###程序如何知道当前用哪个用户来运行？[有点难]

Question

程序如何知道当前用哪个用户来运行？程序可能被桌面用户启动，也可能被IIS的访客用户启动，也可能被SYSTEM来
启动。如何知道当前被哪个用户启动呢？或者说正在以哪个身份来运行？

Answer 1

http://www.vckbase.com/document/viewdoc/?id=1241//获取进程的用户名  
  BOOL   CSecurityTool::GetProcessUser(DWORD   dwProcessID,   TCHAR   *szUserName,   DWORD   nNameLen)  
  {  
  BOOL   fResult     =   FALSE;  
          HANDLE   hProc     =   NULL;  
  HANDLE   hToken   =   NULL;  
  TOKEN_USER   *pTokenUser   =   NULL;  
   
  __try  
  {  
                  //   Open   the   process   with   PROCESS_QUERY_INFORMATION   access  
                  hProc   =   OpenProcess(PROCESS_QUERY_INFORMATION,   FALSE,   dwProcessID);  
                  if   (hProc   ==   NULL)  
  {  
  __leave;  
  }  
                  fResult   =   OpenProcessToken(hProc,   TOKEN_QUERY,   &hToken);  
                  if(!fResult)      
  {  
  __leave;  
  }  
   
  DWORD   dwNeedLen   =   0;  
  fResult   =   GetTokenInformation(hToken,TokenUser,   NULL,   0,   &dwNeedLen);  
  if   (dwNeedLen   >   0)  
  {  
  pTokenUser   =   (TOKEN_USER*)new   BYTE[dwNeedLen];  
  fResult   =   GetTokenInformation(hToken,  
                                                              TokenUser,  
                                                              pTokenUser,  
                                                              dwNeedLen,  
                                                              &dwNeedLen);  
  if   (!fResult)  
  {  
  __leave;  
  }  
  }  
  else  
  {  
  __leave;  
  }  
   
  SID_NAME_USE   sn;  
  TCHAR   szDomainName[MAX_PATH];  
  DWORD   dwDmLen   =   MAX_PATH;  
  fResult   =   LookupAccountSid(NULL,  
                                                        pTokenUser->User.Sid,  
                                                        szUserName,  
                                                        &nNameLen,  
                                                                        szDomainName,  
                                                                        &dwDmLen,  
                                                                        &sn);  
  }  
  __finally  
  {  
  if   (hProc)  
  ::CloseHandle(hProc);  
  if   (hToken)  
  ::CloseHandle(hToken);  
  if   (pTokenUser)  
  delete[]   (char*)pTokenUser;  
   
  return   fResult;  
  }  
  }