尝试在虚拟机中部署一个作为后台服务运行的控制台应用程序

Question

我正在尝试部署一个作为后台服务运行的控制台应用程序，该控制台应用程序会截取用户当前屏幕的屏幕截图并将其保存在 blob 容器中，当我手动单击 exe 文件时，代码可以在本地计算机和虚拟机上完美运行并运行它，但是当我通过创建服务来自动化相同的操作时，存储在 blob 中的所有 ss 都是空白的，有人可以帮助我知道发生了什么吗？

我正在尝试将 ss 保存在 blob 文件中，以便 c# 控制台应用程序应该在我的 azure vm 中作为后台服务工作，但是该服务正在运行，存储在 blob 中的 ss 是空白的，但是当我通过单击它手动运行 exe 文件时，它是很好

Answer 1

您很可能正在尝试捕获远程会话 (RDP) 的屏幕。当您在本地运行时，您正在处理默认（控制台）会话。

你有两个选择。你可以：

使用其中一种启动方法（例如 RunOmce 或 RunOnceEx）在用户登录时运行应用程序，或者，
修改你的代码。

如果修改代码，则需要枚举虚拟机上的登录会话，获取用户令牌，并在用户会话中创建一个进程。

假设您的代码是 C#.NET（不太难反应为 C# 或 C++）...

枚举会话

using System;
using System.Runtime.InteropServices;

public class SessionHelper
{
    [DllImport("wtsapi32.dll")]
    private static extern bool WTSEnumerateSessions(IntPtr hServer, int Reserved, int Version, ref IntPtr ppSessionInfo, ref int pCount);

    [DllImport("wtsapi32.dll")]
    private static extern void WTSFreeMemory(IntPtr pMemory);

    [DllImport("wtsapi32.dll")]
    private static extern bool WTSQueryUserToken(uint sessionId, out IntPtr phToken);

    public static uint GetActiveSessionId()
    {
        IntPtr ppSessionInfo = IntPtr.Zero;
        int count = 0;
        if (WTSEnumerateSessions(IntPtr.Zero, 0, 1, ref ppSessionInfo, ref count))
        {
            int dataSize = Marshal.SizeOf(typeof(WTS_SESSION_INFO));
            long current = (long)ppSessionInfo;
            for (int i = 0; i < count; i++)
            {
                WTS_SESSION_INFO si = (WTS_SESSION_INFO)Marshal.PtrToStructure((IntPtr)current, typeof(WTS_SESSION_INFO));
                current += dataSize;
                if (si.State == WTS_CONNECTSTATE_CLASS.WTSActive)
                {
                    WTSFreeMemory(ppSessionInfo);
                    return si.SessionId;
                }
            }
            WTSFreeMemory(ppSessionInfo);
        }
        throw new Exception("No active sessions found");
    }

    public static IntPtr GetUserToken(uint sessionId)
    {
        if (!WTSQueryUserToken(sessionId, out IntPtr token))
            throw new Exception("Could not get user token");
        return token;
    }

    [StructLayout(LayoutKind.Sequential)]
    private struct WTS_SESSION_INFO
    {
        public uint SessionId;
        [MarshalAs(UnmanagedType.LPStr)]
        public string pWinStationName;
        public WTS_CONNECTSTATE_CLASS State;
    }

    private enum WTS_CONNECTSTATE_CLASS
    {
        WTSActive
    }
}

在用户会话中创建进程

using System;
using System.Diagnostics;
using System.Runtime.InteropServices;
using System.Security.Principal;

public class ProcessHelper
{
    [DllImport("advapi32.dll", SetLastError = true, CharSet = CharSet.Auto)]
    private static extern bool CreateProcessAsUser(IntPtr hToken, string lpApplicationName, string lpCommandLine, IntPtr lpProcessAttributes, IntPtr lpThreadAttributes, bool bInheritHandles, uint dwCreationFlags, IntPtr lpEnvironment, string lpCurrentDirectory, ref STARTUPINFO lpStartupInfo, out PROCESS_INFORMATION lpProcessInformation);

    public static void StartCaptureProcess(IntPtr userToken)
    {
        STARTUPINFO si = new STARTUPINFO();
        PROCESS_INFORMATION pi = new PROCESS_INFORMATION();
        si.cb = Marshal.SizeOf(si);
        
        string captureApp = @"C:\Path\To\YourCaptureApp.exe"; // Path to your screen capture application

        if (!CreateProcessAsUser(userToken, captureApp, null, IntPtr.Zero, IntPtr.Zero, false, 0, IntPtr.Zero, null, ref si, out pi))
            throw new Exception("Could not start process in user session");

        CloseHandle(pi.hProcess);
        CloseHandle(pi.hThread);
    }

    [DllImport("kernel32.dll", SetLastError = true)]
    private static extern bool CloseHandle(IntPtr hObject);

    [StructLayout(LayoutKind.Sequential)]
    private struct STARTUPINFO
    {
        public int cb;
        public string lpReserved;
        public string lpDesktop;
        public string lpTitle;
        public int dwX;
        public int dwY;
        public int dwXSize;
        public int dwYSize;
        public int dwXCountChars;
        public int dwYCountChars;
        public int dwFillAttribute;
        public int dwFlags;
        public short wShowWindow;
        public short cbReserved2;
        public IntPtr lpReserved2;
        public IntPtr hStdInput;
        public IntPtr hStdOutput;
        public IntPtr hStdError;
    }

    [StructLayout(LayoutKind.Sequential)]
    private struct PROCESS_INFORMATION
    {
        public IntPtr hProcess;
        public IntPtr hThread;
        public uint dwProcessId;
        public uint dwThreadId;
    }
}

确保您遵守法律。用户应该意识到，出于隐私原因和数据保护，他们的会话被捕获。