c++ - 如何连接CComBSTR和字符串？

Question

如何连接CComBSTR和字符串？

我已经尝试过这种方法:

CComBSTR a = "DEF";
CComBSTR strRequete = "ABC'" + a + "GHI"; //marked line

但是我在标记行的a上收到错误:

Error: expression must have integral or unscoped enum type.

非常感谢!

Answer 1

要连接，您有 8 methods :

HRESULT Append(LPCOLESTR lpsz, int nLen);             
HRESULT Append(LPCOLESTR lpsz);                       
HRESULT Append(LPCSTR);                               
HRESULT Append(char ch);                              
HRESULT Append(wchar_t ch);                           

HRESULT Append(const CComBSTR& bstrSrc);          
CComBSTR& operator+=(const CComBSTR& bstrSrc);

HRESULT AppendBSTR(BSTR p);  

使用 += 运算符，您可以像这样附加:

CComBSTR strSentence = OLESTR("Now is the time ");

// strSentence contains "Now is the time "
CComBSTR str11 (OLESTR("for all good men ");
// calls Append(const CComBSTR& bstrSrc);
strSentence.Append(str11);
// strSentence contains "Now is the time for all good men "
// calls Append(LPCOLESTR lpsz);
strSentence.Append((OLESTR("to come "));
// strSentence contains "Now is the time for all good men to come "
// calls Append(LPCSTR lpsz);
strSentence.Append("to the aid ");
// strSentence contains
// "Now is the time for all good men to come to the aid "

CComBSTR str12 (OLESTR("of their country"));
strSentence += str12; // calls operator+=()
// "Now is the time for all good men to come to
// the aid of their country"

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