$ libcamera-hello --help
Valid options are:
-h [ --help ] [=arg(=1)] (=0) Print this help message
--version [=arg(=1)] (=0) Displays the build version number
--list-cameras [=arg(=1)] (=0) Lists the available cameras attached to the system.
--camera arg (=0) Chooses the camera to use. To list the available indexes, use the
--list-cameras option.
-v [ --verbose ] [=arg(=2)] (=1) Set verbosity level. Level 0 is no output, 1 is default, 2 is verbose.
-c [ --config ] [=arg(=config.txt)] Read the options from a file. If no filename is specified, default to
config.txt. In case of duplicate options, the ones provided on the command line
will be used. Note that the config file must only contain the long form
options.
--info-text arg (=#%frame (%fps fps) exp %exp ag %ag dg %dg)
Sets the information string on the titlebar. Available values:
%frame (frame number)
%fps (framerate)
%exp (shutter speed)
%ag (analogue gain)
%dg (digital gain)
%rg (red colour gain)
%bg (blue colour gain)
%focus (focus FoM value)
%aelock (AE locked status)
%lp (lens position, if known)
%afstate (AF state, if supported)
--width arg (=0) Set the output image width (0 = use default value)
--height arg (=0) Set the output image height (0 = use default value)
-t [ --timeout ] arg (=5000) Time (in ms) for which program runs
-o [ --output ] arg Set the output file name
--post-process-file arg Set the file name for configuring the post-processing
--rawfull [=arg(=1)] (=0) Force use of full resolution raw frames
-n [ --nopreview ] [=arg(=1)] (=0) Do not show a preview window
-p [ --preview ] arg (=0,0,0,0) Set the preview window dimensions, given as x,y,width,height e.g. 0,0,640,480
-f [ --fullscreen ] [=arg(=1)] (=0) Use a fullscreen preview window
--qt-preview [=arg(=1)] (=0) Use Qt-based preview window (WARNING: causes heavy CPU load, fullscreen not
supported)
--hflip [=arg(=1)] (=0) Request a horizontal flip transform
--vflip [=arg(=1)] (=0) Request a vertical flip transform
--rotation arg (=0) Request an image rotation, 0 or 180
--roi arg (=0,0,0,0) Set region of interest (digital zoom) e.g. 0.25,0.25,0.5,0.5
--shutter arg (=0) Set a fixed shutter speed in microseconds
--analoggain arg (=0) Set a fixed gain value (synonym for 'gain' option)
--gain arg Set a fixed gain value
--metering arg (=centre) Set the metering mode (centre, spot, average, custom)
--exposure arg (=normal) Set the exposure mode (normal, sport)
--ev arg (=0) Set the EV exposure compensation, where 0 = no change
--awb arg (=auto) Set the AWB mode (auto, incandescent, tungsten, fluorescent, indoor, daylight,
cloudy, custom)
--awbgains arg (=0,0) Set explict red and blue gains (disable the automatic AWB algorithm)
--flush [=arg(=1)] (=0) Flush output data as soon as possible
--wrap arg (=0) When writing multiple output files, reset the counter when it reaches this
number
--brightness arg (=0) Adjust the brightness of the output images, in the range -1.0 to 1.0
--contrast arg (=1) Adjust the contrast of the output image, where 1.0 = normal contrast
--saturation arg (=1) Adjust the colour saturation of the output, where 1.0 = normal and 0.0 =
greyscale
--sharpness arg (=1) Adjust the sharpness of the output image, where 1.0 = normal sharpening
--framerate arg (=-1) Set the fixed framerate for preview and video modes
--denoise arg (=auto) Sets the Denoise operating mode: auto, off, cdn_off, cdn_fast, cdn_hq
--viewfinder-width arg (=0) Width of viewfinder frames from the camera (distinct from the preview window
size
--viewfinder-height arg (=0) Height of viewfinder frames from the camera (distinct from the preview window
size)
--tuning-file arg (=-) Name of camera tuning file to use, omit this option for libcamera default
behaviour
--lores-width arg (=0) Width of low resolution frames (use 0 to omit low resolution stream
--lores-height arg (=0) Height of low resolution frames (use 0 to omit low resolution stream
--mode arg Camera mode as W:H:bit-depth:packing, where packing is P (packed) or U
(unpacked)
--viewfinder-mode arg Camera mode for preview as W:H:bit-depth:packing, where packing is P (packed)
or U (unpacked)
--buffer-count arg (=0) Number of in-flight requests (and buffers) configured for video, raw, and
still.
--viewfinder-buffer-count arg (=0) Number of in-flight requests (and buffers) configured for preview window.
--autofocus-mode arg (=default) Control to set the mode of the AF (autofocus) algorithm.(manual, auto,
continuous)
--autofocus-range arg (=normal) Set the range of focus distances that is scanned.(normal, macro, full)
--autofocus-speed arg (=normal) Control that determines whether the AF algorithm is to move the lens as quickly
as possible or more steadily.(normal, fast)
--autofocus-window arg (=0,0,0,0) Sets AfMetering to AfMeteringWindows an set region used, e.g.
0.25,0.25,0.5,0.5
--lens-position arg Set the lens to a particular focus position, expressed as a reciprocal distance
(0 moves the lens to infinity), or "default" for the hyperfocal distance
--hdr [=arg(=1)] (=0) Enable (1) or disable (0) High Dynamic Range, where supported
--metadata arg Save captured image metadata to a file or "-" for stdout
--metadata-format arg (=json) Format to save the metadata in, either txt or json (requires --metadata)
2.3.2 libcamera-vid
视频采集
编码：--codec h264
配置：--profile main
级别：--level 4
码流：-b 150000000
帧率：--framerate 30
宽高：--width 1920 --height 1080
延时：-t 0
强制：--inline
输出：-o -
$ libcamera-vid --help
Valid options are:
-h [ --help ] [=arg(=1)] (=0) Print this help message
--version [=arg(=1)] (=0) Displays the build version number
--list-cameras [=arg(=1)] (=0) Lists the available cameras attached to the system.
--camera arg (=0) Chooses the camera to use. To list the available indexes, use the
--list-cameras option.
-v [ --verbose ] [=arg(=2)] (=1) Set verbosity level. Level 0 is no output, 1 is default, 2 is verbose.
-c [ --config ] [=arg(=config.txt)] Read the options from a file. If no filename is specified, default to
config.txt. In case of duplicate options, the ones provided on the command line
will be used. Note that the config file must only contain the long form
options.
--info-text arg (=#%frame (%fps fps) exp %exp ag %ag dg %dg)
Sets the information string on the titlebar. Available values:
%frame (frame number)
%fps (framerate)
%exp (shutter speed)
%ag (analogue gain)
%dg (digital gain)
%rg (red colour gain)
%bg (blue colour gain)
%focus (focus FoM value)
%aelock (AE locked status)
%lp (lens position, if known)
%afstate (AF state, if supported)
--width arg (=0) Set the output image width (0 = use default value)
--height arg (=0) Set the output image height (0 = use default value)
-t [ --timeout ] arg (=5000) Time (in ms) for which program runs
-o [ --output ] arg Set the output file name
--post-process-file arg Set the file name for configuring the post-processing
--rawfull [=arg(=1)] (=0) Force use of full resolution raw frames
-n [ --nopreview ] [=arg(=1)] (=0) Do not show a preview window
-p [ --preview ] arg (=0,0,0,0) Set the preview window dimensions, given as x,y,width,height e.g. 0,0,640,480
-f [ --fullscreen ] [=arg(=1)] (=0) Use a fullscreen preview window
--qt-preview [=arg(=1)] (=0) Use Qt-based preview window (WARNING: causes heavy CPU load, fullscreen not
supported)
--hflip [=arg(=1)] (=0) Request a horizontal flip transform
--vflip [=arg(=1)] (=0) Request a vertical flip transform
--rotation arg (=0) Request an image rotation, 0 or 180
--roi arg (=0,0,0,0) Set region of interest (digital zoom) e.g. 0.25,0.25,0.5,0.5
--shutter arg (=0) Set a fixed shutter speed in microseconds
--analoggain arg (=0) Set a fixed gain value (synonym for 'gain' option)
--gain arg Set a fixed gain value
--metering arg (=centre) Set the metering mode (centre, spot, average, custom)
--exposure arg (=normal) Set the exposure mode (normal, sport)
--ev arg (=0) Set the EV exposure compensation, where 0 = no change
--awb arg (=auto) Set the AWB mode (auto, incandescent, tungsten, fluorescent, indoor, daylight,
cloudy, custom)
--awbgains arg (=0,0) Set explict red and blue gains (disable the automatic AWB algorithm)
--flush [=arg(=1)] (=0) Flush output data as soon as possible
--wrap arg (=0) When writing multiple output files, reset the counter when it reaches this
number
--brightness arg (=0) Adjust the brightness of the output images, in the range -1.0 to 1.0
--contrast arg (=1) Adjust the contrast of the output image, where 1.0 = normal contrast
--saturation arg (=1) Adjust the colour saturation of the output, where 1.0 = normal and 0.0 =
greyscale
--sharpness arg (=1) Adjust the sharpness of the output image, where 1.0 = normal sharpening
--framerate arg (=-1) Set the fixed framerate for preview and video modes
--denoise arg (=auto) Sets the Denoise operating mode: auto, off, cdn_off, cdn_fast, cdn_hq
--viewfinder-width arg (=0) Width of viewfinder frames from the camera (distinct from the preview window
size
--viewfinder-height arg (=0) Height of viewfinder frames from the camera (distinct from the preview window
size)
--tuning-file arg (=-) Name of camera tuning file to use, omit this option for libcamera default
behaviour
--lores-width arg (=0) Width of low resolution frames (use 0 to omit low resolution stream
--lores-height arg (=0) Height of low resolution frames (use 0 to omit low resolution stream
--mode arg Camera mode as W:H:bit-depth:packing, where packing is P (packed) or U
(unpacked)
--viewfinder-mode arg Camera mode for preview as W:H:bit-depth:packing, where packing is P (packed)
or U (unpacked)
--buffer-count arg (=0) Number of in-flight requests (and buffers) configured for video, raw, and
still.
--viewfinder-buffer-count arg (=0) Number of in-flight requests (and buffers) configured for preview window.
--autofocus-mode arg (=default) Control to set the mode of the AF (autofocus) algorithm.(manual, auto,
continuous)
--autofocus-range arg (=normal) Set the range of focus distances that is scanned.(normal, macro, full)
--autofocus-speed arg (=normal) Control that determines whether the AF algorithm is to move the lens as quickly
as possible or more steadily.(normal, fast)
--autofocus-window arg (=0,0,0,0) Sets AfMetering to AfMeteringWindows an set region used, e.g.
0.25,0.25,0.5,0.5
--lens-position arg Set the lens to a particular focus position, expressed as a reciprocal distance
(0 moves the lens to infinity), or "default" for the hyperfocal distance
--hdr [=arg(=1)] (=0) Enable (1) or disable (0) High Dynamic Range, where supported
--metadata arg Save captured image metadata to a file or "-" for stdout
--metadata-format arg (=json) Format to save the metadata in, either txt or json (requires --metadata)
-b [ --bitrate ] arg (=0) Set the video bitrate for encoding, in bits/second (h264 only)
--profile arg Set the encoding profile (h264 only)
--level arg Set the encoding level (h264 only)
-g [ --intra ] arg (=0) Set the intra frame period (h264 only)
--inline [=arg(=1)] (=0) Force PPS/SPS header with every I frame (h264 only)
--codec arg (=h264) Set the codec to use, either h264, mjpeg or yuv420
--save-pts arg Save a timestamp file with this name
-q [ --quality ] arg (=50) Set the MJPEG quality parameter (mjpeg only)
-l [ --listen ] [=arg(=1)] (=0) Listen for an incoming client network connection before sending data to the
client
-k [ --keypress ] [=arg(=1)] (=0) Pause or resume video recording when ENTER pressed
-s [ --signal ] [=arg(=1)] (=0) Pause or resume video recording when signal received
-i [ --initial ] arg (=record) Use 'pause' to pause the recording at startup, otherwise 'record' (the default)
--split [=arg(=1)] (=0) Create a new output file every time recording is paused and then resumed
--segment arg (=0) Break the recording into files of approximately this many milliseconds
--circular [=arg(=4)] (=0) Write output to a circular buffer of the given size (in MB) which is saved on
exit
--frames arg (=0) Run for the exact number of frames specified. This will override any timeout
set.
$ cvlc --help
VLC media player 3.0.20 Vetinari (revision 3.0.20-0-g6f0d0ab126b)
Usage: vlc [options] [stream] ...
You can specify multiple streams on the commandline.
They will be enqueued in the playlist.
The first item specified will be played first.
Options-styles:
--option A global option that is set for the duration of the program.
-option A single letter version of a global --option.
:option An option that only applies to the stream directly before it
and that overrides previous settings.
Stream MRL syntax:
[[access][/demux]://]URL[#[title][:chapter][-[title][:chapter]]]
[:option=value ...]
Many of the global --options can also be used as MRL specific :options.
Multiple :option=value pairs can be specified.
URL syntax:
file:///path/file Plain media file
http://host[:port]/file HTTP URL
ftp://host[:port]/file FTP URL
mms://host[:port]/file MMS URL
screen:// Screen capture
dvd://[device] DVD device
vcd://[device] VCD device
cdda://[device] Audio CD device
udp://[[]@[][:]]
UDP stream sent by a streaming server
vlc://pause: Pause the playlist for a certain time
vlc://quit Special item to quit VLC
core program (core)
Audio
--audio, --no-audio Enable audio
(default enabled)
--force-dolby-surround {0 (Auto), 1 (On), 2 (Off)}
Force detection of Dolby Surround
--audio-replay-gain-mode {none,track,album}
Replay gain mode
--audio-replay-gain-preamp
Replay preamp
--audio-replay-gain-default
Default replay gain
--audio-time-stretch, --no-audio-time-stretch
Enable time stretching audio
(default enabled)
--audio-filter Audio filters
--audio-visual {any,visual,glspectrum,none}
Audio visualisations
Video
-f, --fullscreen, --no-fullscreen
Fullscreen video output
(default disabled)
--video-on-top, --no-video-on-top
Always on top
(default disabled)
--video-wallpaper, --no-video-wallpaper
Enable wallpaper mode
(default disabled)
--video-title-show, --no-video-title-show
Show media title on video
(default enabled)
--video-title-timeout
Show video title for x milliseconds
--video-title-position {0 (Centre), 1 (Left), 2 (Right), 4 (Top), 8 (Bottom), 5 (Top-Left), 6 (Top-Right), 9 (Bottom-Left), 10 (Bottom-Right)}
Position of video title
--mouse-hide-timeout
Hide cursor and fullscreen controller after x milliseconds
Snapshot:
--snapshot-path Video snapshot directory (or filename)
--snapshot-prefix Video snapshot file prefix
--snapshot-format {png,jpg,tiff}
Video snapshot format
--snapshot-preview, --no-snapshot-preview
Display video snapshot preview
(default enabled)
--snapshot-sequential, --no-snapshot-sequential
Use sequential numbers instead of timestamps
(default disabled)
Window properties:
--crop Video cropping
--custom-crop-ratios
Custom crop ratios list
--aspect-ratio Source aspect ratio
--autoscale, --no-autoscale
Video Auto Scaling
(default enabled)
--custom-aspect-ratios
Custom aspect ratios list
--deinterlace {0 (Off), -1 (Automatic), 1 (On)}
Deinterlace
--deinterlace-mode {auto,discard,blend,mean,bob,linear,x,yadif,yadif2x,phosphor,ivtc}
Deinterlace mode
--video-filter Video filter module
--video-splitter Video splitter module
Subpictures
On Screen Display:
--spu, --no-spu Enable sub-pictures
(default enabled)
--osd, --no-osd On Screen Display
(default enabled)
Subtitles:
--sub-file Use subtitle file
--sub-autodetect-file, --no-sub-autodetect-file
Autodetect subtitle files
(default enabled)
--sub-text-scale
Subtitles text scaling factor
Overlays:
--sub-source Subpictures source module
--sub-filter Subpictures filter module
Track settings:
--audio-language Audio language
--sub-language Subtitle language
--menu-language Menu language
--preferred-resolution {-1 (Best available), 1080 (Full HD (1080p)), 720 (HD (720p)), 576 (Standard Definition (576 or 480 lines)), 360 (Low Definition (360 lines)), 240 (Very Low Definition (240 lines))}
Preferred video resolution
Playback control:
--input-repeat
Input repetitions
--input-fast-seek, --no-input-fast-seek
Fast seek
(default disabled)
--rate Playback speed
Default devices:
--dvd DVD device
--vcd VCD device
Advanced:
--input-title-format
Change title according to current media
Input
--stream-filter Stream filter module
Playlist
Performance options:
-Z, --random, --no-random Play files randomly forever
(default disabled)
-L, --loop, --no-loop Repeat all
(default disabled)
-R, --repeat, --no-repeat Repeat current item
(default disabled)
--play-and-exit, --no-play-and-exit
Play and exit
(default disabled)
--play-and-stop, --no-play-and-stop
Play and stop
(default disabled)
--start-paused, --no-start-paused
Start paused
(default disabled)
--playlist-autostart, --no-playlist-autostart
Auto start
(default enabled)
--playlist-cork, --no-playlist-cork
Pause on audio communication
(default enabled)
--media-library, --no-media-library
Use media library
(default disabled)
--playlist-tree, --no-playlist-tree
Display playlist tree
(default disabled)
--open Default stream
--auto-preparse, --no-auto-preparse
Automatically preparse items
(default enabled)
--preparse-timeout
Preparsing timeout
--metadata-network-access, --no-metadata-network-access
Allow metadata network access
(default disabled)
--recursive {none,collapse,expand}
Subdirectory behaviour
--ignore-filetypes
Ignored extensions
--show-hiddenfiles, --no-show-hiddenfiles
Show hidden files
(default disabled)
-v, --verbose Verbosity (0,1,2)
--pidfile Write process id to file
--advanced, --no-advanced Show advanced options
(default disabled)
--interact, --no-interact Interface interaction
(default enabled)
-I, --intf Interface module
--extraintf Extra interface modules
--control Control interfaces
Hot keys
--hotkeys-y-wheel-mode {-1 (Ignore), 0 (Volume control), 2 (Position control), 3 (Position control reversed)}
Mouse wheel vertical axis control
--hotkeys-x-wheel-mode {-1 (Ignore), 0 (Volume control), 2 (Position control), 3 (Position control reversed)}
Mouse wheel horizontal axis control
--global-key-toggle-fullscreen
Fullscreen
--key-toggle-fullscreen
Fullscreen
--global-key-leave-fullscreen
Exit fullscreen
--key-leave-fullscreen
Exit fullscreen
--global-key-play-pause
Play/Pause
--key-play-pause Play/Pause
--global-key-faster
Faster
--key-faster Faster
--global-key-slower
Slower
--key-slower Slower
--global-key-rate-normal
Normal rate
--key-rate-normal Normal rate
--global-key-rate-faster-fine
Faster (fine)
--key-rate-faster-fine
Faster (fine)
--global-key-rate-slower-fine
Slower (fine)
--key-rate-slower-fine
Slower (fine)
--global-key-next Next
--key-next Next
--global-key-prev Previous
--key-prev Previous
--global-key-stop Stop
--key-stop Stop
--global-key-jump-extrashort
Very short backwards jump
--key-jump-extrashort
Very short backwards jump
--global-key-jump+extrashort
Very short forward jump
--key-jump+extrashort
Very short forward jump
--global-key-jump-short
Short backwards jump
--key-jump-short Short backwards jump
--global-key-jump+short
Short forward jump
--key-jump+short Short forward jump
--global-key-jump-medium
Medium backwards jump
--key-jump-medium Medium backwards jump
--global-key-jump+medium
Medium forward jump
--key-jump+medium Medium forward jump
--global-key-jump-long
Long backwards jump
--key-jump-long Long backwards jump
--global-key-jump+long
Long forward jump
--key-jump+long Long forward jump
--global-key-frame-next
Next frame
--key-frame-next Next frame
--global-key-quit Quit
--key-quit Quit
--global-key-vol-up
Volume up
--key-vol-up Volume up
--global-key-vol-down
Volume down
--key-vol-down Volume down
--global-key-vol-mute
Mute
--key-vol-mute Mute
--global-key-audio-track
Cycle audio track
--key-audio-track Cycle audio track
--global-key-audiodevice-cycle
Cycle through audio devices
--key-audiodevice-cycle
Cycle through audio devices
--global-key-subtitle-revtrack
Cycle subtitle track in reverse order
--key-subtitle-revtrack
Cycle subtitle track in reverse order
--global-key-subtitle-track
Cycle subtitle track
--key-subtitle-track
Cycle subtitle track
--global-key-subtitle-toggle
Toggle subtitles
--key-subtitle-toggle
Toggle subtitles
--global-key-program-sid-next
Cycle next program Service ID
--key-program-sid-next
Cycle next program Service ID
--global-key-program-sid-prev
Cycle previous program Service ID
--key-program-sid-prev
Cycle previous program Service ID
--global-key-aspect-ratio
Cycle source aspect ratio
--key-aspect-ratio
Cycle source aspect ratio
--global-key-crop Cycle video crop
--key-crop Cycle video crop
--global-key-toggle-autoscale
Toggle autoscaling
--key-toggle-autoscale
Toggle autoscaling
--global-key-incr-scalefactor
Increase scale factor
--key-incr-scalefactor
Increase scale factor
--global-key-decr-scalefactor
Decrease scale factor
--key-decr-scalefactor
Decrease scale factor
--global-key-deinterlace
Toggle deinterlacing
--key-deinterlace Toggle deinterlacing
--global-key-deinterlace-mode
Cycle deinterlace modes
--key-deinterlace-mode
Cycle deinterlace modes
--global-key-intf-show
Show controller in fullscreen
--key-intf-show Show controller in fullscreen
--global-key-wallpaper
Toggle wallpaper mode in video output
--key-wallpaper Toggle wallpaper mode in video output
--global-key-random
Random
--key-random Random
--global-key-loop Normal/Loop/Repeat
--key-loop Normal/Loop/Repeat
--global-key-zoom-quarter
1:4 Quarter
--key-zoom-quarter
1:4 Quarter
--global-key-zoom-half
1:2 Half
--key-zoom-half 1:2 Half
--global-key-zoom-original
1:1 Original
--key-zoom-original
1:1 Original
--global-key-zoom-double
2:1 Double
--key-zoom-double 2:1 Double
Jump sizes:
--extrashort-jump-size
Very short jump length
--short-jump-size
Short jump length
--medium-jump-size
Medium jump length
--long-jump-size Long jump length
--bookmark1 Playlist bookmark 1
--bookmark2 Playlist bookmark 2
--bookmark3 Playlist bookmark 3
--bookmark4 Playlist bookmark 4
--bookmark5 Playlist bookmark 5
--bookmark6 Playlist bookmark 6
--bookmark7 Playlist bookmark 7
--bookmark8 Playlist bookmark 8
--bookmark9 Playlist bookmark 9
--bookmark10 Playlist bookmark 10
-h, --help, --no-help print help for VLC (can be combined with --advanced and --help-verbose)
(default disabled)
-H, --full-help, --no-full-help
Exhaustive help for VLC and its modules
(default disabled)
--longhelp, --no-longhelp print help for VLC and all its modules (can be combined with --advanced and --help-verbose)
(default disabled)
--help-verbose, --no-help-verbose
ask for extra verbosity when displaying help
(default disabled)
-l, --list, --no-list print a list of available modules
(default disabled)
--list-verbose, --no-list-verbose
print a list of available modules with extra detail
(default disabled)
-p, --module print help on a specific module (can be combined with --advanced and --help-verbose). Prefix the module name with = for strict matches.
--ignore-config, --no-ignore-config
no configuration option will be loaded nor saved to config file
(default enabled)
--reset-config, --no-reset-config
reset the current config to the default values
(default disabled)
--reset-plugins-cache, --no-reset-plugins-cache
resets the current plugins cache
(default disabled)
--version, --no-version print version information
(default disabled)
--config use alternate config file
Note: add --advanced to your command line to see advanced options.
To get exhaustive help, use '-H'.
例如，你想myuser使用mypassword从任何主机连接到mysql服务器的话。
GRANT ALL PRIVILEGES ON *.* TO 'myuser'@'%'IDENTIFIED BY 'mypassword' WI
TH GRANT OPTION;
如果你想允许用户myuser从ip为192.168.1.6的主机连接到mysql服务器，并使用mypassword作
在 Service Pack 4 (SP 4), 是运行 Microsoft Windows Server 2003、 Microsoft Windows Storage Server 2003 或 Microsoft Windows 2000 服务器上您尝试安装 Microsoft SQL Server 2000 通过卷许可协议 (VLA) 媒体。 这样做, 收到以下错误信息CD KEY的 SQ
OS 7 has a new method that allows you to draw a view hierarchy into the current graphics context. This can be used to get an UIImage very fast.
I implemented a category method on UIView to get the vi
方法一:
在my.ini的[mysqld]字段加入：
skip-grant-tables
重启mysql服务，这时的mysql不需要密码即可登录数据库
然后进入mysql
mysql>use mysql;
mysql>更新 user set password=password('新密码') WHERE User='root';
mysq
背景
2014年11月12日，ASP.NET之父、微软云计算与企业级产品工程部执行副总裁Scott Guthrie，在Connect全球开发者在线会议上宣布，微软将开源全部.NET核心运行时，并将.NET 扩展为可在 Linux 和 Mac OS 平台上运行。.NET核心运行时将基于MIT开源许可协议发布，其中将包括执行.NET代码所需的一切项目——CLR、JIT编译器、垃圾收集器（GC）和核心
