Visual C++：CString，char*，int，COleDateTime，CTime，time_t之间的相互转换

获取当前时间。
datetime = COleDateTime::GetCurrentTime();
CTime和COleDateTime具有几乎同样的功能。
与CTime相比， COleDateTime的优点在于它支持DWORD变量。
COleDateTime使用的位数是双浮点的两倍，既然CTime只是简单地计算从1970年1月1日之后经过的秒数，所以到了2 0 3 7年它将达到4 2 9 4 9 6 7 2 9 5，从而不能再使用。
//CString--->COleDateTime
COleVariant vtime(strCString);COleDateTime time4=vtime;
//CTime--->time_t
COleDateTime time3(time2);
//time_t--->COleDateTime.

CString COleDateTime CTime互相转换
strCString="2003-10-27 6:24:37"; //CString--->COleDateTime
COleVariant vtime(strCString);
vtime.ChangeType(VT_DATE);
COleDateTime time4=vtime;

COleDateTime time1(1977,4,16,2,2,2); //COleDataTime--->CTime
SYSTEMTIME systime;
VariantTimeToSystemTime(time1, &systime);
CTime tm(systime);

time_t time2=tm.GetTime(); //CTime--->time_t
COleDateTime time3(time2); //time_t--->COleDateTime

CString str = tDate.Format(_T("%Y-%m-%d"));

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include
using namespace std;
#include

{
CString strCString="ABC";
char strchar[256],*pstr;

pstr=(LPSTR)(LPCTSTR)strCString; //CString---->char*
strcpy(strchar,(LPSTR)(LPCTSTR)strCString); //CString---->char[]

_bstr_t strbstr=pstr; //char*---->_bstr_t
WCHAR *strWCHAR=strbstr; //b_str_t--->UNICODE

strbstr=strWCHAR;
pstr=strbstr; //UNICODE---->char*

strCString="10";
int istr=atoi((LPSTR)(LPCTSTR)strCString); //CString、char[]、char*------>int
strCString.Format("%d",istr); //int----->CString
sprintf(strchar,"%d",istr); //int----->char[]

pstr=new char[256]; //字符串申请空间
strcpy(pstr,"ABC"); //字符串赋值
delete []pstr; //字符串释放

string strstring="ABC";
pstr=(char*)strstring.c_str(); //string---->char*

strCString="2003-10-27 6:24:37"; //CString--->COleDateTime
COleVariant vtime(strCString);
vtime.ChangeType(VT_DATE);
COleDateTime time4=vtime;



COleDateTime time1(1977,4,16,2,2,2); //COleDataTime--->CTime
SYSTEMTIME systime;
VariantTimeToSystemTime(time1, &systime);
CTime tm(systime);

time_t time2=tm.GetTime(); //CTime--->time_t
COleDateTime time3(time2); //time_t--->COleDateTime

//判断字符串是否是某种类型
CString sValue("123.1");
COleVariant vValue(sValue);

BOOL bStrIsFloat = (SUCCEEDED(VariantChangeType(&vValue, &vValue, 0, VT_R8)) && sValue.Find('.') != -1);
if(bStrIsFloat)
{
AfxMessageBox("浮点");
}
}