错误LNK2019：未解析的外部符号libcurl Visual studio [英] error LNK2019: unresolved external symbol libcurl Visual studio

问题描述

我要打扫我的大脑，因为我一直试图解决这一整天。
是的，我知道这是一个链接器错误libcurl.lib我假设？
我尝试从不同的源下载libcurl并将其放在不同的地方。

这些是错误：

  LibFuckingCurl.obj：error LNK2019：未解析的外部符号__imp__curl_easy_strerror在函数_main中引用
  

和另外4个相同类型。

这是示例代码

  #include< stdio.h> 
 #include< curl.h> 
 
 int main（void）
 {
 CURL * curl; 
 CURLcode res; 
 
 curl = curl_easy_init（）; 
 if（curl）{
 curl_easy_setopt（curl，CURLOPT_URL，http://example.com）; 
 / * example.com被重定向，所以我们告诉libcurl跟随重定向* / 
 curl_easy_setopt（curl，CURLOPT_FOLLOWLOCATION，1L）; 
 
 / *执行请求，res将获得返回码* / 
 res = curl_easy_perform（curl）; 
 / *检查错误* / 
 if（res！= CURLE_OK）
 fprintf（stderr，curl_easy_perform（）failed：％s\\\
，
 curl_easy_strerror ））; 
 
 / * always cleanup * / 
 curl_easy_cleanup（curl）; 
} 
 return 0; 
} 
  

项目的属性
C / C ++
一般 - >其他包括目录 - > C：/ Project / libcurl / include

链接器
通用 - >附加库目录 - > C：/ Project / libcurl / lib

输入 - >附加依赖关系 - > libcurl.lib

命令行：这里我可以读libcurl.lib

 假设这个结构：
 Project 
 lib 
 libcurl.dll 
 libcurl.lib 
 ... dll的
包括
 curl.h 
 curlbuild.h 
 ...所有头文件
 VisualStudio（其中VS放置项目）
  

我也试过将include包括在目录和库路径的VC ++选项中。我已经阅读了许多指南，帖子，有相同问题，忘记包含libcurl.lib

我已下载的libcurl的预建版本之一，因为CMake几乎

任何帮助解决这个问题，我会奖励你命名我的第一个孩子后你。

解决方案

使用静态库在Visual Studio 2013上工作

我得到它的工作，由于一些天使。
找到这个git仓库： https://github.com/blackrosezy/build-libcurl-

如何：

运行包含在存储库中的.bat。

libcurl将在包含文件夹include和lib的第三方子文件夹中找到。

创建新的Visual Studio项目

属性 - > VC ++ - >添加目录thirdparty / include（路径）

属性 - > VC ++ - >添加库thirdparty / p>

属性 - > C ++ - >预处理器 - >添加CURL_STATICLIB

链接器 - >常规 - >附加库目录库 - > thirdparty / lib / static-debug（路径）
链接器 - >输入add：C：\xxx\xxx\xxx\build-libcurl-windows \ third-party\libcurl\ lib \static-debug\libcurl_a_debug.lib（lib文件的完整路径）

I'm about to blow my brains out since I've been trying to fix this all day. Yes, I am aware that this is a linker error to the libcurl.lib I assume? I've tried downloading libcurl from a different source and put it in different places.

These are the errors:

LibFuckingCurl.obj : error LNK2019: unresolved external symbol __imp__curl_easy_strerror referenced in function _main

and 4 more of the same kind.

This is the sample code

#include <stdio.h>
#include <curl.h>

int main(void)
{
    CURL *curl;
    CURLcode res;

    curl = curl_easy_init();
    if (curl) {
        curl_easy_setopt(curl, CURLOPT_URL, "http://example.com");
        /* example.com is redirected, so we tell libcurl to follow redirection */
        curl_easy_setopt(curl, CURLOPT_FOLLOWLOCATION, 1L);

        /* Perform the request, res will get the return code */
        res = curl_easy_perform(curl);
        /* Check for errors */
        if (res != CURLE_OK)
            fprintf(stderr, "curl_easy_perform() failed: %s\n",
            curl_easy_strerror(res));

        /* always cleanup */
        curl_easy_cleanup(curl);
    }
    return 0;
}

Properties for project C/C++ General -> Additional Include Directories -> C:/Project/libcurl/include

Linker General ->Additional Library Directories -> C:/Project/libcurl/lib

Input -> Additional Dependencies -> libcurl.lib

Commandline: Here I can read that libcurl.lib is stated

Assuming this structure:
Project
    lib
        libcurl.dll
        libcurl.lib
       ... dll's
    include
       curl.h
       curlbuild.h
            ... all the header files
    VisualStudio (where VS puts the project)

I also tried putting the includes in the VC++ option for directory and library path. I've read numerous guides, posts, people who had the same problem and forgot to include the libcurl.lib

I downloaded one of the prebuilt versions of libcurl because CMake almost killed me yesterday.

Any help to solve this and I will reward you with naming my firstborn child after you. Best regards

解决方案

Working on Visual Studio 2013 using Static Library

I got it to work now, thanks to some angel. Found this git repo: https://github.com/blackrosezy/build-libcurl-windows

Ran the .bat which also generated static libraries like the downloads before didnt.

How to:

Run the .bat included in the repository.

libcurl will be found in the thirdparty subfolder containing folders include and lib.

Create a new Visual Studio Project

Properties -> VC++ -> Add Directory thirdparty/include (the path)

Properties -> VC++ -> Add Library thirdparty/lib/static-debug (the path)

Properties -> C++ -> Preprocessor -> Add CURL_STATICLIB

Linker -> General -> Additional Library Directories Library -> thirdparty/lib/static-debug (the path) Linker -> Input add: C:\xxx\xxx\xxx\build-libcurl-windows\third-party\libcurl\lib\static-debug\libcurl_a_debug.lib (the full path of the lib file)

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