我有以下代码将结构写入文件,如下所示:
void write_assignments_to_file(list* assignments, FILE* file)
{
while (assignments != NULL) {
fwrite(assignments->a, sizeof(assignments->a), 1, file);
assignments = assignments->next;
}
fclose(file);
}
这是写入文件,但是当我尝试再次读取文件时,它会挂起我的读取代码,如下所示:
list* read_assignments_from_file(FILE* file)
{
Assignment* assignment;
list* item;
item = NULL;
while ( fread(assignment, sizeof(assignment), 1, file) ) {
printf("Reading an assignment in");
insert(item, assignment);
}
fclose(file);
return item;
}
我的插入方法如下所示:
list* insert(list* assignment_pointer, Assignment* new_assignment)
{
list* ap = assignment_pointer;
if(assignment_pointer != NULL){
while (assignment_pointer->next != NULL) {
assignment_pointer = assignment_pointer -> next;
}
assignment_pointer -> next = (struct list*)malloc(sizeof(list));
assignment_pointer = assignment_pointer -> next;
assignment_pointer -> next = NULL;
assignment_pointer -> a = new_assignment;
return ap;
} else {
assignment_pointer = (list*) malloc (sizeof(list));
assignment_pointer -> next = NULL;
assignment_pointer -> a = new_assignment;
return assignment_pointer;
}
}
我的分配结构定义如下:
typedef struct Assignment {
char* moduleTitle;
char* moduleId;
char* title;
char* author;
time_t date_set;
time_t date_due;
int weighting;
} Assignment;
那么是什么导致我的程序挂起?