Dev C会编译此代码，但在文件创建过程中会显示err 3221225477

Question

I was trying to do some homework to keep up during holidays and i got stuck in this error

I've tried to compile both with GDB and Dev-C++ but neither of those could do that for different reasons

void creazioneFile(char s[12]){

    FILE *fp;
    char cod[10],tit[20],autore[20],editor[20],nomeFile[20];
    int annoPub,risp;
    sprintf(nomeFile, "%s.txt",s);
    fopen(nomeFile,"w");
    if(fp==NULL){
        printf("Si e\' verificato un errore");
        return;
    }
    do{
        printf("\nInserire codice libro: ");
        scanf("%s",cod);
        printf("\nInserire titolo del libro: ");
        scanf("%s",tit);
        printf("\nInserire autore del libro: ");
        scanf("%s",autore);
        printf("\nInserire anno di pubblicazione del libro: ");
        scanf("%d",&annoPub);
        printf("\nInserire editore libro: ");
        scanf("%s",editor);
        fprintf(fp,"%s %s %s %d %s\n",cod,tit,autore,annoPub,editor);
        printf("Si vuole inserire un altro record (1=si/0=no):");
        scanf("%d",&risp);
    }while(risp!=0);
    fclose(fp);
}

The output should give an option to repeat the cycle as much as needed, but it shows this error and the program forces me to quit

Answer 1

You open the file but do not save the file pointer. So you end up writing into an uninitialized file descriptor. Nice way to generate unique crashes! It should be:

fp = fopen(nomeFile,"w");

PS: These sorts of issues are easily caught if you pay attention to compiler warnings!

Answer 2

I think what you're trying to do is opening the file specified by your variable nomeFile and then write some strings to said file. The call to fopen returns a file handle - you need to save it in fp !

The code still compiles, because the statement itself is valid - it's return value is just never stored.