{"id":2731,"date":"2018-03-13T01:30:50","date_gmt":"2018-03-12T23:30:50","guid":{"rendered":"http:\/\/mariusbancila.ro\/blog\/?p=2731"},"modified":"2018-04-20T10:29:31","modified_gmt":"2018-04-20T08:29:31","slug":"using-curl-library-from-c-on-windows","status":"publish","type":"post","link":"https:\/\/mariusbancila.ro\/blog\/2018\/03\/13\/using-curl-library-from-c-on-windows\/","title":{"rendered":"Using the curl library from C++ on Windows"},"content":{"rendered":"<p><a href=\"https:\/\/curl.haxx.se\/\">curl<\/a> is a project containing a command line tool and a library that can be used to transfer data using a variety of protocols, including, of course, HTTP and HTTPS. The library API is written in C, but there are various C++ wrappers on top of it. One of those is <a href=\"https:\/\/github.com\/JosephP91\/curlcpp\">curlcpp<\/a>. In this article, I will show how to build these libraries for Windows with Visual Studio.<br \/>\n<!--more--><\/p>\n<p>Here is an example, using curlcpp, of how to get weather data from <a href=\"https:\/\/openweathermap.org\">https:\/\/openweathermap.org<\/a>.<\/p>\n<pre class=\"lang:c++ decode:true \" >#include \"curl_easy.h\"\r\n#include \"curl_form.h\"\r\n#include \"curl_ios.h\"\r\n#include \"curl_exception.h\"\r\n\r\nstd::stringstream get_response(std::string_view url)\r\n{\r\n   std::stringstream str;\r\n   try\r\n   {\r\n      curl::curl_ios&lt;std::stringstream&gt; writer(str);\r\n      curl::curl_easy easy(writer);\r\n\r\n      easy.add&lt;CURLOPT_URL&gt;(url.data());\r\n      easy.add&lt;CURLOPT_FOLLOWLOCATION&gt;(1L);\r\n\r\n      easy.perform();\r\n   }\r\n   catch (curl::curl_easy_exception const &amp; error)\r\n   {\r\n      auto errors = error.get_traceback();\r\n      error.print_traceback();\r\n   }\r\n\r\n   return str;\r\n}\r\n\r\nint main()\r\n{\r\n   using namespace std::string_literals;\r\n\r\n   auto appid = \"0c7978...\"s;\r\n   auto location = \"Timisoara\"s;\r\n   auto url = \"https:\/\/api.openweathermap.org\/data\/2.5\/weather?q=\" + location + \"&amp;appid=\" + appid;\r\n\r\n   auto json = get_response(url);\r\n\r\n   std::cout &lt;&lt; json.str() &lt;&lt; std::endl;\r\n\r\n   return 0;\r\n}<\/pre>\n<p>Here is how you get this working on Windows using Visual Studio 2017. The following instructions are for 32-bit version, but you can do the same for 64-bit.<\/p>\n<p>For libcurl:<\/p>\n<ul>\n<li>Download CURL from <a href=\"https:\/\/curl.haxx.se\/download.html\">https:\/\/curl.haxx.se\/download.html<\/a>.<\/li>\n<li>Unzip and open the solution <tt>projects\\Windows\\VC15\\curl-all.sln<\/tt>.<\/li>\n<li>Build configurations <tt>LIB Release - DLL Windows SSPI<\/tt> and <tt>LIB Debug - DLL Windows SSPI<\/tt> for the target platform that you need (Win32 or x64)<\/li>\n<li>Copy the output to <tt>build\\lib\\x86\\<\/tt> (or <tt>build\\lib\\x64\\<\/tt>). To have both release and debug builds in the same folder name the debug one <tt>libcurld.lib<\/tt>.<\/li>\n<\/ul>\n<p>For curlcpp:<\/p>\n<ul>\n<li>Clone or download CURLCPP from <a href=\"https:\/\/github.com\/JosephP91\/curlcpp\">https:\/\/github.com\/JosephP91\/curlcpp<\/a>.<\/li>\n<li>Create a subfolder called <tt>build<\/tt> in the project&#8217;s main folder.<\/li>\n<li>Execute <tt>CMake<\/tt> from the <tt>build<\/tt> folder to create a Visual Studio solution. Here is an example that assums curl is in the same folder as curlcpp.\n<pre class=\"lang:default decode:true \" >cmake -G \"Visual Studio 15 2017\" .. -DCURL_LIBRARY=..\\curl\\build\\lib\\x86\\libcurld.lib -DCURL_INCLUDE_DIR=..\\curl\\include<\/pre>\n<\/li>\n<li>Open the generated project and build it.<\/li>\n<li>Copy the output to <tt>lib\\x86<\/tt> (where <tt>lib<\/tt> is a subfolder in the curlcpp project main folder). To be able to have both Debug and Release builds in the same folder rename the Debug build to <tt>curlcppd.lib<\/tt>.<\/li>\n<\/ul>\n<p>For your project using libcurl and curlcpp:<\/p>\n<ul>\n<li>Add <tt>CURL_STATICLIB<\/tt> to the preprocessor definitions.<\/li>\n<li>Add <tt>curl\\include<\/tt> and <tt>curlcpp\\include<\/tt> to the list of Additional Include Directories. (Make sure you include the correct relative paths.)<\/li>\n<li>Add curl and curlcpp output folders, <tt>curl\\build\\lib\\x86<\/tt> and <tt>curlcpp\\lib\\x86\\<\/tt>, to the Additional Library Directories.<\/li>\n<li>Add the following static libraries to the list of Additional dependencies: <tt>libcurld.lib;curlcppd.lib;Crypt32.lib;ws2_32.lib;winmm.lib;wldap32.lib;<\/tt><\/li>\n<\/ul>\n<p>Attached is a demo project with libcurl and curlcpp builds for both 32 and 64-bit platforms.<\/p>\n","protected":false},"excerpt":{"rendered":"<p><a href=\"https:\/\/curl.haxx.se\/\">curl<\/a> is a project containing a command line tool and a library that can be used to transfer data using a variety of protocols, including, of course, HTTP and HTTPS. The library API is written in C, but there are various C++ wrappers on top of it. One of those is <a href=\"https:\/\/github.com\/JosephP91\/curlcpp\">curlcpp<\/a>. In this article, I will show how to build these libraries for Windows with Visual Studio.<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_uag_custom_page_level_css":"","advgb_blocks_editor_width":"","advgb_blocks_columns_visual_guide":"","_jetpack_newsletter_access":"","_jetpack_dont_email_post_to_subs":false,"_jetpack_newsletter_tier_id":0,"_jetpack_memberships_contains_paywalled_content":false,"_jetpack_feature_clip_id":0,"_jetpack_memberships_contains_paid_content":false,"footnotes":"","jetpack_publicize_message":"","jetpack_publicize_feature_enabled":true,"jetpack_social_post_already_shared":true,"jetpack_social_options":{"image_generator_settings":{"template":"highway","default_image_id":0,"font":"","enabled":false},"version":2},"jetpack_post_was_ever_published":false},"categories":[7,10,8],"tags":[451,541,538,540,539,505,459],"class_list":["post-2731","post","type-post","status-publish","format-standard","hentry","category-c","category-visual-studio","category-windows-programming","tag-c","tag-cpp","tag-curl","tag-curlcpp","tag-libcurl","tag-vs2017","tag-windows"],"aioseo_notices":[],"aioseo_head":"\n\t\t<!-- All in One SEO 5.0.1.1 - aioseo.com -->\n\t<meta name=\"description\" content=\"Instructions of how to build and use libcurl and curlcpp from Windows using Visual Studio 2017.\" \/>\n\t<meta name=\"robots\" content=\"max-image-preview:large\" \/>\n\t<meta name=\"author\" content=\"Marius Bancila\"\/>\n\t<meta name=\"keywords\" content=\"curl,libcurl,curlcpp,cpp,vs2017,windows,c++\" \/>\n\t<link rel=\"canonical\" href=\"https:\/\/mariusbancila.ro\/blog\/2018\/03\/13\/using-curl-library-from-c-on-windows\/\" \/>\n\t<meta name=\"generator\" content=\"All in One SEO (AIOSEO) 5.0.1.1\" \/>\n\t\t<meta property=\"og:locale\" content=\"en_US\" \/>\n\t\t<meta property=\"og:site_name\" content=\"Marius Bancila&#039;s Blog | About code. Mostly on C++\" \/>\n\t\t<meta property=\"og:type\" content=\"article\" \/>\n\t\t<meta property=\"og:title\" content=\"Using the curl library from C++ on Windows\" \/>\n\t\t<meta property=\"og:description\" content=\"Instructions of how to build and use libcurl and curlcpp from Windows using Visual Studio 2017.\" \/>\n\t\t<meta property=\"og:url\" content=\"https:\/\/mariusbancila.ro\/blog\/2018\/03\/13\/using-curl-library-from-c-on-windows\/\" \/>\n\t\t<meta property=\"article:published_time\" content=\"2018-03-12T23:30:50+00:00\" \/>\n\t\t<meta property=\"article:modified_time\" content=\"2018-04-20T08:29:31+00:00\" \/>\n\t\t<meta name=\"twitter:card\" content=\"summary\" \/>\n\t\t<meta name=\"twitter:title\" content=\"Using the curl library from C++ on Windows\" \/>\n\t\t<meta name=\"twitter:description\" content=\"Instructions of how to build and use libcurl and curlcpp from Windows using Visual Studio 2017.\" \/>\n\t\t<script type=\"application\/ld+json\" class=\"aioseo-schema\">\n\t\t\t{\"@context\":\"https:\\\/\\\/schema.org\",\"@graph\":[{\"@type\":\"Article\",\"@id\":\"https:\\\/\\\/mariusbancila.ro\\\/blog\\\/2018\\\/03\\\/13\\\/using-curl-library-from-c-on-windows\\\/#article\",\"name\":\"Using the curl library from C++ on Windows\",\"headline\":\"Using the curl library from C++ on Windows\",\"author\":{\"@id\":\"https:\\\/\\\/mariusbancila.ro\\\/blog\\\/author\\\/admin\\\/#author\"},\"publisher\":{\"@id\":\"https:\\\/\\\/mariusbancila.ro\\\/blog\\\/#organization\"},\"datePublished\":\"2018-03-13T01:30:50+02:00\",\"dateModified\":\"2018-04-20T10:29:31+02:00\",\"inLanguage\":\"en-US\",\"commentCount\":17,\"mainEntityOfPage\":{\"@id\":\"https:\\\/\\\/mariusbancila.ro\\\/blog\\\/2018\\\/03\\\/13\\\/using-curl-library-from-c-on-windows\\\/#webpage\"},\"isPartOf\":{\"@id\":\"https:\\\/\\\/mariusbancila.ro\\\/blog\\\/2018\\\/03\\\/13\\\/using-curl-library-from-c-on-windows\\\/#webpage\"},\"articleSection\":\"C++, Visual Studio, Windows Programming, C++, cpp, curl, curlcpp, libcurl, VS2017, Windows\"},{\"@type\":\"BreadcrumbList\",\"@id\":\"https:\\\/\\\/mariusbancila.ro\\\/blog\\\/2018\\\/03\\\/13\\\/using-curl-library-from-c-on-windows\\\/#breadcrumblist\",\"itemListElement\":[{\"@type\":\"ListItem\",\"@id\":\"https:\\\/\\\/mariusbancila.ro\\\/blog#listItem\",\"position\":1,\"name\":\"Home\",\"item\":\"https:\\\/\\\/mariusbancila.ro\\\/blog\",\"nextItem\":{\"@type\":\"ListItem\",\"@id\":\"https:\\\/\\\/mariusbancila.ro\\\/blog\\\/category\\\/it\\\/#listItem\",\"name\":\"IT\"}},{\"@type\":\"ListItem\",\"@id\":\"https:\\\/\\\/mariusbancila.ro\\\/blog\\\/category\\\/it\\\/#listItem\",\"position\":2,\"name\":\"IT\",\"item\":\"https:\\\/\\\/mariusbancila.ro\\\/blog\\\/category\\\/it\\\/\",\"nextItem\":{\"@type\":\"ListItem\",\"@id\":\"https:\\\/\\\/mariusbancila.ro\\\/blog\\\/category\\\/it\\\/software\\\/#listItem\",\"name\":\"Software\"},\"previousItem\":{\"@type\":\"ListItem\",\"@id\":\"https:\\\/\\\/mariusbancila.ro\\\/blog#listItem\",\"name\":\"Home\"}},{\"@type\":\"ListItem\",\"@id\":\"https:\\\/\\\/mariusbancila.ro\\\/blog\\\/category\\\/it\\\/software\\\/#listItem\",\"position\":3,\"name\":\"Software\",\"item\":\"https:\\\/\\\/mariusbancila.ro\\\/blog\\\/category\\\/it\\\/software\\\/\",\"nextItem\":{\"@type\":\"ListItem\",\"@id\":\"https:\\\/\\\/mariusbancila.ro\\\/blog\\\/category\\\/it\\\/software\\\/c\\\/#listItem\",\"name\":\"C++\"},\"previousItem\":{\"@type\":\"ListItem\",\"@id\":\"https:\\\/\\\/mariusbancila.ro\\\/blog\\\/category\\\/it\\\/#listItem\",\"name\":\"IT\"}},{\"@type\":\"ListItem\",\"@id\":\"https:\\\/\\\/mariusbancila.ro\\\/blog\\\/category\\\/it\\\/software\\\/c\\\/#listItem\",\"position\":4,\"name\":\"C++\",\"item\":\"https:\\\/\\\/mariusbancila.ro\\\/blog\\\/category\\\/it\\\/software\\\/c\\\/\",\"nextItem\":{\"@type\":\"ListItem\",\"@id\":\"https:\\\/\\\/mariusbancila.ro\\\/blog\\\/2018\\\/03\\\/13\\\/using-curl-library-from-c-on-windows\\\/#listItem\",\"name\":\"Using the curl library from C++ on Windows\"},\"previousItem\":{\"@type\":\"ListItem\",\"@id\":\"https:\\\/\\\/mariusbancila.ro\\\/blog\\\/category\\\/it\\\/software\\\/#listItem\",\"name\":\"Software\"}},{\"@type\":\"ListItem\",\"@id\":\"https:\\\/\\\/mariusbancila.ro\\\/blog\\\/2018\\\/03\\\/13\\\/using-curl-library-from-c-on-windows\\\/#listItem\",\"position\":5,\"name\":\"Using the curl library from C++ on Windows\",\"previousItem\":{\"@type\":\"ListItem\",\"@id\":\"https:\\\/\\\/mariusbancila.ro\\\/blog\\\/category\\\/it\\\/software\\\/c\\\/#listItem\",\"name\":\"C++\"}}]},{\"@type\":\"Organization\",\"@id\":\"https:\\\/\\\/mariusbancila.ro\\\/blog\\\/#organization\",\"name\":\"Marius Bancila's Blog\",\"description\":\"About code. 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