diff --git a/examples/gui/demo_view_dc.c b/examples/gui/demo_view_dc.c
index 233258c2589d821dd65a35206b082c796c0f35e4..c49fde03c875504ebf7f0879817843002c3f8eda 100644
--- a/examples/gui/demo_view_dc.c
+++ b/examples/gui/demo_view_dc.c
@@ -26,8 +26,8 @@ rt_bool_t dc_event_handler(rtgui_widget_t* widget, rtgui_event_t *event)
 	{
 		struct rtgui_dc* dc;
 		rtgui_rect_t rect;
-		rt_uint32_t vx[] = {20, 50, 60, 45, 60, 20};
-		rt_uint32_t vy[] = {150, 50, 90, 60, 45, 50};
+		const int vx[] = {20, 50, 60, 45, 60, 20};
+		const int vy[] = {150, 50, 90, 60, 45, 50};
 
 		/*
 		 * 因为用的是demo view，上面本身有一部分控件，所以在绘图时先要让demo view
diff --git a/examples/gui/demo_view_image.c b/examples/gui/demo_view_image.c
index a98a624aecd25935fae448271be7eb0f02225ecf..dd4f895211aa919b3d9175d85f47d070c0a4e46a 100644
--- a/examples/gui/demo_view_image.c
+++ b/examples/gui/demo_view_image.c
@@ -7,6 +7,7 @@
 #include "demo_view.h"
 #include <rtgui/widgets/button.h>
 #include <rtgui/widgets/filelist_view.h>
+#include <string.h>
 
 static rtgui_image_t* image = RT_NULL;
 static rtgui_view_t* _view = RT_NULL;
diff --git a/examples/gui/demo_view_window.c b/examples/gui/demo_view_window.c
index 8445d1b8ec77a1431891a16de84239f09ab31cb4..0c96f3be54427a70e3e119f955b85eb3a9209a75 100644
--- a/examples/gui/demo_view_window.c
+++ b/examples/gui/demo_view_window.c
@@ -10,6 +10,7 @@
 #include <rtgui/widgets/label.h>
 #include <rtgui/widgets/button.h>
 #include "demo_view.h"
+#include <string.h>
 
 static struct rtgui_timer *timer;
 static struct rtgui_label* label;
@@ -43,7 +44,7 @@ void window_demo_close(struct rtgui_widget* widget, rtgui_event_t *even)
 void diag_close(struct rtgui_timer* timer, void* parameter)
 {
 	cnt --;
-	sprintf(label_text, "closed then %d second!", cnt);
+	rt_sprintf(label_text, "closed then %d second!", cnt);
 
 	/* 设置标签文本并更新控件 */
 	rtgui_label_set_text(label, label_text);
@@ -105,7 +106,7 @@ static void demo_autowin_onbutton(struct rtgui_widget* widget, rtgui_event_t* ev
 	if (msgbox != RT_NULL)
 	{
 		cnt = 5;
-		sprintf(label_text, "closed then %d second!", cnt);
+		rt_sprintf(label_text, "closed then %d second!", cnt);
 		label = rtgui_label_create(label_text);
 		rect.x1 += 5;
 		rect.x2 -= 5;