#include&quot什么意思;data.h&quot什么意思; void Date::sql_insert(_bstr_t sq...

各种字符串类型二(_bstr_t)
二._bstr_t类
_bstr_t类是封装了BSTR的数据类型。
Requirements
comsupp.lib
  构造函数:
);   _bstr_t(const
  _bstr_t(const char*
s2 );   _bstr_t(const
s3 );   _bstr_t(const
_variant_t&
&&&&&&&&&&&&
_bstr_t(BSTR
fCopy ); //如果是否的话bstr直接附加到此对象中而不会调用SysAllocString这个函数。
 常用操作:
  unsigned
int length ( ): //返回被封装的BSTR的字符串的长度。
GetBSTR( ); //返回被封装的BSTR的字符串指针
Assign(BSTR
//将s复制到_bstr_t中,此后对象中的内容就是_bstr_t了
Attach(BSTR
//将_bstr_t对象与s关联起来,如果_bstr_t原来有关联有其它的BSTR,则清除原来的串,并将s关联上去。
fCopy = true)
//返回被封装的BSTR串的一个拷贝,若fCopy为true的话是重制一个BSTR串并返回,若为false的话是直接返回被封装的那个BSTR串。
Detach( );//将封装的BSTR从_bstr_t中剥离并返回,此时_bstr_t的串为空
  operator
const wchar_t*( ) const throw( );
  operator
wchar_t*( ) const throw( );
  operator
const char*( )
  operator
_bstr_t重载了+,+=,=,!,==,!=,&,&,&=,&=等运算符
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Random EntriesMFC中,m_Grid.SetItemText(0,5,(char*)(_bstr_t)m_pRecordset-&GetCollect(&EMP_dep&));语句执行时程序出_百度知道
MFC中,m_Grid.SetItemText(0,5,(char*)(_bstr_t)m_pRecordset-&GetCollect(&EMP_dep&));语句执行时程序出
MFC中,m_Grid.SetItemText(0,5,(char*)(_bstr_t)m_pRecordset-&GetCollect(&EMP_dep&));语句执行时程序出现异常!!因为数据库中EMP_dep的值是空值,怎样才能显示这个空值呢???换句话说就是如何才能用SetItemText()函数来显示数据库中的空值呢??将空值显示在列表视图控件(ListCtrl)中??
提问者采纳
空值不显示就可以了.显示和没显示一样的,看不出区别.
其实是我搞错了,并不是空值引起的问题,我有个新问题,就是数据库中有个datatime类型的属性列 EMP_entryDate 用m_Grid.SetItemText(0,7,(char*)(_bstr_t)m_pRecordset-&GetCollect(&EMP_entryDate&));时老出现异常!!不知道怎么解决??其它类型的数据都能显示,就这个日期类型不行,不知老兄能否帮忙解决???
你百度:datatime 转char 就有结果。
提问者评价
谢谢了,已解决!
其他类似问题
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其他1条回答
你好,请问你说的不是空值引起的问题,那是什么问题呢?我也遇到了这样的问题。
getcollect的相关知识
等待您来回答
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出门在外也不愁我获取到一个字符串 比如 _bstr_ uid= yonghu(......) 我想去掉yonghu 这个应该怎么搞?_百度知道
我获取到一个字符串 比如 _bstr_ uid= yonghu(......) 我想去掉yonghu 这个应该怎么搞?
uid= yonghu();
括号里可以是字母 数字 下划线什么的
怎么将yonghu这几个字母除去。可以用需要两种方法一种 MFC
中ATL; 求助 帮帮我。。。。搞好 发我邮箱  我一定重谢!
提问者采纳
要除去一个字符串中的字母,就简单的方法就是用字符串替换,C++中有现成的函数可以用,你仔细下面这个例子, str1是替换之后的字符串 ,str2是原字符串#include &iostream&#include &string&#include &cstdlib& int main(){
std::string str1(&_bstr_ uid= yonghu(......)&);
std::string str2 = str1;
std::string subs(&yonghu&);
size_t pos = str1.find( subs );
str1.replace(pos, subs.length(), &&);
std::cout && str1 && '\n';
std::cout && str2 && '\n';}
提问者评价
ATL的该怎么搞?
来自:求助得到的回答
其他类似问题
bstr的相关知识
等待您来回答
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推荐过这篇日志的人:
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