mfc字符转码

std::wstring UTF8ToUnicode(const std::string& utf8string)

 1 {
 2  int widesize = ::MultiByteToWideChar(CP_UTF8, 0, utf8string.c_str(), -1, NULL, 0);
 3  if (widesize == ERROR_NO_UNICODE_TRANSLATION)
 4  {
 5   throw std::exception("Invalid UTF-8 sequence.");
 6  }
 7  if (widesize == 0)
 8  {
 9   throw std::exception("Error in conversion.");
10  }
11  std::vector<wchar_t> resultstring(widesize);
12  int convresult = ::MultiByteToWideChar(CP_UTF8, 0, utf8string.c_str(), -1, &resultstring[0], widesize);
13  if (convresult != widesize)
14  {
15   throw std::exception("La falla!");
16  }
17  return std::wstring(&resultstring[0]);
18 }

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std::string WideByteToAcsi(std::wstring& wstrcode)

 1 {
 2  int asciisize = ::WideCharToMultiByte(CP_OEMCP, 0, wstrcode.c_str(), -1, NULL, 0, NULL, NULL);
 3  if (asciisize == ERROR_NO_UNICODE_TRANSLATION)
 4  {
 5   throw std::exception("Invalid UTF-8 sequence.");
 6  }
 7  if (asciisize == 0)
 8  {
 9   throw std::exception("Error in conversion.");
10  }
11  std::vector<char> resultstring(asciisize);
12  int convresult = ::WideCharToMultiByte(CP_OEMCP, 0, wstrcode.c_str(), -1, &resultstring[0], asciisize, NULL, NULL);
13  if (convresult != asciisize)
14  {
15   throw std::exception("La falla!");
16  }
17  return std::string(&resultstring[0]);
18 }

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std::string UTF8ToASCII(std::string& strUtf8Code)

{
 std::string strRet("");
 //先把 utf8 转为 unicode   
 std::wstring wstr = UTF8ToUnicode(strUtf8Code);
 //最后把 unicode 转为 ascii   
 strRet = WideByteToAcsi(wstr);
 return strRet;
}

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std::string ASCIIToUTF8(std::string& strASCIICode)

 1 {
 2  std::string strOutUTF8 = "";
 3  WCHAR * str1;
 4  int n = MultiByteToWideChar(CP_ACP, 0, strASCIICode.c_str(), -1, NULL, 0);
 5  str1 = new WCHAR[n];
 6  MultiByteToWideChar(CP_ACP, 0, strASCIICode.c_str(), -1, str1, n);
 7  n = WideCharToMultiByte(CP_UTF8, 0, str1, -1, NULL, 0, NULL, NULL);
 8  char * str2 = new char[n];
 9  WideCharToMultiByte(CP_UTF8, 0, str1, -1, str2, n, NULL, NULL);
10  strOutUTF8 = str2;
11  delete[]str1;
12  str1 = NULL;
13  delete[]str2;
14  str2 = NULL;
15  return strOutUTF8;
16 }

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//!!为了减少字符串的拷贝，改为使用shared_array，性能升级

#include <boost/shared_array.hpp>

#define CHAR_EMPTY_ARR_PTR boost::shared_array<char>(new char[1]{''})
#define WCHAR_EMPTY_ARR_PTR boost::shared_array<wchar_t>(new wchar_t[1]{L''})

boost::shared_array<char> UTF8ToASCII(std::string& strUtf8Code)

1 {
2  return std::move(UTF8ToASCII(strUtf8Code.c_str()));
3 }

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boost::shared_array<char> UTF8ToASCII(const char* ch, int nLen /*= -1*/)

1 {
2  //先把 utf8 转为 unicode   
3  auto wstr = UTF8ToUnicode(ch, nLen);
4  //最后把 unicode 转为 ascii   
5  return std::move(WideByteToAcsi(wstr.get()));
6 }

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boost::shared_array<char> ASCIIToUTF8(std::string& strASCIICode)

1 {
2  return std::move(ASCIIToUTF8(strASCIICode.c_str()));
3 }

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boost::shared_array<char> ASCIIToUTF8(const char* ch, int nLen/* = -1*/)

 1 {
 2  int n = MultiByteToWideChar(CP_ACP, 0, ch, nLen, NULL, 0);
 3  if (0 == n)
 4  {
 5   return CHAR_EMPTY_ARR_PTR;
 6  }
 7  boost::shared_array<wchar_t> ptrWtArr(new wchar_t[n]{ L'' });
 8  if (0 == MultiByteToWideChar(CP_ACP, 0, ch, nLen, ptrWtArr.get(), n))
 9  {
10   return CHAR_EMPTY_ARR_PTR;
11  }
12  n = WideCharToMultiByte(CP_UTF8, 0, ptrWtArr.get(), -1, NULL, 0, NULL, NULL);
13  if (0 == n)
14  {
15   return CHAR_EMPTY_ARR_PTR;
16  }
17  boost::shared_array<char> ptrArr(new char[n]{ '' });
18  if (0 == WideCharToMultiByte(CP_UTF8, 0, ptrWtArr.get(), -1, ptrArr.get(), n, NULL, NULL))
19  {
20   return CHAR_EMPTY_ARR_PTR;
21  }
22  return std::move(ptrArr);
23 }

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boost::shared_array<wchar_t> UTF8ToUnicode(const char* ch, int nLen /*= -1*/)

 1 {
 2  int widesize = ::MultiByteToWideChar(CP_UTF8, 0, ch, nLen, NULL, 0);
 3  if (0 == widesize)
 4  {
 5   return WCHAR_EMPTY_ARR_PTR;
 6  }
 7  boost::shared_array<wchar_t> ptrWtArr(new wchar_t[widesize]{ L'' });
 8  int convresult = ::MultiByteToWideChar(CP_UTF8, 0, ch, nLen, ptrWtArr.get(), widesize);
 9  if (0 == convresult)
10  {
11   return WCHAR_EMPTY_ARR_PTR;
12  }
13  return std::move(ptrWtArr);
14 }
15 boost::shared_array<char> DPC::WideByteToAcsi(std::wstring& wstrcode)
16 {
17  return std::move(WideByteToAcsi(wstrcode.c_str()));
18 }

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boost::shared_array<char> WideByteToAcsi(const wchar_t* wch, int nLen /*= -1*/)

 1 {
 2  int asciisize = ::WideCharToMultiByte(CP_OEMCP, 0, wch, nLen, NULL, 0, NULL, NULL);
 3  if (0 == asciisize)
 4  {
 5   return CHAR_EMPTY_ARR_PTR;
 6  }
 7  boost::shared_array<char> ptrArr(new char[asciisize + 1]{''});
 8  int convresult = ::WideCharToMultiByte(CP_OEMCP, 0, wch, nLen, ptrArr.get(), asciisize, NULL, NULL);
 9  if (0 == convresult)
10  {
11   return CHAR_EMPTY_ARR_PTR;
12  }
13  return std::move(ptrArr);
14 }

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