c - 如何在C中获取文件大小？ [重复](How can I get a file's size in C? [duplicate])

Question

Possible Duplicate:

(可能重复：)
How do you determine the size of a file in C?

(如何确定C中文件的大小？)

How can I find out the size of a file I opened with an application written in C ?

(如何找出用C语言编写的应用程序打开的文件大小？)

I would like to know the size, because I want to put the content of the loaded file into a string, which I allocate using malloc() .

(我想知道大小，因为我想将加载文件的内容放入一个字符串，我使用malloc()分配。)

Just writing malloc(10000*sizeof(char));

(只写malloc(10000*sizeof(char));)

is IMHO a bad idea.

(恕我直言是一个坏主意。)

  ask by Nino translate from so

Answer 1

You need to seek to the end of the file and then ask for the position:

(您需要寻找文件的末尾然后询问位置：)

fseek(fp, 0L, SEEK_END);
sz = ftell(fp);

You can then seek back, eg:

(然后你可以回头，例如：)

fseek(fp, 0L, SEEK_SET);

or (if seeking to go to the beginning)

(或者（如果想要开始）)

rewind(fp);