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。

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<DIV class=3DpostText>&nbsp;
<P>VC=E5=B8=B8=E8=A7=81=E6=95=B0=E6=8D=AE=E7=B1=BB=E5=9E=8B=E8=BD=AC=E6=8D=
=A2=E8=AF=A6=E8=A7=A3</P>
<P>fixedstar | 26 =E4=B8=89=E6=9C=88, 2006 11:10</P>
<P>=E5=88=9A=E6=8E=A5=E8=A7=A6VC=E7=BC=96=E7=A8=8B=E7=9A=84=E6=9C=8B=E5=8F=
=8B=E5=BE=80=E5=BE=80=E5=AF=B9=E8=AE=B8=E5=A4=9A=E6=95=B0=E6=8D=AE=E7=B1=BB=
=E5=9E=8B=E7=9A=84=E8=BD=AC=E6=8D=A2=E6=84=9F=E5=88=B0=E8=BF=B7=E6=83=91=E4=
=B8=8D=E8=A7=A3=EF=BC=8C=E6=9C=AC=E6=96=87=E5=B0=86=E4=BB=8B=E7=BB=8D=E4=B8=
=80=E4=BA=9B=E5=B8=B8=E7=94=A8=E6=95=B0=E6=8D=AE=E7=B1=BB=E5=9E=8B=E7=9A=84=
=E4=BD=BF=E7=94=A8=E3=80=82 </P>
<P>&nbsp;</P>
<P>=E6=88=91=E4=BB=AC=E5=85=88=E5=AE=9A=E4=B9=89=E4=B8=80=E4=BA=9B=E5=B8=B8=
=E8=A7=81=E7=B1=BB=E5=9E=8B=E5=8F=98=E9=87=8F=E5=80=9F=E4=BB=A5=E8=AF=B4=E6=
=98=8E </P>
<P>int i =3D 100; <BR>long l =3D 2001; <BR>float f=3D300.2; <BR>double =
d=3D12345.119;=20
<BR>char username[]=3D"=E5=A5=B3=E4=BE=A0=E7=A8=8B=E4=BD=A9=E5=90=9B"; =
<BR>char temp[200]; <BR>char *buf; <BR>CString str;=20
<BR>_variant_t v1; <BR>_bstr_t v2; </P>
<P>=E4=B8=80=E3=80=81=E5=85=B6=E5=AE=83=E6=95=B0=E6=8D=AE=E7=B1=BB=E5=9E=8B=
=E8=BD=AC=E6=8D=A2=E4=B8=BA=E5=AD=97=E7=AC=A6=E4=B8=B2 </P>
<P><BR>=E7=9F=AD=E6=95=B4=E5=9E=8B(int) =
<BR>itoa(i,temp,10);///=E5=B0=86i=E8=BD=AC=E6=8D=A2=E4=B8=BA=E5=AD=97=E7=AC=
=A6=E4=B8=B2=E6=94=BE=E5=85=A5temp=E4=B8=AD,=E6=9C=80=E5=90=8E=E4=B8=80=E4=
=B8=AA=E6=95=B0=E5=AD=97=E8=A1=A8=E7=A4=BA=E5=8D=81=E8=BF=9B=E5=88=B6=20
<BR>itoa(i,temp,2); =
///=E6=8C=89=E4=BA=8C=E8=BF=9B=E5=88=B6=E6=96=B9=E5=BC=8F=E8=BD=AC=E6=8D=A2=
 <BR>=E9=95=BF=E6=95=B4=E5=9E=8B(long) <BR>ltoa(l,temp,10); </P>
<P><BR>=E4=BA=8C=E3=80=81=E4=BB=8E=E5=85=B6=E5=AE=83=E5=8C=85=E5=90=AB=E5=
=AD=97=E7=AC=A6=E4=B8=B2=E7=9A=84=E5=8F=98=E9=87=8F=E4=B8=AD=E8=8E=B7=E5=8F=
=96=E6=8C=87=E5=90=91=E8=AF=A5=E5=AD=97=E7=AC=A6=E4=B8=B2=E7=9A=84=E6=8C=87=
=E9=92=88 </P>
<P><BR>CString=E5=8F=98=E9=87=8F <BR>str =3D =
"2008=E5=8C=97=E4=BA=AC=E5=A5=A5=E8=BF=90"; <BR>buf =3D =
(LPSTR)(LPCTSTR)str;=20
<BR>BSTR=E7=B1=BB=E5=9E=8B=E7=9A=84_variant_t=E5=8F=98=E9=87=8F <BR>v1 =
=3D (_bstr_t)"=E7=A8=8B=E5=BA=8F=E5=91=98"; <BR>buf =3D=20
_com_util::ConvertBSTRToString((_bstr_t)v1); </P>
<P>=E4=B8=89=E3=80=81=E5=AD=97=E7=AC=A6=E4=B8=B2=E8=BD=AC=E6=8D=A2=E4=B8=BA=
=E5=85=B6=E5=AE=83=E6=95=B0=E6=8D=AE=E7=B1=BB=E5=9E=8B =
<BR>strcpy(temp,"123"); </P>
<P>=E7=9F=AD=E6=95=B4=E5=9E=8B(int) <BR>i =3D atoi(temp); =
<BR>=E9=95=BF=E6=95=B4=E5=9E=8B(long) <BR>l =3D atol(temp); =
<BR>=E6=B5=AE=E7=82=B9(double)=20
<BR>d =3D atof(temp); </P>
<P>=E5=9B=9B=E3=80=81=E5=85=B6=E5=AE=83=E6=95=B0=E6=8D=AE=E7=B1=BB=E5=9E=8B=
=E8=BD=AC=E6=8D=A2=E5=88=B0CString =
<BR>=E4=BD=BF=E7=94=A8CString=E7=9A=84=E6=88=90=E5=91=98=E5=87=BD=E6=95=B0=
Format=E6=9D=A5=E8=BD=AC=E6=8D=A2,=E4=BE=8B=E5=A6=82: </P>
<P><BR>=E6=95=B4=E6=95=B0(int) <BR>str.Format("%d",i); =
<BR>=E6=B5=AE=E7=82=B9=E6=95=B0(float) <BR>str.Format("%f",i);=20
<BR>=E5=AD=97=E7=AC=A6=E4=B8=B2=E6=8C=87=E9=92=88(char =
*)=E7=AD=89=E5=B7=B2=E7=BB=8F=E8=A2=ABCString=E6=9E=84=E9=80=A0=E5=87=BD=E6=
=95=B0=E6=94=AF=E6=8C=81=E7=9A=84=E6=95=B0=E6=8D=AE=E7=B1=BB=E5=9E=8B=E5=8F=
=AF=E4=BB=A5=E7=9B=B4=E6=8E=A5=E8=B5=8B=E5=80=BC <BR>str =3D username; =
</P>
<P>=E4=BA=94=E3=80=81BSTR=E3=80=81_bstr_t=E4=B8=8ECComBSTR </P>
<P><BR>CComBSTR=E3=80=81_bstr_t=E6=98=AF=E5=AF=B9BSTR=E7=9A=84=E5=B0=81=E8=
=A3=85,BSTR=E6=98=AF=E6=8C=87=E5=90=91=E5=AD=97=E7=AC=A6=E4=B8=B2=E7=9A=84=
32=E4=BD=8D=E6=8C=87=E9=92=88=E3=80=82 <BR>char =
*=E8=BD=AC=E6=8D=A2=E5=88=B0BSTR=E5=8F=AF=E4=BB=A5=E8=BF=99=E6=A0=B7: =
BSTR=20
b=3D_com_util::ConvertStringToBSTR("=E6=95=B0=E6=8D=AE");///=E4=BD=BF=E7=94=
=A8=E5=89=8D=E9=9C=80=E8=A6=81=E5=8A=A0=E4=B8=8A=E5=A4=B4=E6=96=87=E4=BB=B6=
comutil.h <BR>=E5=8F=8D=E4=B9=8B=E5=8F=AF=E4=BB=A5=E4=BD=BF=E7=94=A8char =

*p=3D_com_util::ConvertBSTRToString(b); </P>
<P><BR>=E5=85=AD=E3=80=81VARIANT =E3=80=81_variant_t =E4=B8=8E =
COleVariant </P>
<P><BR>VARIANT=E7=9A=84=E7=BB=93=E6=9E=84=E5=8F=AF=E4=BB=A5=E5=8F=82=E8=80=
=83=E5=A4=B4=E6=96=87=E4=BB=B6VC98IncludeOAIDL.H=E4=B8=AD=E5=85=B3=E4=BA=8E=
=E7=BB=93=E6=9E=84=E4=BD=93tagVARIANT=E7=9A=84=E5=AE=9A=E4=B9=89=E3=80=82=
=20
<BR>=E5=AF=B9=E4=BA=8EVARIANT=E5=8F=98=E9=87=8F=E7=9A=84=E8=B5=8B=E5=80=BC=
=EF=BC=9A=E9=A6=96=E5=85=88=E7=BB=99vt=E6=88=90=E5=91=98=E8=B5=8B=E5=80=BC=
=EF=BC=8C=E6=8C=87=E6=98=8E=E6=95=B0=E6=8D=AE=E7=B1=BB=E5=9E=8B=EF=BC=8C=E5=
=86=8D=E5=AF=B9=E8=81=94=E5=90=88=E7=BB=93=E6=9E=84=E4=B8=AD=E7=9B=B8=E5=90=
=8C=E6=95=B0=E6=8D=AE=E7=B1=BB=E5=9E=8B=E7=9A=84=E5=8F=98=E9=87=8F=E8=B5=8B=
=E5=80=BC=EF=BC=8C=E4=B8=BE=E4=B8=AA=E4=BE=8B=E5=AD=90=EF=BC=9A =
<BR>VARIANT va;=20
<BR>int a=3D2001; =
<BR>va.vt=3DVT_I4;///=E6=8C=87=E6=98=8E=E6=95=B4=E5=9E=8B=E6=95=B0=E6=8D=AE=
 <BR>va.lVal=3Da; ///=E8=B5=8B=E5=80=BC </P>
<P>=E5=AF=B9=E4=BA=8E=E4=B8=8D=E9=A9=AC=E4=B8=8A=E8=B5=8B=E5=80=BC=E7=9A=84=
VARIANT=EF=BC=8C=E6=9C=80=E5=A5=BD=E5=85=88=E7=94=A8Void =
VariantInit(VARIANTARG FAR*=20
pvarg);=E8=BF=9B=E8=A1=8C=E5=88=9D=E5=A7=8B=E5=8C=96,=E5=85=B6=E6=9C=AC=E8=
=B4=A8=E6=98=AF=E5=B0=86vt=E8=AE=BE=E7=BD=AE=E4=B8=BAVT_EMPTY,=E4=B8=8B=E8=
=A1=A8=E6=88=91=E4=BB=AC=E5=88=97=E4=B8=BEvt=E4=B8=8E=E5=B8=B8=E7=94=A8=E6=
=95=B0=E6=8D=AE=E7=9A=84=E5=AF=B9=E5=BA=94=E5=85=B3=E7=B3=BB: </P>