<分区>
我正在创建的这个 C 程序在运行时得到一个 STATUS_ACCESS_VIOLATION，我相信这是由于一次初始化所有结构，然后使用 malloc() 增加它们的大小，导致指向引用内存的指针已经在使用。这是发生此异常的函数:
void process_track(char filename[], struct track *tracks) {
int i = 0;
FILE* fp;
int lines;
lines = count_file_lines(filename);
tracks = malloc(lines);
fp = fopen(filename, "r");
if (fp == NULL) {
printf("\n\"%s\" File not found", filename);
exit(1);
} else {
for (i = 0; i < lines; i++) {
fscanf(fp, "%d %d %d %d\n", &tracks[i].number, &tracks[i].startnode, &tracks[i].endnode, &tracks[i].minutes);
}
for (i = 0; i < lines; i++) {
printf("%d ", tracks[i].number);
printf("%d ", tracks[i].startnode);
printf("%d ", tracks[i].endnode);
printf("%d\n", tracks[i].minutes);
}
}
}
具体来说，它发生在以下行:
fscanf(fp, "%d %d %d %d\n", &tracks[i].number, &tracks[i].startnode, &tracks[i].endnode, &tracks[i].minutes);
该函数在以下函数中被调用(案例 3):
void get_file(char textfilename[], int optnumber) {
struct node *nodes;
struct track *tracks;
struct course *courses;
struct entrant *entrants;
struct checkpointdata *checkpointdatas;
char filename[20]; //Array of char for filename
printf("Enter the name of the %s text file(with file extension) :", textfilename);
scanf(" %[a-zA-Z._1-9]", &filename);
switch (optnumber) {
case 1:
process_name(filename);
break;
case 2:
process_node(filename, nodes);
break;
case 3:
process_track(filename, tracks);
break;
case 4:
process_course(filename, courses);
break;
case 5:
process_entrant(filename, entrants);
break;
case 6:
process_checkpointdata(filename, checkpointdatas);
break;
}
}
它读取第一行没问题，但之后就失败了。由于其他“process_[data]”非常相似，我也试过了。有些会正常工作，有些也会出现异常，有些会在输出时检索垃圾。
我该如何解决这个问题，或者如何分配内存使其不与预分配的内存冲突(如果这确实是问题所在)？