类导出DLL时的C4273警告

[ming6424]

warning C4273: 'IsTextFile' : inconsistent dll linkage. dllexport assumed.

我写了一个类，想把它导出，供其他同事使用。
但在生成Dll时，每个成员函数都有如上所示的警告。

请问这个问题应该如何解决？？？

#ifdef DLLDIR_EX
#define DLLDIR __declspec(dllexport) // export DLL information
#else
#define DLLDIR __declspec(dllimport) // import DLL information
#endif
//-----------------------------------------------------------------------------
class DLLDIR CMyClass
{
...
};

[DentistryDoctor]

Visual C++ Concepts: Building a C/C++ Program

Compiler Warning (level 1) C4273'function' : inconsistent DLL linkage
Two definitions in a file differ in their use of dllimport.
The following sample generates C4273:
// C4273.cpp
// compile with: /W1
char __declspec(dllimport) c;
char c; // C4273, delete this line or the line above to resolve

int main()
{
}