Struct cat_engine_basement::windows::core::window_class::WindowClass

pub struct WindowClass;

All window classes that an application registers are unregistered when it terminates.

No window classes registered by a DLL are unregistered when the DLL is unloaded. A DLL must explicitly unregister its classes when it is unloaded.

Before calling WindowClass::unregister, an application must destroy all windows created with the specified class.

Implementations

impl WindowClass

pub const fn new() -> WindowClass

pub unsafe fn register(
    &self,
    class_name: *const u16,
    style: u32,
    window_procedire: Option<unsafe extern "system" fn(_: HWND, _: u32, _: usize, _: isize) -> isize>,
    class_extra_data: i32,
    window_extra_data: i32,
    instance: HINSTANCE,
    window_icon: HICON,
    small_window_icon: HICON,
    cursor: HICON,
    background: HBRUSH,
    menu_name: *const u16
) -> u16

Registers a window class for subsequent use in calls to the Window::create function.

If the function succeeds, the return value is a class atom that uniquely identifies the class being registered. If the function fails, the return value is zero. To get extended error information, call WindowsCore::get_last_error.

pub unsafe fn unregister(&self, name: *const u16, instance: HINSTANCE) -> bool

Unregisters a window class, freeing the memory required for the class.

name is a null-terminated string or a class atom. If name is a string, it specifies the window class name. The atom must be in the low-order word of name; the high-order word must be zero.

If the function succeeds, the return value is true. If the class could not be found or if a window still exists that was created with the class, the return value is false. To get extended error information, call WindowsCore::get_last_error.

pub unsafe fn get_info(
    &self,
    name: *const u16,
    instance: HINSTANCE,
    info: &mut WNDCLASSEXW
) -> bool

Retrieves information about a window class, including a handle to the small icon associated with the window class. The function does not retrieve a handle to the small icon.

name is a null-terminated string or a class atom. If name is a string, it specifies the window class name. The atom must be in the low-order word of name; the high-order word must be zero.

If the function finds a matching class and successfully copies the data, the return value is true. If the function does not find a matching class and successfully copy the data, the return value is flase. To get extended error information, call WindowsCore::get_last_error..