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Hi everyone!
I'm writing an application on .NET CF. My app must protect some data files, which are cannot be changed or removed by user. But I don't know how to do this.
Another question. My app is protected by password. In case of user has forgotten his password, he can recover it by ordering the program to send an email (contain his password) to his email address. My problem is, this email is not secure, and anybody can read it, and then access to sensitive information stored in the program. I've not had any idea to solve this problem yet.
I'm very happy if you can give me some suggestions/solutions for my problems. Thank you!
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You have absolutly no control over data that leaves the boundries of your device. If the program sends out an e-mail that e-mail has left the boundries of the device into the unsecure world. The data will be accessible unless you encrypt it, but if you encrypt the data then the user cannot read it. If you need to keep the data secure don't use e-mail. Not having password recovery at all would be more secure.
As for securing information on the device itself you can use encryption and use the device's ID as part of the encryption key. That won't stop a clever hacker from decrypting it.
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Hi all,
I have a PictureBox1 (240 *180) on the form. I want it display me (in original size), the image that I select from a ListView1 control.
All work fine, but I desire that if original image-size exceed 240*180, it must be resized to such size to be displayed enterely in PictureBox1 (manteining the image sides-ratio).
Is there a simple way (in C.F.2 - V.B. code) to obtain it?
Thanks
modified on Sunday, October 12, 2008 1:05 PM
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Hi,
I'm thinking about developing applications for my Nokia E90, but I don't know where to start. Can anyone guide me?
Thanks!
Rafferty
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If you already have some programming experience, the only point from which you can start is to write in the search box of google "How to develop Symbian application", and read, read, read.... and learn, learn, learn....
After you can post some question here...
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haha but is there any site you can recommend? For starters, what language is it in? I did encounter 1 site where I found all the apps in C++, I wonder if I can develop an app in symbian using .Net...
Rafferty
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For starters may be is more easy Visual Basic, but C++ is without doubts the better language for performance of applications.
I started with VB and continue with it, but often I desired to know C++.
Give a look here:
http://www.windowsfordevices.com/news/NS5913080420.html
and here:
http://www.allaboutsymbian.com/news/item/6256_NET_on_S60_3rd_Edition_now_a_r.php
May be there are good news for Symbian world.
I understood that now is possible to run Windows Smart Devices application on Symbian platforms, but I not read entire articles.
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Hi Hurricane,
Thanks for the link! It got me excited. I really hope that it'll support E90 soon... I love developing on the .Net framework, so much that it might "force" me to get a smart phone instead hahaha 
Rafferty
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My opinion is that is a good idea to have a Windows Mobile based Smart Phone for who want to develop or use some particular application.
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Maybe you're right, but I like the widescreen of the e90 because I use spreadsheets a lot. For the current smartphones, one would have to set the screen to landscape mode and zoom out to be able to see many columns in one screen.
Oh well... I guess I'll just wait for .net mono to support e90 phones haha
Thanks again.
Rafferty
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Create a drawing program with the following features:
a. The user has a bounded drawing area (i.e., the user is not drawing directly on the form).
b. The user has three "tools" with which to draw: a line drawing tool, a box drawing tool, and a freehand drawer.
When the line tool is selected, the user clicks on the drawing area and, holding the button down, moves the mouse.
When the button is released, a line is drawn between the point where the button was pressed and the point where it was released. (For all of the drawing tools, you will want to write code for the MouseDown and MouseUp events of your drawing area.)
The box drawing tool works in the same manner as the line drawer, except the two points are considered the corners of a box to be drawn. When the freehand tool is selected, clicking in the drawing area places a point where the mouse pointer is.
As long as the mouse button is held down, the user can move the mouse and lines will be drawn from point to point.
The effect will be that the user is drawing directly with the mouse pointer (like the “Pencil” in the Windows Paint program).
I dont know really how to start, how to include line, rentangle and freedraw control on the form.
Thanks in advance
ZAfar
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Hi all,
After a PictureBox has displayed an image, how programmatically to clean it in Compact Framework VB?
In other words, I need the same effect as to clean a TextBox I use:
TextBox.Text = ""
I want PictureBox displays no image.
Thanks
modified on Wednesday, October 8, 2008 2:59 PM
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yourPictureBox.Image = Nothing
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Thanks Adam,
I received your reply in "real time", just while I was working around...
Your line works!
Ignazio
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Hi, I was wondering if someone here could point me to some resources for accomplishing what I would think would be a fairly simple programming task if I was familiar with the right environments.
I am an experienced Actionscript 2/3 developer myself, so I figure a transition to something like the .NET compact framework in C# should be manageable.
I want to be able to play back MP3s on my phone, but have a screen that pulses with the tempo of the music. Perhaps it would be as simple as taking the tempo information from ID3 tags I could assign and then setting up a loop timer with the corresponding interval. I'm guessing that using a few classes in C# would be the quickest route to success, but I don't know if I would be sacrificing any timing precision by going that route. In any case, I was looking at MSDN to try and get started, but the link to the compact framework tutorials is broken. 
Can anyone send me in the right direction? Thanks in advance.
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the tempo information in an mp3 tag cannot be trusted. songs change tempo and the tempo information would have limited precision. the most precist results could be acquired with a fourier transform, but that is going to be computationally expensive.
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Hi
i am a beginner programmer in windows mobile.
i know C# average.I want to write a simple program in Visual studio 2005 (C#), which produce a form contained 3 levels(name, sal,designation) and 1 submit button ,whenever I m submitting this form the data will be save anywhere in my mobile....
Please help me..
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Hi
I want to create button at run time in win mobile using vb.net 2005.
and i want to create event also at run time.
Please suggest. i write the following code...
dim btn as button
For i As Integer = 0 To 5
btn = New Button
btn.Text = sAppointmentTypes(i)
btn.Tag = sAppointmentTypesIds(i)
btn.Height = Label1.Height
btn.Left = Label1.Left
btn.Width = Label1.Width
btn.Top = Label1.Top + (Label1.Height * i + 1) + 50
'AddHandler btn.Click, AddressOf btn.Click
AddHandler btn.Click, AddressOf Me.ClickButton
Me.Controls.Add(btn)
Next
Private Sub ClickButton(ByVal sender As System.Object, ByVal e As System.EventArgs)
msgbox sender.text
End Sub
it shows the error in sender.text.
Please suggest how i do this.
Thanx
~Khatri Mitesh
khatrimitesh@hotmail.com
Bikaner (Rajasthan)
INDIA
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Private Sub ClickButotn(ByVal sender as Object, Byval e as EventArgs)
Dim b as New Button = DirectCast(sender,Button)
messagebox.show(b.text)
End Sub
Hope this helps.
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Hii
I want to change the back color of selected dated in month calender.
Like i have appointments on following dates 1-10-2008,5-10-2008,10-10-2008,15-10-2008
so i want to show these date back color is green.
How can i do this.
Please suggest.
Thanx
Mitesh Khatri
~Khatri Mitesh
khatrimitesh@hotmail.com
Bikaner (Rajasthan)
INDIA
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Hi all!
In a my Compact Framework application that I'm developing using V.S. 2005 and VB, I need to choose a .bmp image file.
If I do this work using the "classic" OpenFileDialog, all is OK and easy, but I desire to choose the file directly from a list of icons instead from the FileName.
What control allow to do it?
ImageList, ListView or ListBox?
I tryed to use both together ImageList and ListView, but I encoutered in its use some limitations respect .Framework possibilities.
The below line produces an error because the property "FromFile" is not present in Compact Framework and then I am not able to assign the string path-filename of image I want add in ImageList1.
I tryed other ways but without success.
ImageList1.Images.Add(Image.FromFile("image-path"))
Thanks for help
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You could try this
Dim b as bitmap = new bitmap("image-path")
imagelist1.images.add(b)
b.Dispose()
If you dim a bitmap you must dispose of it when you have finished.
Hope this helps.
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Hi Funklet,
Previously I already tried your suggest, but now I tried again:
Dim Bmp As Bitmap = New Bitmap("\Storage Card\Agip.bmp")
ImageList1.Images.Add(Bmp)
Bmp.Dispose()
When I launck the appl. through simulator, V.S. 2005 stop the running, and return me these series of Error:
1) - In Immediate Window:
A first chance exception of type 'System.IO.FileNotFoundException' occurred in mscorlib.dll
A first chance exception of type 'System.IO.FileNotFoundException' occurred in mscorlib.dll
A first chance exception of type 'System.NullReferenceException' occurred in System.Windows.Forms.dll
2) - In Form2.Designer.vb at row:
Me.ImageList1.Images.Add(CType(resources.GetObject("resource"), System.Drawing.Image)):
System.NullReferenceException was unhandled
Message="NullReferenceException"
StackTrace:
at ImageCollection.Add()
at TrackPlotter.Form2.InitializeComponent()
at TrackPlotter.Form2..ctor()
at System.Reflection.RuntimeConstructorInfo.InternalInvoke()
at System.Reflection.RuntimeConstructorInfo.Invoke()
at System.Reflection.ConstructorInfo.Invoke()
at System.Activator.CreateInstance()
at MyForms.Create__Instance__()
at MyForms.get_Form2()
at TrackPlotter.Form1.Button1_Click()
at System.Windows.Forms.Control.OnClick()
at System.Windows.Forms.Button.OnClick()
at System.Windows.Forms.ButtonBase.WnProc()
at System.Windows.Forms.Control._InternalWnProc()
at Microsoft.AGL.Forms.EVL.EnterMainLoop()
at System.Windows.Forms.Application.Run()
at TrackPlotter.Form1.Main()
And suggest me:
1) Use the "New" Keyword to create an Object Instance.
2) Check to determine if the Object is Null before calling the metod.
3) Get the General Help for this exception.
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I'm not sure how you are including the image in your project but I would use 'Add Existing Item' to add the image to your project and ensure 'Copy Always' or 'Copy If Newer' is in the properties of the file.
Also consider using:
ImageList1.Images.Add(new Bitmap("\Program Files\(Your Project Name)\Agip.bmp))
This way you can eliminate other factors such as a problem with the Storage Card...
You may need to dispose of the Bitmaps when the form is disposed rather than immediately...
Hope this helps.
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