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How to parse a string to an int in C++?
...her bases by setting the stream to the correct mode (e.g. ss << std::hex) before trying the conversion. But this means the caller must know a priori what base the number is -- and how can the caller possibly know that? The caller doesn't know what the number is yet. They don't even know that i...
How can I save my secret keys and password securely in my version control system?
...er_openssl script:
#!/bin/bash
SALT_FIXED=<your-salt> # 24 or less hex characters
PASS_FIXED=<your-passphrase>
openssl enc -base64 -aes-256-ecb -S $SALT_FIXED -k $PASS_FIXED
Similar for smudge_filter_open_ssl and diff_filter_oepnssl. See Gist.
Your repo with sensitive information s...
.rar, .zip files MIME Type
...x00
// http://en.wikipedia.org/wiki/RAR
if ($ext == '.rar' and bin2hex($bytes) == '526172211a0700') {
return TRUE;
}
// ZIP magic number: none, though PK\003\004, PK\005\006 (empty archive),
// or PK\007\008 (spanned archive) are common.
// http://en.wikipedia.org/w...
WheelView 拓展：滚轮选择框扩展，滚轮日历选择框和旋转日历扩展 · App In...
...
WheelView 与数字选择框类似，但滚轮内容可以是任意字符串。
原始代码来自 WheelView：效果类似 Android 4.0 以上原生的 DatePicker。
感谢 @wildcontrol 赞助本扩展。
演示图片（示例共用到 3 个扩展）：
Download link here;
aix拓展
...
App Inventor 2 中文网原创内容 · App Inventor 2 中文网
...程
【文件查找】App Inventor 2 查找手机上的文件教程
【字符串操作】App Inventor 2 字符串拆分/截取/替换教程
【浮点数字节】App Inventor 2 浮点数与字节转换教程
【文本加密】App Inventor 2 文本加密解密教程
【高频定时】App Inv...
bpftrace教程【官方】 - 操作系统(内核) - 清泛网 - 专注C/C++及内核技术
...s->filename用来获取args的成员变量filename的值。
str()用来把字符串指针转换成字符串。
4. 进程的系统调用记数统计
bpftrace -e 'tracepoint:raw_syscalls:sys_enter { @[comm] = count(); }'
Attaching 1 probe...
^C
@[bpftrace]: 6
@[systemd]: 24
@[snmp-pass...
What's the difference between ASCII and Unicode?
...II tables show character codes as 0-127 but UTF-8 tables show the codes as hex and not integers. Is there a reason for this? Why don't UTF-X tables show 0-127/255/65535 versus 00-AF? Does this mean anything?
– wayofthefuture
Jun 16 '17 at 16:31
...
Control the size of points in an R scatterplot?
...2 has several alternative ways to make that look nice - alpha adjustments, hex bins, contour plots, etc. Check out pages 72-77 of the ggplot2 book, if there's one in your library or if your library has electronic access to Springer books (I think most of the R books are in there).
...
Sprintf equivalent in Java
...late printf, but in a different way.
For instance, to convert a value to a hex string, you have the 2 following solutions:
with format(), closest to sprintf():
final static String HexChars = "0123456789abcdef";
public static String getHexQuad(long v) {
String ret;
if(v > 0xffff) ret =...
parseInt vs unary plus, when to use which?
...t of @Alex K., parseInt and parseFloat will parse by character. This means hex and exponent notations will fail since the x and e are treated as non-numerical components (at least on base10).
The unary + will convert them properly though.
parseInt('2e3',10) === 2; //true. This is supposed to be 2...