diff --git a/lib/EasyWin32.cpp b/lib/EasyWin32.cpp
index 6771ffa..f19f2cd 100644
--- a/lib/EasyWin32.cpp
+++ b/lib/EasyWin32.cpp
@@ -2,7 +2,7 @@
 //
 //	EasyWin32.cpp
 //
-//	Ver 3.1.0
+//	Ver 3.1.1
 //
 //
 
@@ -723,8 +723,8 @@ int SetWindowExStyle(long lNewExStyle)
 HICON GetDefaultAppIcon()
 {
 	IMAGE img = GetDefaultIconImage();
-	HBITMAP hBmp = GetImageHBitmap(&img);
-	HICON hIcon = HICONFromHBitmap(hBmp);
+	HBITMAP hBmp = Image2Bitmap(&img);
+	HICON hIcon = Bitmap2Icon(hBmp);
 	DeleteObject(hBmp);
 	return hIcon;
 }
@@ -856,16 +856,17 @@ LRESULT CALLBACK WndProc(HWND hwnd, UINT msg, WPARAM wParam, LPARAM lParam)
 		BOOL repeatFlag = (keyFlags & KF_REPEAT) == KF_REPEAT;        // previous key-state flag, 1 on autorepeat
 		WORD repeatCount = LOWORD(lParam);                            // repeat count, > 0 if several keydown messages was combined into one message
 		BOOL upFlag = (keyFlags & KF_UP) == KF_UP;                    // transition-state flag, 1 on keyup
-
+		
+		// 功能键：不区分左右
 		// if we want to distinguish these keys:
-		switch (vkCode)
-		{
-		case VK_SHIFT:   // converts to VK_LSHIFT or VK_RSHIFT
-		case VK_CONTROL: // converts to VK_LCONTROL or VK_RCONTROL
-		case VK_MENU:    // converts to VK_LMENU or VK_RMENU
-			vkCode = LOWORD(MapVirtualKeyW(scanCode, MAPVK_VSC_TO_VK_EX));
-			break;
-		}
+		//switch (vkCode)
+		//{
+		//case VK_SHIFT:   // converts to VK_LSHIFT or VK_RSHIFT
+		//case VK_CONTROL: // converts to VK_LCONTROL or VK_RCONTROL
+		//case VK_MENU:    // converts to VK_LMENU or VK_RMENU
+		//	vkCode = LOWORD(MapVirtualKeyW(scanCode, MAPVK_VSC_TO_VK_EX));
+		//	break;
+		//}
 
 		ExMessage msgKey = {};
 		msgKey.message = msg;
@@ -877,7 +878,7 @@ LRESULT CALLBACK WndProc(HWND hwnd, UINT msg, WPARAM wParam, LPARAM lParam)
 		g_vecWindows[indexWnd].vecMessage.push_back(msgKey);
 
 		// 给控制台发一份，支持 _getch() 系列函数
-		SendMessage(g_hConsole, msg, wParam, lParam);
+		PostMessage(g_hConsole, msg, wParam, lParam);
 	}
 	break;
 
@@ -890,7 +891,7 @@ LRESULT CALLBACK WndProc(HWND hwnd, UINT msg, WPARAM wParam, LPARAM lParam)
 		g_vecWindows[indexWnd].vecMessage.push_back(msgChar);
 
 		// 通知控制台
-		SendMessage(g_hConsole, msg, wParam, lParam);
+		PostMessage(g_hConsole, msg, wParam, lParam);
 	}
 	break;
 
@@ -1198,23 +1199,29 @@ HWND initgraph_win32(int w, int h, int flag, LPCTSTR strWndTitle, bool(*WindowPr
 	}
 }
 
-
-EASY_WIN32_END
-
 ////////////****** 其他函数 ******////////////
 
-void HpSleep(int ms)
+HBITMAP Image2Bitmap(IMAGE* img)
 {
-	static clock_t oldclock = clock();		// 静态变量，记录上一次 tick
+	return CreateBitmap(img->getwidth(), img->getheight(), 1, 32, (void*)GetImageBuffer(img));
+}
 
-	oldclock += ms * CLOCKS_PER_SEC / 1000;	// 更新 tick
+HICON Bitmap2Icon(HBITMAP hBmp)
+{
+	BITMAP bmp = {};
+	GetObject(hBmp, sizeof(BITMAP), &bmp);
 
-	if (clock() > oldclock)					// 如果已经超时，无需延时
-		oldclock = clock();
-	else
-		while (clock() < oldclock)			// 延时
-			Sleep(1);						// 释放 CPU 控制权，降低 CPU 占用率
-//			Sleep(0);						// 更高精度、更高 CPU 占用率
+	HBITMAP hbmMask = CreateCompatibleBitmap(GetDC(NULL), bmp.bmWidth, bmp.bmHeight);
+
+	ICONINFO ii = { 0 };
+	ii.fIcon = TRUE;
+	ii.hbmColor = hBmp;
+	ii.hbmMask = hbmMask;
+
+	HICON hIcon = CreateIconIndirect(&ii);
+	DeleteObject(hbmMask);
+
+	return hIcon;
 }
 
 void outtextxy_format(int x, int y, int _Size, const wchar_t* _Format, ...)
@@ -1228,25 +1235,19 @@ void outtextxy_format(int x, int y, int _Size, const wchar_t* _Format, ...)
 	delete buf;
 }
 
-HBITMAP GetImageHBitmap(IMAGE* img)
-{
-	return CreateBitmap(img->getwidth(), img->getheight(), 1, 32, (void*)GetImageBuffer(img));
-}
+EASY_WIN32_END
 
-HICON HICONFromHBitmap(HBITMAP hBmp)
+void HpSleep(int ms)
 {
-	BITMAP bmp = {};
-	GetObject(hBmp, sizeof(BITMAP), &bmp);
-
-	HBITMAP hbmMask = CreateCompatibleBitmap(GetDC(NULL), bmp.bmWidth, bmp.bmHeight);
-
-	ICONINFO ii = { 0 };
-	ii.fIcon = TRUE;
-	ii.hbmColor = hBmp;
-	ii.hbmMask = hbmMask;
+	static clock_t oldclock = clock();		// 静态变量，记录上一次 tick
 
-	HICON hIcon = CreateIconIndirect(&ii);
-	DeleteObject(hbmMask);
+	oldclock += ms * CLOCKS_PER_SEC / 1000;	// 更新 tick
 
-	return hIcon;
+	if (clock() > oldclock)					// 如果已经超时，无需延时
+		oldclock = clock();
+	else
+		while (clock() < oldclock)			// 延时
+			Sleep(1);						// 释放 CPU 控制权，降低 CPU 占用率
+//			Sleep(0);						// 更高精度、更高 CPU 占用率
 }
+
diff --git a/lib/EasyWin32.h b/lib/EasyWin32.h
index 98f3443..423a11c 100644
--- a/lib/EasyWin32.h
+++ b/lib/EasyWin32.h
@@ -4,11 +4,11 @@
 //	基于 EasyX 图形库的 Win32 拓展库
 //
 //	作　　者：huidong <mailhuid@163.com>
-//	版　　本：Ver 3.1.0
+//	版　　本：Ver 3.1.1
 //	编译环境：VisualStudio 2022 | EasyX_20220610 | Windows 10 
 //	项目地址：https://github.com/zouhuidong/EasyWin32
 //	创建日期：2020.12.06
-//	最后修改：2022.07.15
+//	最后修改：2022.07.16
 //
 
 #pragma once
@@ -66,6 +66,65 @@ struct EasyWindow
 	int nSkipPixels;						// 绘制时跳过的像素点数量（降质性速绘）
 };
 
+// 鼠标拖动消息
+// 调用方法：
+//	需要在鼠标消息循环中每次都调用 UpdateMessage 更新鼠标消息
+//	调用 isLeftDrag，isMiddleDrag，isRightDrag 函数判断正在拖动的鼠标按键
+//	调用 GetDragX，GetDragY 获取鼠标拖动时鼠标坐标的变化量
+class MouseDrag
+{
+private:
+	ExMessage old, msg;
+	int dx, dy;
+	bool lbtn = false, mbtn = false, rbtn = false;
+	bool newmsg = false;
+
+	bool UpdateDragInfo(bool& btn, int msgid_down, int msgid_up)
+	{
+		if (newmsg)
+		{
+			if (btn)
+			{
+				dx = msg.x - old.x;
+				dy = msg.y - old.y;
+				old = msg;
+				if (msg.message == msgid_up)	btn = false;
+				if (dx != 0 || dy != 0)			return true;
+				else							return false;
+			}
+			else
+			{
+				if (msg.message == msgid_down)
+				{
+					btn = true;
+					old = msg;
+				}
+				return false;
+			}
+			newmsg = false;
+		}
+		else
+		{
+			return false;
+		}
+	}
+
+public:
+
+	void UpdateMessage(ExMessage m)
+	{
+		msg = m;
+		newmsg = true;
+	}
+
+	bool isLeftDrag() { return UpdateDragInfo(lbtn, WM_LBUTTONDOWN, WM_LBUTTONUP); }
+	bool isMiddleDrag() { return UpdateDragInfo(mbtn, WM_MBUTTONDOWN, WM_MBUTTONUP); }
+	bool isRightDrag() { return UpdateDragInfo(rbtn, WM_RBUTTONDOWN, WM_RBUTTONUP); }
+
+	int GetDragX() { return dx; }
+	int GetDragY() { return dy; }
+};
+
 ////////////****** 窗体相关函数 ******////////////
 
 // 创建支持 win32 的绘图窗口（默认支持窗口双击消息）
@@ -241,6 +300,18 @@ MOUSEMSG To_MouseMsg(ExMessage msgEx);
 UINT GetExMessageType(ExMessage msg);
 
 
+////////////****** 图像处理相关函数 ******////////////
+
+// 得到 IMAGE 对象的 HBITMAP
+HBITMAP Image2Bitmap(IMAGE* img);
+
+// HBITMAP 转 HICON
+HICON Bitmap2Icon(HBITMAP hBmp);
+
+// 在屏幕指定位置输出格式化文本
+void outtextxy_format(int x, int y, int _Size, LPCTSTR lpFormat, ...);
+
+
 EASY_WIN32_END
 
 ////////////****** 任务指令宏定义 ******////////////
@@ -321,20 +392,10 @@ EASY_WIN32_END
 
 ////////////****** 其他函数 ******////////////
 
-
 // 精确延时函数(可以精确到 1ms，精度 ±1ms)
 // by yangw80<yw80@qq.com>, 2011-5-4
 void HpSleep(int ms);
 
-// 在屏幕指定位置输出格式化文本
-void outtextxy_format(int x, int y, int _Size, LPCTSTR lpFormat, ...);
-
-// 得到 IMAGE 对象的 HBITMAP
-HBITMAP GetImageHBitmap(IMAGE* img);
-
-// HBITMAP 转 HICON
-HICON HICONFromHBitmap(HBITMAP hBmp);
-
 // 常用色彩扩展
 enum COLORS {
 	DARKBLUE = RGB(0x00, 0x00, 0x8B),