어부지망생 Posts - Answer Overflow

어부지망생

•Created by 어부지망생 on 7/10/2023 in #help

❔ Capture screen(video codec) and send to client simultaneously using socket

I have already made send image code (capture image and send to client continuously. But it causes lag. So i want to try new method. Code:

private void Screen()
        {
            try
            {
                listener_3.Start();
                eventLog1.WriteEntry("Waiting for connection...");

                while (true)
                {
                    Socket client = listener_3.AcceptSocket();
                    Console.WriteLine("Client connected");

                    while (client.Connected)
                    {
                        // Capture the screen
                        Bitmap screen = CaptureScreen();

                        int newWidth = screen.Width / 4; // Reduce width by half
                        int newHeight = screen.Height / 4; // Reduce height by half

                        Bitmap resizedImage = new Bitmap(newWidth, newHeight);

                        // Use Graphics.DrawImage to resize the image
                        using (Graphics graphics = Graphics.FromImage(resizedImage))
                        {
                            graphics.DrawImage(screen, 0, 0, newWidth, newHeight);
                        }

                        // Convert the resized image to a byte array and send it to the client
                        byte[] imageData = ImageToByteArray(resizedImage);
                        client.Send(imageData);

                        // Delay between sending each frame (adjust as needed)
                        Thread.Sleep(20);
                    }

                    eventLog1.WriteEntry("Connection terminated");
                    client.Close();
                }
            }
            catch (Exception e)
            {
                listener_3.Stop();
                listener_3 = new TcpListener(IPAddress.Any, 50523);
                eventLog1.WriteEntry("Error: " + e.Message);
            }
        }

private void Screen()
        {
            try
            {
                listener_3.Start();
                eventLog1.WriteEntry("Waiting for connection...");

                while (true)
                {
                    Socket client = listener_3.AcceptSocket();
                    Console.WriteLine("Client connected");

                    while (client.Connected)
                    {
                        // Capture the screen
                        Bitmap screen = CaptureScreen();

                        int newWidth = screen.Width / 4; // Reduce width by half
                        int newHeight = screen.Height / 4; // Reduce height by half

                        Bitmap resizedImage = new Bitmap(newWidth, newHeight);

                        // Use Graphics.DrawImage to resize the image
                        using (Graphics graphics = Graphics.FromImage(resizedImage))
                        {
                            graphics.DrawImage(screen, 0, 0, newWidth, newHeight);
                        }

                        // Convert the resized image to a byte array and send it to the client
                        byte[] imageData = ImageToByteArray(resizedImage);
                        client.Send(imageData);

                        // Delay between sending each frame (adjust as needed)
                        Thread.Sleep(20);
                    }

                    eventLog1.WriteEntry("Connection terminated");
                    client.Close();
                }
            }
            catch (Exception e)
            {
                listener_3.Stop();
                listener_3 = new TcpListener(IPAddress.Any, 50523);
                eventLog1.WriteEntry("Error: " + e.Message);
            }
        }

7 replies

CC#

•Created by 어부지망생 on 4/19/2023 in #help

❔ why this code works temporary?

This code works fine for a while in a windows service, but after some time it doesn't work. So, i stopped the Windows service and run it again, the Notify icon looks fine, but the icon does not appear in the icon tray after rebooting. And i copied this code in website so i didn't understand this code. So whoever knows they way this code is working , please tell me specifically.

2 replies

CC#

•Created by 어부지망생 on 4/15/2023 in #help

❔ execute winform application by using windows service

i have already made winform application and it works properly but i want to make winform program executed by windows service is it possible ? and if it is impossible then please tell me the reason why.

21 replies

CC#

•Created by 어부지망생 on 3/31/2023 in #help

❔ windows service returns error code 5

public const int KEYEVENTF_EXTENTEDKEY = 1;
        public const int KEYEVENTF_KEYUP = 0;
        public const int VK_MEDIA_NEXT_TRACK = 0xB0;
        public const int VK_MEDIA_PLAY_PAUSE = 0xB3;
        public const int VK_MEDIA_PREV_TRACK = 0xB1;

        [DllImport("user32.dll")]
        static extern uint SendInput(uint nInputs, [MarshalAs(UnmanagedType.LPArray), In] INPUT[] pInputs, int cbSize);

        [StructLayout(LayoutKind.Sequential)]
        struct INPUT
        {
            public uint type;
            public InputUnion U;
        }

        [StructLayout(LayoutKind.Explicit)]
        struct InputUnion
        {
            [FieldOffset(0)]
            public MOUSEINPUT mi;

            [FieldOffset(0)]
            public KEYBDINPUT ki;

            [FieldOffset(0)]
            public HARDWAREINPUT hi;
        }

        [StructLayout(LayoutKind.Sequential)]
        struct KEYBDINPUT
        {
            public ushort wVk;
            public ushort wScan;
            public uint dwFlags;
            public uint time;
            public IntPtr dwExtraInfo;
        }

        static void SendMediaKey(ushort wScanCode)
        {
            INPUT input = new INPUT();
            input.type = 1;
            input.U.ki.wScan = wScanCode;
            input.U.ki.dwFlags = 0x0008; // KEYEVENTF_SCANCODE
            SendInput(1, new INPUT[] { input }, Marshal.SizeOf(typeof(INPUT)));
        }

public static void Example()
{
  SendMediaKey(VK_MEDIA_NEXT_TRACK);
}

public const int KEYEVENTF_EXTENTEDKEY = 1;
        public const int KEYEVENTF_KEYUP = 0;
        public const int VK_MEDIA_NEXT_TRACK = 0xB0;
        public const int VK_MEDIA_PLAY_PAUSE = 0xB3;
        public const int VK_MEDIA_PREV_TRACK = 0xB1;

        [DllImport("user32.dll")]
        static extern uint SendInput(uint nInputs, [MarshalAs(UnmanagedType.LPArray), In] INPUT[] pInputs, int cbSize);

        [StructLayout(LayoutKind.Sequential)]
        struct INPUT
        {
            public uint type;
            public InputUnion U;
        }

        [StructLayout(LayoutKind.Explicit)]
        struct InputUnion
        {
            [FieldOffset(0)]
            public MOUSEINPUT mi;

            [FieldOffset(0)]
            public KEYBDINPUT ki;

            [FieldOffset(0)]
            public HARDWAREINPUT hi;
        }

        [StructLayout(LayoutKind.Sequential)]
        struct KEYBDINPUT
        {
            public ushort wVk;
            public ushort wScan;
            public uint dwFlags;
            public uint time;
            public IntPtr dwExtraInfo;
        }

        static void SendMediaKey(ushort wScanCode)
        {
            INPUT input = new INPUT();
            input.type = 1;
            input.U.ki.wScan = wScanCode;
            input.U.ki.dwFlags = 0x0008; // KEYEVENTF_SCANCODE
            SendInput(1, new INPUT[] { input }, Marshal.SizeOf(typeof(INPUT)));
        }

public static void Example()
{
  SendMediaKey(VK_MEDIA_NEXT_TRACK);
}

2 replies

CC#

•Created by 어부지망생 on 3/25/2023 in #help

❔ keyboard input not working in windows service

keyboard input error

6 replies

CC#

•Created by 어부지망생 on 3/1/2023 in #help

❔ Allow service to interact with desktop

public const int KEYEVENTF_EXTENTEDKEY = 1;
        public const int KEYEVENTF_KEYUP = 0;
        public const int VK_MEDIA_NEXT_TRACK = 0xB0;
        public const int VK_MEDIA_PLAY_PAUSE = 0xB3;
        public const int VK_MEDIA_PREV_TRACK = 0xB1;

        [DllImport("user32.dll")]
        public static extern void keybd_event(byte virtualKey, byte scanCode, uint flags, IntPtr extraInfo);
keybd_event(VK_MEDIA_PREV_TRACK, 0, KEYEVENTF_EXTENTEDKEY, IntPtr.Zero);    // PREV

public const int KEYEVENTF_EXTENTEDKEY = 1;
        public const int KEYEVENTF_KEYUP = 0;
        public const int VK_MEDIA_NEXT_TRACK = 0xB0;
        public const int VK_MEDIA_PLAY_PAUSE = 0xB3;
        public const int VK_MEDIA_PREV_TRACK = 0xB1;

        [DllImport("user32.dll")]
        public static extern void keybd_event(byte virtualKey, byte scanCode, uint flags, IntPtr extraInfo);
keybd_event(VK_MEDIA_PREV_TRACK, 0, KEYEVENTF_EXTENTEDKEY, IntPtr.Zero);    // PREV

this code works properly in windows form but it doesn't in windows service so i found i need to allow service to interact with desktop so i tried but it doesn't work neither

87 replies

CC#

•Created by 어부지망생 on 2/26/2023 in #help

❔ media key press

37 replies

CC#

•Created by 어부지망생 on 2/20/2023 in #help

❔ windows service socket error

socket accept works successfully in IDE, but not in win service.

10 replies

CC#

•Created by 어부지망생 on 2/14/2023 in #help

❔ Win service error..

public static String GetPcName()
        {
            string hostName = System.Net.Dns.GetHostName();

            return hostName;

        }

        public static String GetMacAddr()
        {
            string MacAddr = (from nic in NetworkInterface.GetAllNetworkInterfaces() where nic.OperationalStatus == OperationalStatus.Up select nic.GetPhysicalAddress().ToString()).FirstOrDefault();

            return MacAddr;
        }
public static String GetPcName()
        {
            string hostName = System.Net.Dns.GetHostName();

            return hostName;

        }

        public static String GetMacAddr()
        {
            string MacAddr = (from nic in NetworkInterface.GetAllNetworkInterfaces() where nic.OperationalStatus == OperationalStatus.Up select nic.GetPhysicalAddress().ToString()).FirstOrDefault();

            return MacAddr;
        }

public static String GetPcName()
        {
            string hostName = System.Net.Dns.GetHostName();

            return hostName;

        }

        public static String GetMacAddr()
        {
            string MacAddr = (from nic in NetworkInterface.GetAllNetworkInterfaces() where nic.OperationalStatus == OperationalStatus.Up select nic.GetPhysicalAddress().ToString()).FirstOrDefault();

            return MacAddr;
        }
public static String GetPcName()
        {
            string hostName = System.Net.Dns.GetHostName();

            return hostName;

        }

        public static String GetMacAddr()
        {
            string MacAddr = (from nic in NetworkInterface.GetAllNetworkInterfaces() where nic.OperationalStatus == OperationalStatus.Up select nic.GetPhysicalAddress().ToString()).FirstOrDefault();

            return MacAddr;
        }

i wonder why win32 service does not work well.. this code works well in not service i don't know what's the problem

67 replies

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