調用usb類的時候，出現下面這些錯誤
Linking…
usb.obj : error LNK2001: unresolved external symbol “public: virtual __thiscall LsComm::CComPort::~CComPort(void)” (??1CComPort@LsComm@@UAE@XZ)
usb.obj : error LNK2001: unresolved external symbol “public: __thiscall LsComm::CComPort::CComPort(void)” (??0CComPort@LsComm@@QAE@XZ)
usb.obj : error LNK2001: unresolved external symbol “public: unsigned long __thiscall LsComm::CComPort::Output(void *,unsigned long)” (?Output@CComPort@LsComm@@QAEKPAXK@Z)
usb.obj : error LNK2001: unresolved external symbol “public: bool __thiscall LsComm::CComPort::IsOpen(void)” (?IsOpen@CComPort@LsComm@@QAE_NXZ)
usb.obj : error LNK2001: unresolved external symbol “public: unsigned long __thiscall LsComm::CComPort::GetInput(void *,unsigned long,unsigned long)” (?GetInput@CComPort@LsComm@@QAEKPAXKK@Z)
usb.obj : error LNK2001: unresolved external symbol “public: void __thiscall CSerialPort::SetDTR(void)” (?SetDTR@CSerialPort@@QAEXXZ)
usb.obj : error LNK2001: unresolved external symbol “public: void __thiscall CSerialPort::SetRTS(void)” (?SetRTS@CSerialPort@@QAEXXZ)
usb.obj : error LNK2001: unresolved external symbol “public: class CSerialPort * __thiscall LsComm::CComPort::GetSerialPort(void)” (?GetSerialPort@CComPort@LsComm@@QAEPAVCSerialPort@@XZ)
usb.obj : error LNK2001: unresolved external symbol “public: bool __thiscall LsComm::CComPort::Open(int,unsigned long,enum LsComm::CComPort::ReceiveMode,enum LsComm::CComPort::Parity,unsigned char,enum LsComm::CComPort::StopBits,enum LsComm::CComPor
t::FlowControl)” (?Open@CComPort@LsComm@@QAE_NHKW4ReceiveMode@12@W4Parity@12@EW4StopBits@12@W4FlowControl@12@@Z)
usb.obj : error LNK2001: unresolved external symbol “public: void __thiscall LsComm::CComPort::Close(void)” (?Close@CComPort@LsComm@@QAEXXZ)
Debug/CloudspeakerDownload.exe : fatal error LNK1120: 10 unresolved externals
Error executing link.exe
解決辦法：這里面是一個類中調用另外一個類的函數，但類外一個類并沒有添加到工程中來。但usb類又調用了其他類的頭文件，所有不會報沒有這個函數的錯誤，只會報無法解析的錯誤

總結

以上是生活随笔為你收集整理的usb类调用失败解释的全部內容，希望文章能夠幫你解決所遇到的問題。

如果覺得生活随笔網站內容還不錯，歡迎將生活随笔推薦給好友。