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我遇到了几个error LNK2019: unresolved external symbol错误，但它们不是由于dlls、libs 或 OO 错误，就像其他关于此链接错误的 StackOverflow 帖子一样。

代码：

https://github.com/mcandre/fgdump/tree/master/cachedump

痕迹：

1>------ Build started: Project: cachedump, Configuration: Release Win32 ------
1>LINK : warning LNK4075: ignoring '/INCREMENTAL' due to '/OPT:ICF' specification
1>cachedump.obj : error LNK2019: unresolved external symbol "void __cdecl rc4_crypt(struct rc4_state *,unsigned char *,int)" (?rc4_crypt@@YAXPAUrc4_state@@PAEH@Z) referenced in function "unsigned long __cdecl DumpCache(void)" (?DumpCache@@YAKXZ)
1>cachedump.obj : error LNK2019: unresolved external symbol "void __cdecl rc4_setup(struct rc4_state *,unsigned char *,int)" (?rc4_setup@@YAXPAUrc4_state@@PAEH@Z) referenced in function "unsigned long __cdecl DumpCache(void)" (?DumpCache@@YAKXZ)
1>cachedump.obj : error LNK2019: unresolved external symbol "void __cdecl md5_finish(struct md5_context *,unsigned char * const)" (?md5_finish@@YAXPAUmd5_context@@QAE@Z) referenced in function "unsigned long __cdecl DumpCache(void)" (?DumpCache@@YAKXZ)
1>cachedump.obj : error LNK2019: unresolved external symbol "void __cdecl md5_update(struct md5_context *,unsigned char *,unsigned long)" (?md5_update@@YAXPAUmd5_context@@PAEK@Z) referenced in function "unsigned long __cdecl DumpCache(void)" (?DumpCache@@YAKXZ)
1>cachedump.obj : error LNK2019: unresolved external symbol "void __cdecl md5_starts(struct md5_context *)" (?md5_starts@@YAXPAUmd5_context@@@Z) referenced in function "unsigned long __cdecl DumpCache(void)" (?DumpCache@@YAKXZ)
1>C:\Users\andrew\Desktop\src\fgdump\cachedump\Release\cachedump.exe : fatal error LNK1120: 5 unresolved externals
========== Build: 0 succeeded, 1 failed, 0 up-to-date, 0 skipped ==========

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1 回答 1

1

.c文件被编译cl为C代码，而.cpp文件被编译为C++代码。由于符号定义C和C++代码中的不同，您的C++代码无法从C代码中看到函数。

在标题中使用extern "C"包装器，或者更好地为整个项目使用相同的语言

要制作extern "C"包装器，请使用以下模板

#ifdef __cplusplus
extern "C"
{
#endif

//put C-function declarations here    

#ifdef __cplusplus
}
#endif
于 2012-01-14T19:59:09.093 回答