What can I solve the problem "error LNK2019: unresolved external symbol"

Question

I'm trying to compile the raptor parser at windows.

I can't solve the Linking error.

Plz.. help me.

The error message like that.

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   Creating library .\Debug/raptor.lib and object .\Debug/raptor.exp
3>raptor_rss.obj : error LNK2019: unresolved external symbol _strcasecmp referenced in function _raptor_rss_start_element_handler
3>raptor_www.obj : error LNK2019: unresolved external symbol __imp__curl_global_init referenced in function _raptor_www_init
3>raptor_www.obj : error LNK2019: unresolved external symbol __imp__curl_global_cleanup referenced in function _raptor_www_finish
3>raptor_www_curl.obj : error LNK2019: unresolved external symbol __imp__curl_easy_setopt referenced in function _raptor_www_curl_init
3>raptor_www_curl.obj : error LNK2019: unresolved external symbol __imp__curl_easy_init referenced in function _raptor_www_curl_init
3>raptor_www_curl.obj : error LNK2019: unresolved external symbol __imp__curl_easy_cleanup referenced in function _raptor_www_curl_free
3>raptor_www_curl.obj : error LNK2019: unresolved external symbol __imp__curl_slist_free_all referenced in function _raptor_www_curl_fetch
3>raptor_www_curl.obj : error LNK2019: unresolved external symbol __imp__curl_easy_getinfo referenced in function _raptor_www_curl_fetch
3>raptor_www_curl.obj : error LNK2019: unresolved external symbol __imp__curl_easy_perform referenced in function _raptor_www_curl_fetch
3>raptor_www_curl.obj : error LNK2019: unresolved external symbol __imp__curl_slist_append referenced in function _raptor_www_curl_fetch
3>.\Debug/raptor.dll : fatal error LNK1120: 10 unresolved externals

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I'm waiting your answer.

Answer 1

Hi Ms luckforyou.

It's really hard to assume limker error without code.

I guess you should make sure that each functions are existed in some library.

 

Please reference this msdn page,

http://msdn2.microsoft.com/en-us/library/799kze2z(vs.71).aspx

Answer 2

 Thanks for your answer.

I solved problem related "curllib", but there are two problems.

I just think it relate "string.h" but it aleady include the head file.

If you have any idea, plz comment me.

 

________________________________________________________________________________________________

2>raptor_rss.obj : error LNK2019: unresolved external symbol _strcasecmp referenced in function _raptor_rss_start_element_handler
2>.\Debug/raptor.dll : fatal error LNK1120: 1 unresolved externals

_________________________________________________________________________________________________

Have a nice day! 

 

Answer 3

I have solved the above link error's by using below settings.

 

Project properties -> all releases -> configuration properties -> linker -> input -> and set
additional dependencies   to   =    libcurl.lib ws2_32.lib winmm.lib wldap32.lib

 

Add new macros at the preprocessors  = ;BUILDING_LIBCURL;HTTP_ONLY

 

Pls let me know if you could not able to resolved the link issues

Answer 4

>Pls let me know if you could not able to
>resolved the link issues

Additional info added to an existing thread
is sometimes helpful. But just in case you
hadn't noticed, you have responded to a
thread which is almost three years old.
I expect the original poster has moved on
to other issues by now. Of course, others
encountering the same problem may benefit
from your solution.

- Wayne

Answer 5

http://curl.haxx.se/libcurl/c/Using-libcurl-with-SSH-support-in-Visual-Studio-2008.pdf

 

 

Most useful link for curl users in windows.. 

Answer 6

i had the same problem, at last i find that i haven't link the .lib file, so use the "#pragma comment(lib, "libcurl_imp.lib") is ok.

note: my curl library file name is libcurl_imp.lib, use your corresponding file name is ok.

Answer 7

HI ...

I had done the changes what you mentioned.
but still, I'm getting them

Error LNK2019 unresolved external symbol curl_easy_init referenced in function down_acp_tests