Pourquoi sscanf ne lit rien

Question

alors j'essaye de lire les chaînes en utilisant sscanf mais il ne semble pas lire quoi que ce soit. J'ai suivi le tutrial et ça a l'air très similaire. Je ne peux pas comprendre pourquoi il ne lit rien.

int main(){ 

    int status =0; 
    int ret = 0; 
    int arg; 
    char *cmdLine = NULL; 
    char *cmd=NULL; 
    size_t n = 0; 
    char *line = NULL; 
    char *token =NULL; 

    while (getline(&line, &n, stdin) > 0){ 
     //toekenize line 
     token = strtok(line,";"); 

     //go thorugh and scan for cmds 
     while(token !=NULL){ 
      // printf("token=%s\n", token); 
      cmdLine = token; 

      printf("%s\n", cmdLine); 
      //read the commands 
      ret=sscanf(cmdLine, "%31s %d", cmd, &arg); 

      printf("%d\n", ret); 

      token = strtok(NULL, ";"); 
     }//while loop 2 
     //set line and n back to null and 0. 
     line = NULL; 
     n = 0; 
    }//while loop 1 

Answer 1

Essayez ceci:

#include <stdio.h> 
#include <stdlib.h> 
#include <string.h> 

int main(void) 
{ 
    int status =0; 
    int ret = 0; 
    int arg; 
    char *cmdLine = NULL; 
    char cmd[100]; 
    size_t n = 0; 
    char *line = NULL; 
    char *token =NULL; 

    if (getline(&line, &n, stdin) > 0) 
    { 
     //toekenize line 
     token = strtok(line,";"); 

     //go thorugh and scan for cmds 
     if(token != NULL) 
     { 
      // printf("token=%s\n", token); 
      cmdLine = token; 

      printf(">>>> %s \n", cmdLine); 
      //read the commands 
      ret = sscanf(cmdLine, "%s %d", cmd, &arg); 
      printf(">>>> %d \n", ret); 

      token = strtok(NULL, ";"); 

     }//while loop 2 

     //set line and n back to null and 0. 
     line = NULL; 
     n = 0; 
    }//while loop 1 

    printf("Result string: %s and Arg: %d \n", cmd, arg); 
}