Visual Basic

6-Oct-06 23:45

I have approximately 50 labels on an asp.net page written in VB.NET 2003. I use these labels to indicate when an error has occurred by changing the color to system.drawing.color.red when the user tries to submit the page.

Before I perform this validation (there are good reasons why I don't use the native validation controls) I want to make the label invisible so that they don't appear unless an error has been detected.

I tried the following (which obviously didn't work)!

dim LabelCollection as new Collection
dim x as label

for each x in LabelCollection
if x.forecolor.equals(system.drawing.color.red) then
x.visible=false
end if
next

When I debug this code it reaches the "for each" statement but skips over the rest of the code block, i.e. it doesn't appear to find any labels in the collection.

Can anyone help with this process of iterating through a collection of controls?

What have I missed?

Christian Graus7-Oct-06 0:09

7-Oct-06 0:09

Peter Stanford wrote:
dim LabelCollection as new Collection
dim x as label

I'm confused. By what piece of magic did you expect this collection to contain anything ?

The form has a Controls collection. But because a web page is heirarchical, all the controls in it also have a controls collection. You need to iterate over it recursively to find all the labels.

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

Peter Stanford7-Oct-06 1:43

7-Oct-06 1:43

Thanks, I understand recursion, what I can't find is an example of the syntax to use for this particular situation. None of the online help or forums like this one provide anything other than the answer you've just given, i.e. "just do this".

With respect, if I knew how to "just do this" I wouldn't have asked the question!

Christian Graus7-Oct-06 12:19

7-Oct-06 12:19

Well, like I said - the form has a Controls collection, and so does each control

private void SetLabels(ControlCollection ctrls)

foreach(Control c in ctrls)
{
if (c is Label)
{
// Whatever
}

SetLabels(c.Controls);
}

(somewhere else)

SetLabels(this.Controls)

Sorry, I don't 'do' VB.NET, I give answers here because I know the framework, from using C#. Hopefully, you can convert this.

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

Peter Stanford7-Oct-06 19:02

7-Oct-06 19:02

Thanks Christian,

That's all I was looking for! I can work it out from here.

Best regards

Peter Stanford7-Oct-06 19:03

How to monitor microphone input level?

7-Oct-06 19:03

Thanks Christian,

That's all I was looking for. I can work it out from here!

Best regards

re infecta6-Oct-06 21:46

re infecta

6-Oct-06 21:46

I'm using VB.net with Framework.

How to monitor the mic level of the default soundcard? I would like to be able to set a treshold value (0-100%) and when the mic level is greater than that a message box would appear. It would be important that the detection would be fast (with as short delay as possible) and consume CPU resources as little as possible.

I found some code in VB6 and C but could not translate them in VB.net.

Thank you!

,net and XML question

ranro20066-Oct-06 20:04

ranro2006

6-Oct-06 20:04

Is there a way n VB.net to count a certain number of XML nodes. Say for instance that I had an XML document that held a particular number of nodes named <employee>. Is there a function I can call to tell the exact number of nodes named <employee>?

Re: ,net and XML question

Christian Graus6-Oct-06 23:36

Re: FTP using WININET.DLL

6-Oct-06 23:36

If the XML is in an XmlDocument, or any other DOM implimentation, SelectNodes("//Nodename") will return a collection of all nodes with that name, // in XPath means to look everywhere. The collection has a Count or Length property.

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

Datareports

Chira Chandra6-Oct-06 19:47

Chira Chandra

6-Oct-06 19:47

Hi, this is chandu,

I am developing an application which includes Datareports in VB with Access. I am getting the report on user input for the first time. But when i am trying to get another record it is giving the error message like

Msgbox "Operation can't process as the object is already open"

please soleve this problem.
Please give the code.

Thank you

FTP using WININET.DLL

leezardd6-Oct-06 13:13

leezardd

6-Oct-06 13:13

Help! I am using something I don't understand and need some direction.

I am trying to use "WININET.DLL" to ftp a file. I know the function FtpPutFile returns false but I don't know why. How can I find out why? Below is a code snippet of what I am doing.
All help is greatly appreciated!

Public Function bolFtpUpload(ByVal...............<br />
            bolFtpAction = FtpPutFile(intNetConn, _<br />
                                       strLocalFile, _<br />
                                       strRemoteDirectory, _<br />
                                       intTransferTypeFlag, _<br />
                                       intContext)<br />
            If bolFtpAction = False Then<br />
                     "Transfer failed  " <br />
            Else<br />
                     "Transfer Succeeded  "<br />
            End If<br />
    End Function<br />
<br />
    Private Declare Function FtpPutFile Lib "WININET.DLL" _<br />
        Alias "FtpPutFileA" (ByVal intFtpSession As Integer, _<br />
                             ByVal strLocalFile As String, _<br />
                             ByVal strRemoteFile As String, _<br />
                             ByVal intFlags As Integer, _<br />
                             ByVal intContext As Integer) As Boolean

Tad McClellan8-Oct-06 3:42

Tad McClellan

8-Oct-06 3:42

I know this doesn't answer your question but you should use the System.Net namespace for FTP Operations.

http://msdn2.microsoft.com/en-us/library/system.net.ftpwebrequest.aspx[^]

PDF reader [modified]

alexfromto6-Oct-06 10:04

alexfromto

6-Oct-06 10:04

Hello everyone.

At work we are using PDF file to store some expenses. It's a form that sales people use and then submit it. After someone actualy rekeys it in Excel (don't ask me why).

I would like to animate process with VB.NET solution (if someone knows solution in C# I can look into translating it to VB.NET as long as it works), meaning that PDF files will be read (all form entries) and transfered to the database (no Excel).

What I need is the following:
1. Can I read PDF file and parse the form?
2. What I can use (object)?

If someone has an example I would really appreciate it.

Thank you in advance.

-- modified at 16:27 Friday 6th October, 2006

Re: PDF reader

Christian Graus6-Oct-06 23:40