得到程序当前UAC的执行权限，高 - 中 - 低

 1 DWORD GetIntegrityLevel() 
 2 { 
 3  DWORD Result = 0;
 4  if(!IsVista()) return Result;
 5  HANDLE hToken; 
 6  HANDLE hProcess;
 7  DWORD dwLengthNeeded; 
 8  DWORD dwError = ERROR_SUCCESS;
 9  PTOKEN_MANDATORY_LABEL pTIL = NULL; 
10  DWORD dwIntegrityLevel;
11  hProcess = GetCurrentProcess(); 
12  if (OpenProcessToken(hProcess, TOKEN_QUERY | TOKEN_QUERY_SOURCE, &hToken))  
13  { 
14   if (!GetTokenInformation(hToken, (::TOKEN_INFORMATION_CLASS)TokenIntegrityLevel, NULL, 0, &dwLengthNeeded)) 
15   { 
16    dwError = GetLastError(); 
17    if (dwError == ERROR_INSUFFICIENT_BUFFER) 
18    { 
19     pTIL = (PTOKEN_MANDATORY_LABEL)LocalAlloc(0, dwLengthNeeded); 
20     if (pTIL != NULL) 
21     { 
22      if (GetTokenInformation(hToken, (::TOKEN_INFORMATION_CLASS)TokenIntegrityLevel, pTIL, dwLengthNeeded, &dwLengthNeeded)) 
23      { 
24       dwIntegrityLevel = *GetSidSubAuthority(pTIL->Label.Sid,  
25        (DWORD)(UCHAR)(*GetSidSubAuthorityCount(pTIL->Label.Sid)-1));
26       if (dwIntegrityLevel < SECURITY_MANDATORY_MEDIUM_RID) 
27       { 
28        Result = IL_LOW;          
29         MessageBox(0,"low","low",MB_OK);
30       } 
31       else if (dwIntegrityLevel >= SECURITY_MANDATORY_MEDIUM_RID &&  
32        dwIntegrityLevel < SECURITY_MANDATORY_HIGH_RID) 
33       { 
34        Result = IL_MEDIUM; 
35         MessageBox(0,"MEDIUM","MEDIUM",MB_OK);
36       } 
37       else if (dwIntegrityLevel >= SECURITY_MANDATORY_HIGH_RID) 
38       { 
39        Result = IL_HIGH; 
40         MessageBox(0,"HIGH","HIGH",MB_OK);
41       } 
42      }
43      LocalFree(pTIL); 
44     } 
45    } 
46   } 
47   CloseHandle(hToken); 
48  }
49  return Result; 
50 }