December 2018 – Page 2 – Records And Memorys

注意还要 unlock domain name

December 24, 2018August 5, 2019

how to use gdb on centos machine

以这个程序为例

#include <iostream>
#include <mysql/mysql.h>
#include <stdio.h>
using namespace std;
#define SERVER "localhost"
#define USER "root"
#define PASSWORD "Piercing77#"
#define DATABASE "shfuture"

int main()
{
MYSQL *connect;
connect=mysql_init(NULL);
if (!connect)
{
cout<<"MySQL Initialization failed";
return 1;
}
connect=mysql_real_connect(connect, HOST, USER, PASSWORD ,
DATABASE ,0,NULL,0);
if (connect)
{
cout<<"connection Succeeded\n";
}
else
{
cout<<"connection failed\n";
}

#include <iostream>

#include <mysql/mysql.h>

#include <stdio.h>

using namespace std;

#define SERVER "localhost"

#define USER "root"

#define PASSWORD "Piercing77#"

#define DATABASE "shfuture"

int main()

{

MYSQL *connect;

connect=mysql_init(NULL);

if (!connect)

{

cout<<"MySQL Initialization failed";

return 1;

}

connect=mysql_real_connect(connect, HOST, USER, PASSWORD ,

DATABASE ,0,NULL,0);

if (connect)

{

cout<<"connection Succeeded\n";

}

else

{

cout<<"connection failed\n";

}

编译，注意要带 -g , 因为是c++ ，所以用 g++, c程序用 gcc

g++ -g  -o connAndQuery  connAndQuery.c $(mysql_config --libs)

1	g++ -g -o connAndQuery connAndQuery.c $(mysql_config --libs)

启动gdb

gdb ./connAndQuery

1	gdb ./connAndQuery

流程控制

break line number : 在某行下断点 ,centos 显示行号 ctrl + c

run 执行

next 执行一步

c : 执行到完

break

gdb 带参数执行：

gdb --args executablename arg1 arg2 arg3

1	gdb --args executablename arg1 arg2 arg3

来源： https://stackoverflow.com/questions/6121094/how-do-i-run-a-program-with-commandline-arguments-using-gdb-within-a-bash-script

参考文章

http://www.math.bas.bg/~nkirov/2005/netb151/debugging-with-gdb.html

http://kirste.userpage.fu-berlin.de/chemnet/use/info/gdb/gdb_6.html

December 21, 2018

My local centos settings

MYSQL

root Piercing77#

user and pwd

liuyang liuyang.2345

jdk cd /usr/lib/jvm/java-1.8.0-openjdk-1.8.0.141-1.b16.el7_3.x86_64

用 wireshark trace ：

tshark -i wlp2s0 -w out1.pcap
蓝色部分是当前正在使用的 internet interface , 可以由这样决定
/sbin/ifconfig -a ，从图中可以看到

For supervisor , log in /var/log/supervisord.log

更改 supervisord.conf 以后，要

sudo supervisorctl reread

sudo supervisorctl update

PACKAGE 到这里去找 https://centos.pkgs.org/7/centos-x86_64

yum install vim
安装后配置文件在 etc/vimrc
检查是否已安装 ctags : yum list *ctags*

发现 ctags.i686 已经存在于 installed packages

what is ctags , 见 https://andrew.stwrt.ca/posts/vim-ctags/

December 21, 2018

线性与非线性

1. 线性linear，指量与量之间按比例、成直线的关系，在数学上可以理解为一阶导数为常数的函数；

非线性non-linear则指不按比例、不成直线的关系，一阶导数不为常数。

2. 线性的可以认为是1次曲线，比如y=ax+b ,即成一条直线

非线性的可以认为是2次以上的曲线，比如y=ax^2+bx+c，(x^2是x的2次方)，即不为直线的即可

3. 两个变量之间的关系是一次函数关系的——图象是直线，这样的两个变量之间的关系就是“线性关系”；

如果不是一次函数关系的——图象不是直线，就是“非线性关系

4. “线性”与“非线性”，常用于区别函数y = f (x)对自变量x的依赖关系。线性函数即一次函数，其图像为一条直线。其它函数则为非线性函数，其图像不是直线。

　　线性，指量与量之间按比例、成直线的关系，在空间和时间上代表规则和光滑的运动；而非线性则指不按比例、不成直线的关系，代表不规则的运动和突变。

　　比如，普通的电阻是线性元件，电阻R两端的电压U，与流过的电流I，呈线性关系，即R=U/I，R是一个定数。二极管的正向特性，就是一个典型的非线性关系，二极管两端的电压u，与流过的电流i不是一个固定的比值，即二极管的正向电阻值，是随不同的工作点(u、i)而不同的。

5. 在数学上，线性关系是指自变量x与因变量yo之间可以表示成y=ax+b ,（a,b为常数），即说x与y之间成线性关系。

不能表示成y=ax+b ,（a,b为常数），即非线性关系，非线性关系可以是二次，三次等函数关系，也可能是没有关系。

December 18, 2018January 30, 2019

travel

2018.12.18 办签证，预计元旦后取

~~亚航可以普吉到，曼谷回吗~~

马来西亚转机要签证吗

需要的软件： Google翻译，map，打车软件 (Grab,用泰国手机号注册)

要买：手机卡（happy卡） 3张， 70.6

1 泰铢= 2毛钱

行程：

大象，泰拳，岛，spa , 射击

关键字

phi phi island : 皮皮岛

patong beach : 巴东海滩

phuket town night market : 普吉镇夜市周六日

ferry schedule : 渡轮船期

Rassada pier : 拉沙达码头

：查龙码头

去普吉需要注意的：带笔，飞机上写出入境卡，出境卡放护照里，回来还要用

熊猫巴士巴东站在 best western 酒店停车场，终点是普吉镇 central phuket

2019年1月去时，汇率是 4.57 ，不要在机场换钱

tutu车巴东境内200，去卡伦400

let ‘s relax 不需预约

December 12, 2018

How to implement Event and Event handler in c++

December 5, 2018

books

learn c++ from game development : https://books.google.com/books?id=XAfXAwAAQBAJ&pg=PA214&lpg=PA214&dq=SendEvent+to+c%2B%2B+class&source=bl&ots=NpViEUChC3&sig=qtt8g6uK0RJrwDKEtFoX5I8hDdY&hl=en&sa=X&ved=2ahUKEwjf97fm2ojfAhWQLXwKHVxBCL0Q6AEwBXoECAkQAQ#v=onepage&q=SendEvent%20to%20c%2B%2B%20class&f=false

December 5, 2018

work with c++ event

google key word : c++ SendEvent to class

reference article :

https://www.codeguru.com/cpp/cpp/cpp_mfc/events/article.php/c4075/How-to-Work-with-Events-in-a-C-Class.htm

http://www.cplusplus.com/forum/general/70012/

December 4, 2018December 25, 2018

Telco Bridge cli tools analyze

Most important is : CliContext , look at the code (in TB640\tb2.8.63\src\libraries\tbxclitools\tbx_cli_tools_private.h)

/* Context of the CLI interface */
typedef struct _TBX_CLI_TOOLS_CLI_CONTEXT
{
	TBX_CLI_TOOLS_INIT_PARAMS					Params;

	/* Display buffer and log file */
	TBX_BOOL									fPrintAllowed;
	TBX_BOOL									fFirstRunDone;
	PTBX_CLI_TOOLS_DISPLAY_BUFFER				pDisplayBuf;
	PTBX_CLI_TOOLS_DISPLAY_BUFFER				pPrevDisplayBuf;
	PTBX_UINT8									pafEscapeChars;
	#ifdef TBX_CLI_TOOLS_USE_LOG_FILE
	FILE*										pLogFile;
	TBX_CHAR									szCurrentLogFileTime[ 64 ];
	TBX_CHAR									szCurrentLogFilePath[ 512 ];
	TBX_UINT32									un32CurrentLogFileSize;
	TBX_UINT32									un32CurrentLogFileSegment;
	#endif

	/* Buffer to gather user input */
	TBX_CLI_TOOLS_CMD_PRIVATE					CmdInput;

	/* Timestamps and other flags used for display */
	TBX_UINT32									un32LastRefreshTimestamp;
	TBX_BOOL									fRefreshRequired;
	TBX_BOOL									fKeyPressedRefreshRequired;
	TBX_BOOL									fClsRequired;
	TBX_BOOL									fImmediateValidation;
	TBX_BOOL									fNoWrap;
	TBX_UINT32									un32ScrollPositionMax;	/* Current maximum scroll position */
	TBX_UINT32									un32ScrollPosition;
	TBX_UINT32									un32ScrollPositionHor;	/* Horizontal scroll position */
	TBX_UINT32									un32ScrollSpeed;
	TBX_UINT32									un32ScrollSpeedTimestamp;
	TBX_UINT32									un32ScrollSpeedAccelerateTimestamp;
	TBX_UINT32									un32NbLogLinesDisplayed;
	TBX_UINT32									un32SelectedLineToBlink;
	TBX_UINT32									un32CheckpointCounter;
	TBX_UINT32									un32RefreshCounter;
	TBX_UINT32									un32BlinkCounter;
	TBX_UINT32									un32BlinkTimestamp;

	/* Circular buffer log */
	TBX_BOOL									fCircularLogFull;
	TBX_UINT32									un32CircularLogNextLineIndex;
	TBX_UINT32									un32CircularLogCurrentNbLines;
	TBX_UINT32									un32LastLogDisplayNbLines;
	PTBX_CLI_TOOLS_DISPLAY_LINE_PRIVATE			paCircularLog;
	PTBX_UINT8									pafCircularLogCheckpoints;
	PTBX_CHAR									pszTmpLine;

	#ifdef TBX_CLI_TOOLS_USE_LOG_FILE
	/* Disk write buffer */
	PTBX_CHAR									pszDiskWriteBuffer;
	TBX_UINT32									un32DiskWriteBufferCurLen;
	TBX_UINT32									un32DiskWriteBufferTimestamp;
	#endif

	/* Fifo of 'forced' keys */
	TBX_INT										aForcedKeysFifo[ TBX_CLI_TOOLS_MAX_FORCED_KEYS ];
	TBX_UINT32									un32ForcedKeysFifoPopIndex;
	TBX_UINT32									un32ForcedKeysFifoCount;

	/* Status of the usage of hostlib */
	TBX_BOOL									fUseHostlib;
	TBX_BOOL									fHostlibInUse;

	/* Hostlib message to send remote screen updates */
	TBX_BOOL											fGenerateRemoteScreen;
	TBX_MSG_HANDLE										hEvtRemoteScreen;
	PTBX_CLI_TOOLS_EVT_NOTIF_CLI_TOOLS_SCREEN_UPDATE	pEvtRemoteScreen;
	TBX_UINT32											un32EvtRemoteScreenMaxStrlen;
	TBX_UINT32											un32RemoteCurrentWidth;
	TBX_UINT32											un32RemoteCurrentHeight;
	TBX_UINT32											un32RemoteClsTimestamp;
	TBX_UINT32											un32RemotePollTimestamp;
	TBX_UINT32											un32LastRemoteRefreshSendTimestamp;
	TBX_HOST_INFO										RemoteControllingHostInfo;
	TBX_BOOL											fActuallyRemoteControlled;
	TBX_BOOL											fRemoteRefreshRequested;

	/* Used when remote controlling other host */
	TBX_FILTER_HANDLE									hRemoteScreenFilter;
	/* Array of detected remote hosts */
	TBX_CLI_TOOLS_REMOTE_HOST_CTX				aRemoteScreenHosts[ TBX_CLI_TOOLS_MAX_REMOTE_SCREEN_HOSTS ];
	TBX_UINT32									un32RemoteScreenCurrentIdx;
	TBX_UINT32									un32LastEscapePressedTimestamp;
	TBX_CHAR									szRemoteScreenHostName [TBX_API_NAME_MAX_LEN];
	TBX_CHAR									szRemoteScreenApplicationName [TBX_API_NAME_MAX_LEN];

	/* Threads and semaphores */
	TBX_CLI_TOOLS_THREAD_CONTEXT				CliThreadContext;
	TBX_MUTEX									Mutex;

	TBX_UINT32									un32StartTimestamp;
	TBX_UINT32									un32CurrentTimestamp;

} TBX_CLI_TOOLS_CLI_CONTEXT, *PTBX_CLI_TOOLS_CLI_CONTEXT;this

/* Context of the CLI interface */

typedef struct _TBX_CLI_TOOLS_CLI_CONTEXT

{

TBX_CLI_TOOLS_INIT_PARAMS Params;

/* Display buffer and log file */

TBX_BOOL fPrintAllowed;

TBX_BOOL fFirstRunDone;

PTBX_CLI_TOOLS_DISPLAY_BUFFER pDisplayBuf;

PTBX_CLI_TOOLS_DISPLAY_BUFFER pPrevDisplayBuf;

PTBX_UINT8 pafEscapeChars;

#ifdef TBX_CLI_TOOLS_USE_LOG_FILE

FILE* pLogFile;

TBX_CHAR szCurrentLogFileTime[ 64 ];

TBX_CHAR szCurrentLogFilePath[ 512 ];

TBX_UINT32 un32CurrentLogFileSize;

TBX_UINT32 un32CurrentLogFileSegment;

#endif

/* Buffer to gather user input */

TBX_CLI_TOOLS_CMD_PRIVATE CmdInput;

/* Timestamps and other flags used for display */

TBX_UINT32 un32LastRefreshTimestamp;

TBX_BOOL fRefreshRequired;

TBX_BOOL fKeyPressedRefreshRequired;

TBX_BOOL fClsRequired;

TBX_BOOL fImmediateValidation;

TBX_BOOL fNoWrap;

TBX_UINT32 un32ScrollPositionMax; /* Current maximum scroll position */

TBX_UINT32 un32ScrollPosition;

TBX_UINT32 un32ScrollPositionHor; /* Horizontal scroll position */

TBX_UINT32 un32ScrollSpeed;

TBX_UINT32 un32ScrollSpeedTimestamp;

TBX_UINT32 un32ScrollSpeedAccelerateTimestamp;

TBX_UINT32 un32NbLogLinesDisplayed;

TBX_UINT32 un32SelectedLineToBlink;

TBX_UINT32 un32CheckpointCounter;

TBX_UINT32 un32RefreshCounter;

TBX_UINT32 un32BlinkCounter;

TBX_UINT32 un32BlinkTimestamp;

/* Circular buffer log */

TBX_BOOL fCircularLogFull;

TBX_UINT32 un32CircularLogNextLineIndex;

TBX_UINT32 un32CircularLogCurrentNbLines;

TBX_UINT32 un32LastLogDisplayNbLines;

PTBX_CLI_TOOLS_DISPLAY_LINE_PRIVATE paCircularLog;

PTBX_UINT8 pafCircularLogCheckpoints;

PTBX_CHAR pszTmpLine;

#ifdef TBX_CLI_TOOLS_USE_LOG_FILE

/* Disk write buffer */

PTBX_CHAR pszDiskWriteBuffer;

TBX_UINT32 un32DiskWriteBufferCurLen;

TBX_UINT32 un32DiskWriteBufferTimestamp;

#endif

/* Fifo of 'forced' keys */

TBX_INT aForcedKeysFifo[ TBX_CLI_TOOLS_MAX_FORCED_KEYS ];

TBX_UINT32 un32ForcedKeysFifoPopIndex;

TBX_UINT32 un32ForcedKeysFifoCount;

/* Status of the usage of hostlib */

TBX_BOOL fUseHostlib;

TBX_BOOL fHostlibInUse;

/* Hostlib message to send remote screen updates */

TBX_BOOL fGenerateRemoteScreen;

TBX_MSG_HANDLE hEvtRemoteScreen;

PTBX_CLI_TOOLS_EVT_NOTIF_CLI_TOOLS_SCREEN_UPDATE pEvtRemoteScreen;

TBX_UINT32 un32EvtRemoteScreenMaxStrlen;

TBX_UINT32 un32RemoteCurrentWidth;

TBX_UINT32 un32RemoteCurrentHeight;

TBX_UINT32 un32RemoteClsTimestamp;

TBX_UINT32 un32RemotePollTimestamp;

TBX_UINT32 un32LastRemoteRefreshSendTimestamp;

TBX_HOST_INFO RemoteControllingHostInfo;

TBX_BOOL fActuallyRemoteControlled;

TBX_BOOL fRemoteRefreshRequested;

/* Used when remote controlling other host */

TBX_FILTER_HANDLE hRemoteScreenFilter;

/* Array of detected remote hosts */

TBX_CLI_TOOLS_REMOTE_HOST_CTX aRemoteScreenHosts[ TBX_CLI_TOOLS_MAX_REMOTE_SCREEN_HOSTS ];

TBX_UINT32 un32RemoteScreenCurrentIdx;

TBX_UINT32 un32LastEscapePressedTimestamp;

TBX_CHAR szRemoteScreenHostName [TBX_API_NAME_MAX_LEN];

TBX_CHAR szRemoteScreenApplicationName [TBX_API_NAME_MAX_LEN];

/* Threads and semaphores */

TBX_CLI_TOOLS_THREAD_CONTEXT CliThreadContext;

TBX_MUTEX Mutex;

TBX_UINT32 un32StartTimestamp;

TBX_UINT32 un32CurrentTimestamp;

} TBX_CLI_TOOLS_CLI_CONTEXT, *PTBX_CLI_TOOLS_CLI_CONTEXT;this

this struct include another import struct TBX_CLI_TOOLS_INIT_PARAMS

initialize in function “TBX_RESULT TbxCliToolsInit ” in file “tbx_cli_tools.c”

other modules first include “tbx_cli.h” and “tbx_cli_tools.h” , then initial TBX_CLI_TOOLS_INIT_PARAMS , then call TbxCliToolsInit to init cli tools

One example is tb_watchdog.c

How to switch display buffer

create a command lin update thread : TbxCliToolsCliThread in file “tbx_cli_tools.c”

in this thread , switch buffer like this code show

/* Swap the current and previous display buffers */
{
	PTBX_CLI_TOOLS_DISPLAY_BUFFER pbySwapTmp	= pCliToolsCtx->pDisplayBuf;
	pCliToolsCtx->pDisplayBuf					= pCliToolsCtx->pPrevDisplayBuf;
	pCliToolsCtx->pPrevDisplayBuf				= pbySwapTmp;
	pDisplayBuffer								= pCliToolsCtx->pDisplayBuf;
}

/* Swap the current and previous display buffers */

{

PTBX_CLI_TOOLS_DISPLAY_BUFFER pbySwapTmp = pCliToolsCtx->pDisplayBuf;

pCliToolsCtx->pDisplayBuf = pCliToolsCtx->pPrevDisplayBuf;

pCliToolsCtx->pPrevDisplayBuf = pbySwapTmp;

pDisplayBuffer = pCliToolsCtx->pDisplayBuf;

}

the thread is created in function “TbxCliToolsStart” in file “tbx_cli_tools.c”

in this thread , call “TBXCliToolsLine_fprintf” ——-> “TBXCli_fprintf” to actually print on the screen

TbxCliToolsStart is supply for invoke by out of lib

各文件分析：

tbx_cli.c : 全是函数，比如清屏，cursor移动到最开始的位置等

tbx_cli_tools.c :

最重要的函数是： TbxCliToolsCliThread ，这是一个线程函数，不停的在双缓存之间切换

常用函数

TBXCliHome ：设置 cursor位置回点 (0,0)

光标位置

TbxCliToolsCliUserPromptDisplay

如何响应键盘事件

已解决

如何改变提示文本，并让用户选择yes no

CmdInput

CmdType

Month: December 2018

如何连接域名和IP