Write list in binary file

Question

The idea of this method is to write all the words of a list of nodes in a binary file. I have a linked list of nodes, where each node has two information, its information, and a reference to the next node in the list. The idea is to write the information of each node in a binary file. However, I am getting the following error:

Warning: incompatible Pointer to integer Conversion assigning to 'char' from 'const char *'

Which occurs on this line of the code:

*pal = nodo->info;

I just don’t understand what the problem is, since my structure defines the information of the node as a pointer as well. Below is the NODO structure code and method

typedef struct Temp{
    char const *info;
    struct Temp *prox;
}TNODOPAL;

Method :

void escreveBinario(){

    TNODOPAL *nodo = inicioPal;

    FILE *fp;
    char *pal = NULL;

    fp = fopen( "binary.dat" , "wb" );

    if (fp == NULL) // Se não conseguiu criar
    {
        printf("Problemas na CRIACAO do arquivo\n");
        return;
    }

    while(nodo != NULL){
        *pal = nodo->info;
        fwrite (&pal, sizeof(char) * 30, 200, fp);
        nodo = nodo->prox;
    }
    fclose(fp);

}

Answer 1

pal is a pointer to char then *pal will be a memory position containing a char. When você faz*pal = cvocê está armazenando um char na posição de memória apontada pelo ponteiropal`.

I think what you wanted to do is

pal = nodo->info
fwrite (pal, sizeof(char) * 30, 200, fp);

Or simply

fwrite (nodo->info, sizeof(char) * 30, 200, fp);