用C ++读写二进制文件 [英] Reading and writing binary files in C++

问题描述

我对C ++还是陌生的，从昨天开始只有几个小时的自学时间. 因此:

I am entirely new to C++ with just a couple of hours self-teaching, that started yesterday. SO:

我有一个未压缩的简单beep.wav文件，大约只有3秒钟长，并且只有一个蜂鸣声.

I have a uncompressed simple beep.wav file, just about 3 seconds long with a single beeping sound in it.

我最终想要实现的是，仅读取文件，同时写入二进制数据，所有数据包括:标头， ftm 和 data 或所有十六进制可读数据，并将其转储到简单的beep.txt文件中.

What I am ultimately trying to achieve is, just to read the file, and at the same time write the binary data, all including: the header, ftm and data or all that is hex readable data and dump it into a simple beep.txt file.

在C ++中有可能吗?如果是这样，我应该如何开始读取和转储二进制文件?

使用<fstream>类

#include <iostream>
#include <fstream>

   int main()
   {
       ifstream myfile ("beep.wav", ios::in|ios::binary|ios::ate);
       if (myfile.is_open())
       {
        //reading goes here
        }
       return 0;
    }

推荐答案

如yzt所述，您需要提前了解.wav中的内容和顺序.据我所知，您将获得标签，标头和值(样本)以及压缩信息.因此，首先开始:

As mentioned by yzt, you need to know by advance what's in your .wav and in which order. As far as I know, you will have tags, headers and values (samples) as well as compression informations. So, to give a start :

例如，如果您知道第一件事就是读取压缩率，则可以通过提取开始压缩过程，该过程可能是double:

If you know, by example, that the very first thing to do is to read the compression rate, you'll start your reading process by extracting may be a double :

ifstream myfile("beep.wav", ios::in|ios::binary);

double compression_rate;
myfile.read((char*)&compression_rate, sizeof(compression_rate));

// As well as probably the sample rate...
double sample_rate;
myfile.read((char*)&sample_rate, sizeof(sample_rate));

然后是样本数:

int nb_samples;
myfile.read((char*)&nb_samples, sizeof(nb_samples));

然后，这些样本的值...(在此存储为double的vector)

Then, the values for those samples... (here stored as a vector of double)

vector<double> vect;
vect.resize(nb_samples);
myfile.read((char*)&vect[0], nb_samples * sizeof(double));

等等...

但是，您再次打开的<​​c4>是由什么组成的?

But again, what the .wav you opened is made of ?

一旦您完全掌握了内容，就可以采取另一种方式，从头开始编写自己的.wav ...

Once you completely master the content, you can go the other way and start writing your own .wav from scratch...

入门 -和此处.

Getting started - and here.

字节-验尸" PCM Wav文件.

Bytes - "Autopsy" of a PCM Wav file.

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