博客园_南桥一梦

解决WebClient或HttpWebRequest首次连接缓慢问题

2011-11-12T16:46:00Z

【编程环境】Visual Studio 2010, NET4.0

【开发语言】C#, 理论上VB.NET等依赖.NET Framework框架的语言均受此影响

【问题描述】

使用HttpWebRequest抓取网页内容,但首次请求总是莫名奇妙的阻塞在Request.GetResponse();上,不过一旦这次请求成功，后续的操作就很快了(如果是针对同一对象)。

相同的代码编译在NET3.5环境中却一切正常,而在NET4.0环境中执行就出这问题,难道是一个BUG?

【解决方案】

在配置文件中(.config)中添加配置节:

<?xml version="1.0"?>
<configuration>
<startup>
<supportedRuntime version="v4.0" sku=".NETFramework,Version=v4.0"/>
</startup>
<system.net>
<defaultProxy
enabled="false"
useDefaultCredentials="false" >
<proxy/>
<bypasslist/>
<module/>
</defaultProxy>
</system.net>
</configuration>

【问题所在】

.NET4.0中的默认代理是开启的,而我并没有设置!故只有等待超时后才会绕过代理,这就阻塞了.

【参考资料】

"It's not set at all in app.cong or machine.config. Hmm. If I'm reading the
MSDN docs right, the default for defaultProxy.enabled is TRUE if the element
isn't specified at all. That would be consistent with my observations.
"

http://msdn2.microsoft.com/en-us/library/kd3cf2ex(VS.80).aspx

【问题引申】

如果在其它版本的.NET环境中遇到类似问题,不妨尝试WebClient.Proxy = null;或HttpWebRequest.Proxy = null.

【总结】

问题往往出于不注意,我们要多加'小心'.

希望能帮到您!

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Ubuntu MySQL Master-Master InnoDb Utf-8 配置文件

2011-10-16T11:58:00Z

Master 1 Config File:

#
# The MySQL database server configuration file.
#
[client]
port        = 3306
socket        = /var/run/mysqld/mysqld.sock
default-character-set   = utf8

# This was formally known as [safe_mysqld]. Both versions are currently parsed.
[mysqld_safe]
socket        = /var/run/mysqld/mysqld.sock
nice        = 0

[mysqld]
#My Features
default-character-set   = utf8
skip-name-resolve
default-storage-engine = InnoDB
default-table-type = InnoDB
innodb_flush_log_at_trx_commit=0
federated

#Master
server-id = 1
log-bin=mysql-bin
binlog-do-db=s3
binlog-ignore-db=mysql
sync_binlog=1
auto_increment_increment=2
auto_increment_offset=1

#Slave
skip-name-resolve
slave-skip-errors 
log-slave-updates
master-user=sync
master-password=123456
master-port=3306
master-connect-retry=30
replicate-do-db=s3
relay-log=S3-DB-M-1-relay-bin
#
# * Basic Settings
#

user        = mysql
socket        = /var/run/mysqld/mysqld.sock
port        = 3306
basedir        = /usr
datadir        = /var/lib/mysql
tmpdir        = /tmp
skip-external-locking
#
# Instead of skip-networking the default is now to listen only on
# localhost which is more compatible and is not less secure.
#bind-address        = 127.0.0.1
#
# * Fine Tuning
#
key_buffer        = 16M
max_allowed_packet    = 16M
thread_stack        = 192K
thread_cache_size       = 8
# This replaces the startup script and checks MyISAM tables if needed
# the first time they are touched
myisam-recover         = BACKUP
#max_connections        = 100
#table_cache            = 64
#thread_concurrency     = 10
#
# * Query Cache Configuration
#
query_cache_limit    = 1M
query_cache_size        = 16M
#
# * Logging and Replication
#
# Both location gets rotated by the cronjob.
# Be aware that this log type is a performance killer.
# As of 5.1 you can enable the log at runtime!
#general_log_file        = /var/log/mysql/mysql.log
#general_log             = 1

log_error                = /var/log/mysql/error.log

# Here you can see queries with especially long duration
#log_slow_queries    = /var/log/mysql/mysql-slow.log
#long_query_time = 2
#log-queries-not-using-indexes
#
# The following can be used as easy to replay backup logs or for replication.
# note: if you are setting up a replication slave, see README.Debian about
#       other settings you may need to change.
#server-id        = 1
#log_bin            = /var/log/mysql/mysql-bin.log
expire_logs_days    = 10
max_binlog_size         = 100M
#binlog_do_db        = include_database_name
#binlog_ignore_db    = include_database_name

[mysqldump]
quick
quote-names
max_allowed_packet    = 24M

[mysql]
#no-auto-rehash    # faster start of mysql but no tab completition

[isamchk]
key_buffer        = 16M

#
# * IMPORTANT: Additional settings that can override those from this file!
#   The files must end with '.cnf', otherwise they'll be ignored.
#
!includedir /etc/mysql/conf.d/

Master 2 Config File:

#
# The MySQL database server configuration file.
#
# You can copy this to one of:
# - "/etc/mysql/my.cnf" to set global options,
# - "~/.my.cnf" to set user-specific options.
# 
# One can use all long options that the program supports.
# Run program with --help to get a list of available options and with
# --print-defaults to see which it would actually understand and use.
#
# For explanations see
# http://dev.mysql.com/doc/mysql/en/server-system-variables.html

# This will be passed to all mysql clients
# It has been reported that passwords should be enclosed with ticks/quotes
# escpecially if they contain "#" chars...
# Remember to edit /etc/mysql/debian.cnf when changing the socket location.
[client]
port        = 3306
socket        = /var/run/mysqld/mysqld.sock
default-character-set   = utf8

# Here is entries for some specific programs
# The following values assume you have at least 32M ram

# This was formally known as [safe_mysqld]. Both versions are currently parsed.
[mysqld_safe]
socket        = /var/run/mysqld/mysqld.sock
nice        = 0

[mysqld]
default-character-set   = utf8
skip-name-resolve
default-storage-engine = InnoDB
default-table-type = InnoDB
innodb_flush_log_at_trx_commit=0
federated

#master
server-id = 2
log-bin=mysql-bin
binlog-do-db=s3
binlog-ignore-db=mysql
sync_binlog=1
auto_increment_increment=2
auto_increment_offset=2

#Slave
skip-name-resolve
slave-skip-errors 
log-slave-updates
master-user=sync
master-password=123456
master-port=3306
master-connect-retry=30 #断网后间隔30秒重连
replicate-do-db=s3
relay-log=S3-DB-M-2-relay-bin

#
# * Basic Settings
#

#
# * IMPORTANT
#   If you make changes to these settings and your system uses apparmor, you may
#   also need to also adjust /etc/apparmor.d/usr.sbin.mysqld.
#

user        = mysql
socket        = /var/run/mysqld/mysqld.sock
port        = 3306
basedir        = /usr
datadir        = /var/lib/mysql
tmpdir        = /tmp
skip-external-locking
#
# Instead of skip-networking the default is now to listen only on
# localhost which is more compatible and is not less secure.
#bind-address        = 127.0.0.1
#
# * Fine Tuning
#
key_buffer        = 16M
max_allowed_packet    = 16M
thread_stack        = 192K
thread_cache_size       = 8
# This replaces the startup script and checks MyISAM tables if needed
# the first time they are touched
myisam-recover         = BACKUP
#max_connections        = 100
#table_cache            = 64
#thread_concurrency     = 10
#
# * Query Cache Configuration
#
query_cache_limit    = 1M
query_cache_size        = 16M
#
# * Logging and Replication
#
# Both location gets rotated by the cronjob.
# Be aware that this log type is a performance killer.
# As of 5.1 you can enable the log at runtime!
#general_log_file        = /var/log/mysql/mysql.log
#general_log             = 1

log_error                = /var/log/mysql/error.log

# Here you can see queries with especially long duration
#log_slow_queries    = /var/log/mysql/mysql-slow.log
#long_query_time = 2
#log-queries-not-using-indexes
#
# The following can be used as easy to replay backup logs or for replication.
# note: if you are setting up a replication slave, see README.Debian about
#       other settings you may need to change.
#server-id        = 1
#log_bin            = /var/log/mysql/mysql-bin.log
expire_logs_days    = 10
max_binlog_size         = 100M
#binlog_do_db        = include_database_name
#binlog_ignore_db    = include_database_name
#
# * InnoDB
#
# InnoDB is enabled by default with a 10MB datafile in /var/lib/mysql/.
# Read the manual for more InnoDB related options. There are many!
#
# * Security Features
#
# Read the manual, too, if you want chroot!
# chroot = /var/lib/mysql/
#
# For generating SSL certificates I recommend the OpenSSL GUI "tinyca".
#
# ssl-ca=/etc/mysql/cacert.pem
# ssl-cert=/etc/mysql/server-cert.pem
# ssl-key=/etc/mysql/server-key.pem



[mysqldump]
quick
quote-names
max_allowed_packet    = 24M

[mysql]
#no-auto-rehash    # faster start of mysql but no tab completition

[isamchk]
key_buffer        = 16M

#
# * IMPORTANT: Additional settings that can override those from this file!
#   The files must end with '.cnf', otherwise they'll be ignored.
#
!includedir /etc/mysql/conf.d/

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Ubuntu MySQL热备份安装

2011-10-14T14:23:00Z

参考资料：

　　http://www.cnblogs.com/wuhou/archive/2008/09/28/1301071.html

　　http://www.hebaodans.com/2009/02/m-y-s-q-l-shu-ju-ku-de-tong-bu-wen-ti-shuang-ji-re-bei/

1.安装最新的Ubuntu Server版本，并更新系统。

2.安装MySQL Server:sudo apt-get instal mysql-server，然后设置管理员密码，去掉本地地址绑定，以便可以进行远程访问。

主：192.168.137.12

从：192.168.137.13

3.设置utf8字符集来支持中文，在主从服务器的配置文件/etc/mysql/my.cnf中加入：

[client]
default-character-set   = utf8

[mysqld]
default-character-set   = utf8

init_connect    = 'SET NAMES utf8;'

4.在服务器中启动备份。首先在主服务器在配置文件中添加下面的内容。其中s3（举个例子）为需要同步的数据库。

[mysqld]

log-bin         = mysql-bin
server-id       = 1
binlog-do-db    = s3

5.重新启动主数据库。

sudo service start mysql

6.连接到主数据库，并创建你需要同步的数据库，如果已经存在可以忽略这一步。

mysql –u root –p

create database s3;

7.在服务器中添加一个账号(sync)用于同步数据库，并赋予从备份的权限，重要。

grant replication slave on *.* to 'sync'@'%' identified by '12345'

8.记录s3数据库的日志文件名称和位置，用于从机备份开始的位置。

mysql> show master status;
+------------------+----------+--------------+------------------+
| File | Position | Binlog_Do_DB | Binlog_Ignore_DB |
+------------------+----------+--------------+------------------+
| mysql-bin.000007 | 106 | s3 | |
+------------------+----------+--------------+------------------+

9.修改从机的配置文件。

[mysqld]
server-id = 2
read-only
master-connect-retry = 60
replicate-do-db = s3

10.重新启动从机，新建数据库(s3)或者从原来的数据库恢复数据库。并执行命令：

change master to MASTER_HOST='192.168.137.12', MASTER_USER='sync',MASTER_PASSWORD='12345',MASTER_LOG_FILE='mysql-bin.000007',MASTER_LOG_POS=106;

11.启动从机备份，并查看从机状态。

start slave;

show slave status\G;
*************************** 1. row ***************************
               Slave_IO_State: Waiting for master to send event
                  Master_Host: 192.168.137.12
                  Master_User: sync
                  Master_Port: 3306
                Connect_Retry: 60
              Master_Log_File: mysql-bin.000007
          Read_Master_Log_Pos: 106
               Relay_Log_File: S3-DB-SLAVE-1-relay-bin.000010
                Relay_Log_Pos: 251
        Relay_Master_Log_File: mysql-bin.000007
             Slave_IO_Running: Yes
            Slave_SQL_Running: Yes
              Replicate_Do_DB: s3
          Replicate_Ignore_DB:
           Replicate_Do_Table:
       Replicate_Ignore_Table:
      Replicate_Wild_Do_Table:
Replicate_Wild_Ignore_Table:
                   Last_Errno: 0
                   Last_Error:
                 Skip_Counter: 0
          Exec_Master_Log_Pos: 106
              Relay_Log_Space: 559
              Until_Condition: None
               Until_Log_File:
                Until_Log_Pos: 0
           Master_SSL_Allowed: No
           Master_SSL_CA_File:
           Master_SSL_CA_Path:
              Master_SSL_Cert:
            Master_SSL_Cipher:
               Master_SSL_Key:
        Seconds_Behind_Master: 0
Master_SSL_Verify_Server_Cert: No
                Last_IO_Errno: 0
                Last_IO_Error:
               Last_SQL_Errno: 0
               Last_SQL_Error:
1 row in set (0.00 sec)

Slave_IO_Running: Yes
Slave_SQL_Running: Yes

表示工作正常，否者出现问题。出现问题重要的解决工具是查看日志记录。

cat /var/log/mysql/error.log

本文链接

HOWTO：为 Hyper-V 配置外部网络

2011-10-13T14:53:00Z

近来相信不少朋友都在测试体验Hyper-V，有些甚至已经开始在生产环境下进行评估，但是同时可能会遭遇到这样的问题，当添加了hyper-VRoles，安装了虚拟机，并将虚拟机的网卡配置为外部网络类型，以桥接到宿主网卡上与宿主网络进行通讯。此时以为大功告成便上架开始使用，但是却发现HostOS无法连接了。本人也遭遇到了这个情况，呵呵！受之前产品的影响没有仔细去了解Hyper-V的网络结构，昨天前往实验机所在办公室进行了调试，总算解决了该问题，现在与大家分享。
在之前所使用的虚拟机平台时，如：VirtualServer/PC以及VMware，我们都惯用桥接方式将虚拟机网卡桥接到宿主网卡上，便可以直接进行通讯。但是在Hyper-V平台上，这一方式被改进了，我个人猜想应该是微软出于整个宿主环境与虚拟环境的兼容性、稳定性与安全性才修改了网络结构。即，当我们对Hyper-V进行初始配置时需要为虚拟机环境提供一块用于通讯的物理网卡，当执行完配置后，系统会为当前的HostOS添加一块虚拟网卡，用于HostOS与网络的通讯。而此时的物理网卡除了作为网络的物理连接外，还兼做虚拟交换机，为HostOS及GuestOS提供网络通讯。如果还是对这个概念比较模糊，那么请注意下面的网络示意图。
传统模式：
应用程序直接与物理网卡连接并与物理网络建立通讯，在VirtualServer/PC上，虚拟机网卡与物理网卡桥接后与物理网络建立通讯。
Hyper-VExternalNetwork：

在Hyper-V上当配置了外部网络后，系统则自动添加一块虚拟网卡用于HostOS的通讯，而物理网卡则用于物理连接及虚拟交换机。

明白以上的示意图后，我们再次登录系统去查看一下当前的网卡及连接状态，图中“LocalAreaConnection2”是一块未连接的物理网卡，排除在外。其中"LocalAreaConnection"是已经连接至网络的物理网卡，而"LocalAreaConnection4"则是真正用于HostOS连接网络的网卡。

我们分别看一下各网卡的连接状况，"LocalAreaConnection"状态显示并未使用任何网络协议连接，通过查看该连接的网络属性我们可以看到，该网卡只绑定了"MicrosoftVirtualNetworkSwitchProtocol"。

"LocalAreaConnection4"连接状态显示正常，此外连接速率竟然高达10Gbps，呵呵！该网卡的网络属性中我们可以看到它进行了常规的协议和服务绑定。

OK，以上的粗鲁讲解希望大家已经明白是怎么回事！因为物理网络中存在有效的DHCP，所以当系统添加了"LocalAreaConnection4"后自动获取到了IP地址，并不会给出明显的提示，因为它已经自动获取到IP，在不了解Hyper-V的网络模式时，我们便会忽略！如果是远程方式进行配置则会造成网络中断。

为此，我们需要正确的为"LocalAreaConnection4"配置网络，添加IP等相关信息。

最后不要忘记为你当前的网络配置网络类型，因我用于实验的Dell2950处于内网，所以我选择为专用网络，并允许了网络发现及网络共享。

本文链接

一键设置批处理：把Windows Server 2008打造成Workstation(转)

2011-10-13T14:51:00Z

估计很多小白和我一样用Windows Server 2008做自己的桌面OS，因为传说Server 2008“比Vista SP1快”，“内核和Vista SP1完全一样”，“可以通过Vista的OEM激活”，在MSDN Blog（上下）上看到有人总结了一下安装完毕Server 2008之后改造Workstation的步骤，自己改写了一个批处理版本，双击直接搞定。

核心内容：

安装Windows特性：Telnet客户端、桌面体验、无线管理
开启Theme、Windows Audio、Superfetch
禁用关机理由，登录Ctrl+Alt+Del
CPU优化为前台程序而不是后台服务（可能需要重启）
开启各种视觉效果
关闭自动播放
再不关闭IE Sec的情况下，把Internet区域的安全设定为Medium-high

代码采用GPL 2开源 -_-!
:Windows Server 2008 转换为Workstation批处理设置工具 V1.0 :By est, electronicstar@126.com :2008-3-12 :可以自行在services.msc里启用Windows Image Acquisition(WIA)增加对摄像头的支持 :需要手动自己关闭DEP :需要手动在GpEdit.msc里修改 Users 组可以关机 :需要手动开启“防火墙屏蔽程序时通知我” :某些情况下需要手动编辑磁盘权限，给Users组加上可读写 :可以使用powercfg -h on来开启休眠 :需要手动更改主题为Windows Aero :至于DX9, DX10, Virtualization, 驱动, 音视频解码包需要用户手动安装

:导入注册表设置 more +40 < "%~f0" > "%temp%\tmp.reg" regedit /s "%temp%\tmp.reg"

:安装telnet命令、桌面体验、无线支持 pkgmgr /iu:TelnetClient;DesktopExperience;WirelessNetworking

:启用桌面主题 sc config Themes start= auto sc start Themes

:启用Windows声音 sc config MMCSS start= auto sc start MMCSS sc config AudioEndpointBuilder start= auto sc start AudioEndpointBuilder sc config Audiosrv start= auto sc start Audiosrv

:启用Superfetch sc config SysMain start= auto sc start SysMain

:结束批处理设置 goto:eof

Windows Registry Editor Version 5.00

;禁用关机理由 [HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Group Policy Objects\{EEB3B0FE-E195-40F9-B7E5-6A13CDFDC255}Machine\Software\Policies\Microsoft\Windows NT\Reliability] "ShutdownReasonOn"=dword:00000000 "ShutdownReasonUI"=-

;禁用登录Ctrl+Alt+Del [HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System] "disablecad"=dword:00000001

;允许Superfetch [HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\Session Manager\Memory Management\PrefetchParameters] "EnablePrefetcher"=dword:00000003 "EnableSuperfetch"=dword:00000003

;CPU优化为Programs而不是Backgrond Services [HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\PriorityControl] "Win32PrioritySeparation"=dword:00000026

;开启视觉效果 [HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Explorer\VisualEffects] "VisualFXSetting"=dword:00000001

[HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Explorer\VisualEffects\AnimateMinMax] "DefaultValue"=dword:00000000 "DefaultApplied"=dword:00000001

[HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Explorer\VisualEffects\ComboBoxAnimation] "DefaultValue"=dword:00000000 "DefaultApplied"=dword:00000001

[HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Explorer\VisualEffects\ControlAnimations] "DefaultValue"=dword:00000000 "DefaultApplied"=dword:00000001

[HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Explorer\VisualEffects\CursorShadow] "DefaultValue"=dword:00000000 "DefaultApplied"=dword:00000001

[HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Explorer\VisualEffects\DragFullWindows] "DefaultValue"=dword:00000000 "DefaultApplied"=dword:00000001

[HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Explorer\VisualEffects\DropShadow] "DefaultValue"=dword:00000000 "DefaultApplied"=dword:00000001

[HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Explorer\VisualEffects\DWMEnabled] "DefaultValue"=dword:00000000 "DefaultApplied"=dword:00000001

[HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Explorer\VisualEffects\FontSmoothing]

[HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Explorer\VisualEffects\ListBoxSmoothScrolling] "DefaultValue"=dword:00000000 "DefaultApplied"=dword:00000001

[HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Explorer\VisualEffects\ListviewAlphaSelect] "DefaultValue"=dword:00000000 "DefaultApplied"=dword:00000001

[HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Explorer\VisualEffects\ListviewShadow] "DefaultValue"=dword:00000000 "DefaultApplied"=dword:00000001

[HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Explorer\VisualEffects\ListviewWatermark] "DefaultValue"=dword:00000000 "DefaultApplied"=dword:00000001

[HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Explorer\VisualEffects\MenuAnimation] "DefaultValue"=dword:00000000 "DefaultApplied"=dword:00000001

[HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Explorer\VisualEffects\SelectionFade] "DefaultValue"=dword:00000000 "DefaultApplied"=dword:00000001

[HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Explorer\VisualEffects\TaskbarAnimations] "DefaultValue"=dword:00000000 "DefaultApplied"=dword:00000001

[HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Explorer\VisualEffects\Themes]

[HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Explorer\VisualEffects\ThumbnailsOrIcon] "DefaultValue"=dword:00000000 "DefaultApplied"=dword:00000001

[HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Explorer\VisualEffects\TooltipAnimation] "DefaultValue"=dword:00000000 "DefaultApplied"=dword:00000001

[HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Explorer\VisualEffects\TransparentGlass] "DefaultValue"=dword:00000000 "DefaultApplied"=dword:00000001

[HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Explorer\VisualEffects\WebView] "DefaultValue"=dword:00000000 "DefaultApplied"=dword:00000001

;关闭自动播放 [HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Explorer\AutoplayHandlers] "DisableAutoplay"=dword:00000001

:在不关闭IE Sec的情况下把Internet安全级别调整为Medium-High [HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Internet Settings\Zones\3] "2004"=dword:00000000 "2001"=dword:00000000 "CurrentLevel"=dword:00011500 "1001"=dword:00000001 "1200"=dword:00000000 "1400"=dword:00000000 "1402"=dword:00000000 "1405"=dword:00000000 "1407"=dword:00000001 "1601"=dword:00000000 "1604"=dword:00000000 "1606"=dword:00000000 "1608"=dword:00000000 "1800"=dword:00000001 "1802"=dword:00000000 "1803"=dword:00000000 "1804"=dword:00000001 "1A00"=dword:00020000 "1A02"=dword:00000000 "1A03"=dword:00000000 "1A04"=dword:00000003 "1A05"=dword:00000001 "1A06"=dword:00000000 "1C00"=dword:00010000 "1E05"=dword:00020000 "2000"=dword:00000000 "2100"=dword:00000000 "2101"=dword:00000000 "2300"=dword:00000001 "2400"=dword:00000000 "2401"=dword:00000000 "2402"=dword:00000000 "2600"=dword:00000000 "2007"=dword:00010000

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Windows Form电子地图编程

2011-10-11T12:35:00Z

1. 支持普通和矢量图像文件，如wmf和svg。svg的显示推荐使用http://svg.codeplex.com/图形库，非常棒。

2. 把图形显示在PictureBox中比在OnPaint中绘制背景能够获得更好的性能。

3.svg的显示的图像会占用比较多的内存，正在解决中。

4.把Autocad转成svg，推荐使用Acme CAD Converter，可惜没有免费的，网上下载的没有注册能用，注册了都出现内存错误，不能用，郁闷中！

5.wmf的文件显示不能够抗锯齿，正在解决中。

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webbench(转)

2011-09-30T07:38:00Z

webbench是一款linux网站服务器压力测试工具，webbench最多可以模拟3万个并发连接去测试网站的负载能力，个人感觉要比Apache自带的ab压力测试工具好，安装使用也特别方便
1、适用系统：Linux

2、编译安装：
wget http://blog.s135.com/soft/linux/webbench/webbench-1.5.tar.gz
tar zxvf webbench-1.5.tar.gz
cd webbench-1.5
make && make install

3、使用：
webbench -c 500 -t 30 ttp://127.0.0.1/test.jpg

4、测试结果示例：
Webbench - Simple Web Benchmark 1.5
Copyright (c) Radim Kolar 1997-2004, GPL Open Source Software.

Benchmarking: GET ttp://127.0.0.1/test.jpg
500 clients, running 30 sec.

Speed=3230 pages/min, 11614212 bytes/sec.
Requests: 1615 susceed, 0 failed.

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HttpRuntime编程

2011-09-29T08:03:00Z

1.不能使用它获得非aspx文件的响应。

2.需要在另外的应用程序域中运行。

3.支持在Mono中运行，但要注意Web请求文件名称大小写的区别

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儿子的照片

2011-01-31T09:44:00Z

http://files.cnblogs.com/dyj057/son1024x768.zip

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Ubuntu的网络设置

2011-01-20T14:38:00Z

Ubuntu的网络参数保存在文件 /etc/network/interfaces中，默认设置使用dhcp，内容如下：

# The primary network interface
auto eth0
iface eth0 inet dhcp

也有可能是其它的网络接口如:eth1,eth2，根据具体的情况决定。

设置静态ip的方法如下：
1）编辑 /etc/network/interfaces
1.1）将dhcp 一行屏蔽
# The primary network interface
auto eth0
#iface eth0 inet dhcp

1.2）添加和静态ip有关的参数
# The primary network interface
iface eth0 inet static
address 192.168.0.10
netmask 255.255.255.0
gateway 192.168.0.1

2）编辑 /etc/resolv.conf，设置dns
nameserver 202.96.134.133
nameserver 202.106.0.20

3）执行下面两个命令，启用新设置
$sudo ifdown eth0
$sudo ifup eth0

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