Returning unicode string through function argument.

Hi all,
I have following function written in a C++ dll. I need to be able to call it from Java using JNI. This function expects to receive a buffer pointed by wchar_t * of "int len" length. It will copy write some text in to this buffer and i need to be able to get this updated Unicode string in Java code. please let me know how to write Java code to call this function.
int getWString(wchar *ch, int len)
wcsncpy( ch, L"Hello unicode world", len);
return 1; // no error
}Best Regards
Noman Khan

You can't.
You have to write some C "wrapper" code that meets the java interface, and have it call the C function and handle the return.
Java doesn't do output parameters, especially wchar_t* s.

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<cfcomponent displayname="Country object" hint="This is a Country object, it allows you to access and set values in the Country.">

<cfset this.objFunctions = CreateObject( 'component', 'nec.com.system.functions' )>
<cfscript>
this.idCountryID = 0;
this.sCountryName = "";
this.sISOCode = "";
this.sDHLCode = "";
this.iErrorID = "";
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<cffunction name="getID" displayname="Get ID" returntype="numeric" output="false" hint="This returns the ID of the current item.">
<cfreturn this.idCountryID>
</cffunction>
<cffunction name="getsCountryName" displayname="Get sCountryName" returntype="string" output="false" hint="This gets the sCountryName value of this item.">
<cfreturn this.sCountryName>
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<cffunction name="getsISOCode" displayname="Get sISOCode" returntype="string" output="false" hint="This gets the sISOCode value of this item.">
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<cffunction name="getsDHLCode" displayname="Get sDHLCode" returntype="string" output="false" hint="This gets the sDHLCode value of this item.">
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<cffunction name="iError" displayname="Get iError" returntype="numeric" output="false" hint="This returns the iError of the current item.">
<cfreturn this.iError>
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<cffunction name="setID" displayname="Set ID" returntype="boolean" output="false" hint="This sets the ID value of this item.">
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<cfset this.idCountryID = arguments.idCountryID>
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<cfscript>
objDS = CreateObject("component","nec.com.system.settings");
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<cftry>
 <cfquery name="checkID" datasource="#sDatasource#">
 SELECT idCountryID
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<cfif not checkID.recordCount>
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<cffunction name="add" displayname="Add Country" returntype="numeric" output="false" hint="This adds a Country.">

<cftry>
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 FROM tblCountry
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 SET nocount off
 </cfquery>
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<cffunction name="update" displayname="Update Country" returntype="numeric" output="false" hint="This updates a Country record.">

<cftry>
 <cfquery name="checkUnique" datasource="#sDatasource#">
 SELECT idCountryID
 FROM tblCountry
 WHERE (sCountryName = '#this.objFunctions.scrubText(this.sCountryName)#'
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 AND idCountryID <> #this.idCountryID#
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 <cfcatch>
 <cfscript>
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 </cfscript>
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 </cfcatch>
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 <cfquery name="update" datasource="#sDatasource#">
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<cftry>
 <cfquery name="checkDependancies" datasource="#sDatasource#">
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 WHERE idCountry = #this.idCountryID#
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 <cfscript>
 objError = CreateObject("component","nec.com.system.errors");
 iErrorID = objError.addError("delete: checkDependancies: idCountry: #cfcatch.detail#");
 </cfscript>
 <cfreturn iErrorID>
 </cfcatch>
</cftry>
<cfif checkDependancies.recordCount>
 <cfscript>
 objError = CreateObject("component","nec.com.system.errors");
 iErrorID = objError.addError("That Country is being used by an address, delete failed.");
 </cfscript>
 <cfreturn iErrorID>
</cfif>

<cftry>
 <cfquery name="delete" datasource="#sDatasource#">
 DELETE FROM tblCountry
 WHERE idCountryID = #this.idCountryID#
 </cfquery>
 <cfcatch>
 <cfscript>
 objError = CreateObject("component","nec.com.system.errors");
 iErrorID = objError.addError("delete: delete: #cfcatch.detail#");
 </cfscript>
 <cfreturn iErrorID>
 </cfcatch>
</cftry>
<cfreturn this.idCountryID>
</cffunction>
</cfcomponent>

Unicode(String) to actual Unicode !

Hi, i have an unicode data which is retrieved from database, the unicode is in String format(\u4eba\u53c2), how to make it to be actual unicode "\u4eba\u53c2". i have a problem where the unicode from database doesn't give me the actual character but the unicode string itself. Please comment on it . Thanks.
_calv

Hi Calv,
I'm pretty sure that the conversion from the ASCII string to Unicode is not available within the API. (If someone knows otherwise please jump in). However it should be fairly easy for you to program this conversion: for example, you could parse your string into the six character substrings that represent characters, strip off the \u, and then cast the sixteen bit integer into a Character.
In case it's helpful, I am pasting a couple of methods I wrote to go in the opposite direction:
returns a (ASCII) string that represents the specified character by a unicode escape sequence
static public String toUnicodeString( char character) {
 short unicode = (short) character;
 char hexDigit[] = {
 '0', '1', '2', '3', '4', '5', '6', '7',
 '8', '9', 'a', 'b', 'c', 'd', 'e', 'f'
 char[] array = {hexDigit[( unicode >> 12) & 0x0f],hexDigit[( unicode >> 8) & 0x0f],
 hexDigit[( unicode >> 4) & 0x0f], hexDigit[ unicode & 0x0f] };
String result = new String ("\\u" + new String (array));
 return result;
returns a (ASCII) string representing the java string argument:
e.g. -> "\u1234\u5678"
static public String toUnicodeString( String string) {
 String result = "\"";
 for (int index = 0; index < string.length (); index++) {
 result = result + toUnicodeString (string.charAt (index));
 result = result + "\"";
 return result;
} Regards,
Joe

Bypassing function argument without changing default value

Hi there
I’m having some problems understanding how I can bypass function arguments without changing its default value. Here are some examples:
function myFunction ( arg1:Boolean, arg2:String="default string", arg3:Number=3 ):Array
    return new Array (arg1, arg2, arg3);
trace(myFunction(true, "new string", 5));
// true,new string,5
trace(myFunction(true, undefined, 5));
// true,,5
trace(myFunction(true, null, 5));
// true,,5
trace(myFunction(true));
// true,default string,3
trace(myFunction(true, null));
// true,,3
My question is: Shouldn't I be able to call a function bypass the second argument (that has a default value), change third argument and on result second argument maintains its default value?
Example:
trace(myFunction(true, null, 5));
// not desired: true,,5
// desired: true,default string,5
I know that applying a defult value to the argument allows one to bypass it. But it will always be redefined or to null or to undefined. At the moment I only see one solution.
function myFunction ( arg1:Boolean, arg2:String="default string", arg3:Number=3 ):Array
     if (!arg2)arg2 = "deafult string";
     return new Array (arg1, arg2, arg3);
It just seems like too much code repeated
Regards

Hi dmennenoh,
Yup, this was just an example to show that the use of a default value only helps you to bypass the need to simulate a MouseEvent Object for an onRollOver MouseEvent argument. Other than that you can never bypass it without changing its value. You must always apply a null or undefined value and work with that.
Thanks anyway

Javascript function arguments

When using JavasScript code in ASP on Sun's server I have encountered a strange problem:-
Simple code to illustrate is
<%
function myClass()
this.myMethod=myClass_myMethod;
function myClass_myMethod(nNumber)
return nNumber+1;
var oObject=new myClass();
var nValue=oObject.myMethod(2);
%>
I am finding that the interpreter is not able to access the argument nNumber by name in myMethod.
Instead I have to use:
function myClass_myMethod()
var nNumber=myClass_myMethod.arguments[0];
return nNumber+1;
Any clues? Is it because the script is enclose in <% %> and not <SCRIPT runat=server> tags.

Hello,
Well this is more a pure javascript question than a HTML DB you should ask google.
But it depends what you are doing with your function, if each value is a specific variable then no your function will have to look like f(nul,null,null,1,null,null,null,.........) .
If you are using them to populate an js array you can iterate through your arguments or just provide the array are your argument.
Personally and I do know a little about javascript I would avoid like the plague any js function that requires 50 arguments ( i usally start looking at a different solution at abut 10 arguments) especially if most of them could be null, there absolutely has to be a better way to do it.
Like breaking up into smaller more specific functions or creating a js object that is more robust, agian you should ask google.
Carl

Returning unicode string through function argument.

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