判断OS位数

    #include <Windows.h>        
    #include <stdio.h>  
    #include <tchar.h>  
    #include <conio.h>  
      
      
    // 取得真实系统信息  
    VOID SafeGetNativeSystemInfo(__out LPSYSTEM_INFO lpSystemInfo)  
    {  
        if (NULL==lpSystemInfo)    return;  
        typedef VOID (WINAPI *LPFN_GetNativeSystemInfo)(LPSYSTEM_INFO lpSystemInfo);  
        LPFN_GetNativeSystemInfo fnGetNativeSystemInfo = (LPFN_GetNativeSystemInfo)GetProcAddress( GetModuleHandle(_T("kernel32")), "GetNativeSystemInfo");;  
        if (NULL != fnGetNativeSystemInfo)  
        {  
            fnGetNativeSystemInfo(lpSystemInfo);  
        }  
        else  
        {  
            GetSystemInfo(lpSystemInfo);  
        }  
    }  
      
    // 获取操作系统位数  
    int GetSystemBits()  
    {  
        SYSTEM_INFO si;  
        SafeGetNativeSystemInfo(&si);  
         if (si.wProcessorArchitecture == PROCESSOR_ARCHITECTURE_AMD64 ||  
            si.wProcessorArchitecture == PROCESSOR_ARCHITECTURE_IA64 )  
        {  
            return 64;  
        }  
        return 32;  
    }  
      
    int _tmain(int argc, _TCHAR* argv[])  
    {  
        const int nBitCode = GetProgramBits();  
        const int nBitSys = GetSystemBits();  
        _tprintf(_T("I am a %dbit Program, run on %dbit System."), nBitCode, nBitSys);  
        //  
        _getch();  
        return 0;  
    }  

//-----------------------------------------------------
//判断OS位数
BOOL Is64BitOS()
{
    typedef VOID (WINAPI *LPFN_GetNativeSystemInfo)( __out LPSYSTEM_INFO lpSystemInfo );
    LPFN_GetNativeSystemInfo fnGetNativeSystemInfo = (LPFN_GetNativeSystemInfo)GetProcAddress( GetModuleHandleW(L"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;
}

//判断windows进程位数
BOOL Is64BitPorcess(DWORD dwProcessID)
{
    if (!Is64BitOS())
    {
        return FALSE;
    }else
    {
        HANDLE hProcess = OpenProcess(PROCESS_QUERY_INFORMATION,FALSE,dwProcessID);
        if(hProcess)
        {
            typedef BOOL (WINAPI *LPFN_ISWOW64PROCESS) (HANDLE, PBOOL);
            LPFN_ISWOW64PROCESS fnIsWow64Process = (LPFN_ISWOW64PROCESS)GetProcAddress( GetModuleHandleW(L"kernel32"),"IsWow64Process");
            if (NULL != fnIsWow64Process)
            {
                BOOL bIsWow64 = FALSE;
                fnIsWow64Process(hProcess,&bIsWow64);
                CloseHandle(hProcess);
                if (bIsWow64)
                {
                    return FALSE;
                }
                else
                {
                    return TRUE;
                }
            }
        }
    }
    return FALSE;
}

　

//查看errorCode表示的具体Message
	HKEY hKey = NULL;
	LPCTSTR subKey = LPCTSTR("SOFTWARE\\Microsoft\\Windows NT\\CurrentVersion\\setup\\recoveryconsole");
	long errorCode = 0;
	
	errorCode = RegOpenKeyEx(HKEY_LOCAL_MACHINE, subKey, NULL, KEY_READ | KEY_WOW64_64KEY, &hKey);
	
	TCHAR *buffer;
	::FormatMessage(
		FORMAT_MESSAGE_ALLOCATE_BUFFER | FORMAT_MESSAGE_FROM_SYSTEM,
		NULL,
		errorCode,
		0,
		(LPTSTR)&buffer,
		0,
		NULL);
	::MessageBox(NULL, buffer, NULL, 0);
	LocalFree(buffer);