理解Hungarian notation

• Hungarian notation

  Hungarian notation is an identifier naming convention in computer programming, in which the name of a variable or function indicates its intention or kind, and in some dialects its type.

  The original Hungarian Notation is sometimes called Apps Hungarian as it became popular in the Microsoft Apps division in the development of Word, Excel and other apps.

• History

  The original Hungarian notation, which would now be called Apps Hungarian, was invented by Charles Simonyi, a programmer who worked at Xerox PARC circa 1972-1981, and who later became Chief Architect at Microsoft.

  PARC(Palo Alto Research Center, formerly Xerox PARC) is a research and development company in Palo Alto, Califonia. Formed in 1969.

• Coding Style Concentions From Microsoft

  From Microsoft, Hungarian Notation has become a common coding practice in Win32 programming. They include variable prefix notations that give to variable names a suggestion of the type of the variable.

  The following table lists common prefixes:

  Prefix	Description
  a	Array
  b	BOOL (int)
  c	Char
  cb	Count of bytes
  cr	Color reference value
  cx	Count of x (short)
  dw	DWORD (unsigned long)
  f	Flags (usually multiple bit values)
  fn	Function
  g_	Global
  h	Handle
  i	Integer
  l	Long
  lp	Long pointer
  m_	Data member of a class
  n	Short int
  p	Pointer
  s	String
  sz	Zero terminated String
  tm	Text metric
  u	Unsigned int
  ul	Unsigned long (ULONG)
  w	WORD (unsigned short)
  x,y	x, y coordinates (short)

  Much more information could be found here.

• Refrecences

1. StackOverflow Tag: Hungarian notation
2. Good Examples of Hungarian Notation? [closed]
3. .NET General Naming Conventions
4. Making Wrong Code Look Wrong
5. Why shouldn’t I use “Hungarian Notation”?