Select(); server help!

This is a discussion on Select(); server help! within the Networking/Device Communication forums, part of the General Programming Boards category; Ok, so I've done a select server before, but i've lost my code and I need the same flexability for ...

  1. #1
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    Select(); server help!

    Ok, so I've done a select server before, but i've lost my code and I need the same flexability for a new app i'm making. There are a couple problems. When I run the program, the sockets seam to bind fine and the code tells me it is listening, however it doesnt show up in netstat on xp or vista... But I have a couple client/server dos proggies that work that don't show up either. Anyone know why? I am no good at debugging so things like this always help if they work.

    Second, (this didnt used to happen) but after i run the app, i click "ID_START_SERVER" and it goes into this:

    Code:
    case ID_START_SERVER:
    			if(ServRunning==TRUE)
    			{
    				SendDlgItemMessage(hwnd,IDC_LIST1, LB_ADDSTRING,0,(LPARAM)"The Server is already Started.");
    				break;
    			}
    			ServRunning=TRUE;
    			SendDlgItemMessage(hwnd,IDC_LIST1, LB_ADDSTRING,0,(LPARAM)"Searching for Connections...");
    			MSG   msg;             // Message structure.
    			SOCKET AcceptSocket;
    			AcceptSocket=SOCKET_ERROR;
    			while(ServRunning==TRUE)
    			{
    
    				if (PeekMessage(&msg, hwnd, 0, 0, PM_REMOVE))
    				{
    					DispatchMessage(&msg);
    					TranslateMessage(&msg);
    				}
    				else
    				{
    					///////////////////////////////
    					//do busy work here
    					////////////////////////////////
    
    
    					// request occurs, call the accept function to handle the request.
    
    
    					AcceptSocket = accept(m_socket, NULL, NULL);
    
    					if(AcceptSocket ==SOCKET_ERROR)
    					{
    
    						SendDlgItemMessage(hwnd,IDC_LIST1, LB_ADDSTRING,0,(LPARAM)".");					
    						
    					}
    					else
    					{
    						m_socket = AcceptSocket;  
    						SendDlgItemMessage(hwnd,IDC_LIST1, LB_ADDSTRING,0,(LPARAM)"Client Connected!");
    					}
    
    
    
    
    
    
    
    				} //else
    			} //while(servrunning==true);
    			break; //id_start_server
    basically i have the peakmessage /translatemsg so I can get the window to respond so i can stop it. With the code I have in there for accepting a new connection, it won't respond. I had some other code in there that worked better, but it still wouldn't accept a connection.

    Third, the code doesn't work anyway. Won't accept a connection from a client(from what little I have tested) and i'm assuming it has to do with how i'm handling the winsock programming. I can post the rest of the code if necessary. There isn't too much more.

  2. #2
    Captain Crash brewbuck's Avatar
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    Quote Originally Posted by klipseracer View Post
    Code:
    					AcceptSocket = accept(m_socket, NULL, NULL);
    
    					if(AcceptSocket ==SOCKET_ERROR)
    					{
    
    						SendDlgItemMessage(hwnd,IDC_LIST1, LB_ADDSTRING,0,(LPARAM)".");					
    						
    					}
    					else
    					{
    						m_socket = AcceptSocket;  
    						SendDlgItemMessage(hwnd,IDC_LIST1, LB_ADDSTRING,0,(LPARAM)"Client Connected!");
    					}
    You are listening on m_socket, but you overwrite it when a client connects. That can't be right.

    Also, I see no call to bind() or listen() anywhere. You said you call them, but let's see the code that does it.

  3. #3
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    I use VC++ 2005 and i have a form for the GUI, its dialog based with a LIST that I output to.
    The code i'm showing here actually isn't the same code with the select() but I can post it if you want. I just am trying to get my GUI working with the winsock code first, and the select() part I can figure out.

    Code:
    #include <windows.h>
    #include "resource.h"
    
    
    
    //Globals
    BOOL ServRunning = FALSE;
    WSADATA wsaData;
    int wsaerr;
    int port=4005;
    
    
    
    //Create a SOCKET object called m_socket.
    SOCKET m_socket;
    
    
    //protos
    int StartSock(HWND hwnd);
    
    
    
    //Macros
    // Using MAKEWORD macro, Winsock version request 2.2
    WORD wVersionRequested = MAKEWORD(2, 2);
    
    
    
    
    BOOL CALLBACK DlgProc(HWND hwnd, UINT Message, WPARAM wParam, LPARAM lParam)
    {
    	switch(Message)
    	{
    	case WM_INITDIALOG:
    		// This is where we set up the dialog box, and initialise any default values
    		SendDlgItemMessage(hwnd,IDC_LIST1, LB_ADDSTRING,0,(LPARAM)"Server Initializing...");
    		StartSock(hwnd);
    		
    		break;
    	case WM_COMMAND:
    		switch(LOWORD(wParam))
    		{
    		case ID_FILE_EXIT:
    			closesocket(m_socket);
    			WSACleanup();
    			ServRunning=FALSE;
    			EndDialog(hwnd,0);
    			break;
    
    		case ID_STOP_SERVER:
    			if(ServRunning==FALSE)
    			{
    				SendDlgItemMessage(hwnd,IDC_LIST1, LB_ADDSTRING,0,(LPARAM)"The Server is already stopped.");
    				break;
    			}
    			ServRunning=FALSE;
    			SendDlgItemMessage(hwnd,IDC_LIST1, LB_ADDSTRING,0,(LPARAM)"Server Halted.");
    			break;
    
    		case ID_START_SERVER:
    			if(ServRunning==TRUE)
    			{
    				SendDlgItemMessage(hwnd,IDC_LIST1, LB_ADDSTRING,0,(LPARAM)"The Server is already Started.");
    				break;
    			}
    			ServRunning=TRUE;
    			SendDlgItemMessage(hwnd,IDC_LIST1, LB_ADDSTRING,0,(LPARAM)"Searching for Connections...");
    			MSG   msg;             // Message structure.
    			SOCKET AcceptSocket;
    			AcceptSocket=SOCKET_ERROR;
    			while(ServRunning==TRUE)
    			{
    
    				if (PeekMessage(&msg, hwnd, 0, 0, PM_REMOVE))
    				{
    					DispatchMessage(&msg);
    					TranslateMessage(&msg);
    				}
    				else
    				{
    					///////////////////////////////
    					//do busy work here
    					////////////////////////////////
    
    					// Create a temporary SOCKET object called AcceptSocket for accepting connections.
    
    
    
    
    
    					// Create a continuous loop that checks for connections requests. If a connection
    
    					// request occurs, call the accept function to handle the request.
    
    
    					AcceptSocket = accept(m_socket, NULL, NULL);
    
    					if(AcceptSocket ==SOCKET_ERROR)
    					{
    
    						SendDlgItemMessage(hwnd,IDC_LIST1, LB_ADDSTRING,0,(LPARAM)".");					
    						
    					}
    					else
    					{
    						m_socket = AcceptSocket;  
    						SendDlgItemMessage(hwnd,IDC_LIST1, LB_ADDSTRING,0,(LPARAM)"Client Connected!");
    						ServRunning=FALSE; //I added this to stop the looping. Basically, I just want to get one client to connect first.
    					}
    
    
    
    
    
    
    
    				} //else
    			} //while(servrunning==true);
    			break; //id_start_server
    
    		} //switch(LOWORD)
    		break; //wm_command
    
    
    	case WM_CLOSE:
    		closesocket(m_socket);
    		WSACleanup();
    		ServRunning=FALSE;
    		EndDialog(hwnd, 0);
    		break;
    
    	default:
    		return FALSE;
    	}
    	return TRUE;
    }
    
    
    int WINAPI WinMain(HINSTANCE hInstance, HINSTANCE hPrevInstance,
    				   LPSTR lpCmdLine, int nCmdShow)
    {
    	return DialogBox(hInstance, MAKEINTRESOURCE(IDD_MAIN), NULL, DlgProc);
    }
    
    
    
    
    
    
    /////////////////////
    //Functions
    ///////
    
    
    int StartSock(HWND hwnd)
    {
    
    
    	/////////////////////////////////////
    	// Windows Socket startup
    	/////////////////////////////////
    
    	wsaerr = WSAStartup(wVersionRequested, &wsaData);
    
    	if (wsaerr != 0)
    
    	{
    
    		SendDlgItemMessage(hwnd,IDC_LIST1, LB_ADDSTRING,0,(LPARAM)"Winsock .dll Not found!");
    		EndDialog(hwnd,0);
    	}
    
    
    	////////////
    	//Create a Socket
    	////////
    
    	// Call the socket function and return its value to the m_socket variable.
    
    	// For this application, use the Internet address family, streaming sockets, and
    
    	// the TCP/IP protocol.
    
    	// using AF_INET family, TCP socket type and protocol of the AF_INET - IPv4
    
    	m_socket = socket(AF_INET, SOCK_STREAM, IPPROTO_TCP);
    
    
    	/*use setsockopt(sock, SOL_SOCKET, SO_REUSEADDR, &reuse_addr,
    	sizeof(reuse_addr))*///in the future to reuse socket from time_wait issue
    
    	//setnonblocking(m_socket);
    
    
    	// Check for errors to ensure that the socket is a valid socket.
    
    	if (m_socket == INVALID_SOCKET)
    
    	{
    
    		SendDlgItemMessage(hwnd,IDC_LIST1, LB_ADDSTRING,0,(LPARAM)"Error at socket:");
    		WSACleanup();
    	}
    
    	else
    
    	{
    
    		SendDlgItemMessage(hwnd,IDC_LIST1, LB_ADDSTRING,0,(LPARAM)"Socket Created!");
    
    	}
    
    
    
    	////////////////bind//////////////////////////////
    
    	// Create a sockaddr_in object and set its values.
    
    	sockaddr_in service;
    	service.sin_family = AF_INET;
    	service.sin_addr.s_addr = inet_addr("127.0.0.1");
    	service.sin_port = port;
    
    
    
    	// Call the bind function, passing the created socket and the sockaddr_in structure as parameters.
    
    	// Check for general errors. 
    
    	if (bind(m_socket, (SOCKADDR*)&service, sizeof(service)) == SOCKET_ERROR)
    
    	{
    
    		SendDlgItemMessage(hwnd,IDC_LIST1, LB_ADDSTRING,0,(LPARAM)"Bind Failed!");
    
    		closesocket(m_socket);
    
    	}
    
    	else
    
    	{
    
    		SendDlgItemMessage(hwnd,IDC_LIST1, LB_ADDSTRING,0,(LPARAM)"Socket Bound OK!");
    
    	}
    
    
    	// Call the listen function, passing the created socket and the maximum number of allowed
    
    	// connections to accept as parameters. Check for general errors.
    
    	if (listen(m_socket, 1) == SOCKET_ERROR)
    
    		SendDlgItemMessage(hwnd,IDC_LIST1, LB_ADDSTRING,0,(LPARAM)"Error listending!");
    
    	else
    
    	{
    
    		SendDlgItemMessage(hwnd,IDC_LIST1, LB_ADDSTRING,0,(LPARAM)"Server is now listening for incomming connections!");
    
    	}
    
    	SendDlgItemMessage(hwnd,IDC_LIST1, LB_ADDSTRING,0,(LPARAM)"Done....start the Server!");
    
    
    	return 0;
    }

    Here is resource.h:

    Code:
    //{{NO_DEPENDENCIES}}
    // Microsoft Visual C++ generated include file.
    // Used by SunServ.rc
    //
    #define IDD_MAIN                        101
    #define IDR_MENU1                       102
    #define IDC_LIST1                       1001
    #define ID_FILE_EXIT                    40001
    #define ID_SERVER_STARTSERVER           40002
    #define ID_START_SERVER                 40003
    #define ID_SERVER_STOPSERVER            40004
    #define ID_STOP_SERVER                  40005
    
    // Next default values for new objects
    // 
    #ifdef APSTUDIO_INVOKED
    #ifndef APSTUDIO_READONLY_SYMBOLS
    #define _APS_NEXT_RESOURCE_VALUE        103
    #define _APS_NEXT_COMMAND_VALUE         40006
    #define _APS_NEXT_CONTROL_VALUE         1002
    #define _APS_NEXT_SYMED_VALUE           101
    #endif
    #endif


    Here is the SunServ.rc file:


    Code:
    // Microsoft Visual C++ generated resource script.
    //
    #include "resource.h"
    
    #define APSTUDIO_READONLY_SYMBOLS
    /////////////////////////////////////////////////////////////////////////////
    //
    // Generated from the TEXTINCLUDE 2 resource.
    //
    #include "afxres.h"
    
    /////////////////////////////////////////////////////////////////////////////
    #undef APSTUDIO_READONLY_SYMBOLS
    
    /////////////////////////////////////////////////////////////////////////////
    // English (U.S.) resources
    
    #if !defined(AFX_RESOURCE_DLL) || defined(AFX_TARG_ENU)
    #ifdef _WIN32
    LANGUAGE LANG_ENGLISH, SUBLANG_ENGLISH_US
    #pragma code_page(1252)
    #endif //_WIN32
    
    #ifdef APSTUDIO_INVOKED
    /////////////////////////////////////////////////////////////////////////////
    //
    // TEXTINCLUDE
    //
    
    1 TEXTINCLUDE 
    BEGIN
        "resource.h\0"
    END
    
    2 TEXTINCLUDE 
    BEGIN
        "#include ""afxres.h""\r\n"
        "\0"
    END
    
    3 TEXTINCLUDE 
    BEGIN
        "\r\n"
        "\0"
    END
    
    #endif    // APSTUDIO_INVOKED
    
    
    /////////////////////////////////////////////////////////////////////////////
    //
    // Dialog
    //
    
    IDD_MAIN DIALOGEX 0, 0, 186, 94
    STYLE DS_SETFONT | DS_MODALFRAME | DS_FIXEDSYS | WS_POPUP | WS_CAPTION | WS_SYSMENU
    CAPTION "SunServ"
    MENU IDR_MENU1
    FONT 8, "MS Shell Dlg", 400, 0, 0x1
    BEGIN
        LISTBOX         IDC_LIST1,7,7,172,80,LBS_NOINTEGRALHEIGHT | WS_VSCROLL | WS_TABSTOP
    END
    
    
    /////////////////////////////////////////////////////////////////////////////
    //
    // DESIGNINFO
    //
    
    #ifdef APSTUDIO_INVOKED
    GUIDELINES DESIGNINFO 
    BEGIN
        IDD_MAIN, DIALOG
        BEGIN
            LEFTMARGIN, 7
            RIGHTMARGIN, 179
            TOPMARGIN, 7
            BOTTOMMARGIN, 87
        END
    END
    #endif    // APSTUDIO_INVOKED
    
    
    /////////////////////////////////////////////////////////////////////////////
    //
    // Menu
    //
    
    IDR_MENU1 MENU 
    BEGIN
        POPUP "File"
        BEGIN
            MENUITEM "Exit",                        ID_FILE_EXIT
        END
        POPUP "Server"
        BEGIN
            MENUITEM "Start Server",                ID_START_SERVER
            MENUITEM "Stop Server",                 ID_STOP_SERVER
        END
    END
    
    #endif    // English (U.S.) resources
    /////////////////////////////////////////////////////////////////////////////
    
    
    
    #ifndef APSTUDIO_INVOKED
    /////////////////////////////////////////////////////////////////////////////
    //
    // Generated from the TEXTINCLUDE 3 resource.
    //
    
    
    /////////////////////////////////////////////////////////////////////////////
    #endif    // not APSTUDIO_INVOKED

    If there is a better way to code all this while keeping the simple dialog app, let me know. I would use a real window, but I couldn't figure out how to get a log window working right that displays 'debug' info.


    Here is where I got the select() code from:

    http://www.tenouk.com/Winsock/Winsock2example3.html
    Last edited by klipseracer; 03-02-2008 at 11:30 PM. Reason: Added code.

  4. #4
    Registered User
    Join Date
    Jan 2008
    Posts
    20
    I've found that if I comment out

    Code:
    AcceptSocket = accept(m_socket, NULL, NULL);
    the program doesn't hang, and it works like normal, but of course the connections aren't made.


    EDIT:

    Furthur research explains the non-blocking code I've been leaving out.

    I added this:
    Code:
    			ULONG NonBlock=1;
    			ioctlsocket(m_socket, FIONBIO, &NonBlock);
    And it seams to loop nicely. Now, just to get it to actually function...


    EDIT2: With this new code my client is able to connect. Now, I just need to straighten out the Select() portion of this.
    Last edited by klipseracer; 03-03-2008 at 12:26 AM.

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