code: Работа с буфером, загруженным по сети

histogram.cpp

@@ -27,7 +27,7 @@ find_minmax(const vector<double>& numbers, double& min, double& max) {
    return flag;
 }
 
-vector<size_t> make_histogram(const vector<double> numbers, size_t bin_count, bool& flag){
+vector<size_t> make_histogram(const vector<double> numbers, size_t bin_count){
     vector<size_t> bins(bin_count);
     double max, min = 0;
     find_minmax(numbers, min, max);

histogram.h

@@ -4,6 +4,6 @@
 #include <vector>
 
 std::vector<size_t>
-make_histogram(const std::vector<double> numbers, size_t bin_count, bool& flag);
+make_histogram(const std::vector<double> numbers, size_t bin_count);
 
 #endif // HISTOGRAM_H_INCLUDED

main.cpp

@@ -6,6 +6,8 @@
 #include <text.h>
 #include <svg.h>
 #include <curl/curl.h>
+#include <sstream>
+
 
 
 using namespace std;
@@ -23,7 +25,7 @@ Input
 input_data(istream& in, bool prompt) {
     if (prompt == true){
     size_t number_count;
-    cerr << "amount of numbers";
+    cerr << "input number count";
     in >> number_count;
     Input inn;
     inn.numbers.resize(number_count);
@@ -34,14 +36,13 @@ input_data(istream& in, bool prompt) {
     }
 
 size_t bin_count;
-cerr << "amount of baskets";
+cerr << "input amount of bins";
 in >> inn.bin_count;
 return inn;
     }
-
-    else if (prompt == false) {
+    else {
     size_t number_count;
-    cout << "amount of numbers";
+    cout << "input number count";
     in >> number_count;
     Input inn;
     inn.numbers.resize(number_count);
@@ -52,35 +53,58 @@ return inn;
     }
 
     size_t bin_count;
-cout << "input baskets";
+    cout << "input amount of bins";
     in >> inn.bin_count;
     return inn;
     }
 }
 
+static 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)
+    {
+        CURLcode res;
+        const char* res2;
+        curl_easy_setopt(curl, CURLOPT_URL, address.c_str());
+        curl_easy_setopt(curl, CURLOPT_WRITEFUNCTION, write_data);
+        curl_easy_setopt(curl, CURLOPT_WRITEDATA, &buffer);
+        res = curl_easy_perform(curl);
+        if (res!=0)
+        {
+            res2=curl_easy_strerror(res);
+            cout<<res2<<endl;
+            exit(1);
+        }
+        curl_easy_cleanup(curl);
+    }
+    curl_global_init(CURL_GLOBAL_ALL);
+    return input_data(buffer, true);
+}
 
 
 
 int main(int argc, char* argv[])
 {
 
+    Input in;
     CURL *curl = curl_easy_init();
-    if(curl) {
-    CURLcode res;
-    curl_easy_setopt(curl, CURLOPT_URL, "http://uit.mpei.ru/study/courses/cs/lab03/marks.txt");
-    res = curl_easy_perform(curl);
-    curl_easy_cleanup(curl);
-
-        return 0;
+    if (argc > 1) {
+     in = download(argv[1]);
+    } else {
+        in = input_data(cin, true);
     }
-
-
-    bool flag;
-    bool prompt;
-    prompt = true;
-    auto inn = input_data(cin, prompt);
-    auto bins = make_histogram(inn.numbers, inn.bin_count, flag);
-    auto procent = make_histogram_proc(inn.numbers, inn.bin_count, bins);
+    auto bins = make_histogram(in.numbers, in.bin_count);
+    auto procent = make_histogram_proc(in.numbers, in.bin_count, bins);
     show_histogram_svg(bins, procent);
 
     return 0;