OLE字符串

一、概述

32位宽字符串，前面32位为长度,尾部以0结束

二、相关定义

BSTR (又称Basic 类型字符串)

LPOLESTR

相关宏定义:

typedef unsigned short wchar_t; (unsigned short为两字节)
typedef wchar_t WCHAR;
typedef WCHAR OLECHAR;　　(Win32)
typedef OLECHAR* BSTR;
typedef /* [string] */ OLECHAR __RPC_FAR *LPOLESTR;

三、使用

1.分配

// Create BSTR containing "Text"
bs = SysAllocString(L"Text")
// Create BSTR containing "Te"
bs = SysAllocStringLen(L"Text", 2)
// Create BSTR containing "Text" followed by \0 and a junk character
bs = SysAllocStringLen(L"Text", 6)
// Reallocate BSTR bs as "NewText"　重新赋值
f = SysReAllocString(&bs, "NewText");

2.长度

// Get character length of string.
cch = SysStringLen(bs);

3.释放

// Deallocate a string.
SysFreeString(bs);