If this parameter is NULL, all window names match. For more information, see the Remarks section of this topic. In this latter case, 0x8000 is the atom for a menu class. The class name can be any name registered with RegisterClass or RegisterClassEx, or any of the predefined control-class names, or it can be MAKEINTATOM(0x8000). If lpszClass is a string, it specifies the window class name. The atom must be placed in the low-order word of lpszClass the high-order word must be zero.

The class name or a class atom created by a previous call to the RegisterClass or RegisterClassEx function. Note that if both hwndParent and hwndChildAfter are NULL, the function searches all top-level and message-only windows.

If hwndChildAfter is NULL, the search begins with the first child window of hwndParent. The child window must be a direct child window of hwndParent, not just a descendant window. The search begins with the next child window in the Z order. param hWndChildAfter Ī handle to a child window. If hwndParent is HWND_MESSAGE, the function searches all message-only windows.

The function searches among windows that are child windows of the desktop. If hwndParent is NULL, the function uses the desktop window as the parent window. parameters -param hWndParent Ī handle to the parent window whose child windows are to be searched. This function does not perform a case-sensitive search. The function searches child windows, beginning with the one following the specified child window. Retrieves a handle to a window whose class name and window name match the specified strings. Ext-ms-win-ntuser-window-l1-1-1 (introduced in Windows 8.1)

Getwindowtext windows api reference