socket BUFFER TO STRING

Question

I have an issues to convert my BUFFER into a string, I like to know how do I convert my BUFFER, recv from the socket.

I would like to have like my db[0] = buffer, which buffer contain a string like "helloworld", so if i want print db[0], i would get "helloworld".

while(1){
    recv(newSocket, buffer, BUFFER_SIZE, 0);
    if(strcmp(buffer, "q") == 0){
        printf("Deconnexion de %s:%d\n", inet_ntoa(newAddr.sin_addr), ntohs(newAddr.sin_port));
        break;
    }else{
        printf("%s\n",buffer);//Client recu: 
        send(newSocket, buffer, strlen(buffer), 0);
        bzero(buffer, sizeof(buffer));

        db[i]=buffer;

        printf("%c",db[i]);

        //mysql_q(db[i]);// query function

        i++;
    }               
}

db type is a char array, but when i compile it gives me this error :

server.cpp:81:12: error: invalid conversion from ‘char*’ to ‘char’ [-fpermissive]
  db[i]=buffer;

What is the type of db and buffer, please show the definition ? error is quite clear db[i] is a char and buffer a char *. you should change db type — Ôrel
– Ôrel, Commented Jun 5, 2018 at 10:21
what kind of db? char[]? you should not assign char* to char, db[i] is a char. char* db[i] is better. — nameless1
– nameless1, Commented Jun 5, 2018 at 10:21
this is my db and buffer type : char buffer[BUFFER_SIZE]; char db[BUFFER_SIZE]; @Ôrel — Azures
– Azures, Commented Jun 5, 2018 at 10:24
@azures edit your question and insert complement inside. db[i] is a char and cannot receive a value of type char[]. — Jean-Baptiste Yunès
– Jean-Baptiste Yunès, Commented Jun 5, 2018 at 10:30

Maxim Egorushkin · Accepted Answer · 2018-06-05 11:21:08Z

3

You need to process return values of recv and send because they do incomplete reads and writes which must be handled.

Also, recv does not zero terminate received data, you need to do that yourself again to be able to call strcmp.

Most importantly, you need a way to delimit complete messages.

In other words, you need to rewrite the whole piece with message extraction, partial read/write and error handling to make it work.

edited Jun 5, 2018 at 11:21

answered Jun 5, 2018 at 10:29

Maxim Egorushkin

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Comments

Jay KM · Accepted Answer · 2018-06-05 10:34:28Z

0

if db[i] is a char array for which db should be double dimension array, you need to do a memcpy or strcpy (if you are sure that buffer will have null terminated string) to get contents of buffer to db[i].

db[i] = buffer

is wrong, thats why compilation error.

answered Jun 5, 2018 at 10:34

Jay KM

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