Problem with client

This is a discussion on Problem with client within the Networking/Device Communication forums, part of the General Programming Boards category; Hello, Ive programmed a chatprogram, but the client doesn't connect to the server. I'm in a local Network. But when ...

  1. #1
    Registered User
    Join Date
    Oct 2009
    Posts
    2

    Question Problem with client

    Hello,
    Ive programmed a chatprogram, but the client doesn't connect to the server.
    I'm in a local Network. But when someone from outside this network want to connect to
    my computer it doesn't work. Here are the sources from the server and the client:

    Client :
    Code:
    #include <windows.h>
    #include <stdio.h>
    #include <stdlib.h>
    #include <string.h>
    #include <winsock.h>
    #include "resource.h"
    
    LRESULT CALLBACK WndProc(HWND, UINT, WPARAM, LPARAM);
    
    int i;
    char ip[20];
    char version[] = {"Senden"};
    FILE *f;
    WSADATA wsa;
    int s;
    int senden;
    struct sockaddr_in addr;
    char text[75];
    char own_name[60];
    char name[60];
    	
    LPCSTR lpszAppName = version;
    LPCSTR lpszTitle   = version;
    
    HINSTANCE hInst;
    
    int APIENTRY WinMain(HINSTANCE hInstance,
               HINSTANCE hPrevInstance, PSTR szCmdLine, int iCmdShow)
    {
       HWND       hWnd, bButton, hList;
       MSG        msg;
       WNDCLASSEX   wc;
    
       wc.cbSize        =  sizeof(WNDCLASSEX);
       wc.style         =  CS_HREDRAW | CS_VREDRAW;
       wc.lpfnWndProc   =  WndProc;
       wc.cbClsExtra    =  0;
       wc.cbWndExtra    =  0;
       wc.hInstance     =  hInstance;
       wc.hCursor       =  LoadCursor(NULL,IDC_ARROW);
       wc.hIcon         =  LoadIcon(GetModuleHandle(NULL), MAKEINTRESOURCE(IDI_APPLICATION));
       wc.hbrBackground =  GetStockObject(DKGRAY_BRUSH);
       wc.lpszClassName =  lpszAppName;
       wc.lpszMenuName  =  NULL;
       wc.hIconSm       =  (HICON)LoadImage(GetModuleHandle(NULL), MAKEINTRESOURCE(IDI_APPLICATION), IMAGE_ICON, 16, 16, 0);
    
       if( RegisterClassEx(&wc) == 0)
          return 0;
          
    
          
       hInst=hInstance;
       
    hWnd = CreateWindowEx(NULL,
                             lpszAppName,
                             lpszTitle,
                             WS_OVERLAPPEDWINDOW,
                             200,
                             200,
                             400,
                             100,
                             NULL,
                             NULL,
                             hInstance,
                             NULL);
    
    bButton = CreateWindow("BUTTON","Senden",WS_CHILD|WS_VISIBLE|
                              BS_DEFPUSHBUTTON, 140, 40, 100, 20,
                              hWnd, (HMENU)BUTTON, hInstance, NULL);
    
       if( hWnd == NULL)
          return 0;
    
       ShowWindow(hWnd, iCmdShow);
       UpdateWindow(hWnd);
    
       while (GetMessage(&msg, NULL, 0, 0))
       {
          TranslateMessage(&msg);
          DispatchMessage(&msg);
       }
    
    
       return msg.wParam;
    }
    
          
    
    LRESULT CALLBACK WndProc(HWND hWnd, UINT umsg, WPARAM wParam, LPARAM lParam)
    {    
       HWND hEdit; 
       
       switch (umsg)
       {      
              case WM_CREATE:
                   {
                   
                   hEdit = CreateWindowEx(WS_EX_CLIENTEDGE, "EDIT", "", 
    				WS_CHILD | WS_VISIBLE , 
    				10, 10, 368, 20, hWnd, (HMENU)IDC_EDIT, GetModuleHandle(NULL), NULL);
    				SendMessage(hEdit, WM_SETFONT, (WPARAM)GetStockObject(DEFAULT_GUI_FONT), TRUE);
    				break;
                    }
                    
              case WM_DESTROY:
                   remove("send");
                   PostQuitMessage(0);
                   return 0;
              break;
              
          case WM_COMMAND :
                  switch( LOWORD( wParam ) )
                  { 
                          case BUTTON:
                          memset(ip, 0, sizeof(ip));
                          //Socket wird vorbereitet
                          f = fopen("own_name", "r");
                          while( fgets(name, sizeof(name), f) !=0 )
                          {}
                          fclose(f);
                          strcpy(own_name, "_");
                          strcat(own_name, name);
                          f = fopen("send", "r");
                          fgets(ip, sizeof(ip), f);
                          fclose(f);
                          
                          MessageBox(NULL,ip,"TEST",MB_OK);
                          
                          addr.sin_family = AF_INET;
                          addr.sin_port = htons(7700);
                          addr.sin_addr.s_addr = inet_addr( ip );
                          
                          MessageBox(NULL,ip,"TEST",MB_OK);
                          if (WSAStartup(MAKEWORD(1, 1), &wsa))
                          {
                          		MessageBox(NULL,"WSAStartup() failed!","ERROR",MB_OK | MB_ICONERROR);
                          }
    
                          s = socket(AF_INET,SOCK_STREAM,0);
    
                          if (connect(s, (struct sockaddr*) &addr, sizeof(addr)) < 0)
                          {
                          		     MessageBox(NULL, "Fehler beim Senden!", "ERROR",MB_OK | MB_ICONERROR);
                          }
                          GetDlgItemText( hWnd, IDC_EDIT, text, sizeof(text) -15);
                          strcat(text, own_name);
                          
    
    	                  senden = send(s, text, strlen(text), 0);
    	                  closesocket(s);
    	                  PostQuitMessage(0);
                          return 0;
                          break;             
                  }
          break;
          
       }
       return DefWindowProc(hWnd, umsg, wParam, lParam);
    }



    Server:
    Code:
    #include <stdio.h>
    #include <stdlib.h>
    #include <string.h>
    #include <windows.h>
    #include <mmsystem.h>
    #include <winsock.h>
    
    int main(int argc, char *argv[])
    {
    	WSADATA wsa;
    	char user_name[60];
    	int i = 0;
    	int j = 0;
    	int s;
    	int c;
    	int empfangen;
    	char text[75];
    	char message[75];
       	struct sockaddr_in cli;
    	int cli_size;
    	struct sockaddr_in addr;
    	FILE * f;
    
    
    	if (WSAStartup(MAKEWORD(1, 1), &wsa))
    	{
    		printf("WSAStartup() failed, %lu\n", (unsigned long)GetLastError());
    		return EXIT_FAILURE;
    	}
    
    	s = socket(AF_INET,SOCK_STREAM,0);
    
    	memset( &addr, 0, sizeof (addr));
    	addr.sin_family = AF_INET;
    	addr.sin_port = htons(7700);
    	addr.sin_addr.s_addr = htonl( INADDR_ANY );
    
    	if (bind(s, (struct sockaddr*) &addr, sizeof(addr)) == -1)
    	{
    		perror("bind() failed");
    	}
    
    	if (listen(s, 3) == -1)
    	{
    		perror("listen () failed");
    	}
    
    	for(;;)
    	{
    		cli_size = sizeof(cli);
    		c = accept(s, (struct sockaddr*) &cli, &cli_size);
    
    		printf("Verbindung von %s\n", inet_ntoa(cli.sin_addr));
    		empfangen = recv(c, text, sizeof(text) - 1, 0);
    		PlaySound("neue_nachricht.wav",NULL,SND_FILENAME);
    		if (empfangen > 0)
    		{
    			text[empfangen] = '\0';
    			strcpy(message, text);
    			i = sizeof(message);
    			
    			while ( message[i] != 95)
    			{
                      message[i] = 0;
                      i--;
                }
                message[i] = 0;
                i = 0;
                
                while( text[i] != 95)
                i++;
                
                i++;
                while ( text[i] != 0)
                {
                      user_name[j] = text[i];
                      j++;
                      i++;
                }
                
                strcat(user_name, " (");
                strcat(user_name, inet_ntoa(cli.sin_addr));
                strcat(user_name, ")");
                f = fopen("usr", "w");
                fputs(user_name, f);
                fclose(f);          
                
    			f = fopen("msg", "w");
    			fputs(message,f);
    			fclose(f);
    			i = 0;
    			while( user_name[i] != sizeof(user_name))
    			{
                       user_name[i] = 0;
                       i++;
                 }
                 i = 0;
                 j = 0;
    			
    		}
    		else
    		{
    			printf("Fehler beim lesen\n");
    		}
    		closesocket(c);
    	}
    
    	closesocket(s);
    
    	getchar();
    	return 0;
    }
    I hope someone can help me.


    PS: I am from Germany so my english is not perfect!

  2. #2
    a_capitalist_story
    Join Date
    Dec 2007
    Posts
    2,652
    Sounds like your firewall is not allowing the traffic through.

  3. #3
    Registered User
    Join Date
    Oct 2009
    Posts
    2

    Unhappy

    But that isn't the problem. I've turned the firewall off and tested it...but it doesn't work.

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