Re: Converting string into byte[] - C# Discussion Boards

Re: Get the value of a field in a row

Glen Harvy22-Jul-06 3:02

Glen Harvy

22-Jul-06 3:02

Thanks for the prompt response Smile | :)

Given that the DataTable is named dtMyClub, the row number is 1, the Column is called "ClubName" and the value is "North Pony Club" then could you fill in the following for me please Poke tongue | ;-P

string data = " Confused | :confused:

"

Thanks.

Glen Harvy

Re: Get the value of a field in a row [modified]

albCode22-Jul-06 3:06

albCode

22-Jul-06 3:06

DataSet dsTemp = new DataSet();
DataTable dtMyClub= new DataTable();
dsTemp.Tables.Add(dtMyClub);
string data = dsTemp.Tables[0].Rows[0]["ClubName"].ToString();

//result
// string data = "North Ponly Club"

or can u set here ur piece code to see what are u want to do

-- modified at 9:06 Saturday 22nd July, 2006

Re: Get the value of a field in a row

Glen Harvy22-Jul-06 3:43

Glen Harvy

22-Jul-06 3:43

Thanks for the help.

I need to work out a couple of other things as well.

Glen Harvy

Converting string into byte[]

Mursil22-Jul-06 2:08

Mursil

22-Jul-06 2:08

Hi,

I am facing an odd problem. I have library class that fills up binary data in a string that is passed by ref to one of its function. The problem is when i convert the data into byte[] using the function System.Text.Encoding.Uncode.GetBytes();

I dont get the actual binary data which the library program has given to me.
I checked the length of the string before converting it into byte and it was the same as was sent by the library program. But when i convert it into byte[], not only the size is different but also the data is changed. I think some of the characters in the data are not valid Unicode data.

Is there any othe method which can give me the raw byte[] without applying any encoding scheme.

Like: byte[] GetByteData(string strData);

Regards
-Mursil

Take a very good care of Yourself.
Sayed Ahmad Mursil

Re: Converting string into byte[]

Nader Elshehabi22-Jul-06 2:16

Nader Elshehabi

22-Jul-06 2:16

Hello

There are more encoders than just Unicode. Did you try them?? Including Encoding.Default

You wouldn't want to put your string in a for loop and read it byte by byte, would you?

Regards Rose | [Rose]

Re: Converting string into byte[]

Mursil22-Jul-06 2:21

Mursil

22-Jul-06 2:21

I have tried this method also.
But Encoding.Default basically returns Unicode encoding reference by default.

so it doesnot server the purpose.
Smile | :)

Is there any open source library for other encoders.?
i.e which doesnt encode any thing. Just give me the exact byte[] stored in the string.???

Take a very good care of Yourself.
Sayed Ahmad Mursil

Re: Converting string into byte[]

Nader Elshehabi22-Jul-06 2:31

Nader Elshehabi

22-Jul-06 2:31

Hello

How would anybody know how your library is storing the bytes? I mean if you have byte sequence 1,2,3,4 It culd be stored as:

01, 02, 03, 04

or

01, 00, 02, 00, 03, 00, 04, 00

Or for whatever it's worth it, it could be comma delimited (Dec for comma is 39):

01, 39, 02, 39, 03, 39, 04, 39

It depends mainly on your library, and how it fills the string.

Regards Rose | [Rose]

Re: Converting string into byte[]

Mursil22-Jul-06 2:45

Mursil

22-Jul-06 2:45

You are absolutely right.
Actually the library program is a COM program. It captures an image and then send the image data to by filling the binary image data in the ref string. I am getting the complete data but when i try to get the bytes out of the string, it is not the same as those transmitted by the library program.
( I have already done logging at both ends to compare the binary data. Also i have a lmitation that i cannot change the interface of my library program).

I am sure that the raw image data doesnot follow any of the encoding shceme you have mentioned. The last option for me is to encode the data in the library before sending it to the main application. But this is the last thing i wana do bcz it will almost doubles the size of the data.

So I am looking for an alternative solution in this regard that can work without
encoding the image.

Thanx for your time and support...
Regards..

Re: Converting string into byte[]

Nader Elshehabi22-Jul-06 4:35

Nader Elshehabi

22-Jul-06 4:35

Hello

Mursil wrote:
last option for me is to encode the data in the library before sending it to the main application

Wait a minute!! Should I understand from this that you wrote that library?? If so, why not passing the data as a bytes array from the begining?

Mursil wrote:
It captures an image and then send the image data to by filling the binary image data in the ref string

If it's a 3rd party library and this is what it does. Why can't I see anything special about it?? Confused | :confused:

I mean you can capture an image from the screen as easy as one method: Graphics.CopyFromScreen(), if you are capturing from a camera or a scanner, then maybe the problem is in the library?? How did you know that the data sent by the library is valid?

Regards Rose | [Rose]

How to add context menu handlers in registry for custom application, please help???

Waqas Nasir22-Jul-06 1:29

Waqas Nasir

22-Jul-06 1:29

Hi,

Just wanted to ask if any body knows how to add context menu handlers for your custom application, for example, if my application is registered with .abc then there are some verbs that I can set which will work on .abc file. What I am asking is that how to add context menus when the user clicks to any file extension, those menus should appear and then I can set the command parameter for those menus in registry to my own custom application... can any body help

Thanks in advance...

regards,

Waqas

Re: How to add context menu handlers in registry for custom application, please help???

BoneSoft22-Jul-06 5:41

BoneSoft

22-Jul-06 5:41

With a .Net deployment project, you can add new file types to the registry and specify their actions and what applications are invoked when used. But if you're looking to create your own context menu, that's beyond the scope of .Net, and I'm not sure what all you might have to do with the registry to accomplish that.

Try code model generation tools at BoneSoft.com.

Accessing other system using C#.net?

rohita22-Jul-06 1:07

rohita

22-Jul-06 1:07

hai all.
how to check whether a system is there in a particular network using C#.net... or how can i access a system in the netwaork using c#.

Regards

Re: Accessing other system using C#.net?

Rizwan Bashir22-Jul-06 3:43

Rizwan Bashir

22-Jul-06 3:43

what you want to access.
1. Any DB on other machine
2. Any web Service on other machine
3. Any Window service
4. Any remoting Object
5. Serialization
6. Operate other system
7. Extract folder information
8. Display like remote desktop
9. There are many more to go.. what you exactly wants ?

Rizwan Bashir

Re: Accessing other system using C#.net?

rohita23-Jul-06 19:52

rohita

23-Jul-06 19:52

hai..
i just want to extract shared folder information of remote system...

Regards

Determining if a file can be opened

Colin Angus Mackay22-Jul-06 1:03

Colin Angus Mackay

22-Jul-06 1:03

I'm looking for pointers to code or documentation that will allow me to determine if a file can be opened. I don't mean if the file exists (that is easy enough) but if the file can actually be opened.

I had thought about opening the file in exclusive mode then closing it again, but I don't really want to do that because it would throw an exception if the operation failed (which would at least tell me if it is possible) and I don't regard a failure as exceptional. So, I obviously don't want the overhead of throwing and catching an exception.

Scottish Developers events:
* .NET debugging, tracing and instrumentation by Duncan Edwards Jones and Code Coverage in .NET by Craig Murphy
* Developer Day Scotland: are you interested in speaking or attending?
My: Website | Blog

Re: Determining if a file can be opened

Not Active22-Jul-06 2:15

Not Active

22-Jul-06 2:15

As far as I know the only way is to actually try opening the file

only two letters away from being an asset

Call to unmanaged dll function

Aslam Bari22-Jul-06 0:36

Aslam Bari

22-Jul-06 0:36

Does anybody know what is the problem in the below code. The InPtr returned by the funcion is always 0 means null. Why?
////////////////
public class ThumbnailExtractor
{
[System.Security.SuppressUnmanagedCodeSecurity]
[DllImport("acdb17.dll", CallingConvention = CallingConvention.Cdecl,
EntryPoint = "?acdbGetPreviewBitmap@@YAPAUtagBITMAPINFO@@PB_W@Z")]
extern static private IntPtr acdbGetPreviewBitmap(string filename);

static Bitmap GetBitmapFromDwg(string filename)
{
return Marshaler.BitmapInfoToBitmap(acdbGetPreviewBitmap(filename));
}
public Bitmap GetImage(string filename)
{
return GetBitmapFromDwg(filename);
}
}
///////////////////
Thanks in advance

Re: Call to unmanaged dll function

mav.northwind23-Jul-06 4:04

mav.northwind

23-Jul-06 4:04

Not sure where this acdb17.dll is coming from, but the EntryPoint is looking really strange.
In most cases you can simply p/invoke functions from Win32 DLLs by just declaring the static method with the same name as the function in the DLL.
The EntryPoint attribute is only neccessary if you want to (or have to) name you function differently.
So I'd suggest trying:

[DllImport("acdb17.dll")]
extern static private IntPtr acdbGetPreviewBitmap(string filename);

Does it work then?

Regards,
mav

--
Black holes are the places where god divided by 0...

Search Results (Win Forms 2.0)

TAREQ F ABUZUHRI22-Jul-06 0:20

TAREQ F ABUZUHRI

22-Jul-06 0:20

Im building a Search facility and want to return a set of results (Done!)

The results are displayed in a GridView, but I want the user to click a row and then that client info will pop up in the text boxes:

a Sample:

string ConnectionString = "Data Source='db.sdf';";
SqlCeConnection connection = new SqlCeConnection(ConnectionString);
connection.Open();
string strLastName = textBox1.Text;
string strPostCode = textBox2.Text;
string strEmail = textBox3.Text;

if (!(textBox1.Text == null))
{

string SelectLastName = "SELECT OID, name, lastname, Postcode, Emailad FROM Eaddress WHERE lastname = '" + strLastName + "'";

SqlCeDataAdapter da = new SqlCeDataAdapter(SelectLastName, ConnectionString);
DataSet ds = new DataSet();
da.Fill(ds, "Eaddress");
dataGridView1.DataSource = ds;
dataGridView1.DataMember = "Eaddress";

}

i have two text boxes called textbox1 and textbox2, when user clicks the row the name appears in textbox and lastname appears in textbox2.

example would help very much!!

Palestine

Re: Search Results (Win Forms 2.0)

Sean8922-Jul-06 10:23

Sean89

22-Jul-06 10:23

Look up textbox databinding.

GetPathDependency

TAREQ F ABUZUHRI22-Jul-06 0:20

TAREQ F ABUZUHRI

22-Jul-06 0:20

Can someone explain this with an example of why you need it as part of your own implementation of the Virtual Path Provider class. I have read this over and over in MSDN and other articles and do not get what it's use is in a pratical example.

Palestine

Hypothetical situation that I wouldn't know exactly how to handle

TAREQ F ABUZUHRI22-Jul-06 0:19

TAREQ F ABUZUHRI

22-Jul-06 0:19

Hello,

I was thinking the other day about how I would solve the following problem, but I just couldn't seem to come up with a really logical solution... or at least what I would think is a best practice. How would you handle the following?

Say I have winform client apps... any number of them. Lets say that this app has a couple web services. Okay, now lets say that one of the web service is like a broker web service... it also contains other web services. The client isn't aware of all the web services the broker service is hitting, the broker is responsible for knowing that. The point here is that we have a web service which may hit another web service, could be anything. Now, here's the hard part... getting all of the errors in case one happens. So client requests data from Service1. Service one then hits Service2, Service3 and Service4. Service3 errors out because the server that it's on is down. Service4 errors out because of a database issue or something. I want to return something back to the client listing all of the details of why the transaction failed (like in a log file or something), like

Success: Transaction to Service1 was successful
Success: Transaction to Service2 was successful
Error: Could not access Service3.
Error: Duplicate Primary Keys in Service4.

How do I handle this? Lets take it to another level and say that Service2 in itself might contain other services, so the transaction to Service2 was successful, but the transaction to Service2a failed for some reason.

The trick is keeping a single log file that contains all of the details on why various services failed, even if those service contain services which may have failed for some reason. What's the best way to handle something like this? I can't have every method return a bool if it passes or fails because it might already have a return value... So I can't just call GetData on Service2 and return a bool whether it passed or failed because it might already return a dataset... Does this make sense?

Keep in mind this is hypothetical, but I am just wondering what the best practice is in handling this type of scenerio.

Thanks!

Palestine

Re: Hypothetical situation that I wouldn't know exactly how to handle

Nader Elshehabi22-Jul-06 2:24

Nader Elshehabi

22-Jul-06 2:24

Hello

In your scenario, I believe the best practice would be messages. Each message contains the sender info, and the error message. The protocole, or implementation is totally up to you. There are million ways to communicate between different applications and services.

Hints:
- You can return success/failure messages, or only failure messages.
- You can put your messages in a queue and check it periodically, or handle it promptly.
- You can send the error message in the service output, or send it in a private stream.

I hope this would throw some light

Regards Rose | [Rose]

Re: Hypothetical situation that I wouldn't know exactly how to handle

InOut.NET22-Jul-06 2:36

InOut.NET

22-Jul-06 2:36

I'd say instead of returning a bool type, return a object[] type. The elements in the object array can then be anything. Thus retuning a whole package of info regarding what had happend during the call to Service3. The return return object can tell you for example:
obj[0] : failed/success
obj[1] : error message
obj[2] : error code
obj[3] : some other usefull return

This obviously means that the size of the package returned might be big; in terms of bool bytes vs. object[] bytes.
i hope this helps.

How do I manage the checkonClick/uncheck on a menu item

TAREQ F ABUZUHRI22-Jul-06 0:18

TAREQ F ABUZUHRI

22-Jul-06 0:18

I have a View menu item that offiers Large Icon, Details..... views. I would like to have the menu item have a checked sign when selected by a user and then remove the check sign when user selects a different view option.

Thank you.

Palestine

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