????????
????1.??Windows 64bit????????????? ?Щ???????ж?Program Files·???? ????64bit????????Program Files?? Program Files(x86)?? ??????????????????λ???????·????.
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????1.????ж??????32bit??64bit?????????????64bit??????????32bit??64bit????.
????2.64bit????kernel32.dll ?????????????? IsWow64Process???????ж????dll????????????????????.
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// test-OSBit.cpp : ??????????ó????????
//
#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)