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BLE协议—广播和扫描 - 创客硬件开发 - 清泛IT社区，为创新赋能！
...CLASS = 0x0D, /* 设备简单配对OOB标签（设备类别） */
BLE_AD_TYPE_SM_TK = 0x10, /* 设备安...
Generate GUID in MySQL for existing Data?
...7be25d1d5c2ac6760e179b7fd15 |
| Abeokuta | ab026fa6238e2ab7ee0d76a1351f116f |
| Aberdeen | d85eef763393862e5fe318ca652eb16d |
+------------------------+----------------------------------+
I'm using MySQL Server version: 5.5.40-0+wheezy1 (Debian)
...
How to grep Git commit diffs or contents for a certain word?
...) by Martin Ågren (``).
(Merged by Junio C Hamano -- gitster -- in commit 0d11410, 12 Feb 2020)
diff-options.txt: avoid "regex" overload in example
Reported-by: Adam Dinwoodie
Signed-off-by: Martin Ågren
Reviewed-by: Taylor Blau
When we exemplify the difference between -G and -...
Converting NSString to NSDate (and back again)
...String = @"01-02-2010";
NSDateFormatter *dateFormatter = [[NSDateFormatter alloc] init];
[dateFormatter setDateFormat:@"dd-MM-yyyy"];
NSDate *dateFromString = [dateFormatter dateFromString:dateString];
NSDate convert to NSString:
NSDateFormatter *dateFormatter = [[NSDateFormatter alloc] init];
[d...
“Application tried to present modally an active controller”?
...trollers instantiated like so:
UIViewController* vc1 = [[UIViewController alloc] init];
UIViewController* vc2 = [[UIViewController alloc] init];
UIViewController* vc3 = [[UIViewController alloc] init];
You have added them to a tab bar like this:
UITabBarController* tabBarController = [[UITabBarC...
In C, do braces act as a stack frame?
...[0] here? */
return;
}
(In other words: is the compiler allowed to deallocate d, even if in practice most don't?).
The answer is that the compiler is allowed to deallocate d, and accessing p[0] where the comment indicates is undefined behaviour (the program is not allowed to access the inner ...
How to remove empty cells in UITableView? [duplicate]
...FooterView = UIView()
Objective-C:
tableView.tableFooterView = [[UIView alloc] initWithFrame:CGRectZero];
Because the table thinks there is a footer to show, it doesn't display any cells beyond those you explicitly asked for.
Interface builder pro-tip:
If you are using a xib/Storyboard, you c...
Apache Spark: The number of cores vs. the number of executors
...ably be set to 63 *
1024 = 64512 (megabytes) and 15 respectively. We avoid allocating 100%
of the resources to YARN containers because the node needs some
resources to run the OS and Hadoop daemons. In this case, we leave a
gigabyte and a core for these system processes. Cloudera Manager helps
by ac...
python: how to identify if a variable is an array or a scalar
...stead of np.isscaler(x), as the former will also correctly return true for 0d arrays." A robust forward-compatible alternative to numpy.isscalar() would thus be to trivially wrap numpy.ndim(): e.g., def is_scalar(obj): return np.ndim(obj) == 0
– Cecil Curry
Feb...
Efficient string concatenation in C++
...e a look at this interface:
template <class charT, class traits, class Alloc>
basic_string<charT, traits, Alloc>
operator+(const basic_string<charT, traits, Alloc>& s1,
const basic_string<charT, traits, Alloc>& s2)
You can see that a new object is returne...