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【解决】Error 701: Unable to load xxx.xxx - App Inventor 2 中文网 - 清泛IT社区,为创新赋能!

...解决】:连接菜单 -> 重置连接。然后再重新连接一次AI伴侣进行测试,就能解决。 【原理】:在AI伴侣已经连接好之后,访问才刚上传的某资源,就会报这个错误。因为资源不会自动同步到AI伴侣,它必须在AI伴侣连接的时候...
https://www.tsingfun.com/ilife/life/1829.html 

程序员保值的4个秘密 - 杂谈 - 清泛网 - 专注C/C++及内核技术

...搞定。 所以,不要理会“能 Run 就行”、“完成任务就可以了”、“用不到学那么深干什么”之类的话,在你用完一项技术解决了一个实际问题满足了某个需求之后,继续钻进去吧,多学一点,深入一点,日积月累,你必然会...
https://www.tsingfun.com/it/cpp/1252.html 

MFC CListCtrl使用方法详解 - C/C++ - 清泛网 - 专注C/C++及内核技术

... m_list.GetItem(&lvi); 关于得到设置item的状态,还可以参考msdn文章 Q173242: Use Masks to Set/Get Item States in CListCtrl http://support.microsoft.com/kb/173242/en-us 9. 得到listctrl的所有列的header字符串内容 LVCOLUMN lvcol; ...
https://www.tsingfun.com/it/cpp/2213.html 

tcp端口状态ESTABLISHED、TIME_WAIT、CLOSE_WAIT 、SYN_RECV等详解 - C/C++...

...住,只要了解到我上面提到的最常见的三种状态的意义就可以了。一般不到万不得已的情况也不会去查看网络状态,如果服务器出了异常,百分之八九十都是下面两种情况: 1.服务器保持了大量TIME_WAIT状态 2.服务器保持了大量C...
https://stackoverflow.com/ques... 

What's the equivalent of use-commit-times for git?

... no longer modified (Git 2.2.2+, January 2015): "git checkout - how can I maintain timestamps when switching branches?".) The long answer was: I think you're much better off just using multiple repositories instead, if this is something common. Messing with timestamps is not going to work in gen...
https://ullisroboterseite.de/a... 

AI2 SideBar Extension

...d functions can be triggered by a button. With larger apps, however, the available space quickly decreases and the layout becomes confusing. A side bar can help here. There are a number of implementations, but I haven't found a sufficiently extensive one and developed one myself. Almost all proper...
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Finding all possible combinations of numbers to reach a given sum

...tinue for i in range(len(numbers)): n = numbers[i] remaining = numbers[i+1:] subset_sum(remaining, target, partial + [n]) if __name__ == "__main__": subset_sum([3,9,8,4,5,7,10],15) #Outputs: #sum([3, 8, 4])=15 #sum([3, 5, 7])=15 #sum([8, 7])=15 ...
https://bbs.tsingfun.com/thread-1976-1-1.html 

AppInventor2 屏幕如何切换成横屏? - App应用开发 - 清泛IT社区,为创新赋能!

设置Screen1的“屏幕方向”属性即可: 预览如下: ai2Stater测试效果如下: ai2Stater模拟器窗口无法横屏,但是Mumu模拟器及手机AI伴侣测试的话,则会自动横屏。
https://www.tsingfun.com/it/cpp/1512.html 

c++编译错误:invalid new-expression of abstract class type - C/C++ - ...

...不是纯虚函数不作要求。 另外,void fun() { } 空函数也是实现。 纯虚函数相当于C#中abstract抽象类。 =0 说明函数是抽象的方法,谁继承它就必须实现它 否则不能new。 c++ 编译错误 new-expression abstract
https://www.tsingfun.com/it/cpp/1577.html 

MFC OnKeyDown没反应,不响应键盘操作 - C/C++ - 清泛网 - 专注C/C++及内核技术

...了消息映射后, 发现无论按下键盘的哪个键OnKeyDown函数都没有被执行。基于对话框的程序是无法直接响应键盘消息的,需要重载虚函数PreTranslateMessage()。 解决方案(重载PreTranslateMessage函数): virtual BOOL PreTranslateMessage(MSG*...