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AppInventor2画布拖动事件中 起点、前点、当前点,都是啥意思? - App应用...

Q:AppInventor2画布拖动事件中 起点、前点、当前点,都是啥意思? A: 起点:第一次触摸屏幕的位置。 前点:最后一次拖动前的位置。 当前点:当前拖动后最新的位置。 详见中文文档:https://www.fun123.cn/reference/ ... html#Canvas...
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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!

Error 701: Unable to load xxx.xxx 比如: 【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...
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C#科学计数法转换decimal出错 - .NET(C#) - 清泛IT社区,为创新赋能!

decimal scientific = decimal.Parse("2.1021E-05") 执行发生异常:“未经处理的异常:  System.FormatException: 输入字符串的格式不正确。” 解决方法: decimal  scientific = decimal.Parse("2.1021E-05", System.Globalization.NumberS...
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2025年9月14日签到记录贴 - 签到区 - 清泛IT社区,为创新赋能!

本贴是论坛每日签到系统在每天的第一位签到者签到时所自动生成的,如果您还未签到,请点此进行签到的操作. 我在 2025-09-14 07:41 完成签到,是今天第一个签到的用户,获得随机奖励 小红花 14,另外我还额外获得了 小红花 10.我今天...
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comparing 2 strings alphabetically for sorting purposes

...erBool ? 1 : -1; }); Note: Be careful for upper letters, you may need to cast your string to lower case due to your purpose. share | improve this answer | follow ...
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/data/user/0/xxxx/files(内部存储)和 /storage/emulated/0/Android/data...

来源:DeepSeek回答结果。 在 Android 中,/data/user/0/xxxx/files(内部存储)和 /storage/emulated/0/Android/data/xxxx/files(外部存储的私有目录)都是应用的私有存储空间,但它们在存储位置、访问方式、权限要求等方面有显著区别。以下...
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Fastest way to convert Image to Byte array

... Unable to cast object of type 'System.Byte[]' to type 'System.Drawing.Image'. – user123 Jun 18 '14 at 12:26 ad...
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What exactly do “u” and “r” string flags do, and what are raw string literals?

...by calling unicode('text') So u is just a short way to call a function to cast str to unicode. That's it! Now the r part, you put it in front of the text to tell the computer that the text is raw text, backslash should not be an escaping character. r'\n' will not create a new line character. It's ...
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Is Meyers' implementation of the Singleton pattern thread safe?

.../ call placement new on s to construct it } return (*(reinterpret_cast<Singleton*>( &s))); } So here's a simple thread-safe Singleton (for Windows). It uses a simple class wrapper for the Windows CRITICAL_SECTION object so that we can have the compiler automatically initialize ...
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Are there any disadvantages to always using nvarchar(MAX)?

...ost everything, from index to delete, update and inserts. " http://sqlblogcasts.com/blogs/simons/archive/2006/02/28/Why-use-anything-but-varchar_2800_max_2900_.aspx Integration implications - hard for other systems to know how to integrate with your database Unpredictable growth of data Possible s...