Fix: fix null pointer in examples

[wangwenx190]

How could menu be null?

[KangLin]

YES. you are return before instance menu.

At 2024-01-30 09:54:31, "Yuhang Zhao" @.***> wrote:

How could menu be null?

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[wangwenx190]

I don't think so. If we are accessing a null pointer, we would experience a crash already, but that didn't happen.

[KangLin]

https://github.com/stdware/qwindowkit/blob/03605a234142933dc49f1a6b2fbf49ba007d87f8/examples/mainwindow/mainwindow.cpp#L122

在这里加上 return;

[KangLin]

简单的说，你没有考虑异常情况。

[wangwenx190]

这个“异常情况”本不存在，是你非要加return造成的。可以看出你是在本地测试一些东西，那么你在本地修改就好了，不需要提交到这个仓库。