画机器猫与随机矩形两讲的问题
画机器猫那节发现机器猫腋下的线条不对称，而数据是对称绘制的，小甲鱼与我自己写的程序都是这样：绘制随机矩形那一节，在switch语句中加入WM_PAINT消息，程序就会出错，不知道是什么原因
随机矩形代码贴出来看看，哆啦A梦那个情况，只要跟着小甲鱼视频做的，都有这个情况出现，解决方法，把画笔改成1，左边只画一条，右边画两条（一条长一条短）。
具体代码实现：把你的如下代码hOldPen = (HPEN)SelectObject(hdc, CreatePen(PS_SOLID, 2, RGB(0, 159, 232)));
MoveToEx(hdc, (cxClient / 2) - 90, (cyClient / 2) + 10, NULL);
LineTo(hdc, (cxClient / 2) - 90, (cyClient / 2) + 50);
MoveToEx(hdc, (cxClient / 2) + 90, (cyClient / 2) + 10, NULL);
LineTo(hdc, (cxClient / 2) + 90, (cyClient / 2) + 50);
替换成hOldPen = (HPEN)SelectObject(hdc, CreatePen(PS_SOLID, 1, RGB(0, 159, 232)));
MoveToEx(hdc, (cxClient / 2) - 90, (cyClient / 2) + 50, NULL);
LineTo(hdc, (cxClient / 2) - 90, (cyClient / 2) + 10);
MoveToEx(hdc, (cxClient / 2) + 90, (cyClient / 2) + 60, NULL);
LineTo(hdc, (cxClient / 2) + 90, (cyClient / 2) + 10);
MoveToEx(hdc, (cxClient / 2) + 89, (cyClient / 2) + 50, NULL);
LineTo(hdc, (cxClient / 2) + 89, (cyClient / 2) + 10);
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