Visual Basic

2-May-09 4:39

Hello,

I created a form in designer view with image bitmaps on them. I cannot do much in my code according to the compiler error that I have the images as read-only.

None of the images can be set to a value of image; windows.systems.forms.bitmaps doesn't allow it.

Any help on how I can make the form write and read or parts of the form, like the images that I want to move on the form would be appreciated.

Thank you in advance.

Dave Kreskowiak2-May-09 4:52

2-May-09 4:52

Your description makes no sense at all. I have no idea what controls and properties you're talking about that are "ReadOnly". If you ran your project and then went back to Visual Studio to make changes, and your app is still running, then, yes, nearly everything is going to be ReadOnly. You have to stop the app first, then make the changes in the designer.

A guide to posting questions on CodeProject[^]

Dave Kreskowiak
Microsoft MVP
Visual Developer - Visual Basic
2006, 2007, 2008

ymilan2-May-09 4:58

2-May-09 4:58

I did stop the app and looked in designer view, but there is no attribute I can set for the property of the form to be writable. Basically, I'm trying to move images on one part of the screen to the top of other images on the other side of the screen, in a drag drop operation. It doesn't work as I thought; I read several tutorials and tried different code, but nothing seems to move on the form at run-time.

I hope this is a better explanation.

Dave Kreskowiak2-May-09 5:30

2-May-09 5:30

ymilan wrote:
I did stop the app and looked in designer view, but there is no attribute I can set for the property of the form to be writable.

There is no such property. All of the controls on a form are static, meaning, you cannot move them around with the mouse.

YOU have to provide the code that will handle what happens when the user holds the mouse down on a control and moves the mouse around. This is not going to be a trivial task for a beginner. It requires in depth knowledge of how controls and mouse events work.

I wrote up an article on how to do this very thing with Label controls. You can read it here[^].

A guide to posting questions on CodeProject[^]

Dave Kreskowiak
Microsoft MVP
Visual Developer - Visual Basic
2006, 2007, 2008

ymilan2-May-09 5:45

2-May-09 5:45

So there is no way to just set the form to be writable off the bat?

I tried several mouseover, mousemove events that I found on net tutorials.   None of them worked.   HEre is code I have so far.

Private Sub Image1_DragEnter(ByVal sender As Object, _
ByVal e As System.Windows.Forms.DragEventArgs) _
Handles Image1.DragEnter
            Dim Button As Short

            If (e.Data.GetDataPresent(DataFormats.Bitmap)) Then

                  If (Button = VB6.MouseButtonConstants.LeftButton) Then
e.Effect = DragDropEffects.Copy
            Else
                  e.Effect = DragDropEffects.Move
            End If

      End Sub
      'Private Sub Hearts_DragDrop(ByVal sender As Object, _
      'ByVal e As System.Windows.Forms.DragEventArgs) _
      'Handles Hearts.DragDrop
      'Hearts.Item = e.Data.GetData(DataFormats.Bitmap)
      'End Sub

      Private Sub Hearts_DragOver(ByVal sender As Object, _
      ByVal e As System.Windows.Forms.DragEventArgs) _
      Handles Hearts.DragOver

      End Sub
      Private Sub Clubs_DragOver(ByVal sender As Object, _
      ByVal e As System.Windows.Forms.DragEventArgs) _
      Handles Clubs.DragOver

      End Sub
      Private Sub Hearts_DragLeave(ByVal sender As Object, _
      ByVal e As System.EventArgs) _
      Handles Hearts.DragLeave

      End Sub
      Private Sub Clubs_DragLeave(ByVal sender As Object, _
      ByVal e As System.EventArgs) _
      Handles Clubs.DragLeave

Sorry I'm a newbie, but I'm really trying....much appreciation in advance.

ymilan2-May-09 6:13

2-May-09 6:13

Would this be a sound article to study?

<a href="http://www.startvbdotnet.com/forms/mouse.aspx">http://www.startvbdotnet.com/forms/mouse.aspx</a>[<a href="http://www.startvbdotnet.com/forms/mouse.aspx" target="_blank" title="New Window">^</a>]

Dave Kreskowiak2-May-09 16:24

2-May-09 16:24

It's a very brief overview, but it's a decent place to start.

A guide to posting questions on CodeProject[^]

Dave Kreskowiak
Microsoft MVP
Visual Developer - Visual Basic
2006, 2007, 2008

Dave Kreskowiak2-May-09 16:25

2-May-09 16:25

ymilan wrote:
So there is no way to just set the form to be writable off the bat?

There is simply no such thing. If you want to move controls around on the form at run-time, you have to write the code that provides such functionality. It is NOT built into the Form, nor anywhere else in the .NET Framework.

A guide to posting questions on CodeProject[^]

Dave Kreskowiak
Microsoft MVP
Visual Developer - Visual Basic
2006, 2007, 2008

ymilan3-May-09 4:07

3-May-09 4:07

Ok, now I've read many tutorials and examples of mousemove, dragenter, and dragover. The main problem right now that I'm having is I'm trying to move a picturebox array. I keep getting compiler errors that value of type system.drawing.image is not a valid member or type of picturebox array.

I've looked up on MSDN the properties of pictureboxarray and it does show dragenter, dragover, and mousemove. However, I'm not finding any examples of how I can use the picturebox array to move the images I have on design view.

In VB6, all I had to do is set oledragdrop to true and it worked.

Any ideas on where or how I should accomplish this is much appreciated.

Hopefully I'm explaining a little bit better now. Thank you for your expertise.

Tiyani Miyambo4-May-09 0:30

Tiyani Miyambo

4-May-09 0:30

you could try to use pecture box. me.picturebox.image = directry of the image, play around on how to justify the size of the image to fit in the piturebox

waitforexit

hrishi3212-May-09 4:34

2-May-09 4:34

Hi,
Another problem of mine.
I run a process(say a calculator) from a button click. Now I want to resume(do nothing/disable) the form till the user finishes the process ie till he closes the calculator.
I am using waitforexit like below(not the exact code)

dim p as new process
p.startinfo="calc"
p.waitforexit()
p.start()

It works fine,.But sometime it gives an error in the line(p.waiforexit) saying that p has not been allocated any process (not the exact error, but with similar measning)

Please help me

Thanks in advance

Dave Kreskowiak2-May-09 4:49

2-May-09 4:49

This is because your Waiting for the process to exist before you start the process! You can't wait for something to exit if it doesn't exist yet! Switch those two lines around and it'll work.

A guide to posting questions on CodeProject[^]

Dave Kreskowiak
Microsoft MVP
Visual Developer - Visual Basic
2006, 2007, 2008

hrishi3212-May-09 5:01

2-May-09 5:01

thanks for your reply

i think u r mistaking me.

its waitforexit not exist...

Henry Minute2-May-09 5:08

Henry Minute

2-May-09 5:08

himangshu123 wrote:
i think u r mistaking me.

No but you are mistaking him.

Dave Kreskowiak correctly pointed out that your code waits for exit before it starts. It should start and then wait for exit;

p.waitforexit()
p.start()

switch those two lines round then all should be well.

Incidentally in your OP you stated that the code you posted was not the exact code, and the error message was not the exact error message. In this case it doesn't seem to have made any difference, but you really should (particularly for error messages), give the exact wording.

Henry Minute

Do not read medical books! You could die of a misprint. - Mark Twain
Girl: (staring) "Why do you need an icy cucumber?"
“I want to report a fraud. The government is lying to us all.”

hrishi3212-May-09 5:10

2-May-09 5:10

oh apologise me...

my mistake...
actually I have done the same...i didnt cut copy the code so that mistake came...sorry...

please help me

Dave Kreskowiak2-May-09 5:22

2-May-09 5:22

A very minor typo.

A guide to posting questions on CodeProject[^]

Dave Kreskowiak
Microsoft MVP
Visual Developer - Visual Basic
2006, 2007, 2008

hrishi3212-May-09 5:11

2-May-09 5:11

sorry....

code is

dim p as new process
p.startinfo="calc"
p.start()
p.waitforexit()

this was my actual code
still the problem arise

Dave Kreskowiak2-May-09 5:26

hide TaskBar with the form

2-May-09 5:26

Next time, copy and paste the code. Don't retype it from memory. You'll get the order of statements wrong and quite possibly not convey some minor detail that makes all the difference to whether your code runs or not.

Between the call to .Start and .WaitForExit, add the line p.WaitForInputIdle(). This will force your code to wait for the app to start.

A guide to posting questions on CodeProject[^]

Dave Kreskowiak
Microsoft MVP
Visual Developer - Visual Basic
2006, 2007, 2008

hrishi3212-May-09 4:22

Re: hide TaskBar with the form

2-May-09 4:22

Hi to All,

Here is an another problem of mine.I am using vb.net2005.
I want to maximize the form so that user can not access the taskBar. I got some code,to hide the windows task bar. But when I run another process(say calculator) from my application, the taskbar reappears.

So I was wondering if any method or property is there to maximize the form so that, the form comes top of the task bar itself....

Please suggest a way

Thanks in advance

Eddy Vluggen2-May-09 4:40

Eddy Vluggen

2-May-09 4:40

Create your own Desktop-object[^] Smile | :)

I are troll Smile | :)

DirListBox control in vb.net2005

hrishi3212-May-09 4:18

Re: DirListBox control in vb.net2005

2-May-09 4:18

hi to all

Could anyone please tell me how to block certain drives to be accessed while looking for sub directories and files.
(All I want is to give an environment to the user so that HE CAN LOOK FOR FILES IN A DIRECORY, WHICH ALSO MAY HAVE SUBDIRECTORIES). The tool I am using is dirListBox in vb.net2005.
But my problem is that user can go to all the files and directories in the computer. (i WANT HIIM TO ACCESS THE FILES AND FOLDER OF A SPECIFIED DIRECTORY ONLY, SAY INSIDE C:\AA)..
NOW HOW TO FILTER THE DIRLISTBOX,?

please advice me if any other method is there for the same...(not necessary to be the DirListBox control)

THNAKS IN ADVANCE

Dave Kreskowiak2-May-09 4:47

Re: DirListBox control in vb.net2005

2-May-09 4:47

himangshu123 wrote:
The tool I am using is dirListBox in vb.net2005.

There is no "DirListBox" in VB.NET. Are you talking about the OpenFileDialog or are you using the old DirListBox from the VB6 days?? The old DirListBox could not be filtered or limited to a group of folders.

A guide to posting questions on CodeProject[^]

Dave Kreskowiak
Microsoft MVP
Visual Developer - Visual Basic
2006, 2007, 2008

hrishi3212-May-09 4:57