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【转】用App Inventor 2实现电子围栏功能 - App应用开发 - 清泛IT社区，为创新赋能！
...taining the northwest and southeast coordinates of the current view in the form ((North West) (South East)).设置或获取地图的边界，值是一个包含了西北和东南坐标的嵌套列表，格式为((北西)(南东))CenterFromString地图中心Set the initial center coordinate of the map...
Passing variable number of arguments around
... va_list and use that va_list in your second function. Specifically;
void format_string(char *fmt,va_list argptr, char *formatted_string);
void debug_print(int dbg_lvl, char *fmt, ...)
{
char formatted_string[MAX_FMT_SIZE];
va_list argptr;
va_start(argptr,fmt);
format_string(fmt, argptr...
How to change an element's title attribute using jQuery
I have an form input element and want to change its title attribute. This has to be easy as pie, but for some reason I cannot find how to do this. How is this done, and where and how should I be searching on how to do this?
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Best architectural approaches for building iOS networking applications (REST clients)
... forget about the persistence (it can significantly increase your app's performance). You can use Core Data for this. But you should not forget, that Core Data is not an ORM or a database, but an object graph manager with persistence as a good option of it. So, very often Core Data can be too heavy ...
How does StartCoroutine / yield return pattern really work in Unity?
...oss iterations, as well as a means of tracking which iteration is to be performed next. That’s not usually too bad – the design of an ‘A* pathfinder class’ is fairly obvious – but there are other cases, too, that are less pleasant. Sometimes you’ll be facing long computations that are do...
Download file of any type in Asp.Net MVC using FileResult?
...tFileFromDisk(string fileName)
{
return File(directoryPath, "multipart/form-data", fileName);
}
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How to insert a newline in front of a pattern?
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In general, for $ followed by a string literal in single quotes bash performs C-style backslash substitution, e.g. $'\t' is translated to a literal tab. Plus, sed wants your newline literal to be escaped with a backslash, hence the \ before $. And finally, the dollar sign itself shouldn't be quot...
C# switch on type [duplicate]
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This should be a very efficient/performant solution. Just note that this won't work with subclasses.
– sparebytes
Sep 10 '13 at 20:04
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A Space between Inline-Block List Items [duplicate]
...you please update your answer so that you aren't giving people incorrect information? A 4px margin is not added to inline-block elements. As Anzeo mentions, it is due to a space being rendered between elements. The word 'margin' has specific meaning in CSS and it can mislead others into not understa...
Check whether an input string contains a number in javascript
...() gives true if the passed value is a finite number and number 5,000 is a formatted string of number not a finite number.
– Starx
Nov 16 '15 at 19:41
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