C语言中link的错误解决方案.docx

link错误-link4098 libcmtd.lib(tolower.obj) : error LNK2005: __tolower already defined in libcd.lib(tolower.obj)libcmtd.lib(tolower.obj) : error LNK2005: _tolower already defined in libcd.lib(tolower.obj)libcd.lib(crt0init.obj) : warning LNK4098: defaultlib libcmtd.lib conflicts with use of other libs; use /NODEFAULTLIB:library Debug/VGS2DEBUGDLL.exe : fatal error LNK1169: one or more multiply defined symbols foundError executing link.exe. 解决方案：Project - Settings - Link - project option中加入/nodefaultlib:LIBCMTD error LNK2001: unresolved external symbol _main解决办法 ? 解决外部符号错误:_main,_WinMain@16,__beginthreadex 在创建MFC项目时, 不使用MFC AppWizard向导, 如果没有柚煤孟钅坎问? 就会在编译时产生很多连接错误, 如error LNK2001错误, 典型的错误提示有: libcmtd.lib(crt0.obj) : error LNK2001: unresolved external symbol _main LIBCD.lib(wincrt0.obj) : error LNK2001: unresolved external symbol _WinMain@16 msvcrtd.lib(crtexew.obj) : error LNK2001: unresolved external symbol _WinMain@16 nafxcwd.lib(thrdcore.obj) : error LNK2001: unresolved external symbol __beginthreadex nafxcwd.lib(thrdcore.obj) : error LNK2001: unresolved external symbol __endthreadex 1. Windows子系统设置错误, 提示: libcmtd.lib(crt0.obj) : error LNK2001: unresolved external symbol _main Windows项目要使用Windows子系统, 而不是Console, 可以这样设置: [Project] -- [Settings] -- 选择Link属性页，在Project Options中将/subsystem:console改成/subsystem:windows? 2. Console子系统设置错误, 提示: LIBCD.lib(wincrt0.obj) : error LNK2001: unresolved external symbol _WinMain@16 控制台项目要使用Console子系统, 而不是Windows, 设置: [Project] -- [Settings] -- 选择Link属性页,在Project Options中将/subsystem:windows改成/subsystem:console 3. 程序入口设置错误, 提示: msvcrtd.lib(crtexew.obj) : error LNK2001: unresolved external symbol _WinMain@16 s 通常, MFC项目的程序入口函数是WinMain, 如果编译项目的Unicode版本, 程序入口必须改为wWinMainCRTStartup, 所以需要重新设置程序入口: r [Project] -- [Settings] -- 选择Link属性页,在Category中选择Output,再在Entry-point symbol中填入wWinMainCRTStartup, 即可 4. 线程运行时库设置错误, 提示: nafxcwd.lib(thrdcore.obj) : error LNK2001: unresolved external symbol __beginthreadex nafxcwd.lib(thrdcore.obj) : e