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AWTK 需要一个 原生窗口(native_window) 接口来抽象窗口系统。主要用于获取窗口的信息、获取画布和提交绘制结果。在 HarmonyOS NEXT 系统中，我们可以使用下面的代码：

1. 获取窗口信息

static ret_t native_window_harmony_get_info(native_window_t *win, native_window_info_t *info) {system_info_t *s_info = system_info();info->x = 0;info->y = 0;info->w = s_info->lcd_w;info->h = s_info->lcd_h;info->ratio = s_info->device_pixel_ratio;log_debug("ratio=%f %d %d\n", info->ratio, info->w, info->h);return RET_OK;
}

2. 获取画布对象

static canvas_t *native_window_harmony_get_canvas(native_window_t *win) {native_window_harmony_t *harmony = NATIVE_WINDOW_HARMONY(win);return &(harmony->canvas);
}

3. 提交绘制结果

static ret_t native_window_harmony_swap_buffer(native_window_t *win) {native_window_harmony_t *harmony = NATIVE_WINDOW_HARMONY(win);return_value_if_fail(harmony != NULL && harmony->app != NULL, RET_BAD_PARAMS);harmony->app->Flush();return RET_OK;
}## 4. 创建原生窗口```cstatic native_window_t *native_window_harmony_create_internal(AwtkApp *app) {int top = 0;int left = 0;unsigned int width = 0;unsigned int height = 0;float devicePixelRatio = 1;if (s_shared_win != NULL) {TK_OBJECT_REF(s_shared_win);return s_shared_win;}tk_object_t *obj = tk_object_create(&s_native_window_harmony_vtable);native_window_t *win = NATIVE_WINDOW(obj);native_window_harmony_t *harmony = NATIVE_WINDOW_HARMONY(win);canvas_t *c = &(harmony->canvas);return_value_if_fail(harmony != NULL, NULL);win->shared = TRUE;win->vt = &s_native_window_vtable;harmony->app = app;app->GetMetrics(left, top, width, height, devicePixelRatio);width = width / devicePixelRatio;height = height / devicePixelRatio;system_info_set_lcd_w(system_info(), width);system_info_set_lcd_h(system_info(), height);system_info_set_device_pixel_ratio(system_info(), devicePixelRatio);win->rect = rect_init(left, top, width, height);lcd_t *lcd = lcd_harmony_init(win);canvas_init(c, lcd, font_manager());return win;
}

5. 销毁原生窗口

static ret_t native_window_harmony_on_destroy(tk_object_t *obj) {native_window_harmony_t *harmony = NATIVE_WINDOW_HARMONY(obj);lcd_t *lcd = harmony->canvas.lcd;canvas_reset(&(harmony->canvas));lcd_destroy(lcd);return RET_OK;
}