想给ActiveX加个返回字符串的方法

[swdmike]

可是Automation里面没用string或CString返回类型可选,怎么办?

[珍惜生命远离CPP]

返回BSTR类型

[cpp2017]

返回BSTR 用Cstring 的
AllocSysString()返回。

[WizardK]

BSTR或VARIANT，都可传输，但须转换

BSTR -> CHAR *

#include <comutil.h>
#pragma comment(lib, "comsupp.lib")

char * pc;
unsigned short * pus;

...
pc = _com_util::ConvertBSTRToString(pus);
...
delete [] pc;

[zjutyww]

给你个BSTR 的例子

BSTR TO char
STDMETHODIMP Cuseconfig::login_on(BSTR user, BSTR password,SHORT *ret)
{
char user2[32];
WideCharToMultiByte( CP_ACP, 0,

(LPCWSTR)user, -1,

user2, 32, NULL, NULL );

::SysFreeString(user);

}

Cstring to bstr
Cstring m_user;
int strLength ;
strLength = m_user.GetLength() + 1;
char *pusername = new char[strLength];
strncpy(pusername, m_user, strLength);

_bstr_t bstr_name(pusername);
delete pusername;

[wshcdr]

用BSTR就好..........