我很擅长使用libcurl静态版本编译DLL。我将以下三个函数作为未解析的外部函数:
1>curl.obj : error LNK2001: unresolved external symbol _curl_easy_init@0
1>curl.obj : error LNK2001: unresolved external symbol _curl_easy_perform@4
1>curl.obj : error LNK2001: unresolved external symbol _curl_easy_cleanup@4
以下是链接器操作的剪辑:
1>Searching libraries
1> Searching D:\develop\rm-asset\c-code\libs\libcurl.lib:
1> Found _curl_easy_setopt
1> Referenced in curl.obj
1> Loaded libcurl.lib(easy.obj)
1> Found _curl_slist_free_all
1> Referenced in libcurl.lib(easy.obj)
1> Loaded libcurl.lib(slist.obj)
所以我的代码使用了curl_easy_setopt(...),它没有任何问题,只是在我使用curl_easy_init(...)的同一区域
使用dumpbin.exe查看libcurl.lib中的符号,我看到:
SECTION HEADER #B
.text$mn name
0 physical address
0 virtual address
3D size of raw data
5D25 file pointer to raw data (00005D25 to 00005D61)
5D62 file pointer to relocation table
0 file pointer to line numbers
3 number of relocations
0 number of line numbers
60501020 flags
Code
COMDAT; sym= _curl_easy_init
16 byte align
Execute Read
哪个IMO显示符号os包含。至少它看起来与curl_easy_setopt:
非常相似SECTION HEADER #17
.text$mn name
0 physical address
0 virtual address
23 size of raw data
7245 file pointer to raw data (00007245 to 00007267)
7268 file pointer to relocation table
0 file pointer to line numbers
1 number of relocations
0 number of line numbers
60501020 flags
Code
COMDAT; sym= _curl_easy_setopt
16 byte align
Execute Read
这是使用libcurl的我的应用程序的编译器命令行:
/GS /debug:expr-source-pos /analyze /W3 /Zc:wchar_t /I"d:\develop\rm-
asset\c-code\include" /I"D:\develop\rm-asset\c-code\extensions\qq-pun-mel-l\src"
/O3 /Fd"R_Extended_Aliased\vc140.pdb" /fp:precise /fp:extended /D
"REAL_T_EXTENDED" /D "_HAVE_SQLITE_CONFIG_H" /D "SQLITE_ENABLE_REDEF_IO=1" /D
"SQLITE_ENABLE_CEROD=1" /D "SQLITE_DLL=1" /D "SQLITE_HAS_CODEC=1" /D
"BUILDING_DLL" /D "R2" /D "WIN32" /D "_DEBUG" /D "_WINDOWS" /D "_USRDLL" /D
"SAPHIRIONDLL_EXPORTS" /D "ZLIB_WINAPI" /D "NDEBUG" /D "CURL_STATICLIB" /D"USE_WINDOWS_SSPI" /D "USE_SCHANNEL" /D "USE_WIN32_IDN" /D "WANT_IDN_PROTOTYPES"
/D "_WINDLL" /D "_UNICODE" /D "UNICODE" /D "SQLITE_ENABLE_SESSION" /D
"SQLITE_ENABLE_PREUPDATE_HOOK" /Zc:forScope /Gz /MT /Fa"R_Extended_Aliased\"
/EHsc /nologo /Fo"R_Extended_Aliased\" /Qprof-dir "R_Extended_Aliased\" /Ot
/Fp"R_Extended_Aliased\saphirion.pch"
所以...我真的很困惑为什么这三个功能无法解决。任何想法要检查什么或如何进一步调查?
答案 0 :(得分:0)
原来是召集会议。因此,请确保使用libcurl的所有部分都使用__cdecl调用约定。