创建一个系统::从托管C++中的BSTR中获取String对象,这是个好主意吗?

RFC_PARAMETER aux;
Object* target;
RFC_UNICODE_TYPE_ELEMENT* elm;
elm = &(m_coreObject->m_pStructMeta->m_typeElements[index]);
aux.name = NULL;
aux.nlen = 0;
aux.type = elm->type;
aux.leng = elm->c2_length;
aux.addr = m_coreObject->m_rfcWa + elm->c2_offset;

GlobalFunctions::CreateObjectForRFCField(target,aux,elm->decimals);
GlobalFunctions::ReadRFCField(target,aux,elm->decimals);

其中GlobalFunctions::CreateObjectForRFCField创建了一个System::String对象,该对象中填充了空格(用于填充)以达到非托管库规定的最大长度:

static void CreateObjectForRFCField(Object*& object, RFC_PARAMETER& par, unsigned dec)
{
    switch (par.type)
    {
        case TYPC:
            object = new String(' ',par.leng / sizeof(_TCHAR));
            break;
        // unimportant afterwards.
    }
}

static void ReadRFCField(String* target, RFC_PARAMETER& par)
{
    int lngt;
    _TCHAR* srce;
    switch (par.type)
    {
        case TYPC:
        case TYPDATE:
        case TYPTIME:
        case TYPNUM:
            lngt = par.leng / sizeof(_TCHAR);
            srce = (_TCHAR*)par.addr;
            break;

        case RFCTYPE_STRING:
            lngt = (*(_TCHAR**)par.addr != NULL) ? (int)_tcslen(*(_TCHAR**)par.addr) : 0;
            srce = *(_TCHAR**)par.addr;
            break;

        default:
            throw new DotNet_Incomp_RFCType2;
    }

    if (lngt > target->Length) lngt = target->Length;

    GCHandle gh = GCHandle::Alloc(target,GCHandleType::Pinned);
    wchar_t* buff = reinterpret_cast<wchar_t*>(gh.AddrOfPinnedObject().ToPointer());
    _wcsnset(buff,' ',target->Length);
    _snwprintf(buff,lngt,_T2WFSP,srce);
    gh.Free();
}

是的, 我 错 这就是原因。

伊莱。