2004/10/26 | VC中比较恶心的类型，也是最基本最常用的类型列表
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All of these constructors create new COleVariant objects initialized to the specified value. A brief description of each of these constructors follows.
•    COleVariant( ) Creates an empty COleVariant object, VT_EMPTY.
•    COleVariant( varSrc ) Copies an existing VARIANT or COleVariant object. The variant type is retained.
•    COleVariant( pSrc ) Copies an existing VARIANT or COleVariant object. The variant type is retained.
•    COleVariant( lpszSrc ) Copies a string into the new object, VT_BSTR (UNICODE).
•    COleVariant( lpszSrc, vtSrc ) Copies a string into the new object. The parameter vtSrc must be VT_BSTR (UNICODE) or VT_BSTRT (ANSI).
•    COleVariant( strSrc ) Copies a string into the new object, VT_BSTR (UNICODE).
•    COleVariant( nSrc ) Copies an 8-bit integer into the new object, VT_UI1.
•    COleVariant( nSrc, vtSrc ) Copies a 16-bit integer (or Boolean value) into the new object. The parameter vtSrc must be VT_I2 or VT_BOOL.
•    COleVariant( lSrc, vtSrc ) Copies a 32-bit integer (or SCODE value) into the new object. The parameter vtSrc must be VT_I4, VT_ERROR, or VT_BOOL.
•    COleVariant( curSrc ) Copies a COleCurrency value into the new object, VT_CY.
•    COleVariant( fltSrc ) Copies a 32-bit floating-point value into the new object, VT_R4.
•    COleVariant( dblSrc ) Copies a 64-bit floating-point value into the new object, VT_R8.
•    COleVariant( dateSrc ) Copies a COleDateTime value into the new object, VT_DATE.
•    COleVariant( arrSrc ) Copies a CByteArray object into the new object, VT_EMPTY.
•    COleVariant( lbSrc ) Copies a CLongBinary object into the new object, VT_EMPTY.
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