我正在编写一个 Windows 服务，它将管理一些捕获屏幕截图的代理程序。代理程序运行良好，完全没有问题 - 它只是截取屏幕截图并将其保存到 bmp 文件中。 但是当我尝试从我的服务中执行这个代理程序时 - 它不起作用，我得到的只是黑色图片(就好像我试图直接从我的服务中捕获屏幕截图一样) 我的服务内部代码是:
ServiceStatus.dwCurrentState = SERVICE_RUNNING;
SetServiceStatus (hStatus, &ServiceStatus);
SHELLEXECUTEINFO seInfo;
seInfo.cbSize = sizeof(SHELLEXECUTEINFO);
seInfo.fMask = SEE_MASK_NOCLOSEPROCESS;
seInfo.hwnd = NULL;
seInfo.lpVerb = TEXT("open");
seInfo.lpFile = TEXT("D:\\dev\\work\\agent.exe");
seInfo.lpDirectory = TEXT("D:\\dev\\work\\");
seInfo.nShow = SW_SHOWNORMAL;
seInfo.hInstApp = NULL;
ShellExecuteEx(&seInfo);
我尝试更改服务属性 - 以允许它与桌面交互，将服务用户从 SYSTEM 更改为我的本地帐户 - 无济于事。 我该怎么做才能使其正常工作？
更新。好吧，我想，这是因为我的服务在 session0 中执行程序。我也尝试了 CreateProcess() 和 CreateProcessAsUser() - 没有结果。那么我如何才能创建不在 session0 中的进程呢？
最佳答案
Aliostad 为此承担了所有繁重的工作。看看他的代码，这是一个很好的开始。请记住，您需要一个单独的应用程序来截取屏幕截图，因为在模拟登录用户时必须启动一个新进程。 https://stackoverflow.com/a/4147868/125406
这是我的版本(完全基于 Aliostad 的代码)。它添加命令行参数，等待进程完成并返回退出代码。
public static class ProcessAsCurrentUser
{
/// <summary>
/// Connection state of a session.
/// </summary>
public enum ConnectionState
{
/// <summary>
/// A user is logged on to the session.
/// </summary>
Active,
/// <summary>
/// A client is connected to the session.
/// </summary>
Connected,
/// <summary>
/// The session is in the process of connecting to a client.
/// </summary>
ConnectQuery,
/// <summary>
/// This session is shadowing another session.
/// </summary>
Shadowing,
/// <summary>
/// The session is active, but the client has disconnected from it.
/// </summary>
Disconnected,
/// <summary>
/// The session is waiting for a client to connect.
/// </summary>
Idle,
/// <summary>
/// The session is listening for connections.
/// </summary>
Listening,
/// <summary>
/// The session is being reset.
/// </summary>
Reset,
/// <summary>
/// The session is down due to an error.
/// </summary>
Down,
/// <summary>
/// The session is initializing.
/// </summary>
Initializing
}
[StructLayout(LayoutKind.Sequential)]
class SECURITY_ATTRIBUTES
{
public int nLength;
public IntPtr lpSecurityDescriptor;
public int bInheritHandle;
}
[StructLayout(LayoutKind.Sequential, CharSet = CharSet.Unicode)]
struct STARTUPINFO
{
public Int32 cb;
public string lpReserved;
public string lpDesktop;
public string lpTitle;
public Int32 dwX;
public Int32 dwY;
public Int32 dwXSize;
public Int32 dwYSize;
public Int32 dwXCountChars;
public Int32 dwYCountChars;
public Int32 dwFillAttribute;
public Int32 dwFlags;
public Int16 wShowWindow;
public Int16 cbReserved2;
public IntPtr lpReserved2;
public IntPtr hStdInput;
public IntPtr hStdOutput;
public IntPtr hStdError;
}
[StructLayout(LayoutKind.Sequential)]
internal struct PROCESS_INFORMATION
{
public IntPtr hProcess;
public IntPtr hThread;
public int dwProcessId;
public int dwThreadId;
}
enum LOGON_TYPE
{
LOGON32_LOGON_INTERACTIVE = 2,
LOGON32_LOGON_NETWORK,
LOGON32_LOGON_BATCH,
LOGON32_LOGON_SERVICE,
LOGON32_LOGON_UNLOCK = 7,
LOGON32_LOGON_NETWORK_CLEARTEXT,
LOGON32_LOGON_NEW_CREDENTIALS
}
enum LOGON_PROVIDER
{
LOGON32_PROVIDER_DEFAULT,
LOGON32_PROVIDER_WINNT35,
LOGON32_PROVIDER_WINNT40,
LOGON32_PROVIDER_WINNT50
}
[Flags]
enum CreateProcessFlags : uint
{
CREATE_BREAKAWAY_FROM_JOB = 0x01000000,
CREATE_DEFAULT_ERROR_MODE = 0x04000000,
CREATE_NEW_CONSOLE = 0x00000010,
CREATE_NEW_PROCESS_GROUP = 0x00000200,
CREATE_NO_WINDOW = 0x08000000,
CREATE_PROTECTED_PROCESS = 0x00040000,
CREATE_PRESERVE_CODE_AUTHZ_LEVEL = 0x02000000,
CREATE_SEPARATE_WOW_VDM = 0x00000800,
CREATE_SHARED_WOW_VDM = 0x00001000,
CREATE_SUSPENDED = 0x00000004,
CREATE_UNICODE_ENVIRONMENT = 0x00000400,
DEBUG_ONLY_THIS_PROCESS = 0x00000002,
DEBUG_PROCESS = 0x00000001,
DETACHED_PROCESS = 0x00000008,
EXTENDED_STARTUPINFO_PRESENT = 0x00080000,
INHERIT_PARENT_AFFINITY = 0x00010000
}
[StructLayout(LayoutKind.Sequential)]
public struct WTS_SESSION_INFO
{
public int SessionID;
[MarshalAs(UnmanagedType.LPTStr)] public string WinStationName;
public ConnectionState State;
}
[DllImport("wtsapi32.dll", CharSet = CharSet.Auto, SetLastError = true)]
public static extern Int32 WTSEnumerateSessions(IntPtr hServer, int reserved, int version,
ref IntPtr sessionInfo, ref int count);
[DllImport("advapi32.dll", EntryPoint = "CreateProcessAsUserW", SetLastError = true, CharSet = CharSet.Auto)]
static extern bool CreateProcessAsUser(
IntPtr hToken,
string lpApplicationName,
string lpCommandLine,
IntPtr lpProcessAttributes,
IntPtr lpThreadAttributes,
bool bInheritHandles,
UInt32 dwCreationFlags,
IntPtr lpEnvironment,
string lpCurrentDirectory,
ref STARTUPINFO lpStartupInfo,
out PROCESS_INFORMATION lpProcessInformation);
[DllImport("kernel32.dll", SetLastError = true)]
public static extern Int32 WaitForSingleObject(IntPtr handle, Int32 wait);
public const Int32 INFINITE = -1;
public const Int32 WAIT_ABANDONED = 0x80;
public const Int32 WAIT_OBJECT_0 = 0x00;
public const Int32 WAIT_TIMEOUT = 0x102;
public const Int32 WAIT_FAILED = -1;
[DllImport("kernel32.dll", SetLastError = true)]
public static extern bool GetExitCodeProcess(IntPtr hProcess, out uint exitCode);
[DllImport("wtsapi32.dll")]
public static extern void WTSFreeMemory(IntPtr memory);
[DllImport("kernel32.dll")]
private static extern UInt32 WTSGetActiveConsoleSessionId();
[DllImport("wtsapi32.dll", SetLastError = true)]
static extern int WTSQueryUserToken(UInt32 sessionId, out IntPtr Token);
[DllImport("advapi32.dll", CharSet = CharSet.Auto, SetLastError = true)]
public extern static bool DuplicateTokenEx(
IntPtr hExistingToken,
uint dwDesiredAccess,
IntPtr lpTokenAttributes,
int ImpersonationLevel,
int TokenType,
out IntPtr phNewToken);
private const int TokenImpersonation = 2;
private const int SecurityIdentification = 1;
private const int MAXIMUM_ALLOWED = 0x2000000;
private const int TOKEN_DUPLICATE = 0x2;
private const int TOKEN_QUERY = 0x00000008;
/// <summary>
/// Launches a process for the current logged on user if there are any.
/// If none, return false as well as in case of
///
/// ##### !!! BEWARE !!! #### ------------------------------------------
/// This code will only work when running in a windows service (where it is really needed)
/// so in case you need to test it, it needs to run in the service. Reason
/// is a security privileg which only services have (SE_??? something, cant remember)!
/// </summary>
/// <param name="processExe"></param>
/// <returns></returns>
public static uint CreateProcessAsCurrentUser(string processExe, string commandLine)
{
IntPtr duplicate = new IntPtr();
STARTUPINFO info = new STARTUPINFO();
PROCESS_INFORMATION procInfo = new PROCESS_INFORMATION();
Debug.WriteLine(string.Format("CreateProcessAsCurrentUser. processExe: " + processExe));
IntPtr p = GetCurrentUserToken();
bool result = DuplicateTokenEx(p, MAXIMUM_ALLOWED | TOKEN_QUERY | TOKEN_DUPLICATE, IntPtr.Zero,
SecurityIdentification, SecurityIdentification, out duplicate);
Debug.WriteLine(string.Format("DuplicateTokenEx result: {0}", result));
Debug.WriteLine(string.Format("duplicate: {0}", duplicate));
if (result)
{
//NOTE: CREATE_NO_WINDOW will hide the console
//If there are commandline options, pass them AND the exe in
//commandLine and leave processExe empty.
result = CreateProcessAsUser(duplicate, processExe, commandLine,
// IntPtr.Zero, IntPtr.Zero, false, (UInt32) CreateProcessFlags.CREATE_NEW_CONSOLE, IntPtr.Zero, null,
IntPtr.Zero, IntPtr.Zero, false, (UInt32)CreateProcessFlags.CREATE_NO_WINDOW, IntPtr.Zero, null,
ref info, out procInfo);
Debug.WriteLine(string.Format("CreateProcessAsUser result: {0}", result));
}
if (p.ToInt32() != 0)
{
Marshal.Release(p);
Debug.WriteLine(string.Format("Released handle p: {0}", p));
}
if (duplicate.ToInt32() != 0)
{
Marshal.Release(duplicate);
Debug.WriteLine(string.Format("Released handle duplicate: {0}", duplicate));
}
//Wait for the process to complete
WaitForSingleObject(procInfo.hProcess, (int)INFINITE);
//Get and return the exit code
uint exitcode;
GetExitCodeProcess(procInfo.hProcess, out exitcode);
return exitcode;
}
public static int GetCurrentSessionId()
{
uint sessionId = WTSGetActiveConsoleSessionId();
Debug.WriteLine(string.Format("sessionId: {0}", sessionId));
if (sessionId == 0xFFFFFFFF)
return -1;
else
return (int)sessionId;
}
public static bool IsUserLoggedOn()
{
List<WTS_SESSION_INFO> wtsSessionInfos = ListSessions();
Debug.WriteLine(string.Format("Number of sessions: {0}", wtsSessionInfos.Count));
int activeSessionCount = 0;
foreach (var session in wtsSessionInfos)
{
if (session.State == ConnectionState.Active)
activeSessionCount++;
}
//return wtsSessionInfos.Where(x => x.State == ConnectionState.Active).Count() > 0;
return activeSessionCount > 0;
}
private static IntPtr GetCurrentUserToken()
{
List<WTS_SESSION_INFO> wtsSessionInfos = ListSessions();
int sessionId = 0;
foreach (var session in wtsSessionInfos)
{
if (session.State == ConnectionState.Active)
{
sessionId = session.SessionID;
break;
}
}
//Old Linq method
//int sessionId = wtsSessionInfos.Where(x => x.State == ConnectionState.Active).FirstOrDefault().SessionID;
//int sessionId = GetCurrentSessionId();
Debug.WriteLine(string.Format("sessionId: {0}", sessionId));
if (sessionId == int.MaxValue)
{
return IntPtr.Zero;
}
else
{
IntPtr p = new IntPtr();
int result = WTSQueryUserToken((UInt32)sessionId, out p);
Debug.WriteLine(string.Format("WTSQueryUserToken result: {0}", result));
Debug.WriteLine(string.Format("WTSQueryUserToken p: {0}", p));
return p;
}
}
public static List<WTS_SESSION_INFO> ListSessions()
{
IntPtr server = IntPtr.Zero;
List<WTS_SESSION_INFO> ret = new List<WTS_SESSION_INFO>();
try
{
IntPtr ppSessionInfo = IntPtr.Zero;
Int32 count = 0;
Int32 retval = WTSEnumerateSessions(IntPtr.Zero, 0, 1, ref ppSessionInfo, ref count);
Int32 dataSize = Marshal.SizeOf(typeof(WTS_SESSION_INFO));
Int64 current = (int)ppSessionInfo;
if (retval != 0)
{
for (int i = 0; i < count; i++)
{
WTS_SESSION_INFO si =
(WTS_SESSION_INFO)Marshal.PtrToStructure((System.IntPtr)current,
typeof(WTS_SESSION_INFO));
current += dataSize;
ret.Add(si);
}
WTSFreeMemory(ppSessionInfo);
}
}
catch (Exception exception)
{
Debug.WriteLine(exception.ToString());
}
return ret;
}
}
我们将文件名作为参数传递给截图应用程序，然后等待它完成。该服务随后会拾取文件并进行处理并将其删除。
我们还使用命名管道找到了另一种解决方法。我不太熟悉该解决方案。
关于c - 执行从 Windows 服务捕获屏幕截图的程序，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/38752939/