Modern C++ Programming Cookbook

How to do it...

To write the content of a buffer (in our example, an std::vector) to a binary file, you should perform the following steps:

1. Open a file stream for writing in binary mode by creating an instance of the std::ofstream class:

        std::ofstream ofile("sample.bin", std::ios::binary);

2. Ensure that the file is actually open before writing data to the file:

        if(ofile.is_open())        {          // streamed file operations        }

3. Write the data to the file by providing a pointer to the array of characters and the number of characters to write:

        ofile.write(reinterpret_cast<char*>(output.data()),                     output.size());

4. Flush the content of the stream buffer to the actual disk file; this is automatically done when you close the stream:

 ofile.close();  ...