Re: Get the value of a field in a row - C# Discussion Boards

working with datagrids in Windows Forms [modified]

Rocky#22-Jul-06 2:28

22-Jul-06 2:28

well I just wanted to know, Can u place another datagrid inside one datagrid. I'm talking abt System.Windows.Forms here.

the other thing is that I wanted to do that bcz I wanted to display and receive data for a sales form. It has dat comming from 5 related tables. I had this idea but can any one of u give me some better idea of making a v user friendly interface. the tables are Prodline, prodmodel, Bill, purchase and customer.

Its basically for a coomputer shop. Can Anyone help?

I'm working in .net 1.1 mind u

-- modified at 8:40 Saturday 22nd July, 2006

Re: working with datagrids in Windows Forms

Igor Sukhov22-Jul-06 5:43

Igor Sukhov

22-Jul-06 5:43

Why do you need "nested datagrids" at the first place ? Believe me, users hates anything that doesn't not comply with their expectations and giving them that kind of interface won't take you to the right place.

Instead of creating a mess from the five tables on the one form I would consider adding a buttons/hyperlinks inside of the data rows. Clicking on particular button user navigates to the new form (or opens a e.g. combobox) with the data from linked table (prodline, prodmodel, etc).

Best regards,

-----------
Igor Sukhovhttp://sukhov.net

Re: working with datagrids in Windows Forms

Rocky#23-Jul-06 9:56

Rocky#

23-Jul-06 9:56

Many thanks. I was also thinking on almost teh same lines but can u tell me if we can make combo boxed inside of datagrid column.

Re: working with datagrids in Windows Forms

Igor Sukhov23-Jul-06 13:59

Igor Sukhov

23-Jul-06 13:59

To put a combo box into a datagrid you should specify that particular columns (which
you'd like to be combobox-enabled) should be created using the DataGridComboBoxColumnStyle.

Best regards,

-----------
Igor Sukhovhttp://sukhov.net

Re: working with datagrids in Windows Forms

Rocky#23-Jul-06 21:14

Rocky#

23-Jul-06 21:14

well I'm working in .Net version 1.1 which I think doesnt have anything such as DataGridComboBoxColumnStyle so what can I do now...

Get the value of a field in a row

Glen Harvy22-Jul-06 2:26

Glen Harvy

22-Jul-06 2:26

Hi,

I want to put the value of a column from a row in a datatable where I know the row number ie

string CName = [row=1, column=Names in datatable=dtClubs]

What goes into the [ .....] part?

TIA

Glen Harvy

Re: Get the value of a field in a row

albCode22-Jul-06 2:34

albCode

22-Jul-06 2:34

DataSet dsTemp = new DataSet(); <br />
DataTable Tables = new DataTable(); <br />
dsTemp.Tables.Add(Tables);<br />
string data =   dsTemp.Tables[0].Rows[0][0].ToString();

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...

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