编译连接过程中出现了这样的错误:
Deleting intermediate files and output files for project 'SCportTest - Win32 Debug'.
--------------------Configuration: SCportTest - Win32 Debug--------------------
Linking...
SCportTestView.obj : error LNK2005: "char m_chChecksum" (?m_chChecksum@@3DA) already defined in SCportTest.obj
SCportTestView.obj : error LNK2005: "class CString m_strRXhhCOM1" (?m_strRXhhCOM1@@3VCString@@A) already defined in SCportTest.obj
SCportTestView.obj : error LNK2005: "class CString m_strRXDataCOM1" (?m_strRXDataCOM1@@3VCString@@A) already defined in SCportTest.obj
SCportTestView.obj : error LNK2005: "class CString m_strRXDataCOM2" (?m_strRXDataCOM2@@3VCString@@A) already defined in SCportTest.obj
SCportTestView.obj : error LNK2005: "unsigned int m_nRXDErrorCOM1" (?m_nRXDErrorCOM1@@3IA) already defined in SCportTest.obj
SCportTestView.obj : error LNK2005: "unsigned int m_nRXDErrorCOM2" (?m_nRXDErrorCOM2@@3IA) already defined in SCportTest.obj
SCportTestView.obj : error LNK2005: "unsigned int m_nRXCounterCOM1" (?m_nRXCounterCOM1@@3IA) already defined in SCportTest.obj
SCportTestView.obj : error LNK2005: "unsigned int m_nRXCounterCOM2" (?m_nRXCounterCOM2@@3IA) already defined in SCportTest.obj
S不知道怎么修改
谢谢
Deleting intermediate files and output files for project 'SCportTest - Win32 Debug'.
--------------------Configuration: SCportTest - Win32 Debug--------------------
Linking...
SCportTestView.obj : error LNK2005: "char m_chChecksum" (?m_chChecksum@@3DA) already defined in SCportTest.obj
SCportTestView.obj : error LNK2005: "class CString m_strRXhhCOM1" (?m_strRXhhCOM1@@3VCString@@A) already defined in SCportTest.obj
SCportTestView.obj : error LNK2005: "class CString m_strRXDataCOM1" (?m_strRXDataCOM1@@3VCString@@A) already defined in SCportTest.obj
SCportTestView.obj : error LNK2005: "class CString m_strRXDataCOM2" (?m_strRXDataCOM2@@3VCString@@A) already defined in SCportTest.obj
SCportTestView.obj : error LNK2005: "unsigned int m_nRXDErrorCOM1" (?m_nRXDErrorCOM1@@3IA) already defined in SCportTest.obj
SCportTestView.obj : error LNK2005: "unsigned int m_nRXDErrorCOM2" (?m_nRXDErrorCOM2@@3IA) already defined in SCportTest.obj
SCportTestView.obj : error LNK2005: "unsigned int m_nRXCounterCOM1" (?m_nRXCounterCOM1@@3IA) already defined in SCportTest.obj
SCportTestView.obj : error LNK2005: "unsigned int m_nRXCounterCOM2" (?m_nRXCounterCOM2@@3IA) already defined in SCportTest.obj
S不知道怎么修改
谢谢
2、楼上的楼上老兄说的ifdef里面要写什么呢?
谢谢
在cpp文件的顶部写char m_chChecksum;在.h文件中写extern char m_chChecksum;.h文件中写#ifndef ...
问题:
不知道为什么由在头文件中定义全局变量改变成只在头文件里面声明全局变量,就可以不出现重复定义的错误呢?
请解答,谢谢
2。extern char m_chChecksum; //这是声明一个变量;头文件一般都要被包含到别的文件,自己也要编译,因此如果在此定义变量,编译器至少会碰到两次,所以就重复定义拉。另:变量可以声明多次。