GetClassName function (winuser.h)

Retrieves the name of the class to which the specified window belongs.


int GetClassName(
  [in]  HWND   hWnd,
  [out] LPTSTR lpClassName,
  [in]  int    nMaxCount


[in] hWnd

Type: HWND

A handle to the window and, indirectly, the class to which the window belongs.

[out] lpClassName


The class name string.

[in] nMaxCount

Type: int

The length of the lpClassName buffer, in characters. The buffer must be large enough to include the terminating null character; otherwise, the class name string is truncated to nMaxCount-1 characters.

Return value

Type: int

If the function succeeds, the return value is the number of characters copied to the buffer, not including the terminating null character.

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


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
API set ext-ms-win-ntuser-windowclass-l1-1-0 (introduced in Windows 8)

See also

FindWindowA function, GetClassInfoA function, GetClassLongA function, GetClassWord function, Window Classes