IsCharAlphaNumericA function (winuser.h)

Article
02/09/2023

Determines whether a character is either an alphabetical or a numeric character. This determination is based on the semantics of the language selected by the user during setup or through Control Panel.

Syntax

BOOL IsCharAlphaNumericA(
  [in] CHAR ch
);

Parameters

[in] ch

Type: TCHAR

The character to be tested.

Return value

Type: BOOL

If the character is alphanumeric, the return value is nonzero.

If the character is not alphanumeric, the return value is zero. To get extended error information, call GetLastError.

Remarks

Note

The winuser.h header defines IsCharAlphaNumeric as an alias which automatically selects the ANSI or Unicode version of this function based on the definition of the UNICODE preprocessor constant. Mixing usage of the encoding-neutral alias with code that not encoding-neutral can lead to mismatches that result in compilation or runtime errors. For more information, see Conventions for Function Prototypes.

Requirements

Requirement	Value
Minimum supported client	Windows 2000 Professional [desktop apps only]
Minimum supported server	Windows 2000 Server [desktop apps only]
Target Platform	Windows
Header	winuser.h (include Windows.h)
Library	User32.lib
DLL	User32.dll