vc常见数据类型转换详解 - jamesxing的专栏 - csdnblog.mht

自己总结的VC++MEC控件篇基础知识。

<P>unsigned char bVal; VT_UI1 <BR>short iVal; VT_I2 <BR>long lVal; VT_I4 =

<BR>float fltVal; VT_R4 <BR>double dblVal; VT_R8 <BR>VARIANT_BOOL =
boolVal;=20
VT_BOOL <BR>SCODE scode; VT_ERROR <BR>CY cyVal; VT_CY <BR>DATE date; =
VT_DATE=20
<BR>BSTR bstrVal; VT_BSTR <BR>IUnknown FAR* punkVal; VT_UNKNOWN =
<BR>IDispatch=20
FAR* pdispVal; VT_DISPATCH <BR>SAFEARRAY FAR* parray; VT_ARRAY|* =
<BR>unsigned=20
char FAR* pbVal; VT_BYREF|VT_UI1 <BR>short FAR* piVal; VT_BYREF|VT_I2 =
<BR>long=20
FAR* plVal; VT_BYREF|VT_I4 <BR>float FAR* pfltVal; VT_BYREF|VT_R4 =
<BR>double=20
FAR* pdblVal; VT_BYREF|VT_R8 <BR>VARIANT_BOOL FAR* pboolVal; =
VT_BYREF|VT_BOOL=20
<BR>SCODE FAR* pscode; VT_BYREF|VT_ERROR <BR>CY FAR* pcyVal; =
VT_BYREF|VT_CY=20
<BR>DATE FAR* pdate; VT_BYREF|VT_DATE <BR>BSTR FAR* pbstrVal; =
VT_BYREF|VT_BSTR=20
<BR>IUnknown FAR* FAR* ppunkVal; VT_BYREF|VT_UNKNOWN <BR>IDispatch FAR* =
FAR*=20
ppdispVal; VT_BYREF|VT_DISPATCH <BR>SAFEARRAY FAR* FAR* pparray; =
VT_ARRAY|*=20
<BR>VARIANT FAR* pvarVal; VT_BYREF|VT_VARIANT <BR>void FAR* byref; =
VT_BYREF </P>
<P><BR>_variant_t=E6=98=AFVARIANT=E7=9A=84=E5=B0=81=E8=A3=85=E7=B1=BB=EF=BC=
=8C=E5=85=B6=E8=B5=8B=E5=80=BC=E5=8F=AF=E4=BB=A5=E4=BD=BF=E7=94=A8=E5=BC=BA=
=E5=88=B6=E7=B1=BB=E5=9E=8B=E8=BD=AC=E6=8D=A2=EF=BC=8C=E5=85=B6=E6=9E=84=E9=
=80=A0=E5=87=BD=E6=95=B0=E4=BC=9A=E8=87=AA=E5=8A=A8=E5=A4=84=E7=90=86=E8=BF=
=99=E4=BA=9B=E6=95=B0=E6=8D=AE=E7=B1=BB=E5=9E=8B=E3=80=82 =
<BR>=E4=BE=8B=E5=A6=82=EF=BC=9A <BR>long=20
l=3D222; <BR>ing i=3D100; <BR>_variant_t lVal(l); <BR>lVal =3D (long)i; =
</P>
<P><BR>COleVariant=E7=9A=84=E4=BD=BF=E7=94=A8=E4=B8=8E_variant_t=E7=9A=84=
=E6=96=B9=E6=B3=95=E5=9F=BA=E6=9C=AC=E4=B8=80=E6=A0=B7=EF=BC=8C=E8=AF=B7=E5=
=8F=82=E8=80=83=E5=A6=82=E4=B8=8B=E4=BE=8B=E5=AD=90=EF=BC=9A =
<BR>COleVariant v3 =3D "=E5=AD=97=E7=AC=A6=E4=B8=B2", v4=20
=3D (long)1999; <BR>CString str =3D(BSTR)v3.pbstrVal; <BR>long i =3D =
v4.lVal;=20
</P><BR><BR>
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