C/C++ 获取Windows系统的位数32位或64位的实现代码

// test-OSBit.cpp : 定义控制台应用程序的入口点。//#include "stdafx.h"#include <Windows.h>#include "Shlobj.h"#include <iostream>typedef BOOL (WINAPI *LPFN_ISWOW64PROCESS) (HANDLE, PBOOL);static LPFN_ISWOW64PROCESS fnIsWow64Process = NULL;////  FUNCTION: SafeIsWow64Process(HANDLE, PBOOL)////  PURPOSE: This is a wrapper of the IsWow64Process API. It determines //  whether the specified process is running under WOW64. IsWow64Process //  does not exist prior to Windows XP with SP2 and Window Server 2003 with //  SP1. For compatibility with operating systems that do not support //  IsWow64Process, call GetProcAddress to detect whether IsWow64Process is /// implemented in Kernel32.dll. If GetProcAddress succeeds, it is safe to //  call IsWow64Process dynamically. Otherwise, WOW64 is not present.////  PARAMETERS://  * hProcess - A handle to the process. //  * Wow64Process - A pointer to a value that is set to TRUE if the process //   is running under WOW64. If the process is running under 32-bit Windows, //   the value is set to FALSE. If the process is a 64-bit application //   running under 64-bit Windows, the value is also set to FALSE.////  RETURN VALUE: If the function succeeds, the return value is TRUE.If //  IsWow64Process does not exist in kernel32.dll, or the function fails, //  the return value is FALSE. //static BOOL WINAPI SafeIsWow64Process(HANDLE hProcess, PBOOL Wow64Process){  if (fnIsWow64Process == NULL)  {    // IsWow64Process is not available on all supported versions of     // Windows. Use GetModuleHandle to get a handle to the DLL that     // contains the function, and GetProcAddress to get a pointer to the     // function if available.    HMODULE hModule = GetModuleHandle(L"kernel32.dll");    if (hModule == NULL)    {      return FALSE;    }    fnIsWow64Process = reinterpret_cast<LPFN_ISWOW64PROCESS>(      GetProcAddress(hModule, "IsWow64Process"));    if (fnIsWow64Process == NULL)    {      return FALSE;    }  }  return fnIsWow64Process(hProcess, Wow64Process);}////  FUNCTION: Is64BitOS()////  PURPOSE: The function determines whether the current operating system is //  a 64-bit operating system.////  RETURN VALUE: The function returns TRUE if the operating system is //  64-bit; otherwise, it returns FALSE.//static BOOL Is64BitOS(){#if defined(_WIN64)  return TRUE;  // 64-bit programs run only on Win64#elif defined(_WIN32)  // 32-bit programs run on both 32-bit and 64-bit Windows  BOOL f64bitOS = FALSE;  return (SafeIsWow64Process(GetCurrentProcess(), &f64bitOS) && f64bitOS);#else  return FALSE; // 64-bit Windows does not support Win16#endif}int _tmain(int argc, _TCHAR* argv[]){  TCHAR folder[MAX_PATH] = {0};  if(Is64BitOS())    ::SHGetSpecialFolderPath(NULL,folder,CSIDL_PROGRAM_FILESX86,FALSE);  else    ::SHGetSpecialFolderPath(NULL,folder,CSIDL_PROGRAM_FILES,FALSE);  std::wcout << "32bit Program Files: " << folder << std::endl;  system("pause");  return 0;}

32bit Program Files: C:/Program Files (x86)