C# Discussion Boards - CodeProject

convert raw image to bmp or jpeg

21-Feb-07 18:30

I thought the control gave you those for free ?

Christian Graus - Microsoft MVP - C++
Metal Musings - Rex and my new metal blog
"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 )

gskumar11121-Feb-07 18:21

gskumar111

21-Feb-07 18:21

hi all,
in my project i need to convert raw image to bmp or jpeg and i have some images with the extention .gry i dont know this is raw or any other special format but i am thinking this is a raw format so my problem is convert .gry image to bmp or jpeg in c#
so plz any one knows the way how to do it is plz tell me

thanks in advance

Regards,
santhosh

Christian Graus21-Feb-07 18:27

21-Feb-07 18:27

If you've got raw pixel data, you have a bmp, it just needs a header, assuming that it's word aligned, or that it has the right padding in it.

Where is the data coming from ?

gskumar11121-Feb-07 18:40

gskumar111

21-Feb-07 18:40

hi Christian Graus,
we have live scanner that will be creating these images into one folder so now my responsibility is reading that .gry images and displaying in the form in c# .

Regards,
santhosh

Christian Graus21-Feb-07 18:55

21-Feb-07 18:55

You can create a bitmap object from a stream, you could try and see if the class can make sense of the data. If not, you could read my image processing articles, build a bitmap of the right size, and pass the data across one scanline at a time.

V.21-Feb-07 22:29

21-Feb-07 22:29

Isn't a raw image different then a bmp?
If not why would Xp have a powertoy Raw Image Support[^]

V.
I found a living worth working for, but haven't found work worth living for.

Christian Graus22-Feb-07 8:54

calling a random number only once

22-Feb-07 8:54

Yes, it is, but a bitmap IS 'raw' pixel data, with a bitmap header.

alostdruid21-Feb-07 17:13

alostdruid

21-Feb-07 17:13

Im writing a test prep MDI program that calls random #s to select a question, im having a problem though i need it to only call those numbers once. A solution to this or something that will accomplish the same goal would be appreciated.

Re: calling a random number only once

Shajeel21-Feb-07 18:00

Shajeel

21-Feb-07 18:00

Use Hashtable to keep the record of these numbers and if they are repeated ignore them.

Regards
Shajeel

Re: calling a random number only once

Christian Graus21-Feb-07 18:26

How can I know what ChildNode is selected from TreeView? [modified]

21-Feb-07 18:26

Create a list that contains all the numbers you may want, in sequence. When you get a random number, make a number that is a valid index into that list. When a number is selected, grab it, and remove it from the list.

remoting

kalyan_241621-Feb-07 16:59

kalyan_2416

21-Feb-07 16:59

hi all
i have to do something on remotesystem ....
now my application is ready
the remote sys. is my local server..
and client is my webserver...

i did all my things in console and got its exe
these exe works well
but how do i use it on webserver....
or do i need to change into asp.net applications
if i need to change how should i proccedd
please help me thanks byebye

Khoramdin21-Feb-07 16:14

Khoramdin

21-Feb-07 16:14

Hello everyone,

I have created a Treeview which displays the DB server and Databases in the server.

I would like to add an extra option to my application. I would like the list of table to be open in another TextBox once a particular database is selected from the TreeView. If I am not mistaken I should use AfterSelect for this purpose. But I am not able to get the ChildNode name!

Could someone be kind enough to let me know how I can get this done or point me to some online code or tutorial?

As always, thank you very much for your help and have a great day.

Khoramdin

-- modified at 23:22 Wednesday 21st February, 2007

Re: How can I know what ChildNode is selected from TreeView?

Shajeel21-Feb-07 18:28

Shajeel

21-Feb-07 18:28

e.Node where e is the second argument of the event.

Regards
Shajeel

C# Question with Generics [modified]

malharone21-Feb-07 15:04

malharone

21-Feb-07 15:04

I have an object hierarchy where all of my objects in the application domain inherit from a base class. I also have a persistance layer which works using generics.

Looking at the code below, you realize that my object hierarchy is non-generic. But DBStore methods are genericised. How do I pass the type/class of current type?
e.g.

class DBStore
{
  public T CreateObject<T>()
  {
    ...
  }
  public void DeleteObject<T> (int id)
  {
     .. logic to delete from DB using metadata about T (containing table name) and primary key field matching 'id' ...
     .. eg.. delete from typeof(T).Name where ID = id
  }
}
abstract class DomainObject
{
  private int _id;
  private DBStore _dbStore;
  public void Delete ()
  {
    _dbStore.DeleteObject<<big>WHAT SHOULD GO HERE</big>>(_id)
  }
}
class Boat : DomainObject {...}
class Car : DomainObject {...}

I would like to be able to perform following:

Car car = new Car();
car.Delete();

Boat boat = new Boat();
boat.Delete();

Only things that come to my mind are:
1) Move "Delete" method from the base class to each of the deriving class: (code redundancy .. Sigh | :sigh:

)
2) Ungenerecise the "DBStore" method (inconsistancy in DBStore -- all methods are generic, except for Delete object)

Thanks,

- Malhar

Christian Graus21-Feb-07 15:12

Re: C# Question with Generics [modified]

21-Feb-07 15:12

GetType() perhaps ?

malharone21-Feb-07 15:16

malharone

21-Feb-07 15:16

I wished! C# compiler expects a class, and not a variable of type 'type'.

<pre>Type t = GetType();
_dbStore.DeleteObject <t> (_id);</pre>

--> The type or namespace name 't' could not be found (are you missing a using directive or an assembly reference?)

-- modified at 21:22 Wednesday 21st February, 2007

Christian Graus21-Feb-07 16:02

21-Feb-07 16:02

OK, that really sucks.

C# generics are kind of gay, they are not much use for anything too complex. They are designed so people can't hurt themselves using them, I suspect.

mike montagne26-Feb-07 14:53

mike montagne

26-Feb-07 14:53

Why instead don't you genericize abstract class DomainObject<t>?

malharone27-Feb-07 11:13

malharone

27-Feb-07 11:13

If I'm not mistaken, then you're suggesting something like:
public abstract class DomainObject<T>

This will break majority of the app where I'm simply keeping a reference to the base DomainObject as opposed to DomainObject for Car. You could help clarify my misunderstanding .. but:

Assuming I changed the class declaration as above (with generics), what should I change my dependent method signature for the classes that do NOT inherit from generics?

e.g.

01. class ListViewEx
02. {
03. 
04.   DomainObject _selectedObject;
05.
06.   public void AddItem (DomainObject obj)
07.   { ... }
08.
09.   public DomainObject SelectedObject
10.   { get { return _selectedObject; }
11.     set { ... } }
12.}

- What should the line #4, 6 & 9 look like after genericising DomainObject?
- And one thing to note is that currently, ListViewEx.AddItem is designed to allow consumer to pass both objects of type Car AND Boat. If I genericize the ListViewEx to class ListViewEx <T> then a. I'll lose the functionality of adding items of multiple types, and b. Win form designer will no longer work.

Thanks,

- Malhar