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How to open, read, and write from serial port in C?
...ata from the serial terminal.
By default the received data is displayed as hexadecimal byte values.
To make the program treat the received data as ASCII codes, compile the program with the symbol DISPLAY_STRING, e.g.
cc -DDISPLAY_STRING demo.c
If the received data is ASCII text (rather than binar...
Printf width specifier to maintain precision of floating-point value
...
I recommend @Jens Gustedt hexadecimal solution: use %a.
OP wants “print with maximum precision (or at least to the most significant decimal)”.
A simple example would be to print one seventh as in:
#include <float.h>
int Digs = DECIMAL_DIG...
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...
cpuid汇编指令 - C/C++ - 清泛网 - 专注C/C++及内核技术
...不同的值表示不同的含义（后面有定义），其中EAX中的最低8位（AL）的值表示要得到完整的高速缓存的信息，需要执行EAX=2的CPUID指令的次数（一般都为1，在我这里的数台机器里，还没有为2的），同时，寄存器的最高位（bit 31）...
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
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