Linker error with Curl Win32 C++ *Solved*

#1

Hi, I am trying to link Curl into my project in visual studio 2013 (C++).

I downloaded Curl from http://curl.haxx.se/download.html
(the brinary one). I know there is development, although they are older versions.
Not sure whether it matters which one I download. Can anyone clarify?

Win32 - Generic

Win32 zip     7.38.0     binary                 Dirk Paehl     
Win32 CAB     7.38.0     binary     SSL           Stefan Kanthak     422 KB
Win32 zip     7.38.0     binary     SSL     SSH     Dirk Paehl     
Win32 2000/XP zip     7.34.0     binary     SSL           Günter Knauf     2.02 MB
Win32 2000/XP zip     7.34.0     binary     SSL     SSH     Günter Knauf     2.40 MB
Win32 2000/XP zip     7.34.0     libcurl     SSL           Günter Knauf     3.34 MB
Win32 2000/XP MSI     7.38.0     binary     SSL     SSH     Edward LoPinto

I went for this one:

Win32 2000/XP zip     7.38.0     binary     SSL     SSH     Edward LoPinto
www.confusedbycode.com/curl/curl-7.38.0-win32.zip

I have added the include folder into visual studio:
D:\curl-7.38.0-win32\include\

And added the library folder into visual studio:
D:\curl-7.38.0-win32\lib\

Code:

//extract of code for include
#include <curl/curl.h>

//extract of code for CURL code
CURL *curl;
    CURLcode res;
    curl = curl_easy_init();
    if (curl)
    {
        curl_easy_setopt(curl, CURLOPT_URL, "www.myurl.com");
        curl_easy_setopt(curl, CURLOPT_WRITEFUNCTION, write_callback);

        res = curl_easy_perform(curl);

        curl_easy_cleanup(curl);
    }

//extract of code for callback function
static size_t write_callback(void *ptr, size_t size, size_t nmemb, void *data)
{
    //printf("xx");
}

I get these errors when I compile:

Error    5    error LNK2019: unresolved external symbol "public: static unsigned int __cdecl MenuScene::write_callback(void *,unsigned int,unsigned int,void *)" (?write_callback@MenuScene@@SAIPAXII0@Z) referenced in function "public: virtual bool __thiscall MenuScene::init(void)" (?init@MenuScene@@UAE_NXZ)    D:\Chris\Projects\abcd\proj.win32\MenuScene.obj    abcd

Error    6    error LNK1120: 1 unresolved externals    D:\Chris\Projects\abcd\proj.win32\Debug.win32\abcd.exe    1    1    abcd

Anyone know what I need to do to resolve the linker errors ?

#2

Ok, I solved my issue.

I had the function below inside a class accidentally.
Because it is static, it should be outside of a class.

//extract of code for callback function
static size_t write_callback(void *ptr, size_t size, size_t nmemb, void *data)
{
    //printf("xx");
}
#3

Hi @utilae, it seems I have a same sort of the problem with linker.

Can you like at it please: [SOLVED] MSVS 2010 linker error LNK2019 while using ui components (ui::ScrollView)

#4

You can solve this problem with typing libcurl_imp.lib in project properties->Configuration Properties->Linker->Input->Additional Dependencies