那么，是否真的没法在服务中弹出对话框了呢？对于服务进程自身来说，确实如此，操作系统已经把这条路堵上了。但是，我们想要的并不是“在服务进程中弹出对话框”，我们想要的不过是“当服务出现某些状况的时候，在桌面上弹出对话框”。既然在Session 0中无法弹出对话框，而我们看到的桌面是Session X，并非Session 0，很自然的一个想法是：能不能让Session 0通知其他的Session，让当前桌面正显示着的Session弹一个对话框呢？
幸运的是，还真可以这样做。
//for win7
DWORD _stdcall LaunchAppIntoDifferentSession( LPTSTR lpCommand )
{
DWORD dwRet = 0;
PROCESS_INFORMATION pi ;
STARTUPINFO si ;
DWORD dwSessionId ;
HANDLE hUserToken = NULL;
HANDLE hUserTokenDup = NULL;
HANDLE hPToken = NULL;
HANDLE hProcess = NULL;
DWORD dwCreationFlags ;
HMODULE hInstKernel32 = NULL;
typedef DWORD (WINAPI * WTSGetActiveConsoleSessionIdPROC)();
WTSGetActiveConsoleSessionIdPROC WTSGetActiveConsoleSessionId = NULL;
hInstKernel32 = LoadLibrary (L"Kernel32.dll" );
if (!hInstKernel32 )
{
return FALSE ;
}
OutputDebugString(L "LaunchAppIntoDifferentSession 1n" );
WTSGetActiveConsoleSessionId = (WTSGetActiveConsoleSessionIdPROC )GetProcAddress( hInstKernel32,"WTSGetActiveConsoleSessionId" );
// Log the client on to the local computer.
dwSessionId = WTSGetActiveConsoleSessionId ();
do
{
WTSQueryUserToken( dwSessionId ,&hUserToken );
dwCreationFlags = NORMAL_PRIORITY_CLASS | CREATE_NEW_CONSOLE;
ZeroMemory( &si , sizeof( STARTUPINFO ) );
si.cb = sizeof( STARTUPINFO );
si.lpDesktop = L"winsta0default" ;
ZeroMemory( &pi , sizeof( pi) );
TOKEN_PRIVILEGES tp ;
LUID luid ;
if( !::OpenProcessToken ( GetCurrentProcess(), TOKEN_ADJUST_PRIVILEGES | TOKEN_QUERY
| TOKEN_DUPLICATE | TOKEN_ASSIGN_PRIMARY | TOKEN_ADJUST_SESSIONID
| TOKEN_READ | TOKEN_WRITE , &hPToken ) )
{
dwRet = GetLastError ();
break;
}
else;
if ( !LookupPrivilegeValue ( NULL, SE_DEBUG_NAME, &luid ) )
{
dwRet = GetLastError ();
break;
}
else;
tp.PrivilegeCount =1;
tp.Privileges [0].Luid = luid;
tp.Privileges [0].Attributes = SE_PRIVILEGE_ENABLED;
if( !DuplicateTokenEx ( hPToken, MAXIMUM_ALLOWED, NULL , SecurityIdentification , TokenPrimary, & hUserTokenDup ) )
{
dwRet = GetLastError ();
break;
}
else;
//Adjust Token privilege
if( !SetTokenInformation ( hUserTokenDup,TokenSessionId ,(void*)& dwSessionId,sizeof (DWORD) ) )
{
dwRet = GetLastError ();
break;
}
else;
if( !AdjustTokenPrivileges ( hUserTokenDup, FALSE, &tp , sizeof(TOKEN_PRIVILEGES ), (PTOKEN_PRIVILEGES) NULL, NULL ) )
{
dwRet = GetLastError ();
break;
}
else;
LPVOID pEnv =NULL;
if( CreateEnvironmentBlock ( &pEnv, hUserTokenDup, TRUE ) )
{
dwCreationFlags|=CREATE_UNICODE_ENVIRONMENT ;
}
else pEnv =NULL;
// Launch the process in the client's logon session.
if( CreateProcessAsUser ( hUserTokenDup, // client's access token
NULL, // file to execute
lpCommand, // command line
NULL, // pointer to process SECURITY_ATTRIBUTES
NULL, // pointer to thread SECURITY_ATTRIBUTES
FALSE, // handles are not inheritable
dwCreationFlags,// creation flags
pEnv, // pointer to new environment block
NULL, // name of current directory
& si, // pointer to STARTUPINFO structure
& pi // receives information about new process
) )
{
}
else
{
dwRet = GetLastError ();
break;
}
}
while( 0 );
//Perform All the Close Handles task
if( NULL != hUserToken )
{
CloseHandle( hUserToken );
}
else;
if( NULL != hUserTokenDup)
{
CloseHandle( hUserTokenDup );
}
else;
if( NULL != hPToken )
{
CloseHandle( hPToken );
}
else;
return dwRet ;
}
