GetApp32SystemDirectory

getsystemdir.cpp

// Win32.cpp : 定义控制台应用程序的入口点。
//

#include <stdio.h>
#include <tchar.h>



// TODO: 在此处引用程序需要的其他头文件
#include <windows.h>

//PathFileExists
#include <shlwapi.h>
#pragma comment(lib, "shlwapi.lib")

//SHGetSpecialFolderPath, SHGetFolderPath 
#include <Shlobj.h>
#pragma comment(lib, "Shell32.lib")

// For a 32-bit application, GetSystemDirectory() always gives the same result(e.g. C:\Windows\system32) on both 32bit and 64bit Windows.
// In order to get a real path: Use SHGetFolderPath or SHGetSpecialFolderPath to retrieve the "System32" directory on 32bit and the "SysWOW64" directory on 64bit.
// @see http://stackoverflow.com/questions/3540930/getting-syswow64-directory-using-32-bit-application
#ifdef _WIN32
#define CSIDL_SYSTEM_DIR CSIDL_SYSTEMX86 // 0x0029, x86 system directory on RISC
#else
#define CSIDL_SYSTEM_DIR CSIDL_SYSTEM // 0x0025, GetSystemDirectory()
#endif 

int _tmain(int argc, _TCHAR* argv[])
{
	TCHAR szDir[MAX_PATH], szRealDir[MAX_PATH];
	UINT uLength;

	PVOID OldValue = NULL;

	//https://msdn.microsoft.com/en-us/library/windows/desktop/bb762181.aspx
	//Windows 2000 Professional, Windows XP Shell32.dll (version 5.0 or later)
	if(SUCCEEDED(SHGetFolderPath(NULL, CSIDL_SYSTEM_DIR, NULL, 0, szDir))) 
	{
		_tprintf(TEXT("SHGetFolderPath: %s\n"), szDir);
	}

	//https://msdn.microsoft.com/en-us/library/windows/desktop/bb762204(v=vs.85).aspx
	//From Windows 2000 Professional Shell32.dll (version 4.71 or later)
	SHGetSpecialFolderPath(NULL, szDir, CSIDL_SYSTEM_DIR, FALSE);
	_tprintf(TEXT("SHGetSpecialFolderPath: %s\n"), szDir);

	//  Disable redirection immediately prior to the native API function call.
	if( Wow64DisableWow64FsRedirection (&OldValue) ) 
	{
		// Copy to the buffer, terminating null character.
		// return length in TCHARs, not including the terminating null character.
		uLength = GetSystemDirectory(szDir, _countof(szDir));
		_tprintf(TEXT("GetSystemDirectory: %s\n"), szDir);

		//  Immediately re-enable redirection. Note that any resources
		//  associated with OldValue are cleaned up by this call.
		if ( FALSE == Wow64RevertWow64FsRedirection(OldValue) )
		{
			//  Failure to re-enable redirection should be considered
			//  a criticial failure and execution aborted.
		}
	}
	

	GetSystemWow64Directory(szDir, _countof(szDir));
	_tprintf(TEXT("GetSystemWow64Directory: %s\n"), szDir);

	uLength = GetFullPathName(szDir, _countof(szRealDir), szRealDir, NULL);
	if (uLength == 0) 
	{
		// Handle an error condition.
		printf ("GetFullPathName failed (%d)\n", GetLastError());
	}
	else 
	{
		_tprintf(TEXT("The full path name is:  %s\n"), szRealDir);
	}
	
	// C:\Windows\SysWOW64 is not safe but it's currently ok.
	LPCTSTR pszSysWow64OnlyOn64 = TEXT("C:\\Windows\\SysWOW64");
	PathFileExists(pszSysWow64OnlyOn64);
	_tprintf(TEXT("%d = PathFileExists(%s)\n"), PathFileExists(pszSysWow64OnlyOn64), pszSysWow64OnlyOn64);

	getchar();
	return uLength;
}