fread返回零 [英] fread returns zero
本文介绍了fread返回零的处理方法,对大家解决问题具有一定的参考价值,需要的朋友们下面随着小编来一起学习吧!
问题描述
我有一个将rom文件读入内存并自动分配以适合该文件的函数,但是每次我尝试从文件描述符中读取时,fread()都会返回零.我不确定自己在做什么错.有人可以帮忙吗?
I have a function that reads a rom file into memory and automatically allocates to fit the file but every time I try to read from the file descriptor, fread() returns zero. I'm unsure what I'm doing wrong. can anybody help?
int read_rom(const char *filename, unsigned char ***rom) {
int rom_size;
FILE *fd = NULL;
if((fd = fopen(filename, "r")) != NULL) {
fseek(fd, 0, SEEK_END);
rom_size = ftell(fd);
(*rom) = malloc(rom_size);
int read = fread(rom, 1, rom_size, fd);
fclose(fd);
printf("read: %d\n", read);
return rom_size;
}
return -1;
}
int main(int argc, char **argv) {
unsigned char rom_size = 0;
unsigned char **rom = NULL;
rom_size = read_rom(argv[1], &rom);
return 1;
}
有没有人?
推荐答案
您没有读取任何内容,因为您 fread
之前,先执行 fseek(fd,0,SEEK_SET);
返回文件的开头.
You aren't reading anything in because you fseek
ed to the end of the file. Do a fseek(fd, 0, SEEK_SET);
to return to the beginning of the file before you fread
.
这篇关于fread返回零的文章就介绍到这了,希望我们推荐的答案对大家有所帮助,也希望大家多多支持IT屋!
查看全文