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
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// 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;
}
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输出:
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32bit Program Files: C:\\Program Files (x86)
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参考
SHGetSpecialFolderPath function
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