Linker Error Lnk2019
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Error Lnk2019 Unresolved External Symbol C++
Channel 9 Documentation APIs and reference Dev centers Samples Retired content error lnk1120 We’re sorry. The content you requested has been removed. You’ll be auto redirected in 1 second. C/C++ error lnk2019 unresolved external symbol referenced in function Building Reference C/C++ Build Errors Linker Tools Errors and Warnings Linker Tools Errors and Warnings Linker Tools Error LNK2019 Linker Tools Error LNK2019 Linker Tools Error LNK2019 Linker
Fatal Error Lnk1120
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Error Lnk2019 Unresolved External Symbol __declspec(dllimport)
Tools Error LNK1152 Linker Tools Error LNK1158 Linker Tools Error LNK1164 Linker Tools Error LNK1166 Linker Tools Error LNK1168 Linker Tools Error LNK1169 Linker Tools Error LNK1179 Linker Tools Error LNK1181 Linker Tools Error LNK1188 Linker Tools Error LNK1189 Linker Tools Error LNK1196 Linker Tools Error LNK1200 Linker Tools Error LNK1201 Linker Tools Error LNK1211 Linker Tools Error LNK1215 Linker Tools Error LNK1218 Linker Tools Error LNK1221 Linker Tools Error LNK1223 Linker Tools Error LNK1224 Linker Tools Error LNK1237 Linker Tools Error LNK1240 Linker Tools Error LNK1241 Linker Tools Error LNK1245 Linker Tools Error LNK1248 Linker Tools Error LNK1256 Linker Tools Error LNK1264 Linker Tools Error LNK1277 Linker Tools Error LNK1282 Linker Tools Error LNK1287 Linker Tools Error LNK1296 Linker Tools Error LNK1301 Linker Tools Error LNK1302 Linker Tools Error LNK1306 Linker Tools Error LNK1309 Linker Tools Error LNK1312 Linker Tools Error LNK1313 Linker Tools Error LNK1314 Linker Tools Error LNK1332 Linker Tools Error LNK1561 Linker Tools Error LNK2001 Linker Tools Error LNK2004 Linker Tools Error
here for a quick overview of the site Help Center Detailed answers to any questions you might have Meta Discuss the workings and policies of this site error lnk2019: unresolved external symbol "public: __thiscall About Us Learn more about Stack Overflow the company Business Learn more about
Error Lnk1120 1 Unresolved Externals
hiring developers or posting ads with us Stack Overflow Questions Jobs Documentation Tags Users Badges Ask Question x Dismiss error lnk2019 unresolved external symbol winmain@16 referenced in function ___tmaincrtstartup Join the Stack Overflow Community Stack Overflow is a community of 6.2 million programmers, just like you, helping each other. Join them; it only takes a minute: Sign up How to solve error https://msdn.microsoft.com/en-us/library/799kze2z.aspx LNK2019 up vote 5 down vote favorite 3 I am sending a simple email in C++. I downloaded a sample C++ program from the below link. http://cboard.cprogramming.com/cplusplus-programming/125655-sending-simple-email-cplusplus.html The sample program seems to hit the following error when it is compiling. Please help me with solution. Error 8 error LNK2019: unresolved external symbol _send_mail referenced in function _wmain Error 9 error LNK2019: unresolved external symbol __imp__recv@16 http://stackoverflow.com/questions/14890847/how-to-solve-error-lnk2019 referenced in function "int __cdecl connect_to_server(char const *)" (?connect_to_server@@YAHPBD@Z) Error 10 error LNK2019: unresolved external symbol __imp__connect@12 referenced in function "int __cdecl connect_to_server(char const *)" (?connect_to_server@@YAHPBD@Z) Error 11 error LNK2019: unresolved external symbol __imp__htons@4 referenced in function "int __cdecl connect_to_server(char const *)" (?connect_to_server@@YAHPBD@Z) Error 12 error LNK2019: unresolved external symbol __imp__socket@12 referenced in function "int __cdecl connect_to_server(char const *)" (?connect_to_server@@YAHPBD@Z) Error 13 error LNK2019: unresolved external symbol __imp__getprotobyname@4 referenced in function "int __cdecl connect_to_server(char const *)" (?connect_to_server@@YAHPBD@Z) Error 14 error LNK2019: unresolved external symbol __imp__gethostbyname@4 referenced in function "int __cdecl connect_to_server(char const *)" (?connect_to_server@@YAHPBD@Z) c++ linker unresolved-external lnk2019 share|improve this question edited Feb 15 '13 at 8:41 Andreas Fester 24.5k44784 asked Feb 15 '13 at 8:39 user1 1525720 You seem to be missing a source file or a library. –Joachim Pileborg Feb 15 '13 at 8:40 Pretty sure you haven't compiled the source or linked against it. –Peter Wood Feb 15 '13 at 8:51 add a comment| 8 Answers 8 active oldest votes up vote 6 down vote Probably you have declared the function in a class, but forgotten to use the scope resolution operator in its definition.
here for a quick overview of the site Help Center Detailed answers to any questions you might have Meta Discuss the workings and policies of this site About Us Learn more http://stackoverflow.com/questions/12573816/what-is-an-undefined-reference-unresolved-external-symbol-error-and-how-do-i-fix about Stack Overflow the company Business Learn more about hiring developers or posting ads http://stackoverflow.com/questions/15090418/how-do-i-link-a-dll-to-my-project-error-lnk2019-unresolved-external-symbol with us Stack Overflow Questions Jobs Documentation Tags Users Badges Ask Question x Dismiss Join the Stack Overflow Community Stack Overflow is a community of 6.2 million programmers, just like you, helping each other. Join them; it only takes a minute: Sign up What is an undefined reference/unresolved external symbol error and how do I fix error lnk2019 it? up vote 712 down vote favorite 317 What are undefined reference/unresolved external symbol errors? What are common causes and how to fix/prevent them? Feel free to edit/add your own. c++ linker-error undefined-reference c++-faq unresolved-external share|improve this question edited Aug 4 '14 at 13:33 Arno Duvenhage 805517 asked Sep 24 '12 at 22:27 Luchian Grigore 167k28295455 3 One thing to consider adding is how to deal with "undefined unresolved external symbol vtable" and "undefined typeinfo" errors in particular (since they are less obvious than undefined functions or variables). –Jeremiah Willcock Jul 16 '13 at 18:25 1 I've been marking this question to be a possible dupe of this one. But after going through all of your (brilliant) answers, I can't see this case covered here. I'm aware it's specific about how an IDE sets up the project type and it's linkage dependencies. But that's a such frequently asked question I think it would be worth covered (maybe just with a link to another appropriate dupe) here. If it is already, and I just didn't spot it, forget about this request/comment. –πάντα ῥεῖ Mar 3 '14 at 21:14 @LuchianGrigore 'feel free to add an answer' I preferred to add the relevant link (IMHO) your primary answer, if you'd like to permit. –πάντα ῥεῖ Mar 3 '14 at 22:36 1 Pretty common mistake is that you define a function as a standalone and forget the class selector (e.g. A::) in your .cpp file: You do this (wrong): void myFunc() { /* do stuff */ } Instead of this (right): void A::myFunc() { /* do stuff */ } –jave.web Mar 11 '15 at 18:45 4 I
here for a quick overview of the site Help Center Detailed answers to any questions you might have Meta Discuss the workings and policies of this site About Us Learn more about Stack Overflow the company Business Learn more about hiring developers or posting ads with us Stack Overflow Questions Jobs Documentation Tags Users Badges Ask Question x Dismiss Join the Stack Overflow Community Stack Overflow is a community of 6.2 million programmers, just like you, helping each other. Join them; it only takes a minute: Sign up How do I link a DLL to my project? error LNK2019: unresolved external symbol up vote 5 down vote favorite 2 I have a file foo.h that has various declarations for functions. All of these functions are implemented in a file foo.dll. However, when I include the .h file and try to use any of the functions, I get the error: bar.obj : error LNK2019: unresolved external symbol SomeFunction so obviously the function implementations aren't being found. What do I have to do to help the compiler find the definitions in the DLL and associate them with the .h file? I've seen some stuff about __declspec(dllexport) and __declspec(dllimport) but I still can't figure out how to use them. c++ windows function dll linker share|improve this question edited Mar 1 '13 at 16:30 asked Feb 26 '13 at 13:33 xcdemon05 56231231 Are you linking your executable with the import library of foo.dll (usually named foo.lib)? –Frédéric Hamidi Feb 26 '13 at 13:34 I'm new to this so I'm not really sure how that's done. Is that in visual studio's properties for the project? –xcdemon05 Feb 26 '13 at 13:35 1 @xcdemon05, yes, among the linker options there. –Frédéric Hamidi Feb 26 '13 at 13:37 add a comment| 3 Answers 3 active oldest votes up vote 6 down vote accepted You should have received at least three files from the DLL owner. The DLL which you'll need at runtime, the .h file with the declarations of the exported functions, you already have that. And a .lib file, the import library for the DLL. Which the linker requires so it knows how to add the functions to the program's import table. You are missing the step where you told the linker that it needs to link the .lib file. It needs to be added to the linker's Input + Additional Dependencies setting of your project. Or most easily done by writing the linker instruction in your source code: #include "foo.h" #pragma comment(lib, "foo.lib") Which works for MSVC, not otherwise portable but linking never is. Copy