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Making the iPhone vibrate
...rror for trying to cast from Int to UInt32, but the error reads as "Cannot convert to SystemSoundID", which is confusing. Why didn't apple just make it a Swift enum is beyond me.
@aponomarenko's goes into the details, my answer is just for the Swifters out there.
...
select、poll、epoll之间的区别总结[整理] - C/C++ - 清泛网 - 专注C/C++及内核技术
...在1GB内存的机器上大约是10万左右，具体数目可以cat /proc/sys/fs/file-max察看,一般来说这个数目和系统内存关系很大。
总结：
（1）select，poll实现需要自己不断轮询所有fd集合，直到设备就绪，期间可能要睡眠和唤醒多次交替。而...
Writing to an Excel spreadsheet
...ures and will let you read in excel files as well.
You will first have to convert your data into a DataFrame and then save it into an excel file like so:
In [1]: from pandas import DataFrame
In [2]: l1 = [1,2,3,4]
In [3]: l2 = [1,2,3,4]
In [3]: df = DataFrame({'Stimulus Time': l1, 'Reaction Time':...
Group by with multiple columns using lambda
... Balance = g.Sum(x => Math.Round(Convert.ToDecimal(x.Worth), 2)),
}
);
foreach (var item in CompanyDetails)
{
Console.WriteLine(item.Typ...
How to get a list of user accounts using the command line in MySQL?
...| root | demohost |
| root | 127.0.0.1 |
| debian-sys-maint | localhost |
| | % |
+------------------+-----------+
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Why is address zero used for the null pointer?
... differently at runtime. The C++ standard has a note that makes clear that converting "an integral constant expression with value zero always yields a null pointer, but converting other expressions that happen to have value zero need not yield a null pointer".
a negative value might be just as usabl...
How do I format a number in Java?
...
When you want to convert the rounded value as string, this is one of the way. Other is using DecimalFormat. And DecimalFormat is slightly faster than String.format. Simple System.currentTimeMillis diff reveals that.
– ma...
Can you get the column names from a SqlDataReader?
...numerable<dynamic>> and .Cast<dynamic>, but it says, Cannot convert method group 'Cast' to non-delegate type 'dynamic'. Did you intend to invoke the method? what did I do wrong there? (I looked at your sources, but they required you to know the column name, which I don't)
...
Detecting WPF Validation Errors
...ding Path=(validationScope:Scope.HasErrors),
Converter={local:BoolToBrushConverter},
ElementName=Form}"
BorderThickness="1">
<StackPanel x:Name="Form" validationScope:Scope.ForInputTypes="{x:Static validationScope:InputTyp...
“rm -rf” equivalent for Windows?
...lder /c /G "ADMINNAME":F /T
rmdir /s folder
Works for anything including sys files
EDIT: I actually found the best way which also solves file path too long problem as well:
mkdir \empty
robocopy /mir \empty folder
share...