file access problem - Visual Basic Discussion Boards

Re: Sending e-mail in VB .NET

cApSL0ck AvAtAr29-Aug-04 20:32

cApSL0ck AvAtAr

29-Aug-04 20:32

Wow! Thanks, that really helped. Now I know how to add a reference too Poke tongue | ;-P

y helothar noob

Events fired up on focus change.

Member 132035228-Aug-04 2:10

Member 1320352

28-Aug-04 2:10

When I shift to a tab page and turn to the previous again, selectedIndex changed event is triggered for comboboxes on newly focused tab. When I shift to another program and come back to program form key up events are fired! To prevent this I used boolean flags but isn't this behaviour stupid? There must be a more elegant solution.

Thanks a lot.

Re: Events fired up on focus change.

Anonymous28-Aug-04 11:28

Anonymous

28-Aug-04 11:28

Microsoft Knowledge Base Article - 820633

PRB: Unexpected Events Are Raised When You Switch Between Tab Pages with a ComboBox or a ListBox Control

http://support.microsoft.com/default.aspx?scid=kb%3Ben-us%3B820633

Re: Events fired up on focus change.

Dave Kreskowiak29-Aug-04 3:17

Dave Kreskowiak

29-Aug-04 3:17

Clickety[^]

RageInTheMachine9532
"...a pungent, ghastly, stinky piece of cheese!" -- The Roaming Gnome

Re: Events fired up on focus change.

Member 132035229-Aug-04 21:40

Member 1320352

29-Aug-04 21:40

Thanks. It seems that our boolean flags will stay in the code. Cry | :((

How to change the color of the text of a DateTimePicker??

claytonvaldo27-Aug-04 10:48

claytonvaldo

27-Aug-04 10:48

Hello all,

I'm trying to change the color of the text of a DateTimePicker, just the text that appear in the control after we clicked in a date on the calendar.

I've already used the ForeColor and it didn't work and I tryed the CalendarForeColor and they changed the color of the calendar, not the text that I'd like to.

What should I do.

Thanks.

--------------------------------
Clayton Valdo

--
Clayton

Build the tree view in vb 6

lardex27-Aug-04 7:12

lardex

27-Aug-04 7:12

Can somebody tell me how to make a tree view in vb 6, i need it froom beginning. I am trying to build a maintenance program.

Big Grin | :-D

file access problem

tommy_tanaka27-Aug-04 5:32

tommy_tanaka

27-Aug-04 5:32

hello there -

i have two applications. the first one save a bitmapfile to a certain directory.
the second one just reads this bitmapfile into a picturebox.

the first time everything works fine.
but as soon as the first application wants to write again the file to the same path and filename, an exception is thrown. i know why, because application two seems to have the bitmapfile protected from overwriting, because it uses it in the picture box.

but i want to have the actual bitmap in the picturebox. any idea how i can solve my problem?

Save-Function of Application 1:
picPath = "\\Matrix\Kunden\server.bmp"
getScreenShot._getImage.Save(picPath)

Read-Function of Application 2:
path = "\\Matrix\Kunden\server.bmp"
Me._schoolMain.Screenshot.Image = screenShot.FromFile(path)

thx for any help.

tom

Re: file access problem

Dave Kreskowiak27-Aug-04 6:09

Dave Kreskowiak

27-Aug-04 6:09

Your having this problem, not because the image is shown in a PictureBox, but because the Bitmap object in your 2nd application is keeping an open file handle to the image file that your loading.

The workaround can be found here[^] on MSDN.

RageInTheMachine9532
"...a pungent, ghastly, stinky piece of cheese!" -- The Roaming Gnome

Re: file access problem

tommy_tanaka28-Aug-04 3:03

tommy_tanaka

28-Aug-04 3:03

well, thank you for the link. i tried it this way but something i seem to do wrong ...

here the code:
Public Sub _getClientScreenShot() Implements IServer._getClientScreenShot
Dim user As IClient
Dim path As String
Dim screenShot, screenShotTemp As Bitmap
Dim screenGraphics As Graphics

For Each user In _clients.Values
Try
user._captureScreen()
path = "\\Matrix\Kunden\" + user._computerName.ToString + ".bmp"
screenShotTemp = Image.FromFile(path)
screenGraphics.FromImage(screenShotTemp)
screenGraphics.DrawImage(screenShot, 0, 0)
screenShotTemp.Dispose()
screenGraphics.Dispose()
Me._schoolMain.Screenshot.Image = screenShot

Catch e As Exception
Me._schoolMain.Info.Text = "Exception in Screenshot: " & e.ToString
End Try
Next
End Sub

unfortunately, the failure got worse. the application that calls this function hangs up...

what did i wrong?

Re: file access problem

Dave Kreskowiak29-Aug-04 3:16

Dave Kreskowiak

29-Aug-04 3:16

tommy_tanaka wrote:
path = "\\Matrix\Kunden\" + user._computerName.ToString + ".bmp"

First, you don't need to call .ToString here. _computerName is already a String and doesn't need to be converted to one.

tommy_tanaka wrote:
Dim screenShot, screenShotTemp As Bitmap
Dim screenGraphics As Graphics

For Each user In _clients.Values
Try
user._captureScreen()
path = "\\Matrix\Kunden\" + user._computerName.ToString + ".bmp"
screenShotTemp = Image.FromFile(path)
screenGraphics.FromImage(screenShotTemp)
screenGraphics.DrawImage(screenShot, 0, 0)
screenShotTemp.Dispose()
screenGraphics.Dispose()
Me._schoolMain.Screenshot.Image = screenShot

Second, you're doing alot of unecessary work and this is where your hanging up. All you need to do is load the picture into your screenShotTemp and make a copy of it using a new Bitmap object. Then use the copy as your PictureBox source image and release the original image in your temp variable.

        Dim screenShotTemp As Bitmap
        Dim path As String
.
.
.
        path = "\\Matrix\Kunden\" + user._computerName + ".bmp"
        screenShotTemp = Image.FromFile(path)
        Dim screenShot As New Bitmap(screenShotTemp)
        PictureBox1.Image = screenShot
        screenShotTemp.Dispose()

The Bitmap class has about a dozen different constructors. Read up on them here[^].

RageInTheMachine9532
"...a pungent, ghastly, stinky piece of cheese!" -- The Roaming Gnome

Print MSChart from VB.Net

amdinar27-Aug-04 5:19

amdinar

27-Aug-04 5:19

I am trying to print a mschart from a vbnet project.
In vb6 it was easy:
MSChart1.EditCopy
Printer.PaintPicture Clipboard.GetData(), x, y
But vbnet no longer has a printer object.
I have tried:
Clipboard.SetDataObject(Me.MeanChart)
e.Graphics.DrawImage(Clipboard.GetDataObject, Y)
DrawImage does not take the argument.
Need help
Thanks ahead
amdinar

store a sql result in a xml document

tofito27-Aug-04 4:26

tofito

27-Aug-04 4:26

Hello,

I'm trying to store in a New xmlDocument a sql query result, but i'm failed
i'm trying to store the result in a stream and loadxml the stream but i have a lot of error yet.
i want to create a new xml document and make a loadxml with the return of my command object
it was so easy with asp and vb 6 ...

Thanks

clecorre95@hotmail.com

Re: store a sql result in a xml document

Dave Kreskowiak27-Aug-04 6:16

Dave Kreskowiak

27-Aug-04 6:16

You might want to check out How To Persist an ADO.NET DataSet as XML by Using Visual Basic .NET[^] on MSDN.

RageInTheMachine9532
"...a pungent, ghastly, stinky piece of cheese!" -- The Roaming Gnome

WMI and Terminal Server

Anonymous27-Aug-04 3:08

Anonymous

27-Aug-04 3:08

Hi

I want to be able to query a remote server to see if there is anybody logged onto it via a RDP terminal services connection.

Does know if this is possible or what the code would be for this?

Thanks
Andrew

WMI and Terminal Server

Anonymous27-Aug-04 3:07

Anonymous

27-Aug-04 3:07

Re: WMI and Terminal Server

Dave Kreskowiak27-Aug-04 3:37

Dave Kreskowiak

27-Aug-04 3:37

This information is only available using the WMI Session Provider, which is only available on Windows XP and Server 2003. The client machine that reads the information must be XP or better. There is no support for other Windows versions.

SessionProvider[^] documentation

RageInTheMachine9532
"...a pungent, ghastly, stinky piece of cheese!" -- The Roaming Gnome

Re: WMI and Terminal Server

Anonymous27-Aug-04 3:47

Anonymous

27-Aug-04 3:47

Thanks for that, so you know if there is any other way to get this info, other than by WMI?

Re: WMI and Terminal Server

Dave Kreskowiak27-Aug-04 4:25

Dave Kreskowiak

27-Aug-04 4:25

You'll have to P/Invoke the WTSEnumerateSessions[^] function, along with the supporting functions, like WTSOpenServer[^], and WTSCloseServer[^] to get the information you need without the limitations of operating system version and WMI. These links should give to a good start for working with teh Terminal Services API.

RageInTheMachine9532
"...a pungent, ghastly, stinky piece of cheese!" -- The Roaming Gnome

Problems with the GUID

BoxenBiene26-Aug-04 23:24

BoxenBiene

26-Aug-04 23:24

Hi all again,

The next problem that I have is the following:

I declare 2 static constants as a GUI for the SQL-Database.

Private Const GUI1 as new GUID = ??????

How must I finish the Line??????

Thanks in advance

BB

Re: Problems with the GUID

Dave Kreskowiak27-Aug-04 3:32

Dave Kreskowiak

27-Aug-04 3:32

You can't do the GUID = ???? thing, but you can create a new GUID contant using one of the Guid structure constructors.

Dim myGUID As New System.Guid("{CA761232-ED42-11CE-BACD-00AA0057B223}")

See this[^] page for the complete docs on the Guid structure constructors.

RageInTheMachine9532
"...a pungent, ghastly, stinky piece of cheese!" -- The Roaming Gnome

How can I access the Comport

BoxenBiene26-Aug-04 23:17

BoxenBiene

26-Aug-04 23:17

Hi all,

in VB6 I had the MSComControl to comunicate with the Comports. How can I realize the comunication with the comport in VB.Net?

Thanks in advance

BB

Re: How can I access the Comport

Dave Kreskowiak27-Aug-04 3:27

Dave Kreskowiak

27-Aug-04 3:27

Use P/Invoke to Develop a .NET Base Class Library for Serial Device Communications[^]

RageInTheMachine9532
"...a pungent, ghastly, stinky piece of cheese!" -- The Roaming Gnome

Xml & VB.Net- Please help me

Meysam.Khayatan26-Aug-04 21:16

Meysam.Khayatan

26-Aug-04 21:16

Hi
Can anyone tell me
HOW CAN I SAVE A PICTURE FILE OR PICTUREBOX.IMAGE IN XML FILE IN VB.NET?
i must save my form and all it's component in XML format and then again create my form by using my xml file. how can i do this and save image in picturebox on my form?

Best Regards
M.Khayatan

MkhProgrammer

Re: Xml & VB.Net- Please help me

Dave Kreskowiak27-Aug-04 3:25

Dave Kreskowiak

27-Aug-04 3:25

XML wasn't really designed to handle binary data like an image, but it is possible to do. Check out this article[^] by CodeZX to see how it's done. It's written in C#, but converts easily to VB.NET.

RageInTheMachine9532
"...a pungent, ghastly, stinky piece of cheese!" -- The Roaming Gnome

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