UTF8 ANSI 相互转换的函数

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本文介绍了一段用于将ANSI字符串转换为UTF8字符串的C++代码，包括从ANSI到UTF8的转换，从宽字符到UTF8的转换，以及从UTF8到ANSI的转换。

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#include <winnls.h>
#include <malloc.h>
LPCSTR AnsiToUtf8(LPCSTR Ansi)
{
  int WLength = MultiByteToWideChar(CP_ACP, 0, Ansi, -1, NULL, 0);
  LPWSTR pszW = (LPWSTR) _alloca((WLength+1) * sizeof(WCHAR));
  MultiByteToWideChar(CP_ACP, 0, Ansi, -1, pszW, WLength);
  
  int ALength = WideCharToMultiByte(CP_UTF8, 0, pszW, -1, NULL, 0, NULL, NULL);
  LPSTR pszA = (LPSTR)_alloca( ALength + 1);
  WideCharToMultiByte(CP_UTF8, 0, pszW, -1, pszA, ALength, NULL, NULL);  
  pszA[ALength] = 0;
  
  return pszA;
}

LPCSTR WcharToUtf8(LPCWSTR szUnicode)
{
  int ALength = WideCharToMultiByte(CP_UTF8, 0, szUnicode, -1, NULL, 0, NULL, NULL);
  LPSTR pszA = (LPSTR)_alloca( ALength + 1);
  WideCharToMultiByte(CP_UTF8, 0, szUnicode, -1, pszA, ALength, NULL, NULL);  
  pszA[ALength] = 0;
  
  return pszA;
}

LPCSTR Utf8toAnsi( LPCSTR utf8 )
{  
  int WLength = MultiByteToWideChar(CP_UTF8, 0, utf8, -1, NULL, NULL );
  LPWSTR pszW = (LPWSTR) _alloca( (WLength + 1) *sizeof(WCHAR) ) ;    
  MultiByteToWideChar(CP_UTF8, 0, utf8, -1, pszW, WLength );
  pszW[WLength] = 0;
  
  int ALength = WideCharToMultiByte(CP_ACP, 0, pszW, -1, NULL, 0, NULL, NULL);
  LPSTR pszA = ( LPSTR ) _alloca ( ALength + 1 );
  WideCharToMultiByte(CP_ACP, 0, pszW, -1, pszA, ALength, NULL, NULL);
  pszA[ALength] = 0;
  
  return pszA;
}

LPCWSTR Utf8toWchar( LPCSTR utf8 )
{
  int WLength = MultiByteToWideChar(CP_UTF8, 0, utf8, -1, NULL, NULL );
  LPWSTR pszW = (LPWSTR) _alloca( (WLength + 1) *sizeof(WCHAR) ) ;    
  MultiByteToWideChar(CP_UTF8, 0, utf8, -1, pszW, WLength );
  pszW[WLength] = 0;
  return pszW;
}

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