Author: Robin

php

thinkphp 启动命令

php -S localhost:8080 -t public

Tags thinkphp

vlc 源码分析

(13条消息) VLC源码分析知识总结_c_m_deng的博客-CSDN博客

(13条消息) vlc源码分析–issue (未完待续)_王二の黄金时代的博客-CSDN博客

VLM

VLM: VideoLAN (Media) Manager

VLM is a little media manager originally designed to launch multiple
streams with only one VLC.

example

/// This file is included in libVLC main page in the doxygen documentation.

//! [minimal example]
#include <stdio.h>
#include <stdlib.h>
#include <inttypes.h>
#include <unistd.h>
#include <vlc/vlc.h>

int main(int argc, char* argv[])
{
    libvlc_instance_t * inst;
    libvlc_media_player_t *mp;
    libvlc_media_t *m;

    /* Load the VLC engine */
    inst = libvlc_new (0, NULL);//创建lbvlc 实例对象


    /* Create a new item */
    m = libvlc_media_new_location("http://mycool.movie.com/test.mov");
    //创建vlc播放媒体对象
    //m = libvlc_media_new_path("/path/to/test.mov");


    /* Create a media player playing environement */
    mp = libvlc_media_player_new_from_media (inst, m);

   //创建vlc播放器对象

    /* No need to keep the media now */
    libvlc_media_release (m);

    /* play the media_player */
    libvlc_media_player_play (mp);

     //执行播放器播放

    while (libvlc_media_player_is_playing(mp))
    { 

       //循环读取播放状态
        sleep (1);
        int64_t milliseconds = libvlc_media_player_get_time(mp);
        int64_t seconds = milliseconds / 1000;
        int64_t minutes = seconds / 60;
        milliseconds -= seconds * 1000;
        seconds -= minutes * 60;

        printf("Current time: %" PRId64 ":%" PRId64 ":%" PRId64 "\n",
               minutes, seconds, milliseconds);
    }

    /* Stop playing */
    libvlc_media_player_stop_async (mp);

    /* Free the media_player */
    libvlc_media_player_release (mp);

    libvlc_release (inst);

    return 0;
}
//! [minimal example]

源码解析

Tags vlc

gcc 编译链接动静态库

后缀

.c 源文件

.s 汇编文件 gcc -S main.c 生成汇编文件

.o 目标文件编译后的二进制文件

.h 头文件生命模块的对外接口

.a 静态连接库

.so 动态连接库

无 ELF文件可执行文件

生成可执行文件流程

.c 添加 .h 文件作为外部模块接口声明来调用

编译生成目标文件 gcc -c xxx.c 生成 xxx.o

连接目标文件生成可执行文件 ld xxx.o xxx1.x -o xxx

运行可执行文件 ./xxx

静态库生成及连接过程

编译生成目标文件 gcc -c static_lib.c 生成 static_lib.o

打包目标文件位静态文件库 ar rcs static_lib.a static_lib.o static_lib1.o static_lib2.o 将多个目标文件打包为 static_lib.a

使用静态库 gcc xxx.c -lstatic_lib.a -o app -l 参数指定静态库

动态库生成及连接过程

编译源码生成动态库 gcc -shared -fPIC -o shared_lib.so share_lib.c

使用动态库编译可执行文件 gcc main.c ./shared_lib.so -o app

php

laravel 一对多

class OctopusRecord extends Model
{
    use SoftDeletes;
    use HasFactory;
    protected $connection = "beiko_mysql";
    protected $table = 'octopus_records';

    //所有字段一定要满足 小写下划线模式
    public function triage_tags()
    {
        return $this->hasMany(OctopusRecordTriageTag::class,"octopus_record_id");
    }

}

$form->tab("分诊信息",function (Form $subform) {
            $subform->hasMany('triage_tags', "分诊标签", function (Form\NestedForm $nestedForm) {
                $nestedForm->hidden('id');
                $nestedForm->select('name', "标签")->options(TriageTag::all()->pluck('name', 'name'));
                //$nestedForm->text('name', "标签");
            });
            //->distinctFields(["name"]);
                //->useTable();
            //->useTab();;
            //$form->multipleSelect('triage_tags', "分诊标签")->options([0=>"无效",1=>"有效"]);
            //->options(TriageTag::all()->pluck('name', 'name'));

            $subform->textarea('conclusion', __('Conclusion'));
        });

Tags laravel, oneToMany

php

laravel log

Post author By Robin
Post date June 5, 2023
No Comments on laravel log

use Illuminate\Support\Facades\Log;

Log::info("triageTeam" . json_encode($triageTeam));
Log::info("schools" . json_encode($triageTeam->schools()));

强制使用dd($variable)能在页面打印变量 很好用

Tags laravel, log

makefile example

linux下 make file example

CC=gcc
all: helloworld.o
	$(CC) helloworld.o -o helloworld

helloworld.o:
	$(CC) -c helloworld.c -o helloworld.o

clean:
	rm helloworld helloworld.o

execute:
	./helloworld

linux 下交叉编译 windows 64 位应用

CC=x86_64-w64-mingw32-gcc
all: helloworld.o
	$(CC) helloworld.o -o helloworld.exe 

helloworld.o:
	$(CC) -c helloworld.c -o helloworld.o

clean:
	rm helloworld.exe helloworld.o

execute:
	wine ./helloworld.exe

Tags makefile

C++

VLC 编译

Post author By Robin
Post date May 17, 2023
No Comments on VLC 编译

vlc 是一个开源播放器能播放市面上大部分音视频

vlc 源码地址

VideoLAN / VLC · GitLab

vlc编译指导（交叉编译为windows 64 dll）

doc/BUILD-win32.md · master · VideoLAN / VLC · GitLab

血的教训（因为交叉编译对环境依赖很高主要是版本问题导致本地环境很难编译过）

vlc团队有docker环境安装（安装了所有依赖项拉下源码即可编译）

https://code.videolan.org/videolan/vlc/-/blob/master/extras/ci/gitlab-ci.yml

文档中有docker地址

variables:
    VLC_WIN32_IMAGE: registry.videolan.org/vlc-debian-win32:20221214121630
    VLC_WIN64_IMAGE: registry.videolan.org/vlc-debian-win64:20221214115142
    VLC_WIN_LLVM_MSVCRT_IMAGE: registry.videolan.org/vlc-debian-llvm-msvcrt:20221214101739
    VLC_WIN_LLVM_UCRT_IMAGE: registry.videolan.org/vlc-debian-llvm-ucrt:20221214110439
    VLC_DEBIAN_IMAGE: registry.videolan.org/vlc-debian-unstable:20221213103803
    VLC_ANDROID_IMAGE: registry.videolan.org/vlc-debian-android:20221214124003
    VLC_SNAP_IMAGE: registry.videolan.org/vlc-ubuntu-focal:20221023195550
    VLC_RASPBIAN_IMAGE: registry.videolan.org/vlc-ubuntu-raspberry:20221023200157
    VLC_WASM_EMSCRIPTEN: registry.videolan.org/vlc-debian-wasm-emscripten:20221213104631

不同的编译版本下载对应的docker镜像（镜像稍大需要耐性）

docker pull registry.videolan.org/vlc-debian-win64:20221011230137

本地运行

git bash

winpty docker run -v /c/Users/15699/vlcdirectory/:\vlc -u 0 -it –privileged=true registry.videolan.org/vlc-debian-win64:20221214115142 bash

CMD

docker run -v c://Users/15699/vlcdirectory/:/vlc -u 0 -it registry.videolan.org/vlc-debian-win64:20221214115142 bash

然后拉取源码运行编译（当然源码中需要下载很多第三方包）最好先下载下来然后在makefile指定本地文件

mkdir build
cd build
../vlc/extras/package/win32/build.sh -a x86_64

VLC 录像功能 – 简书 (jianshu.com)

给 vlc sdk 添加录像接口_mengzhengjie的博客-CSDN博客

更改VLC源码实现使用libVLC录像功能_sooth2008的博客-CSDN博客

Tags vlc

mysql

mysql 添加用户

CREATE USER 'test1'@'localhost' IDENTIFIED BY 'test1';

CREATE USER "用户"@"host" IDENTIFIED BY "密码"

当不限定host名字 用通配符 %


授权（记得执行 flush priviledges）

GRANT priv_type ON database.table TO Name@Host

grant all on *.* to 'test1'@'%';

grant select,insert,update,delete,create,drop on vtdc.employee to joe@10.163.225.87 identified by ‘123′;

权限列表

SELECT, INSERT, UPDATE, DELETE, CREATE, DROP, RELOAD, SHUTDOWN, PROCESS, FILE, REFERENCES, INDEX, ALTER, SHOW DATABASES, SUPER, CREATE TEMPORARY TABLES, LOCK TABLES, EXECUTE, REPLICATION SLAVE, REPLICATION CLIENT, CREATE VIEW, SHOW VIEW, CREATE ROUTINE, ALTER ROUTINE, CREATE USER, EVENT, TRIGGER

一般都是限定某个用户在某个库的全部角色

Tags createUser

java

DWR

Post author By Robin
Post date May 2, 2023
No Comments on DWR

DWR 全称 direct web remote

可将java的一个对象当成js一个对象执行方法返回结果

可以理解为js域通向java服务端的一种RPC（远程方法调用）

技术执行流为 js-> js 对象执行方法-> post 异步请求->DWRServlet->java 对象

中间post 异步请求与 DWRServlet 均被封装屏蔽

用户只需要调用DWRServlet 动态生成的js脚本里面生成的js对象的方法就可以发起通讯

Tags DWR

linux

HC-04

Post author By Robin
Post date April 21, 2023
No Comments on HC-04

同时具有BLE 和旧蓝牙功能

AT+NAME=?

OK+NAME=ORTHOCONE_S011

AT+NAME=XXXX

OKsetNAME

AT+BNAME=?

OK+BNAME=L_ORTHOCONE_S011

AT+BNAME=XXXX

receive:OKsetBNAME

AT+PIN=?

OK+PIN=1234

AT+PIN=1234

OKsetPIN

AT+VERSION

www.hc01.com V2.5, 2022-04-26

Tags AT