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Difference between a Structure and a Union
...er look at the actual memory values, let's set and print out the values in hex:
union foo x;
x.a = 0xDEADBEEF;
x.b = 0x22;
printf("%x, %x\n", x.a, x.b);
prints
deadbe22, 22
You can clearly see where the 0x22 overwrote the 0xEF.
BUT
In C, the order of bytes in an int are not defined. This pro...
C++特化模板函数的符号多重定义错误问题 - C/C++ - 清泛网 - 专注C/C++及内核技术
...串（char* 指针），因为这个函数比较的是串指针，而不是字符串本身：
LPCTSTR s1,s2;
...
int cmp = compare(s1,s2); // s1<s2? Oops!
为了能进行字符串比较，你需要一个使用 strcmp 或其 TCHAR 版本 _tcscmp 的模板特化：
// specialization for strin...
How can I debug git/git-shell related problems?
...t is not (ch >= 0x20) && (ch < 0x80) as dot .) and no way of hex output for http data.
– kinORnirvana
Oct 6 '16 at 17:44
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Why are these numbers not equal?
...the representation is a bit unwieldy. If we look at them in binary (well, hex, which is equivalent) we get a clearer picture:
sprintf("%a",0.9)
#[1] "0x1.ccccccccccccdp-1"
sprintf("%a",1.1-0.2)
#[1] "0x1.ccccccccccccep-1"
sprintf("%a",1.1-0.2-0.9)
#[1] "0x1p-53"
You can see that they differ by 2...
Encrypt & Decrypt using PyCrypto AES 256
...size)
# Convert the IV to a Python integer.
iv_int = int(binascii.hexlify(iv), 16)
# Create a new Counter object with IV = iv_int.
ctr = Counter.new(AES.block_size * 8, initial_value=iv_int)
# Create AES-CTR cipher.
aes = AES.new(key, AES.MODE_CTR, counter=ctr)
# Enc...
Get Image size WITHOUT loading image into memory
...ER:
name, description, handler = MARKER[i]
# print hex(i), name, description
if handler is not None:
handler(self, i)
if i == 0xFFDA: # start of scan
rawmode = self.mode
if self.mode == "CMYK":
...
Regex exactly n OR m times
...nsider this:
#[a-f0-9]{6}|#[a-f0-9]{3}
This will find all occurences of hex colour codes (they're either 3 or 6 digits long). But when I flip it around like this
#[a-f0-9]{3}|#[a-f0-9]{6}
it will only find the 3 digit ones or the first 3 digits of the 6 digit ones. This does make sense and a ...
How do you create a random string that's suitable for a session ID in PostgreSQL?
...
Note that this returns strings over the "hex digits alphabet" {0..9,a..f} only. May not be sufficient -- depends on what you want to do with them.
– Laryx Decidua
Jul 13 '12 at 13:40
...
git: How to diff changed files versus previous versions after a pull?
...st version of the file" - the commit "ID" (SHA1 hash) is that 40-character hex right at the top of every entry in the output of git log. It's the hash for the entire commit, not for a given file. You don't really ever need more - if you want to diff just one file across the pull, do
git diff HEAD@{...
Android应用开发性能优化完全分析 - 更多技术 - 清泛网 - 专注C/C++及内核技术
...iew缓存等。
尽可能的复用资源；譬如系统本身有很多字符串、颜色、图片、动画、样式以及简单布局等资源可供我们直接使用，我们自己也要尽量复用style等资源达到节约内存。
对于有缓存等存在的应用尽量实现onLowMemor...