C，从bin文件中读取二进制文件 [英] C, fread binary from bin file

问题描述

我刚接触C，但是遇到了fread问题...

我的最终目标是从.bin文件中读取二进制文件(然后将其打印为控制台文件)，但现在我一次只将其迈出一步，并尝试仅读取第一位...

我的代码:

...
FILE *file = fopen("test1.bin", rb);
int i = 0;
fread(&i, 1, 1, file);
printf("%i\n", i);
...

现在我已经在三个不同的.bin文件上进行了尝试，一个文件输出0，其他文件输出2，其他文件输出12！

当我仅从文件中读取1位时，为什么它输出2/12?它不应该是0或1吗?我究竟做错了什么?非常感谢.

解决方案

更改> c0> 呼叫:

fread(&i, sizeof(int), 1, file);

第二个参数是要读取的元素的大小，第三个参数是要读取的元素的数目.发布的代码正在将单个字节读入int.

您还应该检查fopen()和fread()调用的返回值，以确保它们成功.

I'm pretty new to C, but I have come across a problem with fread...

My end goal is to read (and then printf to console) the binary from a .bin file, but for now i'm taking it one step at a time and trying to just read the first bit...

My code:

...
FILE *file = fopen("test1.bin", rb);
int i = 0;
fread(&i, 1, 1, file);
printf("%i\n", i);
...

Now i've tried this on three different .bin files, one outputted 0, other 2 and the other 12!

Why is it outputting 2/12 when I am reading in just one 1 bit from file? Shouldn't it be a 0 or a 1? what am I doing wrong? Thanks alot.

解决方案

Change the fread() call to:

fread(&i, sizeof(int), 1, file);

The second argument is the size of an element to read, the third argument is the number of elements to read. The posted code is reading a single byte into an int.

You should also check the return values from fopen() and fread() calls to ensure they were successful.

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