Visual Basic

18-Feb-10 6:25

If you want to print with a windows driver see the folowing link:

http://support.microsoft.com/kb/322090

A POS printer is not a graphical printer.
You have to send the data raw.

modified on Thursday, February 18, 2010 1:24 PM

C# user control in VB6.0

Q2A17-Feb-10 23:06

17-Feb-10 23:06

Hi,
I have a user control developed using C#. The user control class implements two interfaces.

How can I create an instance of C# user control in VB6.0 and call functions from the two interfaces.

It is possible for me to create the control and show it on the form using Controls.Add but then I am not able to typecast the variable for the control to an interface object.

I think I am missing something but don't know what exactly.
I am new to VB and project requirement asks me to do this using VB6.0

Any help or guidance on this front is appreciated.

Eddy Vluggen17-Feb-10 23:37

17-Feb-10 23:37

You can use the .NET stuff from VB6 using the Interop Toolkit[^] from Microsoft. You can easily add both UserControls and Forms from the .NET environment to the VB6 environment.

There's also a CodeProject article[^] available with examples in C# Smile | :)

I are Troll Suspicious | :suss:

Q2A18-Feb-10 1:04

18-Feb-10 1:04

Thanks for the link. I went through the article and am not very clear about whether existing controls from C# can be hosted on the VB Form. I have a few questions regarding the same.

1. Will I have to write the entire C# .NET code (for existing user controls) or can the exising controls be ported using the toolkit directly and used from VB6.0
2. Will it be possible to create instances of .NET controls dyanamically?
3. Will I be able to handle events from the C# controls? [Got the answer to this. Yes]
4. What would be the other broad issues that one can face while using this toolkit and regarding COM Interop.
5. Any application deployment issue that one can face and dependency of the toolkit being installed on the deployment site.

Eddy Vluggen18-Feb-10 1:37

18-Feb-10 1:37

Q2A wrote:
1. Will I have to write the entire C# .NET code (for existing user controls) or can the exising controls be ported using the toolkit directly and used from VB6.0

There's some extra code required to communicate between the C# UserControl and VB6. You can use the templates that come with the toolkit to create a new UserControl, that way all the required code will be added automatically. You can also copy these routines to an already existing UserControl.

Q2A wrote:
2. Will it be possible to create instances of .NET controls dyanamically?

Yup

Q2A wrote:
3. Will I be able to handle events from the C# controls? [Got the answer to this. Yes]
4. What would be the other broad issues that one can face while using this toolkit and regarding COM Interop.

That's possible, but it's a bit slower than a .NET event.

Q2A wrote:
5. Any application deployment issue that one can face and dependency of the toolkit being installed on the deployment site.

You should be fine as long as the toolkit is installed Smile | :)

I are Troll Suspicious | :suss:

Q2A18-Feb-10 7:52

18-Feb-10 7:52

Thank you for your response. This will help me in the implementation.

Eddy Vluggen18-Feb-10 9:25

18-Feb-10 9:25

You're welcome Smile | :)

Q2A18-Feb-10 19:18

18-Feb-10 19:18

One more question.
When I dynamically created the control from C# in VB6.0 using Controls.Add I was not able to see the changed text in the text boxes. The text should have been modified in the text boxes and I am able to get the new text every 2 seconds in another file. Is this issue because of COM interop and will it be resolved using the toolkit. Any ideas on what I may be missing?

Eddy Vluggen19-Feb-10 0:57

Remove cached network username and password [Solved]

19-Feb-10 0:57

Q2A wrote:
Add I was not able to see the changed text in the text boxes. The text should have been modified in the text boxes and I am able to get the new text every 2 seconds in another file.

I don't completely understand what you're trying to do, so I'll try to reformulate the question first.

You created a C# control, and loaded it in VB6. The C# control has some textboxes, and they should contain the data from a file. And if you open the C# control from a VB6-application, the textboxes are empty?

Where are these textfiles stored?

I are Troll Suspicious | :suss:

andre de jong17-Feb-10 22:01

17-Feb-10 22:01

Hello,

Is there an API that i can use to remove cached username(s) and password(s) that are used to connect to a network share

When I'm removing a network share from Windows the username(s) and password(s) are cached.
Below is the function i use to remove the share.

Private Declare Function WNetCancelConnection2 Lib "mpr.dll" Alias "WNetCancelConnection2A" _
(ByVal lpName As String, ByVal dwFlags As Integer, ByVal fForce As Integer) As Integer

Thanks in advance.

modified on Thursday, February 18, 2010 3:46 PM

Dave Kreskowiak18-Feb-10 2:16

Dave Kreskowiak

18-Feb-10 2:16

andre de jong wrote:
When I'm removing a network share from Windows the username(s) and password(s) are cached.

No, they're not. Windows does not cache that information. Perhaps you're talking about a users persisted drive mapping?

A guide to posting questions on CodeProject[^]

Dave Kreskowiak
Microsoft MVP
Visual Developer - Visual Basic
2006, 2007, 2008
But no longer in 2009...

andre de jong18-Feb-10 6:03

18-Feb-10 6:03

When I,m mapping a network Share with the WNetAddConnection2 function and then remove the share again
I can add the share with the same function again but without providing a username and password.
Even after a reboot.

Private Declare Function WNetAddConnection2 Lib "mpr.dll" Alias "WNetAddConnection2A" _
(ByRef lpNetResource As NETRESOURCE, ByVal lpPassword As String, _
ByVal lpUserName As String, ByVal dwFlags As Integer) As Integer

dwFlags = CONNECT_TEMPORARY

''' The network resource connection should not be remembered.
''' If this flag is set, the operating system will not attempt to restore the connection
''' when the user logs on again.

Is there a way to remove the username and password when the mapped network share is removed?
Or am I using the wrong "dwFlags"

Dave Kreskowiak18-Feb-10 7:16

Dave Kreskowiak

18-Feb-10 7:16

andre de jong wrote:
I can add the share with the same function again but without providing a username and password.
Even after a reboot.

andre de jong wrote:
Is there a way to remove the username and password when the mapped network share is removed?

There is no cache of the username and password. It's that simple. You're trying to remove something that doesn't exist.

A guide to posting questions on CodeProject[^]

Dave Kreskowiak
Microsoft MVP
Visual Developer - Visual Basic
2006, 2007, 2008
But no longer in 2009...

andre de jong18-Feb-10 9:50

18-Feb-10 9:50

Thanks Dave for your help.

The samba server was the one that cached the cridentials.

andre de jong18-Feb-10 9:54

Re: Excel verison problem

18-Feb-10 9:54

Thanks Dave for your help.

It was the Samba server that cached the cridentials.

After a restart of the samba server Windows asked for the cridentials.

Excel verison problem

D.Manivelan17-Feb-10 19:34

D.Manivelan

17-Feb-10 19:34

Hi,
I make a code for open ms excel through vb.net exe. I am using excel 2003,it is working fine in my local PC, but not work in anothor PC because they have a ms excel 2000.How can i solve this problem any one plz help me.

JustWorking17-Feb-10 20:52

JustWorking

17-Feb-10 20:52

use this in the connection string for excel 2000:

Provider=Microsoft.Jet.OLEDB.4.0;Data Source=FileLocation.xls;Extended Properties="Excel 8.0;HDR=YES;"

Unicode text in vb 6.0

getnanda@gmail.com17-Feb-10 19:09

getnanda@gmail.com

17-Feb-10 19:09

Is it possible to display unicode text in buttons and menu of vb forms. Am using vb 6.0. and I was able to display some Chinese text in text box and label by changing font. But for buttons, cannot change the font to chinese.

Thanks in Advance
Nanda

Re: Unicode text in vb 6.0

Eddy Vluggen17-Feb-10 23:34