Text-based Browser (like Lynx) Gaming Project in C++

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3 months ago

#include <iostream>
#include <string>
#include <curl/curl.h>

using namespace std;

// Callback function to handle the data received from libcurl
size_t writeCallback(void* contents, size_t size, size_t nmemb, string* buffer) {
    size_t totalSize = size * nmemb;
    buffer->append((char*)contents, totalSize);
    return totalSize;
}

// Function to fetch and display the content from a URL
void fetchAndDisplayContent(const string& url) {
    CURL* curl;
    CURLcode res;
    string content;

    curl = curl_easy_init();
    if (curl) {
        curl_easy_setopt(curl, CURLOPT_URL, url.c_str());
        curl_easy_setopt(curl, CURLOPT_WRITEFUNCTION, writeCallback);
        curl_easy_setopt(curl, CURLOPT_WRITEDATA, &content);

        // Perform the request
        res = curl_easy_perform(curl);
        if (res != CURLE_OK) {
            cerr << "curl_easy_perform() failed: " << curl_easy_strerror(res) << endl;
        } else {
            cout << "Fetched content:\n" << content << endl;
        }

        // Cleanup
        curl_easy_cleanup(curl);
    }
}

int main() {
    string url;

    cout << "Enter the URL to fetch: ";
    getline(cin, url);

    fetchAndDisplayContent(url);

    return 0;
}

#include <iostream>

#include <string>

#include <curl/curl.h>

using namespace std;

// Callback function to handle the data received from libcurl

size_t writeCallback(void* contents, size_t size, size_t nmemb, string* buffer) {

size_t totalSize = size * nmemb;

buffer->append((char*)contents, totalSize);

return totalSize;

}

// Function to fetch and display the content from a URL

void fetchAndDisplayContent(const string& url) {

CURL* curl;

CURLcode res;

string content;

curl = curl_easy_init();

if (curl) {

curl_easy_setopt(curl, CURLOPT_URL, url.c_str());

curl_easy_setopt(curl, CURLOPT_WRITEFUNCTION, writeCallback);

curl_easy_setopt(curl, CURLOPT_WRITEDATA, &content);

// Perform the request

res = curl_easy_perform(curl);

if (res != CURLE_OK) {

cerr << "curl_easy_perform() failed: " << curl_easy_strerror(res) << endl;

} else {

cout << "Fetched content:\n" << content << endl;

}

// Cleanup

curl_easy_cleanup(curl);

}

int main() {

string url;

cout << "Enter the URL to fetch: ";

getline(cin, url);

fetchAndDisplayContent(url);

return 0;

}

Explanation

libcurl:
- The program uses the libcurl library to handle HTTP requests. libcurl is a widely used library for transferring data with URLs and supports various protocols, including HTTP and HTTPS.
writeCallback Function:
- This is a callback function that libcurl uses to store the data it receives. It appends the received data to a std::string
  
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  buffer, which is then used to display the content.
fetchAndDisplayContent Function:
- This function initializes libcurl, sets the URL to be fetched, and assigns the callback function to handle the incoming data.
- The content fetched from the URL is stored in the content string and then displayed.
Main Function:
- The main() function prompts the user to enter a URL, which is then passed to fetchAndDisplayContent() to retrieve and display the content.

Notes:

Limitations: This basic example only handles plain text content and doesn’t parse or render HTML, CSS, or JavaScript. For a fully functional text-based browser, you would need to implement an HTML parser and a text renderer.

libcurl Installation: You need to have libcurl installed and linked to your project. On most Linux distributions, you can install it using a package manager (e.g., sudo apt-get install libcurl4-openssl-dev).
Extensions: You could extend this program to support HTML parsing, navigation through hyperlinks, history management, and more to create a more feature-complete text-based browser.

Explanation

Notes:

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