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使用C语言获取系统架构

1. 使用GetNativeSystemInfo获取系统架构

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

BOOL Is64BitOS()
{
     SYSTEM_INFO stInfo = { 0 };
     GetNativeSystemInfo(&stInfo);
     if (stInfo.wProcessorArchitecture == PROCESSOR_ARCHITECTURE_IA64
         || stInfo.wProcessorArchitecture == PROCESSOR_ARCHITECTURE_AMD64)
     {
         return TRUE;
     }

    return FALSE;
}
int main()
{
    if (Is64BitOS())
        printf("x64\n");
    else
        printf("x86\n");
    return 0;
}

2.加载动态库里的GetNativeSystemInfo

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

BOOL Is64BitOS()
{
    typedef VOID(WINAPI* LPFN_GetNativeSystemInfo)(__out LPSYSTEM_INFO lpSystemInfo);
    LPFN_GetNativeSystemInfo fnGetNativeSystemInfo = (LPFN_GetNativeSystemInfo)GetProcAddress(GetModuleHandleA("kernel32"), "GetNativeSystemInfo");
    if (fnGetNativeSystemInfo)
    {
        SYSTEM_INFO stInfo = { 0 };
        fnGetNativeSystemInfo(&stInfo);
        if (stInfo.wProcessorArchitecture == PROCESSOR_ARCHITECTURE_IA64
            || stInfo.wProcessorArchitecture == PROCESSOR_ARCHITECTURE_AMD64)
        {
            return TRUE;
        }
    }
    return FALSE;
}
int main()
{
    if (Is64BitOS())
        printf("x64\n");
    else
        printf("x86\n");
    return 0;
}

3.判断进程是32位还是64位

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#include <windows.h>
#include <stdio.h>
#include <TlHelp32.h>  

BOOL IsWow64(HANDLE hProcess)
{
    typedef BOOL(WINAPI* LPFN_ISWOW64PROCESS) (HANDLE, PBOOL);
    LPFN_ISWOW64PROCESS fnIsWow64Process;

    BOOL bIsWow64 = FALSE;
    fnIsWow64Process = (LPFN_ISWOW64PROCESS)GetProcAddress(
        GetModuleHandleA("kernel32"), "IsWow64Process");

    if (NULL != fnIsWow64Process)
    {
        fnIsWow64Process(hProcess, &bIsWow64);
    }
    return bIsWow64;
}

DWORD processNameToId(LPCTSTR lpszProcessName)
{
    HANDLE hSnapshot = CreateToolhelp32Snapshot(TH32CS_SNAPPROCESS, 0);
    PROCESSENTRY32W pe;
    pe.dwSize = sizeof(PROCESSENTRY32W);
    if (!Process32FirstW(hSnapshot, &pe)) {
        MessageBoxA(NULL,
            "The frist entry of the process list has not been copyied to the buffer", "Notice", MB_ICONINFORMATION | MB_OK);
        return 0;
    }
    while (Process32NextW(hSnapshot, &pe)) {
        if (!wcscmp(lpszProcessName, pe.szExeFile)) {
            return pe.th32ProcessID;
        }
    }
    return 0;
}

int main()
{
    BOOL bWow64;
    wchar_t* szExeName = L"Notepad.exe";
    DWORD dwProcessId = processNameToId(szExeName);
    if (dwProcessId == 0) {
        MessageBoxA(NULL, "The target process have not been found !", "Notice", MB_ICONINFORMATION | MB_OK);
        return -1;
    }
    HANDLE hTargetProcess = OpenProcess(PROCESS_ALL_ACCESS, FALSE, dwProcessId);
    if (!hTargetProcess) {
        MessageBoxA(NULL, "Open target process failed !",
            "Notice", MB_ICONINFORMATION | MB_OK);
        return 0;
    }
    bWow64 = IsWow64(hTargetProcess);

    if (bWow64)
        printf("32-bit process\n");
    else
        printf("64-bit process\n");
}