&osver);
- std::string os_name;
- if (osver.dwMajorVersion == 5 && osver.dwMinorVersion == 0)
- os_name = "Windows 2000";
- else if (osver.dwMajorVersion == 5 && osver.dwMinorVersion == 1)
- os_name = "Windows XP";
- else if (osver.dwMajorVersion == 6 && osver.dwMinorVersion == 0)
- os_name = "Windows 2003";
- else if (osver.dwMajorVersion == 5 && osver.dwMinorVersion == 2)
- os_name = "windows vista";
- else if (osver.dwMajorVersion == 6 && osver.dwMinorVersion == 1)
- os_name = "windows 7";
- else if (osver.dwMajorVersion == 6 && osver.dwMinorVersion == 2)
- os_name = "windows 10";
- std::cout << "os name: " << os_name << std::endl;
- std::cout << "os version: " << osver.dwMajorVersion << '.' << osver.dwMinorVersion << std::endl;
- }
- // ---- get cpu info ---- //
- // save 4 register variables
- DWORD deax;
- DWORD debx;
- DWORD decx;
- DWORD dedx;
- // init cpu in assembly language
- void initCpu(DWORD veax)
- {
- __asm
- {
- mov eax, veax
- cpuid
- mov deax, eax
- mov debx, ebx
- mov decx, ecx
- mov dedx, edx
- }
- }
- long getCpuFreq()
- {
- int start, over;
- _asm
- {
- RDTSC
- mov start, eax
- }
- Sleep(50);
- _asm
- {
- RDTSC
- mov over, eax
- }
- return (over - start) / 50000;
- }
- std::string getManufactureID()
- {
- char manuID[25];
- memset(manuID, 0, sizeof(manuID));
- initCpu(0);
- memcpy(manuID + 0, &debx, 4); // copy to array
- memcpy(manuID + 4, &dedx, 4);
- memcpy(manuID + 8, &decx, 4);
- return manuID;
- }
- std::string getCpuType()
- {
- const DWORD id = 0x80000002; // start 0x80000002 end to 0x80000004
- char cpuType[49];
- memset(cpuType, 0, sizeof(cpuType));
- for (DWORD t = 0; t < 3; t++)
- {
- initCpu(id + t);
- memcpy(cpuType + 16 * t + 0, &deax, 4);
- memcpy(cpuType + 16 * t + 4, &debx, 4);
- memcpy(cpuType + 16 * t + 8, &decx, 4);
- memcpy(cpuType + 16 * t + 12, &dedx, 4);
- }
- return cpuType;
- }
- void getCpuInfo()
- {
- std::cout << "CPU main frequency: " << getCpuFreq() << "MHz" << std::endl;
- std::cout << "CPU manufacture: " << getManufactureID() << std::endl;
- std::cout << "CPU type: " << getCpuType() << std::endl;
- }
- // ---- get memory info ---- //
- void getMemoryInfo()
- {
- std::string memory_info;
- MEMORYSTATUSEX statusex;
- statusex.dwLength = sizeof(statusex);
- if (GlobalMemoryStatusEx(&statusex))
- {
- unsigned long long total = 0, remain_total = 0, avl = 0, remain_avl = 0;
- double decimal_total = 0, decimal_avl = 0;
- remain_total = statusex.ullTotalPhys % GBYTES;
- total = statusex.ullTotalPhys / GBYTES;
- avl = statusex.ullAvailPhys / GBYTES;
- remain_avl = statusex.ullAvailPhys % GBYTES;
- if (remain_total > 0)
- decimal_total = (remain_total / MBYTES) / DKBYTES;
- if (remain_avl > 0)
- decimal_avl = (remain_avl / MBYTES) / DKBYTES;
- decimal_total += (double)total;
- decimal_avl += (double)avl;
- char buffer[kMaxInfoBuffer];
- sprintf_s(buffer, kMaxInfoBuffer, "total %.2f GB (%.2f GB available)", decimal_total, decimal_avl);
- memory_info.append(buffer);
- }
- std::cout << memory_info << std::endl;
- }
- int main(int argc, char *argv[])
- {
- std::cout << "===os information===" << std::endl;
- getOsInfo();
- std::cout << "===cpu infomation===" << std::endl;
- getCpuInfo();
- std::cout << "===memory information===" << std::endl;
- getMemoryInfo();
- system("pause");
- return 0;
- }
结果：
- ===os information===
- os name: windows 10
- os version: 6.2
- ===cpu infomation===
- CPU main frequency: 2612MHz
- CPU manufacture: GenuineIntel
- CPU type: Intel(R) Core(TM) i5-3230M CPU @ 2.60GHz
- ===memory information===
- total 7.86 GB (1.38 GB available)
Linux
linux下很多信息都是存放着系统的/proc目录下，因此读文件就可以获取到了
代码：
- #include <stdio.h>
- #include <stdlib.h>
- #include <string.h>
- // read the linux config files to get system info
- void getOsInfo()
- {
- FILE *fp = fopen("/proc/version", "r");
- if(NULL == fp)
- printf("failed to open version\n");
- char szTest[1000] = {0};
- while(!feof(fp))
- {
- memset(szTest, 0, sizeof(szTest));
- fgets(szTest, sizeof(szTest) - 1, fp); // leave out \n
- printf("%s", szTest);
- }
- fclose(fp);
- }
- void getCpuInfo()
- {
- FILE *fp = fopen("/proc/cpuinfo", "r");
- if(NULL == fp)
- printf("failed to open cpuinfo\n");
- char szTest[1000] = {0};
- // read file line by line
- while(!feof(fp))
- {
- memset(szTest, 0, sizeof(szTest));
- fgets(szTest, sizeof(szTest) - 1, fp); // leave out \n
- printf("%s", szTest);
- }
- fclose(fp);
- }
- void getMemoryInfo()
- {
- FILE *fp = fopen("/proc/meminfo", "r");
- if(NULL == fp)
- printf("failed to open meminfo\n");
- char szTest[1000] = {0};
- while(!feof(fp))
- {
- memset(szTest, 0, sizeof(szTest));
- fgets(szTest, sizeof(szTest) - 1, fp);
- printf("%s", szTest);
- }
- fclose(fp);
- }
- int main(int argc, char **argv)
- {
- printf("===os information===\n");
- getOsInfo();
- printf("===cpu infomation===\n");
- getCpuInfo();
- printf("===memory information===\n");
- getMemoryInfo();
- return 0;
- }
结果：
- ===os information===
- Linux version 4.8.6-300.fc25.x86_64 (mockbuild@bkernel02.phx2.fedoraproject.org) (gcc version 6.2.1 20160916 (Red Hat 6.2.1-2) (GCC) ) #1 SMP Tue Nov 1 12:36:38 UTC 2016
- ===cpu infomation===
- processor : 0
- vendor_id : GenuineIntel
- cpu family : 6
- model : 58
- model name : Intel(R) Core(TM) i5-3230M CPU @ 2.60GHz
- stepping : 9
- microcode : 0x1b
- cpu MHz : 2599.755
- cache size : 3072 KB
- ===memory information===
- MemTotal: 3061552 kB
- MemFree: 89584 kB
- MemAvailable: 596876 kB
- Buffers: 70372 kB
- Cached: 707548 kB
- SwapCached: 392 kB
PS：硬盘和网络参数也可以通过这种方法拿到，显卡参数可以用制造商提供的驱动API来取得
