GlobalAddAtom

The GlobalAddAtom function adds a character string to the global atom table and returns a unique value (an atom) identifying the string.

ATOM GlobalAddAtom(
  LPCTSTR lpString   // string to add
);

Parameters

lpString

[in] Pointer to the null-terminated string to be added. The string can have a maximum size of 255 bytes. Strings that differ only in case are considered identical. The case of the first string of this name added to the table is preserved and returned by the GlobalGetAtomName function.

Alternatively, you can use an integer atom that has been converted using the MAKEINTATOM macro. See the Remarks for more information.

Return Values

If the function succeeds, the return value is the newly created atom.

If the function fails, the return value is zero. To get extended error information, call GetLastError.

Remarks

If the string already exists in the global atom table, the atom for the existing string is returned and the atom's reference count is incremented.

The string associated with the atom is not deleted from memory until its reference count is zero. For more information, see the GlobalDeleteAtom function.

Global atoms are not deleted automatically when the application terminates. For every call to the GlobalAddAtom function, there must be a corresponding call to the GlobalDeleteAtom function.

If the lpString parameter has the form "#1234", GlobalAddAtom returns an integer atom whose value is the 16-bit representation of the decimal number specified in the string (0x04D2, in this example). If the decimal value specified is 0x0000 or is greater than or equal to 0xC000, the return value is zero, indicating an error. If lpString was created by the MAKEINTATOM macro, the low-order word must be in the range 0x0001 through 0xBFFF. If the low-order word is not in this range, the function fails.

If lpString has any other form, GlobalAddAtom returns a string atom.

Requirements

  Windows NT/2000: Requires Windows NT 3.1 or later.
  Windows 95/98: Requires Windows 95 or later.
  Header: Declared in Winbase.h; include Windows.h.
  Library: Use Kernel32.lib.
  Unicode: Implemented as Unicode and ANSI versions on Windows NT/2000.

See Also

Atoms Overview, Atom Functions, AddAtom, DeleteAtom, FindAtom, GetAtomName, GlobalDeleteAtom, GlobalFindAtom, GlobalGetAtomName, MAKEINTATOM