如何将文本文件复制到C中的字符串? [英] How to copy text file to string in C?

问题描述

I need to copy the contents of a text file to a dynamically-allocated character array.

My problem is getting the size of the contents of the file; Google reveals that I need to use fseek and ftell, but for that the file apparently needs to be opened in binary mode, and that gives only garbage.

EDIT: I tried opening in text mode, but I get weird numbers. Here's the code (I've omitted simple error checking for clarity):

long f_size;
char* code;
size_t code_s, result;
FILE* fp = fopen(argv[0], "r");
fseek(fp, 0, SEEK_END);
f_size = ftell(fp); /* This returns 29696, but file is 85 bytes */
fseek(fp, 0, SEEK_SET);
code_s = sizeof(char) * f_size;
code = malloc(code_s);
result = fread(code, 1, f_size, fp); /* This returns 1045, it should be the same as f_size */

解决方案

The root of the problem is here:

FILE* fp = fopen(argv[0], "r");

argv[0] is your executable program, NOT the parameter. It certainly won't be a text file. Try argv[1], and see what happens then.

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