Сохранение данных из сети в буфер

main.cpp

@@ -1,29 +1,90 @@
-#include <curl/curl.h>
-#define CURL_STATICLIB
 #include <iostream>
+#include <sstream>//Ôàéë <sstream> ïîäêëþ÷àåò stringstream — ïîòîê, êîòîðûé ìîæåò ÷èòàòü èç áóôåðà â ïàìÿòè
+#include <string>
 #include <vector>
-#include "histogram.h"
+#include <curl/curl.h>
+#include "hictogram.h"
 #include "text.h"
 #include "svg.h"
 
-int main(int argc, char* argv[]) {
+using namespace std;
-    if (argc > 1) {
+
-        cout << "argc = " << argc << endl;
+struct Input {
-        for (int i = 0; i < argc; ++i) {
+    vector<double> numbers;
-            cout << "argv[" << i << "] = \"" << argv[i] << "\"" << endl;
+    size_t bin_count{};
+};
+
+Input input_data(istream& in, bool prompt) {
+
+    if (prompt) {
+        cerr << "Enter number count, numbers and bin count: ";
     }
+
+    size_t number_count;
+    in >> number_count;
+
+    Input input;
+    input.numbers.resize(number_count);
+
+    for (size_t i = 0; i < number_count; i++) {
+        in >> input.numbers[i];
+    }
+
+    in >> input.bin_count;
+
+    return input;
+}
+
+
+
+size_t write_data(void* items, size_t item_size, size_t item_count, void* ctx) {
+    size_t data_size = item_size * item_count;
+
+    stringstream* buffer = reinterpret_cast<stringstream*>(ctx);
+
+    buffer->write(reinterpret_cast<const char*>(items), data_size);
+
+    return data_size;
+}
+
+Input download(const string& address) {
+    stringstream buffer;
+
+    CURL* curl = curl_easy_init();
+    if (curl) {
+        curl_easy_setopt(curl, CURLOPT_URL, address.c_str());
+
+        curl_easy_setopt(curl, CURLOPT_WRITEFUNCTION, write_data);
+        curl_easy_setopt(curl, CURLOPT_WRITEDATA, &buffer);
+
+        CURLcode res = curl_easy_perform(curl);
+
+        if (res != CURLE_OK) {
+            cerr << "cURL error: " << curl_easy_strerror(res) << endl;
+            curl_easy_cleanup(curl);
+            exit(1);
+        }
+
+        curl_easy_cleanup(curl);
+    } else {
+        cerr << "curl_easy_init() failed" << endl;
+        exit(1);
+    }
+
+    return input_data(buffer, false);
+}
+
+int main(int argc, char* argv[]) {
+    Input input;
+
+    if (argc > 1) {
+        input = download(argv[1]);
+    } else {
+        input = input_data(cin, true);
+    }
+
+    const auto bins = make_histogram(input.numbers, input.bin_count);
+    show_histogram_svg(bins);
+
     return 0;
 }
-
-    CURLcode res = curl_global_init(CURL_GLOBAL_ALL);
-    if (res != CURLE_OK) {
-        cerr << "cURL initialization failed: " << curl_easy_strerror(res) << endl;
-        return 1;
-    }
-
-    auto in = input_data();
-    auto bins = make_histogram(in.numbers, in.bin_count);
-    show_histogram_svg(bins, in.block_width);
-
-    curl_global_cleanup();
-}