请问要是编译的时候出现obj文件错误怎么改?
SerialPortTestDlg.obj : error LNK2001: unresolved external symbol "public: int __thiscall CSerialPort::ClosePort(void)" (?ClosePort@CSerialPort@@QAEHXZ)
Debug/SerialPortTest.exe : fatal error LNK1120: 1 unresolved externals
Error executing link.exe.
SerialPortTest.exe - 2 error(s), 0 warning(s)