Question

菜鸟提问 VC++

Linking...
Creating library Debug/usb.lib and object Debug/usb.exp
Cpp1.obj : error LNK2001: unresolved external symbol "protected: static struct AFX_MSGMAP const CWinApp::messageMap" (?messageMap@CWinApp@@1UAFX_MSGMAP@@B)
Cpp1.obj : error LNK2001: unresolved external symbol "public: virtual int __thiscall CWinApp::OnDDECommand(char *)" (?OnDDECommand@CWinApp@@UAEHPAD@Z)
Cpp1.obj : error LNK2001: unresolved external symbol "public: virtual void __thiscall CWinApp::DoWaitCursor(int)" (?DoWaitCursor@CWinApp@@UAEXH@Z)
Cpp1.obj : error LNK2001: unresolved external symbol "public: virtual int __thiscall CWinApp::DoMessageBox(char const *,unsigned int,unsigned int)" (?DoMessageBox@CWinApp@@UAEHPBDII@Z)
...
Cpp1.obj : error LNK2001: unresolved external symbol "public: virtual void __thiscall CWinApp::AddToRecentFileList(char const *)" (?AddToRecentFileList@CWinApp@@UAEXPBD@Z)
Cpp1.obj : error LNK2001: unresolved external symbol "public: virtual class CDocument * __thiscall CWinApp::OpenDocumentFile(char const *)" (?OpenDocumentFile@CWinApp@@UAEPAVCDocument@@PBD@Z)
Cpp1.obj : error LNK2001: unresolved external symbol "public: virtual int __thiscall CWinThread::ProcessMessageFilter(int,struct tagMSG *)" (?ProcessMessageFilter@CWinThread@@UAEHHPAUtagMSG@@@Z)
Cpp1.obj : error LNK2001: unresolved external symbol "public: virtual long __thiscall CWinApp::ProcessWndProcException(class CException *,struct tagMSG const *)" (?ProcessWndProcException@CWinApp@@UAEJPAVCException@@PBUtagMSG@@@Z)
Cpp1.obj : error LNK2001: unresolved external symbol "protected: virtual struct IConnectionPoint * __thiscall CCmdTarget::GetConnectionHook(struct _GUID const &)" (?GetConnectionHook@CCmdTarget@@MAEPAUIConnectionPoint@@ABU_GUID@@@Z)
...Cpp1.obj : error LNK2001: unresolved external symbol "protected: virtual struct AFX_CONNECTIONMAP const * __thiscall CCmdTarget::GetConnectionMap(void)const " (?GetConnectionMap@CCmdTarget@@MBEPBUAFX_CONNECTIONMAP@@XZ)
Cpp1.obj : error LNK2001: unresolved external symbol "public: virtual void __thiscall CCmdTarget::OnFinalRelease(void)" (?OnFinalRelease@CCmdTarget@@UAEXXZ)
Cpp1.obj : error LNK2001: unresolved external symbol "public: virtual int __thiscall CCmdTarget::OnCmdMsg(unsigned int,int,void *,struct AFX_CMDHANDLERINFO *)"
Cpp1.obj : error LNK2001: unresolved external symbol "public: static void __stdcall CObject::operator delete(void *)" (??3CObject@@SGXPAX@Z)
Cpp1.obj : error LNK2001: unresolved external symbol "public: virtual __thiscall CWinApp::~CWinApp(void)" (??1CWinApp@@UAE@XZ)
Cpp1.obj : error LNK2001: unresolved external symbol "int __stdcall AfxMessageBox(char const *,unsigned int,unsigned int)" (?AfxMessageBox@@YGHPBDII@Z)
LIBCD.lib(wincrt0.obj) : error LNK2001: unresolved external symbol _WinMain@16
Debug/usb.exe : fatal error LNK1120: 46 unresolved externals
Error executing link.exe.
Creating browse info file...

usb.exe - 47 error(s), 0 warning(s)
能不能说详细些 我就是建的应用程序哈

Answer 1

unresolved external symbol 的意思是不确定的外部“符号”
引起该错误的原因很多
引用的函数、变量不存在、拼写不正确或者使用错误可能引起该错误
或者不正确的/subsystem也可能引起
类中的构造函数没有实现也会出现该问题
解决办法：
工程->设置->连接 工程选项中 找到/subsystem:windows 将windows改为console
若还出现该错误 可在类的构造函数中加上实现
具体是直接在后面加花括号{}即可

Answer 2

建立包含MFC的应用程序。

控制台程序不能使用MFC的类。