_variant_t怎么转换为float型呀？

[xinyi]

我从数据库中读出个数据，加减一个数后，在存回去，但_variant_t不可加减，所以先要变一下。

[lysaking]

static_cast<int>
或者用
union{
int i;
_variant_t v;
}
不知道可不可以

[gorge_an]

_variant_t total = _variant_t(pLeaf->m_elements[3]);
float fTotal = float(total);
fTotal --;
total = _variant_t(fTotal);

[idoloveyou]

统一 gorge_an(木头)
强制类型转换就可以

[蒋晟]

variant_t::ChangeType
void ChangeType( VARTYPE vartype, const _variant_t* pSrc = NULL ) throw( _com_error );

Parameters

vartype

the VARTYPE for this _variant_t object

pSrc

a pointer to the _variant_t object to be converted. If this value is NULL, conversion is done in place.

Remarks

This member function converts a _variant_t object into the indicated VARTYPE. If pSrc is NULL, the conversion is done in place, otherwise this _variant_t object is copied from pSrc and then converted.