Question

如何把一个日期字符串转成_variant_t，日期类型

CString szTime("2008-8-8 08:08:08");把这个szTime转换成 _variant_t类型怎么做？

Answer 1

1.CString可以直接转_variant_t。
CString szTime("2008-8-8 08:08:08");
_variant_t mt = szTime;
2._variant_t转CString用如下函数:
CString VariantToCString(_variant_t var)
{

CString str; //转换以后的字符串

switch(var.vt)

{

case VT_BSTR: //var is BSTR type

str=var.bstrVal;

break;

case VT_I2: //var is short int type

str.Format("%d",(int)var.iVal);

break;

case VT_I4: //var is long int type

str.Format("%d",var.lVal);

break;

case VT_R4: //var is float type

str.Format(".6f",(double)var.fltVal);

break;

case VT_R8: //var is double type

str.Format(".6f",var.dblVal);

break;

case VT_CY: //var is CY type

str=COleCurrency(var).Format();

break;

case VT_DATE: //var is DATE type

str=COleDateTime(var).Format();

break;

case VT_BOOL: //var is VARIANT_BOOL

str= (var.boolVal==0) ?L"FALSE": L"TRUE";

break;

default:

str.Format("Unk type %d\n",var.vt);

TRACE("Unknown type %d\n",var.vt);

}

return str;

}