Check Windows is x64 or not

main.cpp

//
// ref:https://stackoverflow.com/questions/7011071/detect-32-bit-or-64-bit-of-windows
//

#include <windows.h>
#include <shlwapi.h>
#pragma comment(lib, "shlwapi.lib")

bool is_x64_system() {
    if (sizeof(void*) == 8) {
        return true;
    }
    SYSTEM_INFO si = { 0 };
    GetNativeSystemInfo(&si);
    return  ((si.wProcessorArchitecture & PROCESSOR_ARCHITECTURE_IA64)
        || (si.wProcessorArchitecture & PROCESSOR_ARCHITECTURE_AMD64))
        ? true : false;
}

bool is_x64_system2() {
    if (sizeof(void*) == 8) {
        return true;
    }
    BOOL isWow64 = FALSE;
    IsWow64Process(GetCurrentProcess(), &isWow64);
    return isWow64 ? true : false;
}

bool is_x64_system3() {
    if (sizeof(void*) == 8) {
        return true;
    }
    char szDir[MAX_PATH] = { 0 };
    auto ret = GetSystemWow64DirectoryA(szDir, MAX_PATH);
    if (ret == 0 && GetLastError() == ERROR_CALL_NOT_IMPLEMENTED) {
        return false;
    }
    return true;
}

bool is_x64_system4() {
    if (sizeof(void*) == 8) {
        return true;
    }

    FILE *file;
    if ((file = _popen("systeminfo", "r")) != NULL) {
        char cmd[1024] = { 0 };
        while (fgets(cmd, 1024, file) != NULL) {
            // printf("%s\n", cmd);
            if (StrStrIA(cmd, "x64-based PC")) {
                _pclose(file);
                return true;
            }
            if (StrStrIA(cmd, "x86-based PC")) {
                _pclose(file);
                return false;
            }
        }
        _pclose(file);
    }
    return false;
}

int main() {
    printf("1) is_x64=%s\n", is_x64_system() ? "YES" : "NO");
    printf("2) is_x64=%s\n", is_x64_system2() ? "YES" : "NO");
    printf("3) is_x64=%s\n", is_x64_system3() ? "YES" : "NO");
    printf("4) is_x64=%s\n", is_x64_system4() ? "YES" : "NO");

    return 0;
}