How Do I Parse Html Code In C, Thats Give An Excection

Question

1.00/5 (1 vote)

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C++

#include<conio.h>
#include <stdio.h>
#include <stdlib.h>
#include<winsock2.h>

#pragma comment(lib,"ws2_32.lib") //Winsock Library
 
int main(int argc , char *argv[])
{

char *ptr;	
char *token = NULL;
 char *aa = "<head>";

 //ptr=(char*)malloc(30000*sizeof(aa));


    WSADATA wsa;
    SOCKET s;
    struct sockaddr_in server;
     char *message , server_reply[30000];
    int recv_size;
 
    printf("\nInitialising Winsock...");
    if (WSAStartup(MAKEWORD(2,2),&wsa) != 0)
    {
        printf("Failed. Error Code : %d",WSAGetLastError());
        return 1;
    }
     
    printf("Initialised.\n");
     
    //Create a socket
    if((s = socket(AF_INET , SOCK_STREAM , 0 )) == INVALID_SOCKET)
    {
        printf("Could not create socket : %d" , WSAGetLastError());
    }
 
    printf("Socket created.\n");
     
     
    server.sin_addr.s_addr = inet_addr("ip address" );
    server.sin_family = AF_INET;
    server.sin_port = htons( 80 );
 
    //Connect to remote server
    if (connect(s , (struct sockaddr *)&server , sizeof(server)) < 0)
    {
        puts("connect error");
               getch();
        return 1;
    }
     
    puts("Connected");
     
    //Send some data
    message ="GET  / HTTP/1.1\r\nHost: www.....com\r\nConnection: close\r\n\r\n' | ncwww.......com 80 ";
       
       if( send(s , message , strlen(message) , 0) < 0)
    {
        puts("Send failed");
        return 1;
    }
    puts("Data Send\n");
     
    //Receive a reply from the server
 
   if((recv_size = recv(s , server_reply , 20835, 0)) == SOCKET_ERROR)
    {
        puts("recv failed");
    }
     
    puts("Reply received\n");
 
    //Add a NULL terminating character to make it a proper string before printing
    server_reply[recv_size] = '\0';
    //puts(server_reply);
   

  
    token = strtok(server_reply, "\n");

	while (token) {
   
    token = strtok(NULL, "\n");
	
	if(strstr(token,aa) !=NULL)
	{
      printf("%s",token);
    
	}
	
    }
     getch();
     return 0;
	}

Posted 5-Oct-15 20:20pm

Member 11835269

Updated 5-Oct-15 21:02pm

CPallini

v2

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Comments

Abhinav S 6-Oct-15 2:42am

Where is the exception? You could debug to figure out the exact location.

Member 11835269 6-Oct-15 3:15am

exception in if (strstr(token,aa)!=null);

2 solutions

Solution 1

For parsing HTML in C you best use some library. But there is a bunch of it but here is a comparison on wikipedia.

It mostly depends on your needs.

Posted 5-Oct-15 20:57pm

KarstenK

Comments

Member 11835269 6-Oct-15 3:12am

my that code i give u above also working but give me an exception on if(strstr()token,aa)!=NULL)

Albert Holguin 6-Oct-15 10:53am

when it comes to doing something trivial, common, but tedious.... use a library

Albert Holguin 6-Oct-15 10:54am

+5

Member 11835269 7-Oct-15 3:19am

every one use lib its not big deal before start any program every one add lib first
u moron

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Jochen Arndt · Accepted Answer · 2015-10-05T21:59:00

Your code fails because strtok returns finally NULL and you are passing this null pointer to strstr. So add an additional check or break your while loop in this case:

C++

while (token) {
    token = strtok(NULL, "\n");
    // Break when no more new line characters
    if (NULL == token)
        break;
    if(strstr(token,aa) !=NULL)
    {
      printf("%s",token);
    }
}