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我需要编写 C++ 代码来下载网页，我知道我需要 curl，我使用的是 Mac osx，所以我在 /usr/include/curl 中有 libcurl。当我编译这段代码时，我得到了这个错误：

#include <stdio.h>
#include <curl/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;
}

这是错误：

  "/usr/bin/make" -f nbproject/Makefile-Debug.mk QMAKE= SUBPROJECTS= .clean-conf
   rm -f -r build/Debug
    rm -f dist/Debug/GNU-MacOSX/cppapplication

  CLEAN SUCCESSFUL (total time: 54ms)
  Undefined symbols for architecture x86_64: 
  "_curl_easy_cleanup", referenced from:    _main in main.o
  "_curl_easy_init", referenced from:       _main in main.o
  "_curl_easy_perform", referenced from:    _main in main.o
  "_curl_easy_setopt", referenced from:      _main in main.o
  "_curl_global_cleanup", referenced from:      _main in main.o
  "_curl_global_init", referenced from:      _main in main.o
  ld: symbol(s) not found for architecture x86_64
  collect2: ld returned 1 exit status
  make[2]: *** [dist/Debug/GNU-MacOSX/cppapplication] Error 1
  make[1]: *** [.build-conf] Error 2
  make: *** [.build-impl] Error 2
  BUILD FAILED (exit value 2, total time: 264ms)
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2 回答 2

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您应该curl在项目设置中添加库：项目属性 - 构建 - 链接器。似乎您添加了头文件的路径，但您还需要添加一个库，该库将在编译阶段后链接。

于 2013-07-10T22:46:07.093 回答
1

补充@sasha.sochka 的回答

项目构建属性的屏幕截图

于 2015-10-21T06:20:26.363 回答