Asp.net - Legacy ActiveX Control Calls DLL Functions?
Sep 1, 2010
Hint: this one might sound complicated, because I am trying to give as much info as possible, but I suspect that I just want someone to tell me "yes, you are correct".On this legacy system, which dates from 2002, the user visits a web page and uses an RFID reader to read a tag number, which is then written to an input field on the web page.
The only s/w that comes with the reader is a custom DLL, nop .exe. The very sparse documentation insists that only MSIE be used and that all security relating to ActiveX be disabled.When I look into the source of the web page I see calls to functions in the DLL.Now, here's the fun part: I know zilch about ActiveX, I have to make a minor change to the DLL _but_ the VB6 source code has been lost, so I guess that I have to recreate the (seemingly very simple) DLL from scratch - this week.
Decompiling the DLL shows me the functions (locateReader, getTagVal, closeReader). However, by decompiling I can't really know the number or type of the parameters, nor the return values ... and if anyone knows the API they are refusing to share it, but basically it all seems to have been lost in the mists of time as companies went bust, were bought & sold, merged & demerged and the initial DLL might have been written by an external guy, but no one knows who.So, can I get the function params & type from the ASP page source?I see things like
Reader = new ActiveXObject("<dllName>.Reader");
Reader.locateReader();
tagVal = Reader.getTagVal();
Reader.closeReader();
I would say that none of the fn()s take parameters, that closeReader doesn't have to return anything; it looks like locateReader doesn't return anything either, so I guess that error handling will have to be in the DLL (loop forever with a popup demanding that a reader be attached; and getTagVal seems to return a string.
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Jan 8, 2010
I am looking for a utility/tool to convert calls to legacy VB6 functions to the .NET equivalent. For example, it would convert this...
[Code]....
Does anybody know of one, or am I going to have to roll my own?
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Jan 29, 2007
1) Is it possible to access the Excel mathematical functions without actually opening Excel?
I was thinking of through a DLL WinAPI call or maybe a delegate function or smaller program?
2) Does anyone know of a MS link or area that gives instruction on "how to" use every function of every Windows DLL at all?
Or for all those that Microsoft have chosen to document online at least.
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Apr 8, 2009
I am trying to load an actixex component in a VB project which was made in Visual C++.n VBA it works fine.In VB6, when I try to load the component on the toolbox I get an "Error 35005"In VB2008 the component can be added to the toolbox, but when I try to place it on the form, the following error occurs: "Failed to import ActiveX control. Please ensure it is properly registered."
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Oct 20, 2010
How to Resolve following Error in .netNon-modal forms cannot be displayed in this host application from an ActiveX DLL, ActiveX Control, or Property Page.
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Oct 22, 2010
I have been trying to build a game bot in vb.net.One of the main problems is getting access to the text the game prints on the screen so I have been trying to hook the games calls to the windows api drawtext and textout functions.I have been hunting for examples of how to set up a hook in vb.net for a long time without any luck.I have found it impossible to translate examples in old school vb, C++, and C#.For convenience's sake I would like to use the freely available deviare and/or easyhook libraries.
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Oct 28, 2009
I am trying to send data and arrays using System.Object and System.Event. Lets say I have 4 pieces of data: date, y(1),y(2),y(3).
sub main(...)
Dim date,y(1),y(2),y(3) as integer
Dim obj as System.Object
Dim args as System.Eventargs
How do I organize obj with all the integer data above so I can send it to main2.
main2(obj,args)
end sub
Sub main2(obj as System.Object,args as System.Eventargs)
End Sub
And how do I apply this to (ByVal sender as System.Object, ByVal e as System.EventArgs). I am using VB.net 2005.
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Feb 15, 2012
In our VB6 applications, we added a few utility functions for tracking the amount of time spent in a function. We did this to track performance bottlenecks. Basically, how it worked was there were two utility functions:
StartTickCount() and EndTickCount().
You would pass the name of the function in each, and the functions would use a dictionary to get the tick count when StartTickCount() was called, and then subtract the tick count when EndTickCount() was called. This wasn't perfect because it didn't of course take into consideration that calls to get tick count takes time, etc, but basically it worked for our purposes. How to make sure to call StartTickCount() at the beginning of each function and EndTickCount() at each exit point:
Private Function SomeFuction() as String
' indicate the function started
StartTickCount("MyClass.SomeFunction")
' some logic that causes the function to end
[Code] .....
Anyway, is there any functionality built in, either through the VS 2010 debugger or in the System.Reflection namespace, to do something similar in VB.NET? Basically, what I want is to log the number of times each function is called, the total amount to time spent in that function, the average number of seconds spent in that function, and the maximum amount of time spent in a single call in that function.
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Aug 27, 2010
Is there a way to include an ActiveX to VB .NET project without adding it to a form?
If I add it to the form and call a function on it that blocks, the UI is unresponsive until the function returns. Even if I am making the call in a different thread.
I was able to compile the code when I did not include it via the form, but got this error once I called a function on it.
Catastrophic failure (Exception from HRESULT: 0x8000FFFF (E_UNEXPECTED))
How could I make the UI responsive when the ActiveX functions are blocking?
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May 25, 2010
I have an application that I am reworking. It has many reports and a pain to compile and roll out.I'd like to make a root user interface that "calls" the functions and subs remotely.I was concidering pulling them and making formless exe's of them, passing the needed criteria via command line. Yet still be able to update and control them.
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May 8, 2010
What the Win32 API is? I have looked around but no where really outlines what it is. Is it basically a set of procedures, outlined by Microsoft for programmers in order to get services from the operating system? In essence is it the equivalent to making system calls abd and library calls in UNIX? And yes I now Windows makes library calls too.
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Oct 1, 2009
I'm working with the DevExpress XtraGrid control.I have a routine that goes thru and adds all the controls on the current form dynamically, and launches on a seperate thread the routine for a given control to initialize it to the value that will be displayed to the end-user. Some of the controls are displaying calculated values, and take some time to return their values, so that's why we are doing it on a seperate thread.
[Code]...
I'm using a similar snippet of code for any control properties that have to be updated, and all work fine. On the above code when the actual Invoke is called, it APPEARS that the thread just ends and never calls the delegate, and doesn't return to finish either.
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May 31, 2009
I'm just starting to look at Custom Controls after watching a MS video online. Video Training - WindowsClient.net I wondered if it's possible to get the name of the control that calls the OnEnter event that I am running.
[Code]...
I wanted to add a new combobox to the form and it always call this GetComboList each time OnEnter BUT I need to pass the combobox that the onEnter is firing from. Would save code and give me an insight into how custom controls work.
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Nov 30, 2010
MSDN brings nothing up, so here was my attempt at a work around.
[code]...
Because event leave calls another sub i need the last active control. I have the textbox name txtTime{0} but obviously string is not a control.
So Two questions:
1) can a string value be attached to an existing control if i know it's name? Dim attControl as Control = newTime
2) All this could be avoided in event leave if i could get the left controls name. I have tried sender. tostring etc but nothing returns the textboxs name
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Jan 12, 2010
how can i get activex contol for firefox 3.0.17
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Sep 28, 2011
Do we have an activex control for sending sms using a modem?
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Apr 27, 2009
I created an ActiveX Control in ATL, which I can succesfully use in for instance Internet Explorer. When I want to put that object in a VB.NET (2003) app, I get some problems.
First I 'Import' the control, using Visual Studio, so there are COM Interop DLLs created. Then I insert the control in the toolbox and drag/drop on a form. The control is succesfully created.
However, when I run the VBApp, it crashes. The debugger tells me that it gets a 'Class Not Registered' error.
Same when I create a pushbutton and create the object manually:
Code:
Dim AxQuest3DCtrl As Object
AxQuest3DCtrl = CreateObject("MyControl.MyCtrl.1") //crashes here
If AxQuest3DCtrl Is Nothing Then
[Code]....
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May 5, 2010
I wont to add swf file to my Vb.net project. I'm using Visual Studio 2010. How can i insert swf file to vb.net project ?
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Jan 23, 2010
Working on getting a legacy app up and running again for work. I'm getting an error at run time that I can't create an activeX control. The suspect call is
oSQL = CreateObject("SQLDMO.SQLServer2")
I did a bit of googling and found that SQLDMO should be in a SQLDMO.dll. I've got that DLL referenced in my project but it is still failing.
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Jul 9, 2009
I have a legacy VB6 ActiveX control used in IE to provide control of a parallel-port device from a browser application. I wrote this thing about five years ago; It's a pretty simple control, and it doesn't require a lot of maintenance. However, I've noticed that running the VB6 tools is becoming more and more painful over time, so I'm looking at the possibility of migrating this code to VB.net 2008.This thing is super-simple. It implements IObjectSafety and exposes a single public method, which we call using Javascript. The control has no UI other than a single box with a caption that displays its name and version number-- useful for troubleshooting deployment issues.
How would I create the equivalent in .net? Am I creating an applet? Or a .net Assembly? Any gotchas to look for as I try to make this transition?(I should make it clear here that I'm not either a VB6 programmer or a .net developer-- I've dabbled in this stuff but it isn't my area of expertise, so go easy on me).
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Apr 11, 2011
I am using the WebBrowser control in Rockwell Automation's Factory Talk SE v. 6.0 to display a PDF file. Within the "Display_AnimationStart" routine, I call the function below to send a ctrl+h to the system to hide the toolbars, which has proven to be quite unreliable.
Is there a more direct, object-specific way to hide the browser's toolbars other than the SendKeys method?
Private Sub LoadPDF(Filepath As String)
SendKeys "^h", True
Me.WebBrowser1.Navigate2 (Filepath)
End Sub
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Jun 15, 2010
I'm developing in VS2005 on WS 2008 and I've created a windows application containing the webbrowser control.I am trying to run a page containing an activex control, the download prompt for the cab file appears even though the control is installed and running in IE on this machine.Also if I navigate to a site containing Flash, the content is not shown as if Flash is not installed, but it is and again runs fine in IE
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May 8, 2011
I have 10 PictureBox on a windows form (created in Design View) and a context menu strip is attached to each of them. I am trying to set the property of the PictureBox using the context menu.
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Jan 14, 2011
On a given application form, I have around 20 controls that I need to set in the main form. I have a separate thread that only needs to ready some properties from the controls on the application form It will never try to write to the form's controls.
[Code]...
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Mar 25, 2010
I have the need to embed what I want to call an ActiveX component into a webpage on my intranet. The reason I want to do this is, I'd like to check if a USB security token is inserted on the end users PC.
My question is: what do I need to be researching to accomplish creating a control which can be embedded into Internet Explorer when programming in VB.NET?
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Dec 31, 2009
I am developing an application in Visual Basic under Visual Studio 2008 Professional. As part of this application I am using a third-party ActiveX control (.ocx file). After building the installer (.msi file) using the deployment tools in Visual Studio, I tested it on a clean system. The install appeared to run successfully--folders are created, files are copied, and the .ocx is registered. However, when I tried to run the application I received an error telling me "You must have a license to use this ActiveX control." This would be expected on the development machine, but should not happen on the client system, i.e., in the runtime environment.
On previous builds of the application, I did not receive this error. Besides updates to the application itself (the part I created, that is), I was using NSIS to create the installer, rather than the tools in Visual Studio. The application cannot run without the .ocx in question, so this error is a show-stopper.
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Dec 6, 2011
i am creating an activeX control... in this control i want to manage what the tab key does. i may a user interface that allows tabs in the textbox or it might move the user to the next screen. i have everything working in the IDE, but when my activeX is loaded into the 3rd party application the tabs no longer trigger the key down event. i assume this is because the parent application has tab stops is there a way on a control by control basis to stop the normal execution of tabs?
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Jul 10, 2009
I am trying to embed an activex control (.ocx) created using VB6.0. It's a bare bones usercontrol with no extra code, just for testing purposes. But when I embed this control in one of our windows forms in our legacy development environment (Gupta Centura V3.1), running as an MDI child in an MDI context, the main menu bar of our runtime MDI disappears.
[Code]...
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Jun 7, 2006
I am using VB2005 express and VC#2005 express. With my old friend VS2003, whenever i needed to add flash to my WInforms, all i needed to do was to add the control as a com component and drag it on the stage from the toolbar. Now, when i did the same in new express version, althogh it is added in the toolbars and the references list, but still, whenever i try to drag a shockwave flash instance on my win form, i get the error: Failed to import ActiveX control, please ensure it is properly registered.
does some one have any idea how to add flash comntrol as we used to do in earlier versions?
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Aug 11, 2011
I am writing a customized data acquisition application in VB2010. The maker of the data acquisition hardware has provided an ActiveX control that has methods, properties, and events that can be used to interface with the hardware device.My problem is that I'd like to reference the same control (ideally the same instance of the control) on multiple forms.
To begin, it is necessary to initialize the device, sending the control information like sample rate, number of channels, etc. Then you can use methods to start or stop getting data and read properties, like the number of samples taken, or an array of the
actual data. The device also provides events, like a DataReady event that fires when a certain number of samples have been taken, and a DeviceError event that fires if the device is not present.
My program will have several forms:
1) a main menu that opens on startup and that should initialize the unit and determine whether it is present.
2) a daily check form that will get values from the device to determine whether the electronics are good.
3) a test setup form that will get values from the device to zero (tare) the input channels.
4) a run test form that will acquire and process the actual test data.
If I include separate instances of the control on each form, I need to initialize and stop the control when the forms open and close. I started to build an interface class that the forms could share and that would deal with all of the methods, but I get tripped up trying to pass the control's events back to the form.
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