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SQLite 拓展查询数据表，带条件过滤 - App应用开发 - 清泛IT社区，为创新赋能！
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带 where age > 23的条件查询结果如下：
bindParams 是一个列表，在sql中如果有多个变量则需要多个值，比如：
... where age > ? and id < ?
bindParams 就是2个元素组成的列表，对应上面的2个占位符。
显示1小时的倒计时代码怎么做 - App Inventor 2 中文网 - 清泛IT社区，为创新赋能！
参考了显示60秒倒计时步骤，制作了一个程序，倒计时超过1分钟以上，依然是以秒倒计时，看起来倒计时数字很大。现在想实现1小时的倒计时，倒计时显示“时：分：秒”这样的显示方式。
例如：00:59:58 00:59:57 &nb...
手电筒扩展插件大家用起来没？ - App应用开发 - 清泛IT社区，为创新赋能！
...拓展在现在较新版本的安卓手机上已经失效，我们新改了一个版本2.0，已经适配了新版本Android手机，已经测试通过。
下载地址：https://www.fun123.cn/reference/extensions/FlashLight.html
- App Inventor 2 中文网 - 清泛IT社区，为创新赋能！
手动同步用 信息分享器 组件。
自动实时同步只能走云端，上报到你自己的服务器或者微数据库等，另一个 app 定时拉取。
还可以用云数据库接 redis，数据变动有实时通知，不用定时拉取。
Linux: is there a read or recv from socket with timeout?
...tes. It
accepts a timeval structure with the
number of seconds and microseconds
specifying the limit on how long to
wait for an input operation to
complete. If a receive operation has
blocked for this much time without
receiving additional data, it shall
return with a partial count o...
What does -fPIC mean when building a shared library?
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PIC stands for Position Independent Code
and to quote man gcc:
If supported for the target machine, emit position-independent code, suitable for dynamic linking and avoiding any limit on the size of the global offset table. This option ...
Python multiprocessing PicklingError: Can't pickle
...oduce the error with a simpler example, and my code is too complicated to post. If I run the program in IPython shell instead of the regular Python, things work out well.
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Developing cross platform mobile application [closed]
... to developers. There are various mobile platform are available:
Android, iOS, Moblin, Windows mobile 7, RIM, symbian, bada, maemo etc.
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Why does an NSInteger variable have to be cast to long when used as a format argument?
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You get this warning if you compile on OS X (64-bit), because on that platform NSInteger is defined as long and is a 64-bit integer. The %i format, on the other hand, is for int, which is 32-bit. So the format and the actual parameter do not match in size.
Since ...
Checking if a double (or float) is NaN in C++
...y valid and portable way of testing for NaN.
– Adam Rosenfield
Mar 26 '11 at 22:37
7
@Adam: the d...