C# Discussion Boards - CodeProject

Two problems about image processing in Pocket PC

5-May-05 20:14

Hi,
Bit of a coincidence, I was just checking out usb stuff
at http://www.icsharpcode.com
check it out might be useful.

HTH Big Grin | :-D

Web design and hosting
http://www.kayess.com.au

redleafong5-May-05 18:33

redleafong

5-May-05 18:33

Thanks for your attention. Big Grin | :-D

Currently I am working on a image processing program for PPC (using C#), yet there are two problems remained to be solved:
1. Confused | :confused:

Rotating an image. Compact framework doesn't support the methods such as "Image.RotateFlip" or "Graphics.DrawImage(Image, Point[])", so I need to implement the rotation function completely by manually coding. Therefore I need an algorithm, which doesn't invoke any special system-provided method, to perform image rotation.
2. Confused | :confused:

Saving an image. The compact framework doesn't support the Image.Save method, so I have to find another way to save a Bitmap object into a JPEG file.

Any kind of help will be greatly appreciated. Thanks. Big Grin | :-D

Re: Two problems about image processing in Pocket PC

Andrew Kirillov5-May-05 18:48

Andrew Kirillov

5-May-05 18:48

Answering your first question

There are some image processing libraries on CodeProject, try to look at their sources.

You can try to research CxImage [^], there is an implementation of image rotation. Or you can try this one [^], written on C#.

clipping video using DirectShow in C#

5-May-05 18:28

Hi,
I am trying to grab a video clip from a movie in C# using DirectShow. I am using DirectShowNet project which I got from codeproject.com.It is working well when i am using devices like web cam etc .

I am getting problem in playing a movie which is stored on hard disk and capturing video clip from it.

An Exception is raised when SetupGraph() function is invoked from
RenderStream() function "Invalid Parameter".

I had used FilterCategory.LegacyAmFilterCategory as first argument to
DsDev.GetDevicesOfCat() function.And from the list of devices displayed by DeviceSelector class I am selecting 'File Source(async)'

DataGrid Cell Edit

Kayess Tech5-May-05 18:16

5-May-05 18:16

Hi guys and gals,

I have a windows form with a DateTimePicker and a DataGrid. What I would
like to do is double-click a cell in the DataGrid and have that cell
update to show the date that is selected by the DateTimePicker.
Any suggestions as to how I could do this?

TIA
Steve

Web design and hosting
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Polis Pilavas6-May-05 0:32

6-May-05 0:32

Perhaps you could even embed the DateTimePicker in the DataColumn, so that whenever you click on a cell it drops down so that you can select a date and automatically updates itself. Have a look here[^].

Regards,
Polis

Can you practice what you teach?

Kayess Tech6-May-05 0:34

6-May-05 0:34

Thanks Polis, but that's not what the boss wants I'm afraid.

Web design and hosting
http://www.kayess.com.au

Polis Pilavas6-May-05 1:15

6-May-05 1:15

In that case, here's what I think.

1. First of all, in order for you to be able to handle the cell you click you have to get the current row by writing something like:

//Get current row
CurrencyManager <code>xCM</code>= (CurrencyManager)this.dataGrid2.BindingContext[this.dataGrid2.DataSource, this.dataGrid2.DataMember];
DataRowView <code>xDRV</code>= (DataRowView)xCM.Current;
DataRow <code>currRow</code>= xDRV.Row;

2. Then you move on by specifying that you wish to respond only to mouse-clicks that fall between a cell's range:

System.Drawing.Point <code>point</code>= new Point(e.X, e.Y);
DataGrid.HitTestInfo <code>info</code>= this.dataGrid2.HitTest(point);
if(info.Type == DataGrid.HitTestType.Cell)
{
	// Do your thing... e.g.
        currRow[myDataTable.Columns["Date"]] = this.dateTimePicker1.Value.ToShortDateString();
}

A piece of note here. In order to be able to get the your new point from e.X and e.Y, you will have to write the code in a relevant event (such as your dataGrid's mouseUp event)

Something important: The actual change will not take part on the dataGrid itself but on the DataRow of the table that the dataGrid is bound to. By changing the column of your bound table, the value on the dataGrid's cell will automatically change

Hope this pleases the boss

Regards,
Polis

Can you practice what you teach?

Kayess Tech6-May-05 1:27

6-May-05 1:27

Thank you Polis,
you are my hero Big Grin | :-D

now if I do a
if(e.Clicks == 2)
in the MouseUp Event that will handle the
double-click.

Cheers

Steve

Web design and hosting
http://www.kayess.com.au

Polis Pilavas6-May-05 1:38

6-May-05 1:38

Glad I could help Steve

Regards,
Polis

Can you practice what you teach?

web service

skrishnasarma5-May-05 17:57

skrishnasarma

5-May-05 17:57

Hi

I am sending some data from one win form application to a database in the remote machine through a web service running in the remote machine.
My requirement is first I have to find out that either the machine (Win form application running machine) is connected to the network or not?

If the machine is connected to the network I have to send the data to the remote machine else I have to store the data locally.
Could any one tell how to detect weather the web service is running in the remote machine or not?

Could any one through some inputs on this ?

Regards
Subbu.

Re: web service

Dan_P5-May-05 18:29

Dan_P

5-May-05 18:29

The client proxy class will throw a WebException if it can't connect to the service.

Re: web service

skrishnasarma5-May-05 19:46

skrishnasarma

5-May-05 19:46

Hi Dan Thanks for your reply.

ADO.NET

Dharma Dassanayake5-May-05 16:17

Dharma Dassanayake

5-May-05 16:17

Look at the following snippet of code. By pressing button1 invokes AddRow() method intending to add a row to the table (say Customers). When run it there won't be any erros but physically it hasn't added any row to the customers table. What's wrong with that. Anybody could suggest?

Thanks

***********************************************************************
public static void AddRow(DataTable myDataTable)
{
DataRow myNewDataRow = myDataTable.NewRow();
myNewDataRow["CustomerID"] = "T1Com";
myNewDataRow["CompanyName"]= "My Company Name";

myDataTable.Rows.Add(myNewDataRow);

myDataTable.AcceptChanges();
}

private void button2_Click(object sender, System.EventArgs e)
{
OleDbConnection conn = new OleDbConnection(@"provider=Microsoft.Jet.OLEDB.4.0;Data Source=C:\Temp\orders.mdb;User ID=;Password=;");
string selectString = "SELECT CustomerID, CompanyName "+
"FROM Customers ";

OleDbCommand cmd = conn.CreateCommand();
cmd.CommandText = selectString;

OleDbDataAdapter dAdapt = new OleDbDataAdapter();

dAdapt.SelectCommand = cmd;

DataSet dSet = new DataSet();

conn.Open();

dAdapt.Fill(dSet,"Customers");

DataTable dTable = dSet.Tables["Customers"];
AddRow(dTable);

conn.Close();
}
************************************************************************

Polis Pilavas6-May-05 0:36

6-May-05 0:36

Do you update your dataset with the new changes after you update the the "Customers" table?

Regards,
Polis

Can you practice what you teach?

Dharma Dassanayake6-May-05 19:43

Dharma Dassanayake

6-May-05 19:43

Thanks Polis. Not.

Because I feel AcceptChanges() method calls the UpDate() method.

However just now I added ** dAdapt.Update(dSet,"Customers"); ** statement into Button2_Click() function just after ** AddRow(dTable); **.
Now it looks like below.
AddRow(dTable);
dAdapt.Update(dSet,"Customers");

Still it is not writing to the table.

(Indeed I am using another way of inserting data to the table but wish to discuss and know why is it not working in this way.)

Thanks.

Polis Pilavas7-May-05 1:21

7-May-05 1:21

The thing is that the actual table "Customers" has nothing to do with the dataTable dTable that you created. The dTable is just an object that you create in memory to hold the information of the "Customers" table. By adding a new row in it, it does not mean that you add a new row into your actual physically stored "Customers" table.

In your code, currently you add a new row into your dataTable object but you still update the dataAdapter with the "Customers" which is unchanged (since the new row was added in the dTable).

One way to achieve what I mean is:
1. Keep the addition of the new row into the dataTable dTable
2. Copy the dTable info back to the "customers" table
3. Update your dataset

Hope this helps

Regards,
Polis

Can you practice what you teach?

Dharma Dassanayake7-May-05 15:47

Dharma Dassanayake

7-May-05 15:47

Thanks Polis

Polis Pilavas8-May-05 1:34