code: сохранение данных из сети в буфер

main.cpp

@@ -1,6 +1,7 @@
 #include <iostream>
 #include <vector>
 #include <string>
+#include <sstream>
 #include "histogram.h"
 //#include "text.h"
 #include "svg.h"
@@ -36,26 +37,42 @@ input_data(istream& in_stream,bool prompt) {
 
     for (size_t i = 0; i < in.bin_count; i++) {
         in_stream >> in.colors[i];
+        //in.colors[i]="red";
         bool check = check_color(in.colors[i]);
         while (!check) {
         if (prompt) cerr << "Incorrect input. Color doesn't contain # or has spaces." << endl;
         in_stream >> in.colors[i];
+        //in.colors[i]="red";
         check = check_color(in.colors[i]);
         }
     }
     return in;
 }
 
-int main(int argc, char* argv[])
-{
-    if (argc > 1)
+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;
+}
+
+size_t write_header(char* buffer, size_t size, size_t nitems, void* userdata)
 {
-        //cerr<<argc<<endl;
-        //for (size_t i = 0; argv[i]; i++) cerr<<argv[i]<<endl;
+    return size * nitems;
+}
+
+Input download(const string& address) {
+    curl_global_init(CURL_GLOBAL_ALL);
+    stringstream buffer;
+
     CURL* curl = curl_easy_init();
     if (curl) {
         CURLcode res;
-            curl_easy_setopt(curl, CURLOPT_URL, argv[1]);
+        curl_easy_setopt(curl, CURLOPT_URL, address.c_str());
+        curl_easy_setopt(curl, CURLOPT_WRITEFUNCTION, write_data);
+        curl_easy_setopt(curl, CURLOPT_WRITEDATA, &buffer);
+        curl_easy_setopt(curl, CURLOPT_HEADERFUNCTION, write_header);
+        curl_easy_setopt(curl, CURLOPT_HEADERDATA, NULL);
         res = curl_easy_perform(curl);
         curl_easy_cleanup(curl);
         if (res != CURLE_OK) {
@@ -63,10 +80,21 @@ int main(int argc, char* argv[])
             exit(1);
         }
     }
-        return 0;
+
+    return input_data(buffer, false);
+}
+
+int main(int argc, char* argv[])
+{
+    Input in;
+    if (argc > 1)
+    {
+        in = download(argv[1]);
+    }
+    else
+    {
+        in = input_data(cin,true);
     }
-    curl_global_init(CURL_GLOBAL_ALL);
-    auto in = input_data(cin,true);
     vector<size_t> bins = make_histogram(in.numbers, in.bin_count);
     //show_histogram_text(bins, in.bin_count);
     show_histogram_svg(bins, in.colors);