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

Type: LPTSTR

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.

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.

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