在打开数据库中的表时,我是用下列方式打开的
m_pRecordset->Open("SELECT * FROM STUDENTS",theApp.m_pDBConnect.GetInterfacePtr()
adOpenDynamic,
adLockOptimistic,
adCmdText);
但编译时总出现下列错误:DialogSTU.obj : error LNK2001: unresolved external symbol "class CYDMSApp theApp" (?theApp@@3VCYDMSApp@@A)
搞得我不知其所以然,但我想问题是与theApp有关的,请教各路高手帮小弟看看如何解决;
m_pRecordset->Open("SELECT * FROM STUDENTS",theApp.m_pDBConnect.GetInterfacePtr()
adOpenDynamic,
adLockOptimistic,
adCmdText);
但编译时总出现下列错误:DialogSTU.obj : error LNK2001: unresolved external symbol "class CYDMSApp theApp" (?theApp@@3VCYDMSApp@@A)
搞得我不知其所以然,但我想问题是与theApp有关的,请教各路高手帮小弟看看如何解决;
DMS.obj : error LNK2005: "class CYDMSApp theApp" (?theApp@@3VCYDMSApp@@A) already defined in DialogSTU.obj
YDMSDlg.obj : error LNK2005: "class CYDMSApp theApp" (?theApp@@3VCYDMSApp@@A) already defined in DialogSTU.obj
Debug/YDMS.exe : fatal error LNK1169: one or more multiply defined symbols found
执行 link.exe 时出错.
怎么回事?
D:\vcstudy\YDMS\DialogSTU.cpp(94) : error C2227: left of '->m_pDBConnect' must point to class/struct/union
D:\vcstudy\YDMS\DialogSTU.cpp(94) : error C2228: left of '.GetInterfacePtr' must have class/struct/union type
执行 cl.exe 时出错.
在定义中,theApp已经是全局变量了,不可能没有定义啊,
你重复定义了.
'theApp' 第一:你在原来地方定义的时候你删除没
D:\vcstudy\YDMS\DialogSTU.cpp(94) : error C2065: 'theApp' : undeclared identifier
没定义.重新生成代码试试
2,因为theApp是声明在.cpp中的,所以你引用时要在相关cpp文件中声明extern CMyApp theApp;