错误 LNK2001：未解析的外部符号 Visual C++
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error LNK2001: unresolved external symbol Visual C++
提问by Nabeel
Possible Duplicate:
static,extern,constin header file
I am working in Visual C++ and having this error.
我正在使用 Visual C++ 并遇到此错误。
I have declared below two extern lines in global.h seperately.
我在 global.h 中分别声明了以下两条 extern 行。
extern CSocketManager m_SocketManager[10];
extern CSocketManager* m_pCurServer;
1>ServerSocketDlg.obj : error LNK2001: unresolved external symbol "class CSocketManager * m_pCurServer" (?m_pCurServer@@3PAVCSocketManager@@A) 1>SocketManager.obj : error LNK2001: unresolved external symbol "class CSocketManager * m_pCurServer" (?m_pCurServer@@3PAVCSocketManager@@A)
Does anyone have an idea what might cause these errors?
有谁知道什么可能导致这些错误？
回答by Nikopol
Objects declared in the .h as extern also have to be declared in a .cpp file.
在 .h 中声明为 extern 的对象也必须在 .cpp 文件中声明。
The problem is that linker doesn't know where to find the two objects.
问题是链接器不知道在哪里可以找到这两个对象。
Solution: you also have to declare m_pCurServer in the .cpp file because it's the .cpp that is being compiled, not the header.
解决方案：您还必须在 .cpp 文件中声明 m_pCurServer，因为正在编译的是 .cpp，而不是头文件。
