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文本框输入十六进制，按字节通过蓝牙发送 · App Inventor 2 中文网
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有用户问：我想把文本框里输入的「ABCD」，以十六进制 0xAB 0xCD 这样的两个字节通过蓝牙发送出去，有什么转换方案吗？
目前蓝牙发送出去的都是 A、B、C、D 四个字母的 ASCII 码。
能实现，不需要拓展。 用到两样现成的东西：...
What is choice_set in this Django app tutorial?
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answered Jan 12 '10 at 12:19
Ben JamesBen James
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What's a 3D doing in this HTML?
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answered Oct 25 '10 at 15:27
Chris Jester-YoungChris Jester-Young
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Why does sed not replace all occurrences?
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edited Apr 6 '13 at 10:03
devnull
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ans...
DirectX SDK (June 2010) Installation Problems: Error Code S1023
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I had the same problem and for me it was because the vc2010 redist x86 was too recent.
Check your temp folder (C:\Users\\AppData\Local\Temp) for the most recent file named
Microsoft Visual C++ 2010 x64 Redistributable Setup_20110608_xxx.html ##
and check if you have the follo...
What's the best way to set a single pixel in an HTML5 canvas?
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var d = id.data; // only do this once per page
d[0] = r;
d[1] = g;
d[2] = b;
d[3] = a;
myContext.putImageData( id, x, y );
Use fillRect() to draw a pixel (there should be no aliasing issues):
ctx.fillStyle = "rgba("+r+","+g+","+b+","+(a/255)+")";
ctx.fillRect...
Determine direct shared object dependencies of a Linux binary?
...ncies as NEEDED sections.
$ readelf -d elfbin
Dynamic section at offset 0xe30 contains 22 entries:
Tag Type Name/Value
0x0000000000000001 (NEEDED) Shared library: [libssl.so.1.0.0]
0x0000000000000001 (NEEDED) Shared library: [libc.so.6]
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Suppress command line output
...dout is file descriptor 1, and stderr is file descriptor 2 by convention. (0 is stdin, incidentally.) The 2>&1 copies output file descriptor 2 from the new value of 1, which was just redirected to the null device.
This syntax is (loosely) borrowed from many Unix shells, but you do have to be...
How do I check for last loop iteration in Django template?
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answered May 7 '09 at 21:59
Paolo BergantinoPaolo Bergantino
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Can you have additional .gitignore per directory within a single repo?
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Similar question was: Are multiple `.gitignore`s frowned on? (Jul 2010)
Or if you can have different version of a .gitignore file per branch: Using github to host public git repositories whilst ensuring that sensitive data files remain untracked (Feb 2010)
Further perhaps related: How do ...