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App Inventor 2 UrsAI2UDP 拓展 - UDP广播通信协议 · App Inventor 2 中文网
...术应用中或控制设备时，通常需要使用二进制数据。在 4.3 版中，通过 UrsAI2ByteArray 扩展大大简化了二进制数据的发送和接收（另请参阅示例 UDPBinaryTest）。
传输数据报
已经实现了四种不同的方法来发送数据报...
What are the differences between Autotools, Cmake and Scons?
...a modern operating system with nothing really goofy, say Linux or current *BSD, you don't NEED the "rules" there. They, actually, make much, much more work for you and can't help, honestly for cross-compilation. Nearly half of all usages these days are for embedded Linux and *BSD. WHY are you goi...
Is there a command to list SVN conflicts?
... To use this same command on OSX, you need to install GNU grep because the BSD grep doesn't have the perl regex flag (-P)
– G.Rassovsky
Jun 15 '15 at 12:13
4
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Version vs build in Xcode
... Build minor version C, and Build number 139. The next release (presumably 4.3) will likely be Build release 4D, and the Build number will start over at 0 and increment from there.
The iPhone Simulator Version/Build numbers are the same way, as are iPhones, Macs, etc.
3.2: (7W367a)
4.0: (8A400)
4...
How can I exclude all “permission denied” messages from “find”?
...e to lack of permissions is reflected in find's exit code (in both GNU and BSD find): if a permissions-denied error occurs for any of the files processed, the exit code is set to 1.
The following variation addresses that:
find . 2>&1 >files_and_folders | { grep -v 'Permission denied' >...
Generating a SHA-256 hash from the Linux command line
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NOTE: on OS X (BSD), it's echo -n foobar | shasum -a 256
– Olie
Oct 16 '14 at 15:26
6
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Passing arrays as parameters in bash
...ue just now. However, I wanted to point out that on my machine (using bash 4.3.42) the "${!1}" and "${!2}" need to have the quotes removed. If you do not, the value of the original array is read as one string and assigned to argAry1[0] and argAry2[0] respectively, basically meaning the array structu...
How expensive is RTTI?
...e space and typeid(a) == typeid(b) is very fast, on many platforms (Linux, BSD and maybe embedded platforms, but not mingw32). If you know you'll always be on a blessed platform, RTTI is very close to free.
Gritty details:
GCC prefers to use a particular "vendor-neutral" C++ ABI[1], and always use...
What is the most effective way for float and double comparison?
...hich works on both doubles and floats. Given that it is released under the BSD license, using it in your own code should be no problem, as long as you retain the license. I extracted the below code from http://code.google.com/p/googletest/source/browse/trunk/include/gtest/internal/gtest-internal.h h...
Is it safe to ignore the possibility of SHA collisions in practice?
...256 (n=256) and one billion messages (p=109) then the probability is about 4.3*10-60.
A mass-murderer space rock happens about once every 30 million years on average. This leads to a probability of such an event occurring in the next second to about 10-15. That's 45 orders of magnitude more probabl...