如何将 BSTR pVal 赋给：unsigned char *pw；如何将：unsigned char digest[16]赋给 BSTR *pOutVal

[visiond]

由于类型不同，我无法给下面两个赋值，请问要如何转换才可以啊？？

如何将：BSTR pVal 赋给：unsigned char *pw
如何将：unsigned char digest[16]赋给 BSTR *pOutVal

[kimryo]

CComBSTR b(digest);
*pOutVal=(BSTR)b;

[visiond]

编译这一句时报错： CComBSTR b(digest);

error C2664: '__thiscall ATL::CComBSTR::ATL::CComBSTR(int)' : cannot convert parameter 1 from 'unsigned char [16]' to 'int'
This conversion requires a reinterpret_cast, a C-style cast or function-style cast

[visiond]

谢谢kimryo(轻*轻*前*轻*重)，可以同你多交流吗？

我的QQ是：2950878
ICQ是：39407659
MAIL：[e-mail]

[kimryo]

UCHAR*没有好的办法，可试试这样：

USES_CONVERSION;
*pOutVal=SysAllocString(A2W((LPTSTR)digest));

[visiond]

谢谢

[kimryo]

*pOutVal=SysAllocString(digest);

[strip]

_bstr_t是com里面的一个类
一个简单的办法：
_bstr_t a = pVal;
pw = (char*)a;

_bstr_t b = digest;
pOutVal = (BSTR)b; //这个可能还需要改动一下，你自己去调试一把

[visiond]

谢谢

[visiond]

还是报错：
_bstr_t a = pVal;
pw = (char*)a;
报错如下：
cannot convert parameter 2 from 'char *' to 'unsigned char *'
Types pointed to are unrelated; conversion requires reinterpret_cast, C-style cast or function-style cast


_bstr_t b = digest;
pOutVal = (BSTR)b;
报错如下：

cannot convert from 'unsigned short *' to 'unsigned short ** '
Types pointed to are unrelated; conversion requires reinterpret_cast, C-style cast or function-style cast
如果我改为：
_bstr_t b = digest;
*pOutVal = (BSTR)b;//则报警告：

warning C4800: 'unsigned char *' : forcing value to bool 'true' or 'false' (performance warning)