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加声明

extern "C" __declspec(dllexport)

如

在.h文件中

#ifdef CDECODER_EXPORTS
#define CDECODER_API __declspec(dllexport)
#else
#define CDECODER_API __declspec(dllimport)
#endif

// This class is exported from the CDecoder.dll
extern "C" CDECODER_API char* czDecode(int width,int height,int step,int channel,unsigned char* pCapturedImage);