C#

Re: Reference form objects on docked user control and tab control

8-Jul-09 2:35

Good morning.

I have a user control which is docked on a form. On this user control there are three tabs. On the first tab, there are some text boxes, labels, and command boxes. The names I am trying to reference from the DAL class are as follows:

tabControl1
ucTabs user control
UIPCMainForm form
tpEntry first tab
tbContainer textbox

I used Intellisence, but could not come up with the references in any combination.

Any ideas? Thank you, WHEELS

musefan8-Jul-09 2:39

Re: Reference form objects on docked user control and tab control

8-Jul-09 2:39

OK think you have lost me a bit.

Are you trying to access controls in one class from another class?
If so, make sure they have an access type that is available outside the class, i.e. 'public'

Better still, Create Properties to the data you wish to manipulate from another class, like...

public string TextBox1Text{
   get{return TextBox1.Text;}
   set{TextBox1.Text = value;}
}

That goes in the same class that has the textbox in.

Life goes very fast. Tomorrow, today is already yesterday.

Wheels0128-Jul-09 2:54

Re: Reference form objects on docked user control and tab control

8-Jul-09 2:54

Hi musefan.

I am trying to access controls from one class to another.

I added the following to the user control (docked form) class:

public string TbContainer
{
get { return tbContainer.Text; }
set { tbContainer.Text = value; }
}

When I tried to reference the control it still doesn't come up under Intellisence.

I figured it should be something like ucTabs.tbContainer, ucTabs.tbEntry.tbContainer, ucTabs.tabControl1.tbEntry.tbContainer, etc.

Any suggestions?

WHEELS

musefan8-Jul-09 2:59

Re: Reference form objects on docked user control and tab control

8-Jul-09 2:59

By default, when you add controls in the designer (which I assume you are using) they will be set at 'private'

So, if you want to have them available, go into the designer file and set them to 'public' but this is bad practice.

What exactly do you want to do with these controls and maybe I can give a better suggestion?

Life goes very fast. Tomorrow, today is already yesterday.

Wheels0128-Jul-09 3:04

Re: Reference form objects on docked user control and tab control [modified]

8-Jul-09 3:04

In this instance, I need to take the value entered by the user and pass it as a variable to a API call.

The value may also be used in a lookup in a query on a database.

I hope that helps.

WHEELS

musefan8-Jul-09 3:08

Re: Reference form objects on docked user control and tab control

8-Jul-09 3:08

So you want to get the value of 1 textBox?

the property example i gave you will do this... you could also try a simple method...

public string GetMyValue()
{
return TextBox1.Text;
}

...thou that's basically a property without a 'setter' (a 'getter')

P.S make sure you use parameters in any database query you do using user defined values

Life goes very fast. Tomorrow, today is already yesterday.

modified on Wednesday, July 8, 2009 9:19 AM

Wheels0128-Jul-09 3:12

Re: Reference form objects on docked user control and tab control

8-Jul-09 3:12

Thank you musefan.

I appreciate your willingness to help and your prompt responses.

Have a great day, WHEELS

musefan8-Jul-09 3:15

loading picture in to picture box

8-Jul-09 3:15

No problem

Life goes very fast. Tomorrow, today is already yesterday.

Vivek Vijayan8-Jul-09 2:28

8-Jul-09 2:28

how can can i load an image from a file in to a picture box in mobile application (not using filedialog)
when the page loads it must display the picture

This code was posted by me...

musefan8-Jul-09 2:36

8-Jul-09 2:36

Well you can use...

PictureBox1.Image = Image.FromFile("filepath");

But you will probably bump into file access issues at some point so use the following...

FileStream fs = new FileStream("filepath", FileMode.Open, FileAccess.Read);
PictureBox1.Image = Image.FromStream(fs);
fs.Close();

That should do the trick for you

Life goes very fast. Tomorrow, today is already yesterday.

Vivek Vijayan8-Jul-09 2:40

8-Jul-09 2:40

both fromfile and fromstream are not available in mobile application

This code was posted by me...

musefan8-Jul-09 2:47

8-Jul-09 2:47

~~well you didn't say anything about that in your original post.~~ - Hmmmm... was that there before? My bad if it was Sniff | :^)

Are you using the compact .Net Framework? Here's[^] one of many links on a google search

P.S There is a forum dedicated to 'Mobile Development'

Life goes very fast. Tomorrow, today is already yesterday.

Vivek Vijayan8-Jul-09 5:07

8-Jul-09 5:07

byte[] data = new byte[1024];
data=receivefile();
System.IO.MemoryStream ms = new System.IO.MemoryStream(data);
try
{
FileStream fs = new FileStream("\\Program Files\\syswifi\\pic\\screen.Bmp", FileMode.Create);
ms.WriteTo(fs);

ms.Flush();
fs.Close();
ms.Close();

i m getting "exception in this code"
pictureBox1.Image = new Bitmap("\\Program Files\\pic\\screen.Bmp");

}
i getting "Exception" int he last line
it is not telling what is the exception just Exception

This code was posted by me...

musefan8-Jul-09 5:26

8-Jul-09 5:26

well first thing I see is that the two file paths are not the same, if that not the problem can you confirm that a Bitmap is successfully created opening it manually?

Life goes very fast. Tomorrow, today is already yesterday.

Vivek Vijayan8-Jul-09 6:01

8-Jul-09 6:01

thats not a matter when debuggin i copy the image from
\\Program Files\\syswifi\\pic\\screen.Bmp
to
\\Program Files\\pic\\screen.Bmp

This code was posted by me...

musefan8-Jul-09 6:28

8-Jul-09 6:28

you say you don't get an error message. is that because you are handling the catch yourself? either add a messages box showing the exceptions message. Or remove the try catch and let the system give you an error message. maybe that will help

Life goes very fast. Tomorrow, today is already yesterday.

Vivek Vijayan8-Jul-09 6:52

8-Jul-09 6:52

the exception is caught in the line
picturebox.image=new bitmap(fs)
where fs is filestream

This code was posted by me...

Vivek Vijayan8-Jul-09 6:58

8-Jul-09 6:58

NullReferenceException is caught in that line

This code was posted by me...

musefan8-Jul-09 7:07

8-Jul-09 7:07

well if you add a break what object is null? The PictureBox? The Image? or the Bitmap?
Can you put in code to verify the file exists...

if(File.exists("filepath"))
//show message

Life goes very fast. Tomorrow, today is already yesterday.

Vivek Vijayan8-Jul-09 8:17

8-Jul-09 8:17

i don knwo wht is happening,The file is created. that i can see when when i browse the folder. but null reference exception is shown when i run applcn.
here is the code
FileStream fs = File.Open("\\Program Files\\syswifi\\pic\\screen.Bmp",FileMode.Create);
ms.WriteTo(fs);
ms.Flush();
fs.Close();
ms.Close();
FileStream fstr = File.Open("\\Program Files\\syswifi\\pic\\screen.Bmp", FileMode.Open);
pictureBox1.Image = new Bitmap(fstr);

This code was posted by me...

musefan8-Jul-09 11:45

8-Jul-09 11:45

What is it that is null thou?

OK what i suggest is you put a breakpoint after each line of code and check the status of each variable (also check the new bitmap once the first filestream has been closed)
you can also use a message box in each line and the pause the application for each one if you prefer.

Hopefully then you can confirm what value it is that is null and get somewhere from there

Life goes very fast. Tomorrow, today is already yesterday.

Vivek Vijayan8-Jul-09 21:46