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App Inventor 2 蓝牙BLE扩展源码分析 - WriteBytes vs WriteStrings 23字节...
...写入路径
位于 BLEWriteOperation.write() 方法第678-690行：
if (mClass == String.class) {
byte[] str = ((String) data.get(0)).getBytes();
// ↓ 23字节硬限制！
final int len = Math.min(23, str.length + (null...
Erlang's 99.9999999% (nine nines) reliability
Erlang was reported to have been used in production systems for over 20 years with an uptime percentage of 99.9999999%.
4 ...
Change color of PNG image via CSS?
... and filter:
Filters are relatively new to browsers but supported in over 90% of browsers according to the following CanIUse table: https://caniuse.com/#feat=css-filters
You can change an image to grayscale, sepia and lot more (look at the example).
So you can now change the color of a PNG file w...
How to return smart pointers (shared_ptr), by reference or by value?
...Unfortunately, this approach is far from ideal.
The code grew by 150%
We’ve had to drop const-ness because we’re mutating names.
As functional programmers like to remind us, mutation makes code more complex to reason about by undermining referential transparency and equational reason...
Understand convertRect:toView:, convertRect:FromView:, convertPoint:toView: and convertPoint:fromVie
...
Each view has its own coordinate system - with an origin at 0,0 and a width and height. This is described in the bounds rectangle of the view. The frame of the view, however, will have its origin at the point within the bounds rectangle of its superview.
The outermost view of your v...
What's the difference between hard and soft floating point numbers?
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100
Hard floats use an on-chip floating point unit. Soft floats emulate one in software. The differ...
@RequestBody and @ResponseBody annotations in Spring
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220
There is a whole Section in the docs called 16.3.3.4 Mapping the request body with the @RequestB...
Submitting HTML form using Jquery AJAX
...u.
– mahendra kawde
Oct 6 '15 at 13:01
1
can we avoid using form post at all and simply do jquery...
Android Webview - Webpage should fit the device screen
...calculate the scale that you need to use manually, rather than setting to 30.
private int getScale(){
Display display = ((WindowManager) getSystemService(Context.WINDOW_SERVICE)).getDefaultDisplay();
int width = display.getWidth();
Double val = new Double(width)/new Double(PIC_WIDTH);...
What is the difference between “Rollback…” and “Back Out Submitted Changelist #####” in Perforce P4V
...
answered May 5 '10 at 19:35
ravenraven
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