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二进制组件使用指导 · App Inventor 2 中文网
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案例二：解析设备回复的一帧
案例三：小数与 4 字节 float 互转
案例四：文本命令与中文
案例五：和电脑上的网络调试助手联调
案例六：收到的字节存成文件，再读回来分包发送
常见问题
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How to concatenate string variables in Bash
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Potherca
9,52944 gold badges5353 silver badges7575 bronze badges
answered Nov 15 '10 at 5:41
codaddictcodaddict
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What's the pythonic way to use getters and setters?
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edited Jan 4 '18 at 19:37
rayryeng
93.3k1919 gold badges154154 silver badges170170 bronze badges
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What is the fastest/most efficient way to find the highest set bit (msb) in an integer in C?
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64
GCC has:
-- Built-in Function: int __builtin_clz (unsigned int x)
Returns the number of l...
How to write a multidimensional array to a text file?
...This (a 2D array) works fine
import numpy as np
x = np.arange(20).reshape((4,5))
np.savetxt('test.txt', x)
While the same thing would fail (with a rather uninformative error: TypeError: float argument required, not numpy.ndarray) for a 3D array:
import numpy as np
x = np.arange(200).reshape((4,5,10...
How do I compare version numbers in Python?
...2.3.1") < version.parse("10.1.2")
True
>>> version.parse("1.3.a4") < version.parse("10.1.2")
True
>>> isinstance(version.parse("1.3.a4"), version.Version)
True
>>> isinstance(version.parse("1.3.xy123"), version.LegacyVersion)
True
>>> version.Version("1.3.xy...
Does PNG contain EXIF data like JPG?
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hippietrail
13k1414 gold badges8484 silver badges125125 bronze badges
answered Mar 6 '12 at 1:38
leonbloyleonbloy
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Move capture in lambda
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Generalized lambda capture in C++14
In C++14 we will have the so called generalized lambda capture. This enables move capture. The following will be legal code in C++14:
using namespace std;
// a unique_ptr is move-only
auto u = make_unique<some_type>...
How to generate keyboard events in Python?
...EDKEY = 0x0001
KEYEVENTF_KEYUP = 0x0002
KEYEVENTF_UNICODE = 0x0004
KEYEVENTF_SCANCODE = 0x0008
MAPVK_VK_TO_VSC = 0
# msdn.microsoft.com/en-us/library/dd375731
VK_TAB = 0x09
VK_MENU = 0x12
# C struct definitions
wintypes.ULONG_PTR = wintypes.WPARAM
class MOUSEINPUT(ctypes.Structure...
How to calculate the SVG Path for an arc (of a circle)
... I draw an arc from 270 degree to 135 degree and one that goes from 270 to 45 degree?
13 Answers
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