How to write an array of binary to a file

Question

I have an array of bytes as integers in base 256. So it looks like [0, 120, 255, 30, 21]. Each number represents a byte, so like 0 = 0000000, 1 = 0000001, 2 = 00000010, etc...

How can I write this array to a file? I am really lost I don't know where to begin with this.

How do you have "an array of bytes in base 256"? Do you have strings that shall be converted? Or do you really have an array of bytes (i. e. unsigned chars) - in which case, there's no base-256 whatsoever? — user529758
– user529758, Commented Aug 21, 2013 at 5:25

Jin Chen · Accepted Answer · 2013-08-21 05:26:24Z

2

Here is a simple example:

#include <fstream.h>

char buffer[100] = {0, 120, 255, 30, 21, ... };
ofstream myFile ("data.bin", ios::out | ios::binary);
myFile.write (buffer, 100);

answered Aug 21, 2013 at 5:26

Jin Chen

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Summer_More_More_Tea · Accepted Answer · 2013-08-21 05:22:39Z

0

You can open the file in binary mode in C++ with fstream like this http://www.cplusplus.com/forum/general/11272/.

Or open a file in C compatible fashion,

fopen("test.bin", "bw+");

answered Aug 21, 2013 at 5:22

Summer_More_More_Tea

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Paul Evans · Accepted Answer · 2013-08-21 05:27:38Z

0

You want something like:

ofstream my_bin_file;
my_bin_file.open("filename.bin", ios::out | ios::binary);
// some loop to get your int byte's
    my_bin_file << byte;
my_bin_file.close();

answered Aug 21, 2013 at 5:27

Paul Evans

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