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Showing posts from 2007

Eclipse CVS Repository Integration Watch Out

Eclipse has CVS version control integrated. It is nifty but some watch out to be careful of.

1. Always Refresh your project/ whole thing in the project view before performing Team - Synchronize With Repository or else you would not see your changes during synchronization and causing your changes GONE if you choose to update the files thinking your side have no changes!!!

2. Always use synchronize to check the changes. NEVER use the update (to overwrite local file with changes from server) or commit (to overwrite server/remote files with local file changes) to a folder directly. You would cause either server version get overwritten by your version if there are additional changes by others or your version get overwritten by server copy without doing the conflict checking and merge.

3. If you have already merged the changes (by comparing remote file and local file and use move change facility), your side with the server. Select ‘mark as merge’ and then commit.

MSSQL GROUP_CONCAT

This is using XML feature of the SQL server. (nothing new here)


select Type, RestaurantNames from Restaurant AS A CROSS APPLY
(SELECT RestaurantName + ',' FROM Restaurant AS B WHERE A.Type = B.Type FOR XML PATH('')) D (RestaurantNames) GROUP BY Type, RestaurantNames


This is to get something like below (similar to MYSQL GROUP_CONCAT)


Type |RestaurantNames
----- ---------------
Chinese Food | Ah Yat Abalone, Liang Yah Yong Tau Foo,
Indian Food | Kanna Curry House,
Western Fast Food | Burger King, McDonald

instead of multiple rows.

like
Type |RestaurantName
----- ---------------
Chinese Food |Ah Yat Abalone
Chinese Food |Liang Yah Yong Tau Foo
Indian Food |Kanna Curry House

ASP.NET i18n setting.

web.config<globalization requestencoding="utf-8" responseencoding="utf-8" fileencoding="utf-8"></globalization>If UTF-8 does not solve the problem for some reasons or feeling it is too consuming bytes since it standardize to 2 bytes.

use each language codec (multibyte mode) by specify.

<globalization requestencoding="euc-jp" responseencoding="euc-jp" enablebestfitresponseencoding="true"></globalization>
Note: the language codec must be installed of course in the first place.

Truncate String in XSL call-template

The purpose is to just prune the string and add ... at the end when certain size of the string in xsl output exceeded.
This method do not burden CPU much. (as some using recursive ways do)




<!-- include this into XSL stylesheet -->

<xsl:template name="fixed-string">
<xsl:param name="targetVar">
<xsl:param name="allowable-length">
<xsl:value-of select="substring($targetVar, 1, $allowable-length)">
<xsl:if test="string-length($targetVar) & gt ; $allowable-length">
<xsl:text>...</xsl:text>
</xsl:if>
</xsl:value-of></xsl:param></xsl:param></xsl:template>


To use it,

just

<xsl:call-template name="fixed-string">
<xsl:with-param name="targetVar">'<xsl:value-of select="MyContent">'</xsl:value-of>
<xsl:with-param name="allowable-length" select="15"> <!-- say, limited to 15 chars--> </x…

Press anykey to continue

Taken from http://www.codeproject.com/useritems/PressAnyKeyToContinue.asp



private void FlushConsole()
{
while( Console.In.Peek() != -1 )
{
Console.In.Read();
}
}

Console.WriteLine("Press any key to continue...");
FlushConsole();
Console.Read();

Crystal Report Formula - ToWords - Remove 'xx/100' the trailing string.

Left(ToWords(Sum ({YourTable.Field})), InStr(ToWords(Sum ({YourTable.Field})), " and ")) & " and " & ToWords(ToNumber (Right(ToText(Sum ({YourTable.Field})), 2 )), 0) & " cents."

LPAD in T-SQL and Crystal Report Formula

I am sure there should have some neater ways to do this but if all you need are just working version, here it goes.

T-SQL

REPLICATE('0', 8 - LEN(LTRIM(STR(YourTableField)))) + LTRIM(STR(YourTableField))


Crystal Report Formula

StringVar Message := "";
StringVar Num := {YourCrystalReportTable.Field};
Num := Trim (Num);
NumberVar Counter := 8 - Length(Num) ;
While (Counter > 0) do
(
Message := Message & "0";
Counter := Counter - 1;
);
Message := Message & Num

Workflow in ASP.NET

Same codes except
placing static variable

static WorkflowRuntime wr = new WorkflowRuntime();

in
Application_Start of global.asax

then

(quoted from MSLearning)

If you use the WorkflowWebRequestContext object to access the workflow runtime, you cannot add services such as persistence or scheduling services because the workflow is already started. If you try to add services to the runtime when it has already started it will generate an error. Instead, to configure the runtime with services, use the <workflowRuntime> section in the Web.config file:

[Web.config]
<configuration>
<configSections>
<section name="WorkflowRuntime"
type="WorkflowRuntimeSection, System.Workflow.Runtime" />
</configSections>
</configuration>

Host Workflow in .NET WinForm

Add reference to
- System.Workflow.Activities
- System.Workflow.Runtime
- System.Workflow.ComponentModel
- <the MyWorkflow assembly>

in the WinForm codes,

add member variable

WorkflowRuntime myWorkflowRuntime = new WorkflowRuntime()

Then, in the constructor of the winform.
//setup event handler
myWorkflowRuntime.WorkflowCompleted += new EventHandler<WorkflowCompletedEventArg>(wr_WFCompleted);
myWorkflowRuntime.WorkflowTerminated += new EventHandler<WorkflowTerminatedEventArg>(wr_WFTerminated);


//handler for the workflow thread.
void wr_WFCompleted(object sender, WorkflowCompletedEventArg e)
{
MessageBox.Show("Workflow output" + e.OutputParameters["Field"].ToString());
}


//to kick start the work flow thread.
Type type = typeof(MyNamespace.MyWorkflow);
//to pass parameter to the workflow thread.
Dictionary<string, object> param = Dictionary<string, object>;
param.Add("Field", System.Convert.ToInt32(123));
WorkflowInstance myWI= myWorkf…

WPF sample

(Nothing new, codes taken from MSLearning)

<Application x:Class="MyApp"
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
StartupUri="Window1.xaml">
Startup="MyApp_Startup"
Activated="MyApp_Activated"
Deactivated="MyApp_Deactivated"
SessionEnding="MyApp_SessionEnding"
Exit="MyApp_Exit"
</Application>





C#
public class MyApp : Application
{
StackPanel rootPanel;
Window win;

protected override void OnStartup(StartupEventArgs e)
{
win = new System.Windows.Window();
rootPanel = new StackPanel();
win.Content = rootPanel;
win.Show();
}

void MyApp_Startup (object sender, StartupEventArgs e)
{
//singleton model and where sharing information pages uses Properties.
MyApp.Current.Properties["TextFromPage1"] = txtBox.Text;

// Retrieve the information
string ap…

Hosting WPF (Avalon Control) in WinForm quick info

Though this code snippet already available in the Win SDK sample.

//the host should be a private member variable.
ElementHost host = new ElementHosy();
host.Dock = DockStyle.Fill;
myPanel.Controls.Add(host); //adding the control the panel control in the winform.
//the variable datatype available after added reference
//to the WPF/Avalon control and WPF namespace)
avControl = new MyNamespace.MyAVControl();
avControl.InitializeComponent();
host.Child = avControl; //control has been linked to the winform

//The RoutedEventHandler is used because the WPF in this case is a
//child control. There are 3 type of event routing namely direct, tunnel and bubble.
//refer http://msdn2.microsoft.com/en-us/library/ms742806.aspx#why_use
//for more info on the event on WPF.
avControl.Loaded += new RoutedEventHandler(avCtrl_Loaded);

//To use Avalon control in Win32 which wrap the Avalon control into HwndSource
//refer http://blogs.msdn.com/nickkramer/archive/2005/07/17/439659.aspx

Unix Debugging Cheat Sheet

pmap
To check the memory address mapping of the core dumped process.

e.g.

036AA000 2592k [heap]

So, it means 036AA000 and above is heap address.

FFB3A000 [stack]

And likewise.

Also can be used to check shared memory, shared libraries used and etc.

truss -d -o -p
System API trace.

gcore - o
Force core dump

Use dbx later to investigate the core file.

pstack

call stack.

ps -ef

getting running process PID.

Monitor system log file.
tail -f /var/adm/SYSLOG
tail -f /var/adm/messages
tail -f /var/log/syslog


ls -l /proc//as
ps -p -o pmem,vsz,osz,rss,pid
To check memory usage.

pldd
check dependencies

pargs
check all arguments passed to process.
Note: arg[0] is always the process execution path like even Win32. Useful also if the ls -l return truncated path.

Excel VBA for conditional formatting.

Sub CreateConditionalFormatting()


Dim column As String
column = "C"
Dim NoOfRowNeeded As Integer
NoOfRowNeeded = 3000
Dim j As Integer
Dim cellSelect As String
For j = 1 To NoOfRowNeeded

cellSelect = column & CStr(j)

Range(cellSelect).Select
Selection.FormatConditions.Delete
If (j - 1) < 1 Then


Range(cellSelect).Interior.ColorIndex = 4
Else

'maximum 3 formula allowed.
Selection.FormatConditions.Add Type:=xlExpression, Formula1:= _
"=INT(" & column & CStr(j - 1) & ") Selection.FormatConditions(1).Interior.ColorIndex = 3
Selection.FormatConditions.Add Type:=xlExpression, Formula1:= _
"=INT(" & column & CStr(j - 1) & ")>INT(" & column & CStr(j) & ")"
Selection.FormatConditions(2).Interior.ColorIndex = 6

Selection.FormatConditions.Add Type:=xlExpression, Formula1:= _
"=INT(" & column & CStr(j - 1) & ")=INT(" & col…

.NET 2.0 modifying content of app.config file (C#)

Before you start, make sure you have added reference to System.Configuration.dll for .NET 2.0. I think the default the Visual Studio C# Express referenced to is from .NET 1.1 which will not compile.

using System.Configuration;
using System.Collections.Specialized;

//to write
System.Configuration.Configuration config =
ConfigurationManager.OpenExeConfiguration(ConfigurationUserLevel.None);

config.AppSettings.Settings.Remove("myKey");
config.AppSettings.Settings.Add("myKey", "123");

config.Save(ConfigurationSaveMode.Modified);

ConfigurationManager.RefreshSection("appSettings");

//to read
NameValueCollection appSettings = System.Configuration.ConfigurationManager.AppSettings;
string strRead = (string)appSettings["myKey"];


Content of app.config

<?xml version="1.0" encoding="utf-8" ?> <configuration> <appSettings>
<add key="myKey" value = "123"/>
</appSettings> </configu…

Clearcase check in/uncheck out all the checked out files script

I am so used to source safe recursive check in and found troublesome in clearcase having to do it manually one by one.

This is the Unix script that I have come out with

//for undo check out all the checked out files
cleartool lsco -cview -avobs | cleartool unco -rm `awk '{ print $(5) }' | sed -e 's/^\"*//' -e 's/ *\"$//'`
//for check in all the checked out files
cleartool lsco -cview -avobs | cleartool ci -nc `awk '{ print $(5) }' | sed -e 's/^\"*//' -e 's/ *\"$//'`


//Using xargs

cleartool lsco -cview -avobs -short | xargs cleartool ci

Simple Test Unix C++ Source Compilation and Makefile

Create 3 (*.C) files


/* main.C */
#include <stdlib.h>
#include <stdio.h>
#include "1.h"

extern void test2();
extern void test3();

void test1()
{
}

int main()
{

test1();
test2();
test3();
exit (EXIT_SUCCESS);
}

/* 2.C */
#include "1.h"
#include "2.h"

void test2() {
}
/* 3.C */
#include "2.h"
#include "3.h"
void test3() {
}

Create 3 (*.h) files
touch 1.h
touch 2.h
touch 3.h

Then,

Create a makefile with content (note: <tab> should be a real tab. Tab is very important or else you will else funny compiler message)



testing123: main.o 2.o 3.o
<tab>g++ -o myapp main.o 2.o 3.o
main.o: main.C 1.h
<tab>g++ -c main.C

2.o: 2.C 1.h 2.h
<tab>g++ -c 2.C

3.o: 3.C 2.h 3.h
<tab>g++ -c 3.C

Then run

make -f makefile

then

export LD_LIBRARY_PATH=${LD_LIBRARY_PATH}:/apps/public/lib

(for C++ libraries since g++ is to compile CPP files)

Then, just run "testing123"

(note: In Unix, *. a is a static library where as *.so or *.sa is a shared library or dynamic…

Recover from C++ istream failure sample

The code is not coded in a standard way where it would altogether avoid the problem but does exhibit the recover from C++ istream failure which occur in a while loop.


void main_menu(){
int condition = 1;
int input = 0;

do {
cout << "please input an integer\n";
if(cin.fail()) {
//if it encounter a fail state which is error type. it will ignore the buffer
//associate with istream
cin.ignore(100);
cin.clear();
//reset the fail state to be good
}

cin >> input;
fflush(stdin); //fflush alone not suffice for some reason thou it works on scanf
if (input == 1) {
cout << "Hello World\n";
condition=0;
system("Pause");
} else { condition=1; }
}
while (condition == 1 );

}

Using Cygwin as XServer and putty as terminal client.

Firsly, install Cygwin with XServer.

Then, start your xserver in the cygwin bash shell by typing "startx &" so that you will have an additional xterm for configuration or
xwin -broadcast to start a broadcast XDMCP session instead.

Then, after started xserver, it will pop a xwindow client.

In your xwindow client (normally xterm), authenticate (if required) any client that
attempt to connect to your server by typing in

xhost + < IP / hostname >

(note: if hostname unresolved, add it in at /usr/hosts. Also to identify if your client
having authentication problem. Normally, your client will get error message like

authentication error - Xlib: Invalid MIT-MAGIC-COOKIE-1 key
)



Then,

you would need to configure your putty session so that it would forward X11 to Xserver, this can be done so by going to

Connection - SSH - X11- Tick Enable X11 Forwarding
And key in
X-Display Location as "localhost:0" (note, assuming your xserver is running at localhost)

Then, start your configured s…