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Chapter 12: Problem 29

The ___ member function reads "raw" binary data from a file.

Short Answer

Expert verified
Answer: The purpose of the `read` function is to read a specified number of bytes of raw binary data directly from a file into a buffer, without any formatting or interpretation applied. This functionality is useful when working with binary files, where data is not stored as printable text but as raw binary values.

Step by step solution

01

Identify the member function

The member function in question is the `read` function in the C++ standard library, which is specifically designed to read raw binary data from a file.
02

Explain the purpose of the `read` function

The purpose of the `read` function is to read a specified number of bytes of raw binary data directly from a file into a buffer, without any formatting or interpretation applied. This functionality is useful when working with binary files, where data is not stored as printable text but as raw binary values.
03

Describe how to use the `read` function

To use the `read` function, you will first need to include the necessary libraries and open a binary file using an input file stream (`ifstream`). After that, you will specify a buffer to store the data and read the data by calling the `read` function. Here is an example of using the `read` function to read raw binary data from a file: ```cpp #include #include int main() { std::ifstream input_file("example.bin", std::ios::binary); // Open the binary file example.bin if (!input_file) { std::cerr << "Error opening file!" << std::endl; return 1; } const int buffer_size = 1024; // Define the buffer size char buffer[buffer_size]; // Create a buffer to store the data input_file.read(buffer, buffer_size); // Read the data into the buffer // Process the data (for example, output the first 10 bytes) for (int i = 0; i < 10; ++i) { std::cout << static_cast(buffer[i]) << " "; } input_file.close(); // Close the file return 0; } ``` In this example, we open a binary file named "example.bin", create a buffer of 1024 bytes, read the data from the file into the buffer, and output the first 10 bytes as integers. Remember to close the file after using it.

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Most popular questions from this chapter

In __ file access, the contents of the file are read in the order they appear in the file, from the file's start to its end.

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