几个字符串转换函数（ANSI-->Unicode）

都是WINAPI ： MultiByteToWideChar的各种应用！

 

纯C++非MFC版：

/// <summary>/// 字符串转换函数（ANSI-->Unicode）/// </summary>/// <param name="lpMultiByteStr"> 被转换的ANSI字符串 </param> /// <param name="lpWideCharStr"> 接收Unicode字符串的地址,内部初始化 </param> /// <returns>/// The function returns 0 if it does not succeed./// Returns the number of characters written to the buffer indicated by lpWideCharStr if successful/// </returns>/// <remarks>/// </remarks>static int MByteToWChar(const char* lpMultiByteStr, std::unique_ptr<wchar_t>& lpWideCharStr){// Get the required size of the buffer that receives the Unicode string.// If the function succeeds(!=0) and cchWideChar is 0, the return value // is the required size, in characters, for the buffer indicated by lpWideCharStr. DWORD dwMinSize  = MultiByteToWideChar (CP_ACP, 0, lpMultiByteStr, -1, NULL, 0);if ( dwMinSize == 0 ){return 0;}lpWideCharStr.reset( new wchar_t[dwMinSize] );// Convert headers from ASCII to Unicode.return MultiByteToWideChar (CP_ACP, 0, lpMultiByteStr, -1, lpWideCharStr.get(), dwMinSize);}

 

 

MFC库源代码版：

int __stdcall CMFCControlContainer::UTF8ToString(LPCSTR lpSrc, CString& strDst, int nLength){LPTSTR lpDst = NULL;int count = ::MultiByteToWideChar(CP_UTF8, 0, lpSrc, nLength, NULL, 0);if (count <= 0){return 0;}LPWSTR lpWide = new WCHAR[count + 1];memset(lpWide, 0, (count + 1) * sizeof(WCHAR));::MultiByteToWideChar(CP_UTF8, 0, lpSrc, nLength, lpWide, count);#ifdef _UNICODElpDst = lpWide;#elsecount = ::WideCharToMultiByte(::GetACP(), 0, lpWide, -1, NULL, 0, NULL, 0);if (count > 0){lpDst = new char[count + 1];memset(lpDst, 0, count + 1);::WideCharToMultiByte(::GetACP(), 0, lpWide, -1, lpDst, count, NULL, 0);}delete [] lpWide;#endifstrDst = lpDst;delete[] lpDst;return count;}

 

 

MFC版本：

char* p = "abc";CString strW(p);