很菜的问题。怎么增加static 成员变量

[yaoyao19762000]

基于对话框的一个应用程序。

class CImgProcessingDlg : public CDialog
{
onButtonOn()
{
CEnBitmag bm;
bm.ProcessImage(&CImageProcess);
}
}

class C32BitImageProcessor
{
}

class CImageProcess : public C32BitImageProcessor
{
->>>>>>>>>>>>static BYTE m_yPos;
static BYTE m_xPos;
static BYTE m_radious;

}

class CEnBitmap : public CBitmap
{
BOOL ProcessImage(C32BitImageProcessor* pProcessor);
}


编译不通过，ImageProcessors.obj : error LNK2001: unresolved external symbol "private: static unsigned char CImageProcess::m_radious" (?m_radious@CImageHough@@0EA)



多谢拉