find() function not working

[cscho0415]

So I'm having trouble understanding why the find() function isn't working. I am getting the error "Member reference base type 'char *' is not a structure or union" on the find function. I am also getting the error "Use of undeclared identifier 'npos'". Thank you for your help in advanced. Here is my code:

                    recv(sockfd, &buf, 256, 0);
                    cout << buf << endl;
                    char ping[] = "PING ";
                    if (buf.find(ping) != npos)
{
//whatever happens
}

[shacktar]

You need to use find() on a std::string, not on a char*. Also, you should only pass in buf, to the recv function.

#include <string>
#include <iostream>
using namespace std;

{
     char buf[256];
     recv( sockfd, buf, 256, 0 );

     string bufAsString( buf );

     cout << bufAsString << endl;

     char ping[] = "PING ";

     if ( bufAsString.find(ping) != npos )
     {
          //whatever happens
     }
}

[cscho0415]

Thank you so much that was very helpful.

#include <string>
#include <iostream>
using namespace std;

{
     static const size_t npos = -1; //Added cause npos was not declared
     char buf[256];
     recv( sockfd, buf, 256, 0 );
     string bufAsString( buf );
     cout << bufAsString << endl;
     char ping[] = "PING ";
     if ( bufAsString.find(ping) != npos )
     {
          //whatever happens
     }
}

[shacktar]

If npos is still not declared, try string::npos