使用 C++ REST SDK 進行網路編程

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安裝 C++ REST SDK

$ brew install cpprestsdk$ brew install boost$ brew install libressl

建立工程

開啟 Xcode，File / New / Project...
在嚮導的第1頁選 macOS / Command Line Tool
在嚮導的第2頁語言選 C++，Product Name 填上任意名稱
在嚮導的第3頁選擇任意檔案夾，點擊 Create 建立工程。

配置工程

將 System Header Search Paths 設定為
/usr/local/Cellar/cpprestsdk/2.10.2/include
/usr/local/Cellar/boost/1.67.0_1/include
/usr/local/Cellar/libressl/2.7.4/include

將 Library Search Paths 設定為
/usr/local/Cellar/cpprestsdk/2.10.2/lib
/usr/local/Cellar/boost/1.67.0_1/lib
/usr/local/Cellar/libressl/2.7.4/lib

將 Other Linker Flags 設定為
-lcpprest -lboost_system -lboost_thread-mt -lboost_chrono-mt -lssl -lcrypto

cpprestsdk: Undefined symbols for architecture x86_64

C++ 代碼

#include <cpprest/http_client.h>#include <cpprest/filestream.h>using namespace utility;                    // Common utilities like string conversionsusing namespace web;                        // Common features like URIs.using namespace web::http;                  // Common HTTP functionalityusing namespace web::http::client;          // HTTP client featuresusing namespace concurrency::streams;       // Asynchronous streamsint main(int argc, char* argv[]){    auto fileStream = std::make_shared<ostream>();    // Open stream to output file.    pplx::task<void> requestTask = fstream::open_ostream(U("results.html")).then([=](ostream outFile)    {        *fileStream = outFile;        // Create http_client to send the request.        http_client client(U("http://www.bing.com/"));        // Build request URI and start the request.        uri_builder builder(U("/search"));        builder.append_query(U("q"), U("cpprestsdk github"));        return client.request(methods::GET, builder.to_string());    })    // Handle response headers arriving.    .then([=](http_response response)    {        printf("Received response status code:%u\n", response.status_code());        // Write response body into the file.        return response.body().read_to_end(fileStream->streambuf());    })    // Close the file stream.    .then([=](size_t)    {        return fileStream->close();    });    // Wait for all the outstanding I/O to complete and handle any exceptions    try    {        requestTask.wait();    }    catch (const std::exception &e)    {        printf("Error exception:%s\n", e.what());    }    return 0;}

使用 C++ REST SDK 進行網路編程