C/C++ 獲取Windows系統(tǒng)的位數(shù)32位或64位的實現(xiàn)代碼
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場景
1.在Windows 64bit系統(tǒng)開發(fā)程序時, 某些情況需要判斷Program Files路徑, 但是64bit系統(tǒng)有兩個Program Files或 Program Files(x86), 這時候就需要根據(jù)當前系統(tǒng)的位數(shù)來獲取路徑了.
說明
1.通過判斷程序是32bit或64bit并沒有什么用,因為64bit系統(tǒng)可以運行32bit和64bit程序.
2.64bit系統(tǒng)的kernel32.dll 里有一個函數(shù)接口 IsWow64Process,只需要判斷這個dll是否有這個導(dǎo)出函數(shù)即可.
例子
// test-OSBit.cpp : 定義控制臺應(yīng)用程序的入口點。 // #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; }
輸出:
32bit Program Files: C:\Program Files (x86)
參考
SHGetSpecialFolderPath function
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