所以问题在这里,我正在读取我的游戏的一个级别文件,在Linux下运行良好:
@0
@12
200x200 version 3
@16
973 blocks
@989
@993
18 zones
但在Windows下,我得到了以下结果:
@0
@212
200x200 version 3
@216
973 blocks
@1200
@1204
18 zones
嗯?Windows的ftell从偏移量200开始?读取文件似乎产生了相同的数据,但是fread使用ftell的值来确定文件中还剩下多少字节可以读取。因此,当在文件末尾读取时,我遇到了问题:
@1425
zone#9 2x3 @ 66/9
@1425
zone#10 2x3 @ 66/9
@1425
zone#11 2x3 @ 66/9
@1425
zone#12 2x3 @ 66/9
@1425
zone#13 2x3 @ 66/9
@1425
zone#14 2x3 @ 66/9
etc.
这是对应的代码(目前因为所有调试打印而有些丑陋..):
void fread_all(void *ptr, size_t size, size_t count, FILE *stream) {
fread(ptr, size, count, stream);
printf("@%ld\n", ftell(stream));
}
bool map_load(struct Map *map, const char *file_name) {
FILE *fp = fopen(file_name, "r");
if (fp != NULL) {
fseek(fp, 0, SEEK_SET);
printf("@%ld\n", ftell(fp));
// Header
int *header = (int*)calloc(sizeof(int), 3);
fread_all(header, sizeof(int), 3, fp);
printf("%dx%d version %d\n", header[0], header[1], header[2]);
map->pos_x = 0;
map->pos_y = 0;
map->map_x = 0;
map->map_y = 0;
map->size_x = header[0];
map->size_y = header[1];
map_zones_remove(map);
free(header);
// Blocks
unsigned int *block_size = (unsigned int*)malloc(sizeof(unsigned int));
fread_all(block_size, sizeof(int), 1, fp);
printf("%d blocks\n", *block_size);
unsigned char *block_data = (unsigned char*)calloc(sizeof(unsigned char), *block_size);
fread_all(block_data, sizeof(unsigned char), *block_size, fp);
unsigned char *tmp = map->blocks;
map->blocks = rle_decode(block_data, *block_size);
free(tmp);
free(block_size);
free(block_data);
// Zones
int *zone_count = (int*)malloc(sizeof(int));
fread_all(zone_count, sizeof(int), 1, fp);
printf("%d zones\n", *zone_count);
int *d = (int*)calloc(sizeof(int), 6);
for(int i = 0, l = *zone_count; i < l; i++) {
fread_all(d, sizeof(int), 6, fp);
map_zone_create(map, d[0], d[1], d[2], d[3], d[4], d[5]);
printf("zone#%d %dx%d @ %d/%d\n", i, d[2], d[3], d[0], d[1]);
}
map_platforms_create(map);
free(zone_count);
free(d);
fclose(fp);
return true;
}
return false;
}
我真的不知道这里发生了什么。编译器是Visual Studio 10和Linux下的GCC 4.4。