C++泛型類鏈接錯誤

Question

我在Visual C++應用程序中修改了一個現有類，使其成爲泛型類。此類由另外兩個模塊使用。當我分別編譯這些模塊時，一切正常。

1>Linking... 
1> Creating library C:\ccmdb\prep\g3_v5.3\g3_tools\fc_tools\ZFRTool\ZStackMTI\Debug\ZStackMTI.lib and object C:\ccmdb\prep\g3_v5.3\g3_tools\fc_tools\ZFRTool\ZStackMTI\Debug\ZStackMTI.exp 
1>SerialPort.obj : error LNK2019: unresolved external symbol "public: __thiscall CRingBuffer<unsigned char>::CRingBuffer<unsigned char>(unsigned long)" (??0?$CRingBuffer@E@@QAE@K@Z) referenced in function "public: __thiscall CSerialPort::CSerialPort(void)" (??0CSerialPort@@QAE@XZ) 
1>ZStackMTI.obj : error LNK2001: unresolved external symbol "public: __thiscall CRingBuffer<unsigned char>::CRingBuffer<unsigned char>(unsigned long)" (??0?$CRingBuffer@E@@QAE@K@Z) 
1>SerialPort.obj : error LNK2019: unresolved external symbol "public: __thiscall CRingBuffer<unsigned char>::~CRingBuffer<unsigned char>(void)" (??1?$CRingBuffer@E@@QAE@XZ) referenced in function "public: void * __thiscall CRingBuffer<unsigned char>::`scalar deleting destructor'(unsigned int)" (??_G?$CRingBuffer@E@@QAEPAXI@Z) 
1>ZStackMTI.obj : error LNK2001: unresolved external symbol "public: __thiscall CRingBuffer<unsigned char>::~CRingBuffer<unsigned char>(void)" (??1?$CRingBuffer@E@@QAE@XZ) 
1>SerialPort.obj : error LNK2019: unresolved external symbol "public: unsigned long __thiscall CRingBuffer<unsigned char>::GetBufferItems(void)" (?GetBufferItems@?$CRingBuffer@E@@QAEKXZ) referenced in function "public: unsigned long __thiscall CSerialPort::GetBufferedRxItems(void)" (?GetBufferedRxItems@CSerialPort@@QAEKXZ) 
1>SerialPort.obj : error LNK2019: unresolved external symbol "public: int __thiscall CRingBuffer<unsigned char>::Peek(unsigned char *,unsigned long,unsigned long *)" (?Peek@?$CRingBuffer@E@@QAEHPAEKPAK@Z) referenced in function "public: unsigned long __thiscall CSerialPort::Peek(unsigned char *,unsigned long,unsigned long *)" (?Peek@CSerialPort@@QAEKPAEKPAK@Z) 
1>SerialPort.obj : error LNK2019: unresolved external symbol "public: int __thiscall CRingBuffer<unsigned char>::Remove(unsigned char *,unsigned long,unsigned long *)" (?Remove@?$CRingBuffer@E@@QAEHPAEKPAK@Z) referenced in function "public: unsigned long __thiscall CSerialPort::Read(unsigned char *,unsigned long,unsigned long *)" (?Read@CSerialPort@@QAEKPAEKPAK@Z) 
1>ZStackMTI.obj : error LNK2001: unresolved external symbol "public: int __thiscall CRingBuffer<unsigned char>::Remove(unsigned char *,unsigned long,unsigned long *)" (?Remove@?$CRingBuffer@E@@QAEHPAEKPAK@Z) 
1>SerialPort.obj : error LNK2019: unresolved external symbol "public: int __thiscall CRingBuffer<unsigned char>::Add(unsigned char *,unsigned long,int)" (?Add@?$CRingBuffer@E@@QAEHPAEKH@Z) referenced in function "public: unsigned long __thiscall CSerialPort::Write(unsigned char *,unsigned long)" (?Write@CSerialPort@@QAEKPAEK@Z) 
1>ZStackMTI.obj : error LNK2001: unresolved external symbol "public: int __thiscall CRingBuffer<unsigned char>::Add(unsigned char *,unsigned long,int)" (?Add@?$CRingBuffer@E@@QAEHPAEKH@Z) 
1>SerialPort.obj : error LNK2019: unresolved external symbol "public: int __thiscall CRingBuffer<unsigned char>::Delete(unsigned long)" (?Delete@?$CRingBuffer@E@@QAEHK@Z) referenced in function "public: unsigned long __thiscall CSerialPort::Delete(unsigned long,int)" (?Delete@CSerialPort@@QAEKKH@Z) 
1>SerialPort.obj : error LNK2019: unresolved external symbol "public: int __thiscall CRingBuffer<unsigned char>::Flush(void)" (?Flush@?$CRingBuffer@E@@QAEHXZ) referenced in function "public: unsigned long __thiscall CSerialPort::Flush(int)" (?Flush@CSerialPort@@QAEKH@Z) 
1>ZStackMTI.obj : error LNK2019: unresolved external symbol "public: unsigned char __thiscall CRingBuffer<unsigned char>::Peek(unsigned long)" (?Peek@?$CRingBuffer@E@@QAEEK@Z) referenced in function "unsigned long __cdecl ZBNConnect_GetExtAddr(unsigned char *)" (?ZBNConnect_GetExtAddr@@YAKPAE@Z) 
1>C:\ccmdb\prep\g3_v5.3\g3_tools\fc_tools\ZFRTool\ZStackMTI\Debug\ZStackMTI.dll : fatal error LNK1120: 9 unresolved externals 
1>Build log was saved at "file://c:\ccmdb\prep\g3_v5.3\g3_tools\fc_tools\ZFRTool\ZStackMTI\ZStackMTI\Debug\BuildLog.htm" 
1>ZStackMTI - 14 error(s), 0 warning(s) 

我使用Visual Studio 2008。有誰知道如何解決這個問題：然而，當我做了建立所有，我得到這些鏈接錯誤？在修改之前，所有內容和鏈接都沒有任何問題。謝謝。

Answer 1

在頭文件中實現您的模板函數。

當編譯器需要從模板創建實際類時看到整個類模板。見例如Why should the implementation and the declaration of a template class be in the same header file?

Answer 2

這可能是因爲鏈接器無法找到具體類的方法體。

當您使用聲明模板化類的具體實例時，一種解決方法是包括實際的.cpp文件而不是.h文件。