C++ BSTR到STD：String(std：wstring)，反之亦然

 1 std::string ConvertBSTRToMBS(BSTR bstr)
 2 {
 3     int wslen = ::SysStringLen(bstr);
 4     return ConvertWCSToMBS((wchar_t*)bstr, wslen);
 5 }
 6 
 7 std::string ConvertWCSToMBS(const wchar_t* pstr, long wslen)
 8 {
 9     int len = ::WideCharToMultiByte(CP_ACP, 0, pstr, wslen, NULL, 0, NULL, NULL);
10 
11     std::string dblstr(len, '\0');
12     len = ::WideCharToMultiByte(CP_ACP, 0 /* no flags */,
13                                 pstr, wslen /* not necessary NULL-terminated */,
14                                 &dblstr[0], len,
15                                 NULL, NULL /* no default char */);
16 
17     return dblstr;
18 }
19 
20 BSTR ConvertMBSToBSTR(const std::string& str)
21 {
22     int wslen = ::MultiByteToWideChar(CP_ACP, 0 /* no flags */,
23                                       str.data(), str.length(),
24                                       NULL, 0);
25 
26     BSTR wsdata = ::SysAllocStringLen(NULL, wslen);
27     ::MultiByteToWideChar(CP_ACP, 0 /* no flags */,
28                           str.data(), str.length(),
29                           wsdata, wslen);
30     return wsdata;
31 }

1 // given BSTR bs
2 assert(bs != nullptr);
3 std::wstring ws(bs, SysStringLen(bs));

1 // given std::wstring ws
2 assert(!ws.empty());
3 BSTR bs = SysAllocStringLen(ws.data(), ws.size());

1 #include <comdef.h>
2 
3 BSTR bs = SysAllocString("Hello");
4 std::wstring myString = _bstr_t(bs, false); // will take over ownership, so no need to free

posted on 2021-08-13 11:38 一杯清酒邀明月阅读(420) 评论(0) 编辑收藏举报