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POCan a class have multiple thread function?
 

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  1. POCan a class have multiple thread function?
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    <p>I wrote a class that can do some work in another thread:</p> <pre><code> class SkeData { public: SkeData(INuiSensor* pSensor); ~SkeData(); HANDLE StartSaveSkeData_Frames(int nFrames = 1); HANDLE StartSaveSkeData2File_Frames(HANDLE hFile,int nFrames = 1); [...] private: //Two thread functions static DWORD WINAPI AddFrames(LPVOID lpParam); static DWORD WINAPI AddFrames2File(LPVOID lpParam); [...] }; HANDLE SkeData::StartSaveSkeData_Frames(int nFrames) { [...] m_hThread = CreateThread(NULL, 0, AddFrames, this, 0, NULL); return m_hThread; } HANDLE SkeData::StartSaveSkeData2File_Frames(HANDLE hFile,int nFrames) { [...] m_hThread = CreateThread(NULL, 0, AddFrames2File, this, 0, NULL); return m_hThread; } DWORD WINAPI SkeData::AddFrames(LPVOID lpParam) { SkeData *This = (SkeData *)lpParam; return This-&gt;Thread_AddFrames(); } DWORD WINAPI SkeData::AddFrames2File(LPVOID lpParam) { SkeData *This = (SkeData *)lpParam; return This-&gt;Thread_AddFrames2File(); } When I built the program solution in VS2010, linking error came up like this: SkeData.obj : error LNK2019: unresolved external symbol "private: unsigned long __thiscall SkeData::Thread_AddFrames2File(void)" (?Thread_AddFrames2File@SkeData@@AAEKXZ) referenced in function "private: static unsigned long __stdcall SkeData::AddFrames2File(void *)" (?AddFrames2File@SkeData@@CGKPAX@Z) 1&gt;E:\***\DataCollection.exe : fatal error LNK1120: 1 unresolved externals 1&gt; 1&gt;Build FAILED. </code></pre> <p>However, when I removed one of the thread functions, it can be successfully built. Thus I guess the reason to the error is something about the thread function. But I still don't understand why I can not add one more thread function in my class???</p> <p>I hope anyone can give more explanations.</p> <p>Thank you!</p> <p>More: Sorry there's something wrong when I pasted my code..I did implement both of the thread functions...And if I didn't, the error will not be like this ,right?</p>
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    1. USeaglesky
    1. USeaglesky
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      1. POCan a class have multiple thread function?
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      1. VTUpMod
    1. COBecause you never *added* one more thread function; You *claimed* you did by adding the prototype member to the class *declaration*, but you never *implemented* it (at least that you have shown here).
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    2. CODid you read the error message? What made you think that the linker error has to do with multithreading?
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      1. USstakx
    3. CO@stakx:Of course I read the error message..The reason I thought it's about multithreading is because when I removed one of the thread functions, it can be successfully built.
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