GDI+自绘按钮，无窗口句柄
#pragma once#include "stdafx.h"enum btn_state{nomal,down,up,over};#define WM_BTN_UP WM_USER+1#define WM_BTN_DOWN WM_USER+2#define WM_BTN_MOVE WM_USER+3class CUS_BTN{public: CU
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