什么是二进制文件，我如何创建？ [英] What's a binary file and how do I create one?

问题描述

我想创建一个二进制文件重新presenting一个整数。我认为该文件应为4个字节。我使用Linux操作系统。怎么做？
另外一个问题：我如何该文件的内容分配到一个整数用C

I would like to create a binary file representing an integer. I think the file should be 4 bytes. I use linux. How to do that? Another question: How do I assign the content of that file to an integer in C?

推荐答案

在标准C， fopen（）函数允许模式WB写（和RB阅读）以二进制方式，即：

In standard C, fopen() allows the mode "wb" to write (and "rb" to read) in binary mode, thus:

#include <stdio.h>

int main() {
    /* Create the file */
    int x = 1;
    FILE *fh = fopen ("file.bin", "wb");
    if (fh != NULL) {
        fwrite (&x, sizeof (x), 1, fh);
        fclose (fh);
    }

    /* Read the file back in */
    x = 7;
    fh = fopen ("file.bin", "rb");
    if (fh != NULL) {
        fread (&x, sizeof (x), 1, fh);
        fclose (fh);
    }

    /* Check that it worked */
    printf ("Value is: %d\n", x);

    return 0;
}

此输出：

Value is: 1

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