请教怎么将utf-8转换成Unicode

请问如何将utf-8转换成Unicode
请问如何将utf-8转换成Unicode，这有一个方法，我没弄明白，使用后老死机或者重启：
int32 UTF8ToUnicode(const int8 *szSrc, int32 nSrcLen, wchar_t *strDest, int32 nDestLen)
{
  int32 i=0;
  int32 i_cur_output=0;

  uint8 *pszSrc = (uint8 *)szSrc; /* cast to avoid signed/unsigned promomtion problems */
  while ( i<nSrcLen )
  {
  if ( SIGMASK_3_1 <= pszSrc[i] ) /* 1st byte of 3 byte representation */
  {
  if ( i+2<nSrcLen && i_cur_output+1<nDestLen )
  {
  strDest[i_cur_output++] =(wchar_t)( (wchar_t)pszSrc[i] << 12 | 
  ((wchar_t)pszSrc[i+1] & 0x3f) << 6 | 
  (wchar_t)pszSrc[i+2] & 0x3f);
  i+=3;
  }
  else
  {
  return 0; /* ERROR_INSUFFICIENT_BUFFER */
  }
  }
  else if ( SIGMASK_2_1 <= pszSrc[i] ) /* 1st byte of 2 byte representation */
  {
  if ( i+1<nSrcLen && i_cur_output+1<nDestLen )
  {
  strDest[i_cur_output++] = (wchar_t)(((wchar_t)pszSrc[i] & ~0xc0) << 6 | 
  ((wchar_t)pszSrc[i+1] & ~0x80));
  i+=2;
  }
  else
  {
  return 0; /* ERROR_INSUFFICIENT_BUFFER */
  }
  }
  else /* Single byte representation */
  {
  if ( i<nSrcLen && i_cur_output+1<nDestLen )
  {
  strDest[i_cur_output++] = (wchar_t)pszSrc[i];
  ++i;
  }
  else
  {
  return 0; /* ERROR_INSUFFICIENT_BUFFER */
  }
  }
  }
谢

------解决方案--------------------
不靠谱，windows mobile下用MultibyteToWideChar这个api，跨平台就用iconv库吧，这东西不要自己写