Re: how does wrapper class works? - C# Discussion Boards

Christian Graus15-Oct-07 23:22

15-Oct-07 23:22

People who are obsessed with the rating system on this site will answer a question like this. I care more about helping people who want to learn, and the best way I can do that, is to show you how trivially you could have got far more detailed help than you'll get from a forum response, by typing some obvious keywords into google.

That I'm not trying to co-erce a 5 vote out of you doesn't mean I'm not the one who has your best interests at heart.

Christian Graus - Microsoft MVP - C++

"I am working on a project that will convert a FORTRAN code to corresponding C++ code.I am not aware of FORTRAN syntax" ( spotted in the C++/CLI forum )

Re: how to send a file by SMTP or POP3

Pete O'Hanlon15-Oct-07 23:27

Pete O'Hanlon

15-Oct-07 23:27

Christian Graus wrote:
That I'm not trying to co-erce a 5 vote out of you doesn't mean I'm not the one who has your best interests at heart.

Good answer. It coerced my 5.;)

Deja View - the feeling that you've seen this post before.

Re: how to send a file by SMTP or POP3

Christian Graus16-Oct-07 0:01

Christian Graus

16-Oct-07 0:01

*grin*

Christian Graus - Microsoft MVP - C++

"I am working on a project that will convert a FORTRAN code to corresponding C++ code.I am not aware of FORTRAN syntax" ( spotted in the C++/CLI forum )

Re: how to send a file by SMTP or POP3

kkun15-Oct-07 23:17

kkun

15-Oct-07 23:17

//but without any openDilogFile for choosing file
like this below ,using javascript ,not C#,
html:

<a href="#" onclick="javascript:oEdit.Upload();void(0)">附件</a> |<br />
<input type="file" id="oFile" onchange="javascript:oEdit.OnFileLoad();void(0)" class="hidden" />

js:

//附件<br />
function Upload(){<br />
    var oEdit = eval(this.ObjUpload);<br />
    oEdit.click();<br />
}<br />
//上传文件<br />
function OnFileLoad()<br />
{<br />
    var oFile = eval(this.ObjUpload);//max 61<br />
    var oFileName = oFile.value.substring(oFile.value.lastIndexOf(".")+1,oFile.value.length);<br />
    if( oFileName.toLowerCase() != "txt" &&<br />
        oFileName.toLowerCase() != "text" &&//-文本文件<br />
        oFileName.toLowerCase() != "rar" &&<br />
        oFileName.toLowerCase() != "zip" &&//-压缩文件<br />
        oFileName.toLowerCase() != "bmp" &&<br />
        oFileName.toLowerCase() != "jpg" &&//-图片文件<br />
        oFileName.toLowerCase() != "jpeg" &&<br />
        oFileName.toLowerCase() != "gif" &&<br />
        oFileName.toLowerCase() != "png" )<br />
        {<br />
            this.ObjUploadFile.innerHTML = "<img src=\"Images/oFile.gif\" alt=\"附件\" /> 不允许上传的文件类型![ " + oFileName + " ]";<br />
            return ;<br />
        }<br />
        this.ObjUploadFile.innerHTML = "<img src=\"Images/oFile.gif\" alt=\"附件\" /> " + oFile.value;<br />
}

how does wrapper class works?

cyn815-Oct-07 21:56

cyn8

15-Oct-07 21:56

Hi,
can anyone explain with example(if can) what is a wrapper class? From my basic understanding, u can use it in order to enable reusability and also if in case in the future, there is a better class, u can just replace it with the new one. However, i'm not quite sure how it works.
Thanks for any reply.

Re: how does wrapper class works?

Chaitanya Joshi15-Oct-07 22:15

Chaitanya Joshi

15-Oct-07 22:15

Wrapper class is an avtivity of migrating non OO types in languages in OO types i.e. in case of C# from basic value types (excepting structs, enums) to class types.

If this is somewhat difficult to consume consider following example.

Say you have one 'int' value which you want to wrap. So you would write a class like:

public class Integer<br />
{<br />
    private int var;<br />
<br />
    public Integer(int v)<br />
    {<br />
        this.var = v;<br />
    }<br />
<br />
    public get(){...}<br />
    public set(){...}<br />
}

So now you have wrapped a simple integer into a class Integer which will be an OO type. Fortunately they are directly available in C# libraries.

Now a millon dollar question. What is use of this??

See, when you are going to deal with something which requires complete OO types e.g. object serialization, remoting you need this concept. As the complete manifest information is required in order to perform the activity.
That is it.

Chaitanya Joshi

Re: how does wrapper class works?

Christian Graus15-Oct-07 22:30

Christian Graus

15-Oct-07 22:30

No, a wrapper class is typically a class that exists solely to import and expose functionality that is otherwise not available. For example, my article on using the Canon SDK in C# is a wrapper class, the class exposes methods which call the methods in the Canon SDK dlls, via p/invoke. My classes are a wrapper, I do not offer Canon camera connection, simply a way to call a C++ SDK from C#.

Christian Graus - Microsoft MVP - C++

"I am working on a project that will convert a FORTRAN code to corresponding C++ code.I am not aware of FORTRAN syntax" ( spotted in the C++/CLI forum )

Re: how does wrapper class works?

il_masacratore15-Oct-07 22:43

il_masacratore

15-Oct-07 22:43

I try to explain you my view,

A wrapper class enables reusability because you add an "interface" beetween implementation code and the use of it. If it's well designed, you can change implementation and its impact on use is minimal. If not, you will have to do a lot of changes in use code.

Visit my blog at http://dotnetforeveryone.blogspot.com/

static function or variable

Sonia Gupta15-Oct-07 21:36

Sonia Gupta

15-Oct-07 21:36

y should somebody declare the function or variable as static.what's the advantage

Soniagupta1@yahoo.co.in
Yahoo Messenger Id = soniagupta1

Re: static function or variable

Giorgi Dalakishvili15-Oct-07 21:44

Giorgi Dalakishvili

15-Oct-07 21:44

Have a look at this link: Static Keyword Demystified[^]

#region signature
my articles
#endregion

Re: static function or variable

Andrei Ungureanu15-Oct-07 21:44

Andrei Ungureanu

15-Oct-07 21:44

If you have a static function or variable you do not need to create an object to have access to that function/variable

class X
{
 public string nonStatic = "hh";
 public static string staticVariable = "xx";

 public void NonStaticFunction()
 {
  .. 
 }

 public static void StaticFunction()
 {
  ... 
 }
}

To have access to nonStatic variable and NonStaticFunction you have to write something like this

X obj = new X();
obj.nonStatic; //get the nonstatic variable
obj.NonStaticFunction(); //call the nonstatic function

To access the static variable and function you have to write code like this

X.staticVariable; //you call the static variable using the class name; no object required
X.StaticFunction; //call the static function

Hope it helps.

There are 10 kinds of people: those who understand binary and those who don't

Re: static function or variable

Sonia Gupta15-Oct-07 21:50

Sonia Gupta

15-Oct-07 21:50

Nice Understanding of Binary Digits.Well Thanks.U know something about this problem?Please click this line...]

Soniagupta1@yahoo.co.in
Yahoo Messenger Id = soniagupta1

comparing databases and update

Narayana Ayyagari15-Oct-07 21:35

Narayana Ayyagari

15-Oct-07 21:35

Hi All,

I wan't to compare two SQL Server databases. i.e., I wan't to check both databases structure and add if necessary.

In my project I am using SQL Express database and now we update some fields in the database. So, if we wan't to update the new versions for those customers who are using old database we need to update the database also. It is not recommanded that to manually add the fields in the database and is time taking too. So, I wan't to compare two databases(old and new) and update the fields in the old database.

Any confusion in my question plz let me know so that I can be more clear.

Thanks for any reply,

Narayana Ayyagari.

Re: comparing databases and update

leppie16-Oct-07 2:40

leppie

16-Oct-07 2:40

There are several commercial packages that does this very well, no free ones I know of. In SQL2005 you can try what is suggested here: http://blogs.geekdojo.net/richard/archive/2007/06/04/134600.aspx[^]

xacc.ide

The rule of three: "The first time you notice something that might repeat, don't generalize it. The second time the situation occurs, develop in a similar fashion -- possibly even copy/paste -- but don't generalize yet. On the third time, look to generalize the approach."

simple question

Trustapple15-Oct-07 21:34

Trustapple

15-Oct-07 21:34

hi ,
this may sound very stupid but i want some body to explain to me what is the difference between

public static void Main()
{
}

AND

public void Main()
{
}

what is the purpose of using void in the main function ie anyway a main function doesnot have to return any values right Big Grin | :-D

expecting a reply at the earliest

j

Re: simple question

Andrei Ungureanu15-Oct-07 21:39

Andrei Ungureanu

15-Oct-07 21:39

Trustapple wrote:

expecting a reply at the earliest

Read this [^] article.

Trustapple wrote:
what is the purpose of using void in the main function ie anyway a main function doesnot have to return any values

You use void to let the compiler know that the function doesn't return any values.

There are 10 kinds of people: those who understand binary and those who don't

Re: simple question

Sandeep Kumar16-Oct-07 0:48

Sandeep Kumar

16-Oct-07 0:48

Hi..

Trustapple wrote:
public static void Main()

public: It means that this method can be accessed from anywhere....

static: without creating the object of this class we can call the methos directly by using its class name...

void: As this main method is a function it should return something so we specifying void which means that it will not return any value...

main: it is a function name where the program starts executing...you can call this function from any other functions tooo like....

public void callMain()
{
main();
}

Regards,
Sandeep Kumar.V

MAPI Programming

M. J. Jaya Chitra15-Oct-07 21:29

M. J. Jaya Chitra

15-Oct-07 21:29

I have searched Code project for the articles for programming using MAPI.

But I couldn't find a solution for it.

Can any one give the link or the suggestions to program using Extended MAPI in .NET.

Thanks a lot in advance.

Best Regards,
M. J. Jaya Chitra

Re: MAPI Programming

Andrei Ungureanu15-Oct-07 21:35

Andrei Ungureanu

15-Oct-07 21:35

Try this article [^]

Hope it helps.

There are 10 kinds of people: those who understand binary and those who don't

I need help

Ehsan_MF15-Oct-07 21:16

Ehsan_MF

15-Oct-07 21:16

Hello
Any body know how can I define a const table like this in c#

-----------+------------+--------------+---------------
int_number | int_number | float_number | bool_variable
int_number | int_number | float_number | bool_variable
int_number | int_number | float_number | bool_variable
...

thanks

Beginner in C#

Re: I need help

Nissim Salomon15-Oct-07 22:21

Nissim Salomon

15-Oct-07 22:21

Hi
try the follwing link:
http://www.google.com/search?hl=en&q=Multi+Dimension+Arrays+c%23[^]

Re: I need help

Guffa15-Oct-07 22:35

Guffa

15-Oct-07 22:35

What do you mean by a "const table"?

Constants can only be simple values, like a number or a string. You can's create collecions of objects as constant.

---
single minded; short sighted; long gone;

Unable to open comport3

Srinu.D15-Oct-07 21:15

Srinu.D

15-Oct-07 21:15

I done the rs232 application.Executing is successfully.But showing Unable to open comport.In my application i have open the comport.

Accessing Excel Files using C#

anu91415-Oct-07 21:04

anu914

15-Oct-07 21:04

I want to write data received from serial COM port to an Excel data base. I'm really confused abt how to use it. If sumone can help me it'll be really appreciated.

Thank you

Re: Accessing Excel Files using C#

Andrei Ungureanu15-Oct-07 21:09

Andrei Ungureanu

15-Oct-07 21:09

There are several ways to do this. One is presented here [^] which uses Microsoft Excel Object Library. You can also try writing to a CSV file, which is easier, and Excel knows how to open these kind of files or you can try using OleDB or ODBC. You can find the connection string here [^], and if you search on google you will find several tutorials and applications.

Hope it helps.

There are 10 kinds of people: those who understand binary and those who don't

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