Question

How to install libcurl under Visual Studio 2008

Asked by: mbiwpeoyc

I'm a fairly new programmer as far c++ goes, and even newer to visual studio. I need to make an application that can go out and grab a URL and bring it down for me to parse and populate various controls in my application with data. Everywhere I've looked I've been pointed to libcurl. I've attempted to compile libcurl, include the libraries...just about everything under the sun. In the code section here, I've included the huge output of errors I get. If someone has a step-by-step how to, to get libcurl working in a c++ environment I would be happy to follow it. I've tried looking on the libcurl site and I can't seem to find a c++ way to do it.

Or if someone has an alternative way to grab a url I'm all ears.

The error output is from
curlpp::initialize();
curlpp::libcurlVersion();

1>test1.cpp
1>c:\libs\curl\include\curl/curl.h(1364) : warning C4272: 'curl_strequal' : is marked __declspec(dllimport); must specify native calling convention when importing a function.
1>c:\libs\curl\include\curl/curl.h(1365) : warning C4272: 'curl_strnequal' : is marked __declspec(dllimport); must specify native calling convention when importing a function.
1>c:\libs\curl\include\curl/curl.h(1458) : warning C4272: 'curl_formadd' : is marked __declspec(dllimport); must specify native calling convention when importing a function.
1>c:\libs\curl\include\curl/curl.h(1481) : warning C4272: 'curl_formget' : is marked __declspec(dllimport); must specify native calling convention when importing a function.
1>c:\libs\curl\include\curl/curl.h(1489) : warning C4272: 'curl_formfree' : is marked __declspec(dllimport); must specify native calling convention when importing a function.
1>c:\libs\curl\include\curl/curl.h(1499) : warning C4272: 'curl_getenv' : is marked __declspec(dllimport); must specify native calling convention when importing a function.
1>c:\libs\curl\include\curl/curl.h(1508) : warning C4272: 'curl_version' : is marked __declspec(dllimport); must specify native calling convention when importing a function.
1>c:\libs\curl\include\curl/curl.h(1521) : warning C4272: 'curl_easy_escape' : is marked __declspec(dllimport); must specify native calling convention when importing a function.
1>c:\libs\curl\include\curl/curl.h(1525) : warning C4272: 'curl_escape' : is marked __declspec(dllimport); must specify native calling convention when importing a function.
1>c:\libs\curl\include\curl/curl.h(1542) : warning C4272: 'curl_easy_unescape' : is marked __declspec(dllimport); must specify native calling convention when importing a function.
1>c:\libs\curl\include\curl/curl.h(1546) : warning C4272: 'curl_unescape' : is marked __declspec(dllimport); must specify native calling convention when importing a function.
1>c:\libs\curl\include\curl/curl.h(1556) : warning C4272: 'curl_free' : is marked __declspec(dllimport); must specify native calling convention when importing a function.
1>c:\libs\curl\include\curl/curl.h(1568) : warning C4272: 'curl_global_init' : is marked __declspec(dllimport); must specify native calling convention when importing a function.
1>c:\libs\curl\include\curl/curl.h(1588) : warning C4272: 'curl_global_init_mem' : is marked __declspec(dllimport); must specify native calling convention when importing a function.
1>c:\libs\curl\include\curl/curl.h(1598) : warning C4272: 'curl_global_cleanup' : is marked __declspec(dllimport); must specify native calling convention when importing a function.
1>c:\libs\curl\include\curl/curl.h(1615) : warning C4272: 'curl_slist_append' : is marked __declspec(dllimport); must specify native calling convention when importing a function.
1>c:\libs\curl\include\curl/curl.h(1624) : warning C4272: 'curl_slist_free_all' : is marked __declspec(dllimport); must specify native calling convention when importing a function.
1>c:\libs\curl\include\curl/curl.h(1635) : warning C4272: 'curl_getdate' : is marked __declspec(dllimport); must specify native calling convention when importing a function.
1>c:\libs\curl\include\curl/curl.h(1775) : warning C4272: 'curl_share_init' : is marked __declspec(dllimport); must specify native calling convention when importing a function.
1>c:\libs\curl\include\curl/curl.h(1776) : warning C4272: 'curl_share_setopt' : is marked __declspec(dllimport); must specify native calling convention when importing a function.
1>c:\libs\curl\include\curl/curl.h(1777) : warning C4272: 'curl_share_cleanup' : is marked __declspec(dllimport); must specify native calling convention when importing a function.
1>c:\libs\curl\include\curl/curl.h(1849) : warning C4272: 'curl_version_info' : is marked __declspec(dllimport); must specify native calling convention when importing a function.
1>c:\libs\curl\include\curl/curl.h(1860) : warning C4272: 'curl_easy_strerror' : is marked __declspec(dllimport); must specify native calling convention when importing a function.
1>c:\libs\curl\include\curl/curl.h(1871) : warning C4272: 'curl_share_strerror' : is marked __declspec(dllimport); must specify native calling convention when importing a function.
1>c:\libs\curl\include\curl/curl.h(1882) : warning C4272: 'curl_easy_pause' : is marked __declspec(dllimport); must specify native calling convention when importing a function.
1>c:\libs\curl\include\curl\easy.h(29) : warning C4272: 'curl_easy_init' : is marked __declspec(dllimport); must specify native calling convention when importing a function.
1>c:\libs\curl\include\curl\easy.h(30) : warning C4272: 'curl_easy_setopt' : is marked __declspec(dllimport); must specify native calling convention when importing a function.
1>c:\libs\curl\include\curl\easy.h(31) : warning C4272: 'curl_easy_perform' : is marked __declspec(dllimport); must specify native calling convention when importing a function.
1>c:\libs\curl\include\curl\easy.h(32) : warning C4272: 'curl_easy_cleanup' : is marked __declspec(dllimport); must specify native calling convention when importing a function.
1>c:\libs\curl\include\curl\easy.h(47) : warning C4272: 'curl_easy_getinfo' : is marked __declspec(dllimport); must specify native calling convention when importing a function.
1>c:\libs\curl\include\curl\easy.h(62) : warning C4272: 'curl_easy_duphandle' : is marked __declspec(dllimport); must specify native calling convention when importing a function.
1>c:\libs\curl\include\curl\easy.h(75) : warning C4272: 'curl_easy_reset' : is marked __declspec(dllimport); must specify native calling convention when importing a function.
1>c:\libs\curl\include\curl\easy.h(86) : warning C4272: 'curl_easy_recv' : is marked __declspec(dllimport); must specify native calling convention when importing a function.
1>c:\libs\curl\include\curl\easy.h(97) : warning C4272: 'curl_easy_send' : is marked __declspec(dllimport); must specify native calling convention when importing a function.
1>c:\libs\curl\include\curl\multi.h(100) : warning C4272: 'curl_multi_init' : is marked __declspec(dllimport); must specify native calling convention when importing a function.
1>c:\libs\curl\include\curl\multi.h(110) : warning C4272: 'curl_multi_add_handle' : is marked __declspec(dllimport); must specify native calling convention when importing a function.
1>c:\libs\curl\include\curl\multi.h(120) : warning C4272: 'curl_multi_remove_handle' : is marked __declspec(dllimport); must specify native calling convention when importing a function.
1>c:\libs\curl\include\curl\multi.h(135) : warning C4272: 'curl_multi_fdset' : is marked __declspec(dllimport); must specify native calling convention when importing a function.
1>c:\libs\curl\include\curl\multi.h(154) : warning C4272: 'curl_multi_perform' : is marked __declspec(dllimport); must specify native calling convention when importing a function.
1>c:\libs\curl\include\curl\multi.h(166) : warning C4272: 'curl_multi_cleanup' : is marked __declspec(dllimport); must specify native calling convention when importing a function.
1>c:\libs\curl\include\curl\multi.h(197) : warning C4272: 'curl_multi_info_read' : is marked __declspec(dllimport); must specify native calling convention when importing a function.
1>c:\libs\curl\include\curl\multi.h(208) : warning C4272: 'curl_multi_strerror' : is marked __declspec(dllimport); must specify native calling convention when importing a function.
1>c:\libs\curl\include\curl\multi.h(254) : warning C4272: 'curl_multi_socket' : is marked __declspec(dllimport); must specify native calling convention when importing a function.
1>c:\libs\curl\include\curl\multi.h(259) : warning C4272: 'curl_multi_socket_action' : is marked __declspec(dllimport); must specify native calling convention when importing a function.
1>c:\libs\curl\include\curl\multi.h(262) : warning C4272: 'curl_multi_socket_all' : is marked __declspec(dllimport); must specify native calling convention when importing a function.
1>c:\libs\curl\include\curl\multi.h(281) : warning C4272: 'curl_multi_timeout' : is marked __declspec(dllimport); must specify native calling convention when importing a function.
1>c:\libs\curl\include\curl\multi.h(327) : warning C4272: 'curl_multi_setopt' : is marked __declspec(dllimport); must specify native calling convention when importing a function.
1>c:\libs\curl\include\curl\multi.h(340) : warning C4272: 'curl_multi_assign' : is marked __declspec(dllimport); must specify native calling convention when importing a function.
1>c:\libs\curlpp\include\curlpp\curlpp.hpp(68) : warning C4272: 'curlpp::initialize' : is marked __declspec(dllimport); must specify native calling convention when importing a function.
1>c:\libs\curlpp\include\curlpp\curlpp.hpp(78) : warning C4272: 'curlpp::terminate' : is marked __declspec(dllimport); must specify native calling convention when importing a function.
1>c:\libs\curlpp\include\curlpp\curlpp.hpp(106) : warning C4272: 'curlpp::Cleanup::Cleanup' : is marked __declspec(dllimport); must specify native calling convention when importing a function.
1>c:\libs\curlpp\include\curlpp\curlpp.hpp(107) : warning C4272: 'curlpp::Cleanup::~Cleanup' : is marked __declspec(dllimport); must specify native calling convention when importing a function.
1>c:\libs\curlpp\include\curlpp\curlpp.hpp(109) : warning C4272: 'curlpp::Cleanup::Cleanup' : is marked __declspec(dllimport); must specify native calling convention when importing a function.
1>c:\libs\curlpp\include\curlpp\curlpp.hpp(109) : warning C4272: 'curlpp::Cleanup::operator =' : is marked __declspec(dllimport); must specify native calling convention when importing a function.
1>c:\libs\curlpp\include\curlpp\curlpp.hpp(120) : warning C4272: 'curlpp::escape' : is marked __declspec(dllimport); must specify native calling convention when importing a function.
1>c:\libs\curlpp\include\curlpp\curlpp.hpp(133) : warning C4272: 'curlpp::unescape' : is marked __declspec(dllimport); must specify native calling convention when importing a function.
1>c:\libs\curlpp\include\curlpp\curlpp.hpp(147) : warning C4272: 'curlpp::getenv' : is marked __declspec(dllimport); must specify native calling convention when importing a function.
1>c:\libs\curlpp\include\curlpp\curlpp.hpp(157) : warning C4272: 'curlpp::libcurlVersion' : is marked __declspec(dllimport); must specify native calling convention when importing a function.
1>c:\libs\curlpp\include\curlpp\curlpp.hpp(216) : warning C4272: 'curlpp::getdate' : is marked __declspec(dllimport); must specify native calling convention when importing a function.
1>Linking...
1>test1.obj : error LNK2028: unresolved token (0A000015) "class std::basic_string<char,struct std::char_traits<char>,class std::allocator<char> > __clrcall curlpp::libcurlVersion(void)" (?libcurlVersion@curlpp@@$$FYM?AV?$basic_string@DU?$char_traits@D@std@@V?$allocator@D@2@@std@@XZ) referenced in function "private: void __clrcall test1::Form1::Form1_Load(class System::Object ^,class System::EventArgs ^)" (?Form1_Load@Form1@test1@@$$FA$AAMXP$AAVObject@System@@P$AAVEventArgs@4@@Z)
1>test1.obj : error LNK2028: unresolved token (0A000016) "void __clrcall curlpp::initialize(long)" (?initialize@curlpp@@$$FYMXJ@Z) referenced in function "private: void __clrcall test1::Form1::Form1_Load(class System::Object ^,class System::EventArgs ^)" (?Form1_Load@Form1@test1@@$$FA$AAMXP$AAVObject@System@@P$AAVEventArgs@4@@Z)
1>test1.obj : error LNK2019: unresolved external symbol "class std::basic_string<char,struct std::char_traits<char>,class std::allocator<char> > __clrcall curlpp::libcurlVersion(void)" (?libcurlVersion@curlpp@@$$FYM?AV?$basic_string@DU?$char_traits@D@std@@V?$allocator@D@2@@std@@XZ) referenced in function "private: void __clrcall test1::Form1::Form1_Load(class System::Object ^,class System::EventArgs ^)" (?Form1_Load@Form1@test1@@$$FA$AAMXP$AAVObject@System@@P$AAVEventArgs@4@@Z)
1>test1.obj : error LNK2019: unresolved external symbol "void __clrcall curlpp::initialize(long)" (?initialize@curlpp@@$$FYMXJ@Z) referenced in function "private: void __clrcall test1::Form1::Form1_Load(class System::Object ^,class System::EventArgs ^)" (?Form1_Load@Form1@test1@@$$FA$AAMXP$AAVObject@System@@P$AAVEventArgs@4@@Z)
1>c:\Projects\test1\Debug\test1.exe : fatal error LNK1120: 4 unresolved externals

                                  
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Asked On
2009-10-12 at 04:10:49ID24804132
Tags

c++

,

vc++

,

libcurl

Topics

C++ Programming Language

,

Microsoft Visual C++.Net

Participating Experts
3
Points
500
Comments
8

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Answers

 

by: AndyAinscowPosted on 2009-10-12 at 04:25:37ID: 25550201

From your output
Form1_Load(class System::Object ^,class System::EventArgs ^)


I think you would have rather more success if you coded in C++ rather than C++.NET language - they aren't the same.

 

by: mbiwpeoycPosted on 2009-10-12 at 04:43:58ID: 25550288

If that was an option where I work I would be all over that. Unfortunately, this is what I was given to use.
I don't understand your solution. Are you saying the "private: " is what's killing it?

 

by: AndyAinscowPosted on 2009-10-12 at 07:58:41ID: 25551790

Firstly - You are attempting to use an unmanaged C++ code inside a managed (.NET) application.  They are not the same programming language (despite superficial similarities).  The 'private' keyword has nothing to do with your problem.

>>Unfortunately, this is what I was given to use.

Oh dear.  :-(   Someone wants to make your life difficult.

I don't know how flexible your 'work giver' is.  The following are some options available:
1) Code the interface in C++ (eg. with MFC - microsoft prebuilt classes to help windows programming) and use the libcurl with that.
2) Write an unmanaged dll that wraps the libcurl and call that from your managed code.
3) Find a .NET equivalent of libcurl and use that directly with a WinForms application.
4) Immerse yourself in mixed mode programming and use thebits of libcurl you require as unmanaged code inside your managed app.
5) Convert the sections of libcurl you require from C++ into C++.NET and use that directly with a WinForms application.

 

by: evilrixPosted on 2009-10-12 at 09:53:33ID: 25552819

>> Firstly - You are attempting to use an unmanaged C++ code inside a managed (.NET) application
It is my understanding that IJW (It Just works) means you can seamlessly integrate managed and unmanaged C++ code in a mixed mode managed C++ project.

You can write an unmanaged wrapper (that is still part of the managed project) to access the unmanaged code.

http://www.codeproject.com/KB/mcpp/nishijw01.aspx
http://ondotnet.com/pub/a/dotnet/2004/03/29/mcpp_part3.html

// C++
 
#include <iostream>
 
namespace UnmanagedCode
{
        void foo()
        {
                std::cout << "Hello, world" << std::endl;
        }
}
 
namespace ManagedCode
{
        public ref class fooWrapper
        {
        public:
                static void foo()
                {
                        UnmanagedCode::foo();
                }
        };
}
 
 
// C# code
 
using System;
using System.Collections.Generic;
using System.Text;
 
namespace scratchcs
{
    class Program
    {
        static void Main(string[] args)
        {
            ManagedCode.fooWrapper.foo();
        }
    }
}
                                              
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by: AndyAinscowPosted on 2009-10-12 at 09:58:18ID: 25552845

>>Unfortunately, this is what I was given to use.

I've had a thought - exactly what has been specified ?  Are you attempting to use C++ and by mistake started a C++.NET project instead of plain C++ ?
If that is the case then when you create a new project look carefully at what you select - it should not be a .NET based application.

 

by: itsmeandnobodyelsePosted on 2009-10-13 at 06:52:04ID: 25559894

>>>> It is my understanding that IJW (It Just works) means you can seamlessly integrate managed and unmanaged C++ code in a mixed mode managed C++ project.

"You can" isn't the same as "you should".

Unfortunately you would need knowledge both for managed C++ and unmanaged C++ what isn't the case by most experts here (e. g. I have only a rudimentary knowledge of managed C++) let aside by beginners. If you firstly heard about those differences, you better let hands-off building a mixed-language assembly.

 

by: itsmeandnobodyelsePosted on 2009-10-13 at 07:03:56ID: 25560033

>>>> If someone has a step-by-step how to, to get libcurl working in a c++ environment I would be happy to follow it.
If you would turn your C++.NET project to a Win32 or MFC project as Andy has suggested you could follow the instructions given in the following link:

     http://blog.expandrive.com/2007/07/27/libcurl-on-windows-with-visual-studio-2005/

If you are stuck on managed C++ using Windows Forms, you better use .NET services instead of libcurl. Though my knowledge of C++.NET is little to nothing, I know that the main purpose of C++.NET is to provide and use web-based services. So, it rarely is a problem to substitute each libcurl function by an equivalent .NET function.

 

by: mbiwpeoycPosted on 2009-10-13 at 18:36:33ID: 31639988

Excellent all around, you guys actually got me on the right path to getting around my managed .NET problem thank you!

20120131-EE-VQP-002

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