VC不同类型之间的转换.doc

CString和 int1VARIANT 和int(VARIANT与其他类型的转换类似)1_bstr_t 和cstring1Cstring和CTime1Cstring和COleDateTime2字符和ASCII码2CString和 int (1)CString str; int a=100; str.Format(%d,a);(2) CSting str(1234);Int i=atoi(str);VARIANT 和int(VARIANT与其他类型的转换类似)(1)VARIANT b;Val=3;(2) int i=Val;_bstr_t 和cstring(1)_bstr_t s1(效力);CString s2;s2=_com_util:ConvertBSTRToString(s1);/_com_util是命名空间(2)_bstr_t s1(效力);CString s2;/CString可直接转化为_bstr_ts1= _com_util:ConvertStringToBSTR(s2);Cstring和CTime(1)Cstring到CTimeCString strCString=2004-08-12 14:45:22; COleVariant vtime(strCString); vtime.ChangeType(VT_DATE); COleDateTime time4=vtime; SYSTEMTIME systime; VariantTimeToSystemTime(time4, &systime); CTime tm(systime); (2)CTime到CstringCString str; CTime t = CTime:GetCurrentTime(); str.Format(%d-%d-%d,t.GetYear(),t.GetMonth(),t.GetDay();CString strTime; CTime tTime = CTime:GetCurrentTime(); strTime = tTime.Format(%Y-%m-%d %H:%M:%S);Cstring和COleDateTime(1) Cstring到COleVariantCString str = 2004-07-08 11:22:33; COleVariant VariantTime;VariantTime = str;VariantTime.ChangeType(VT_DATE);COleDateTime DataTime = VariantTime;(2) COleVariant到Cstring使用CString的Format来转换int nYear = DataTime.GetYear();int nMonth = DataTime.GetMonth();int nDay = DataTime.GetDay();int nHour = DataTime.GetHour();int nMin = DataTime.GetMinute();int nSec = DataTime.GetSecond();COleDateTime curTime=COleDateTime:GetCurrentTime();CString CurrentTime=curTime.Format(%Y-%m-%d %H:%M:%S);字符和ASCII码ch