C/C++ 获取Windows系统的位数32位或64位的实现代码

场景

1.在Windows 64bit系统开发程序时, 某些情况需要判断Program Files路径, 但是64bit系统有两个Program Files或 Program Files(x86), 这时候就需要根据当前系统的位数来获取路径了.

说明

1.通过判断程序是32bit或64bit并没有什么用,因为64bit系统可以运行32bit和64bit程序.

2.64bit系统的kernel32.dll 里有一个函数接口 IsWow64Process,只需要判断这个dll是否有这个导出函数即可.

例子

// 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;}

输出:

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

参考

SHGetSpecialFolderPath function

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