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IOCTL Linux device driver [closed]
...to return the current font or to set the font to a new one.
int ioctl(int fd, int request, ...)
fd is file descriptor, the one returned by open;
request is request code. e.g GETFONT will get the current font from the printer, SETFONT will set the font on the printer;
the third argument is void *...
Passing base64 encoded strings in URL
... from 1 to 3 chars occurs on 3 out of 64 characters on average, so it is a 9% overhead (2*3/64)
– PaulH
Jul 3 '16 at 12:32
...
unix - head AND tail of file
...il. This requires using either the '>( list )' feature of bash (+ /dev/fd/N):
( COMMAND | tee /dev/fd/3 | head ) 3> >( tail )
or using /dev/fd/N (or /dev/stderr) plus subshells with complicated redirection:
( ( seq 1 100 | tee /dev/fd/2 | head 1>&3 ) 2>&1 | tail ) 3>&a...
MFC CString与std::string互转 - C/C++ - 清泛网 - 专注C/C++及内核技术
...cstr);
cstr = CString( stdstr.data() );
Unicode：
stdstr.assign( CT2A ( (LPCTSTR) cstr )); 或者 stdstr = std::string( CT2A ( (LPCTSTR) cstr ));
cstr = CString( stdstr.data() );MFC CString std::string 互转
MFC CString与std::string互转 - VC/MFC - 清泛IT论坛，有思想、有深度
...cstr);
cstr = CString( stdstr.data() );
Unicode：
stdstr.assign( CT2A ( (LPCTSTR) cstr )); 或者 stdstr = std::string( CT2A ( (LPCTSTR) cstr ));
cstr = CString( stdstr.data() );
Most popular screen sizes/resolutions on Android phones [closed]
...p503) web arhive
Top on 2017-01:
Display Resolutions:
1280 x 720: 28.9%
1920 x 1080: 21.4%
800 x 480: 10.3%
854 x 480: 9.7%
960 x 540: 8.9%
1024 x 600: 7.8%
1280 x 800: 5.0%
2560 x 1440: 2.4%
480 x 320: 1.2%
1920 x 1200: 0.8%
1024 x 768: 0.8%
Display Aspect Ratios:
16...
Simulating tremor (from e.g. Parkinson's Disease) with the mouse on a webpage?
...ain loop:
int main()
{
struct input_event event, event_end;
int fd = open("/dev/input/event4", O_RDWR);
long ma = getInteger("Enter max amplitude [points, 0..50]: ", 0, 50);
long ta = getInteger("Enter max wait time [usecs , 0..200000]: ", 0, 200000);
if (fd < 0)
{
...
Forward declaring an enum in C++
...f incomplete types in declarations. Since it is legal to do struct S; void foo(S s); (note that foo is only declared, not defined), then there is no reason why we couldn't do enum E; void foo(E e); as well. In both cases, the size is not needed.
– Luc Touraille
...
Can I change the checkbox size using CSS?
... 1em;
height: 1em;
margin: 0;
border: none;
background-color: #3b88fd;
}
input[type=radio]:checked + label:after{
position: absolute;
content: '';
left: -1.3em;
top: 0;
width: 1em;
height: 1em;
margin: 0;
border: none;
background-color: white;
border-radius: 50%;
tran...
Time complexity of Euclid's Algorithm
..., which makes the analysis easier. You can divide it into cases:
Tiny A: 2a <= b
Tiny B: 2b <= a
Small A: 2a > b but a < b
Small B: 2b > a but b < a
Equal: a == b
Now we'll show that every single case decreases the total a+b by at least a quarter:
Tiny A: b % (a % b) < a a...