下面是一个简单示例,展示了如何为 Common App Data 文件夹 (CSIDL_COMMON_APPDATA) 中的所有用户创建具有读/写权限的文件和文件夹。任何用户都可以运行此代码以授予所有其他用户写入文件和文件夹的权限:
#include <windows.h>
#include <shlobj.h>
#pragma comment(lib, "shell32.lib")
// for PathAppend
#include <Shlwapi.h>
#pragma comment(lib, "Shlwapi.lib")
#include <stdio.h>
#include <aclapi.h>
#include <tchar.h>
#pragma comment(lib, "advapi32.lib")
#include <iostream>
#include <fstream>
using namespace std;
int _tmain(int argc, _TCHAR* argv[])
{
DWORD dwRes, dwDisposition;
PSID pEveryoneSID = NULL;
PACL pACL = NULL;
PSECURITY_DESCRIPTOR pSD = NULL;
EXPLICIT_ACCESS ea;
SID_IDENTIFIER_AUTHORITY SIDAuthWorld = SECURITY_WORLD_SID_AUTHORITY;
SID_IDENTIFIER_AUTHORITY SIDAuthNT = SECURITY_NT_AUTHORITY;
SECURITY_ATTRIBUTES sa;
// Create a well-known SID for the Everyone group.
if (!AllocateAndInitializeSid(&SIDAuthWorld, 1,
SECURITY_WORLD_RID, 0, 0, 0, 0, 0, 0, 0,
&pEveryoneSID))
{
_tprintf(_T("AllocateAndInitializeSid Error %u\n"), GetLastError());
goto Cleanup;
}
// Initialize an EXPLICIT_ACCESS structure for an ACE.
// The ACE will allow Everyone access to files & folders you create.
ZeroMemory(&ea, sizeof(EXPLICIT_ACCESS));
ea.grfAccessPermissions = 0xFFFFFFFF;
ea.grfAccessMode = SET_ACCESS;
// both folders & files will inherit this ACE
ea.grfInheritance= CONTAINER_INHERIT_ACE|OBJECT_INHERIT_ACE;
ea.Trustee.TrusteeForm = TRUSTEE_IS_SID;
ea.Trustee.TrusteeType = TRUSTEE_IS_WELL_KNOWN_GROUP;
ea.Trustee.ptstrName = (LPTSTR) pEveryoneSID;
// Create a new ACL that contains the new ACEs.
dwRes = SetEntriesInAcl(1, &ea, NULL, &pACL);
if (ERROR_SUCCESS != dwRes)
{
_tprintf(_T("SetEntriesInAcl Error %u\n"), GetLastError());
goto Cleanup;
}
// Initialize a security descriptor.
pSD = (PSECURITY_DESCRIPTOR) LocalAlloc(LPTR, SECURITY_DESCRIPTOR_MIN_LENGTH);
if (NULL == pSD)
{
_tprintf(_T("LocalAlloc Error %u\n"), GetLastError());
goto Cleanup;
}
if (!InitializeSecurityDescriptor(pSD, SECURITY_DESCRIPTOR_REVISION))
{
_tprintf(_T("InitializeSecurityDescriptor Error %u\n"), GetLastError());
goto Cleanup;
}
// Add the ACL to the security descriptor.
if (!SetSecurityDescriptorDacl(pSD,
TRUE, // bDaclPresent flag
pACL,
FALSE)) // not a default DACL
{
_tprintf(_T("SetSecurityDescriptorDacl Error %u\n"), GetLastError());
goto Cleanup;
}
// Initialize a security attributes structure.
sa.nLength = sizeof(SECURITY_ATTRIBUTES);
sa.lpSecurityDescriptor = pSD;
sa.bInheritHandle = FALSE;
TCHAR szPath[MAX_PATH];
if (SUCCEEDED(SHGetFolderPath(NULL, CSIDL_COMMON_APPDATA|CSIDL_FLAG_CREATE, NULL, 0, szPath)))
{
PathAppend(szPath, TEXT("Your Shared Folder"));
if (!CreateDirectory(szPath, &sa)
&& GetLastError() != ERROR_ALREADY_EXISTS)
{
goto Cleanup;
}
PathAppend(szPath, TEXT("textitup.txt"));
HANDLE hFile = CreateFile(szPath, GENERIC_READ | GENERIC_WRITE, 0, &sa, CREATE_ALWAYS, 0, 0);
if (hFile == INVALID_HANDLE_VALUE)
goto Cleanup;
else
CloseHandle(hFile);
//TODO: do the writing
ofstream fsOut;
fsOut.exceptions(ios::eofbit | ios::failbit | ios::badbit);
fsOut.open(szPath, ios::out | ios::binary | ios::trunc);
fsOut << "Hello world!\n";
fsOut.close();
}
Cleanup:
if (pEveryoneSID)
FreeSid(pEveryoneSID);
if (pACL)
LocalFree(pACL);
if (pSD)
LocalFree(pSD);
return 0;
}