windows 如何获取_bstr_t的长度

How to get the length of a _bstr_t

提问by Lumpi

I am copying a wstring to a _bstr_t using:

我正在使用以下命令将 wstring 复制到 _bstr_t：

_bstr_t name;           
SysFreeString(name);   // Free previous string, if any.
name = SysAllocString(Member[k].Membername);

Now before I use "name" I want to check if it contains at least 5 characters. In other words, I want to check the length of it.

现在在我使用“名称”之前，我想检查它是否至少包含 5 个字符。换句话说，我想检查它的长度。

I didn't find a "countof" or "len" or something like that. Has anyone a idea?

我没有找到“countof”或“len”或类似的东西。有人有想法吗？

Thanks, Lumpi

谢谢，伦皮

回答by Benjamin Lindley

name.length()

http://msdn.microsoft.com/en-us/library/zthfhkd6%28v=VS.100%29.aspx

http://msdn.microsoft.com/en-us/library/zthfhkd6%28v=VS.100%29.aspx