Transcript

00:01Hello, and welcome to Migrating from Visual Basic 6 to Visual Basic 2008.

00:06This is our second video and this is our case study #2, where we're going to convert...

00:11...and intermediate level ArcMap command.

00:15The functionality is going to be a button that has an image on it this time...

00:19...and it's going to launch a Windows form.

00:21And on that form, you will have the ability to wire up some events and to display a count...

00:26...of the number of selected records.

00:28I'm Don Kemlage, I'm a product specialist at Esri, so let's go ahead and get started.

00:34Well, this process is going to involve five steps.

00:38Our first step is going to be to test and review the original Visual Basic 6 project.

00:43Then we're going to use Visual Studio 2008 to convert the Visual Basic 6 project...

00:48...into a Visual Studio 2008 version.

00:53Then we're going to fix the code inside the Visual Studio 2008 project...

00:57...and we're going to test it for functional equivalence to make sure that it behaves...

01:01...exactly like it was supposed to inside of Visual Basic 6.

01:05Then we'll go through and we'll do some updates in the Visual Studio 2008 project...

01:09...and we'll try to get it to conform to some .NET standards and...

01:13...take advantage of some best practices.

01:15And then the final thing that we're going to do is we're going to port some of our code...

01:19...to a new Visual Basic 2008 project that takes advantage of the Esri base classes.

01:26And we'll see if we can even make development even easier by using these.

01:31So let's go ahead and get started.

01:34So on this part, we'll test and review the VB 6 project.

01:38Here we have a copy of ArcMap open with a default set of layers.

01:42We'll go head and open our Customize dialog and we'll choose Add from file.

01:50And we'll select our Project1.dll.

01:54This is the class we want to add.

01:56And in the Developer Samples, we'll see that we have an event VB 6.

01:59I'll drag it onto the GUI.

02:05And when I click, it launches a dialog where we can wire up...

02:09...the maps selection changed event.

02:12Before we click the Wire Up the Map's Selection Changed Event...

02:15...we need to make sure and set our first layer as being the only selectable layer.

02:20And the way to do that is we'll make our ArcMap application active.

02:24We'll right-click on the first layer and choose Selection...

02:28...Make This The Only Selectable Layer.

02:31And then we'll bring our Windows form back up.

02:34So we'll click this button -- it will ask us to go through and select some features.

02:41I'll select a few features.

02:46And the dialog says we have five counted.

02:48And you can select some more features.

02:52And the Selection Count changes.

02:56If we go over and look inside the VB 6 project that it took to make this functionality...

03:01...we'll find that we have a class, clsEvents of which it implements ICommand...

03:07...and this is standard polymorphic behavior.

03:10And we can go through and see all the different properties and methods...

03:14...that are available.

03:15One that I want to draw your attention to is the ICommand_Bitmap.

03:20And if we review the code, we find out that it's coming from frmResources...

03:25...the Image List1, the List Images, and then grabbing the first one...

03:29...and then it's getting the picture, and then the Handle -- and that's being returned back.

03:34And so if we were to go look at this, frmResources, we'll find that it's a...

03:39...Windows form and this is where the image list is.

03:42And if we open up its Properties, and then we go to the Images tab, we find that our image...

03:48...is added here, and this corresponds to the image that you saw on the ArcMap GUI.

03:54It should be noted that this form never actually displays.

03:57It gets created as part of the VB 6 project, but yet, a user would never interact with this.

04:03The only form that we interact with is the frmEvents...

04:07...and this has the functionality that we're used to.

04:11And if we look at the code behind...

04:14...we'll find that our hook gets passed in through this Property Let...

04:19...with the Application and then it goes through...

04:22...and we have a global variable of a Private WithEvents, which is...

04:25...m_pActiveViewEvents As Map.

04:31And it goes through and it gets the selection changed and displays the string...

04:35...inside of the Windows form and the Command1 Click just calls this event.

04:42At this point, we'll use Visual Studio 2008 to convert the VB6 project.

04:48So I have a Visual Basic 2008 project, and I will choose File > Convert.

04:53And I'll choose the Visual Basic 2008 Upgrade Wizard -- and I'll choose Next.

04:59I'll specify the project, which points to the VB 6 project -- and I'll choose Open.

05:07I'm happy with that -- I'll choose Next.

05:10It's going to be a DLL -- we'll choose Next.

05:13I'll specify an output project -- I'll choose Next.

05:24I'll want to create the folder now -- I'll choose Next.

05:31And we'll let the process run.

05:35And when the code converter's done, we'll have our project done of which we can save it.

05:41And we can see it on the hard drive.

05:49Now that our project has been converted to Visual Basic .NET...

05:53...we'll go through and do a compile and check for any errors...

05:56...and then test its Visual Basic equivalency.

06:00I like to start my making a copy of the original...

06:03...conversion projects, so I'll do a CTRL+C, and a CTRL+V, and I'll rename this...

06:11...to be VB2008_Equivalency.

06:14So we'll go ahead and open that up and open this version of the Solution File.

06:21The first thing we should do once the project is open, is build it.

06:26And we'll discover that we have five errors and one warning...

06:29...so let's go ahead and start making our changes.

06:39We'll start with clsEvents.vb.

06:45And the first thing we'll do is we'll rename the name of it to...

06:50... 2008 so we won't have a conflict with our VB6 project.

07:01All right, let's go see what our errors are.

07:03So the "Class clsEvents must implement ReadOnly Property Bitmap As Integer."

07:08We've seen this before in the prior case study, so we'll go through and we'll...

07:11...go immediately down to the ICommand bitmap and we're not going to...

07:15...pass back an OLE HANDLE; but rather, a system integer.

07:25It turns out that Windows forms behave differently...

07:27...in Visual Basic 2008 than they do in VB 6.

07:32And we're not going to be able to take advantage of this frmResources as it...

07:37...currently sits in order to obtain the handle of the image to be displayed on the button.

07:44So what we need to do is we're going to create some member variables...

07:49...and we'll do that near the top of the class file.

08:06And what these member variables are is we're going to have a m_frmResources...

08:13...as new frmResources.

08:15And if we go and we look at our Solution Explorer, we'll find that we do have...

08:19...frmResources, which was translated from before.

08:22We're also going to take advantage of a structure, which is a platform-specific type...

08:26...used to represent a pointer or a handle, so we're going to call this m_hBitmap.

08:32And we're also going to add an m_application to represent the IApplication variable...

08:37...that's going to be passed in as the hook.

08:41So let's go ahead and do some work to that ICommand_Bitmap property.

08:45What is coming out was originally provided so we can learn from it.

08:49And we're going to create an image list from the form, so we'll Dim imagelist As...

09:00...ImageList, and that's going to be equal to our m_frmResources.ImageList1.

09:09And we're also going to give image collection...

09:16...and that's going to be as an ImageList.ImageCollection.

09:22And that's going to come from our imagelist.

09:26And we use IntelliSense to get to our images, which returns an image collection.

09:34And we're going to go through and get the individual image.

09:42And that's going to come from our image collection.

09:45And we're going to get the first item.

09:48Notice how item (0) is the first item in VB.NET.

09:53And we're going to create a bitmap.

09:59And that's going to equal to our image cast as a bitmap.

10:10We need to set what the transparency is going to be on our bitmap as well.

10:14So we'll do that here.

10:20And we want the upper-left pixel to be the transparency point.

10:28And then, finally, we want to get our handle.

10:34And that's going to be equal to our bitmap.

10:44And we're going to want to return that.

10:50But we need to make sure and return it as an integer.

11:01Unfortunately, with Visual Basic 2008, because we're actually taking advantage...

11:06...of a pointer, we need to release the memory.

11:09And in order to do that, we're going to have to make a Windows API call.

11:13And I happen to have some code that I've had from before...

11:16...so I'll go ahead and copy that into the project.

11:18You can certainly learn more about that if you want.

11:21But basically what we're going to do is we're going to call a Private Shared Function...

11:25...called "DeleteObject."

11:26And we're going to pass in our IntPtr.

11:30And what it's going to be defined as is a system.Runtime.InteropServices.DllImport.

11:37And we're going to take advantage of the gdi32.dll.

11:41And this is basically establishing...

11:43...the signature for the Windows API call that we're going to make.

11:48And then finally, in order to release this memory, what we need to do...

11:52...is we're going to go through and we're going to take advantage of our Finalize.

11:57And inside of the Finalize, in fact I'm going to copy and paste to a better location.

12:07We'll put it right below the API call.

12:12We're going to change some of the behavior of the Finalize.

12:15And what we're going to do is we're going to say, If our (m_hBitmap.ToInt32() <> 0, then...

12:33...we're going to call the DeleteObject function.

12:37And we're going to pass in our (m_hBitmap).

12:45And that will do any garbage collection and free up any memory on the image...

12:49...once the ArcMap application is closed down.

12:52So at this point, let's see how we're doing on our errors.

12:55So we have two errors so far.

12:57We have the Property ICommand does not return a value on all code paths.

13:02Well that's probably east to fix, so why don't we go ahead and check that one...

13:04...and we'll just return -- and Nothing.

13:09Let's see what other errors we got: Reference to a non-shared member.

13:15So if we go back and we look at our ICommand_OnCreate...

13:19...it was passing in the hook to the frmEvents an application property.

13:26So if we were to go look at our Solution Explorer and go to our frmEvents...

13:32...and then look at the code for it, we see that we have an application property...

13:35...and we were passing it to it automatically.

13:38So we're going to have to do a little bit of changing there in order to keep this...

13:44...functionality consistent, so why don't we go ahead and we'll comment out that line for now.

13:49And why don't we go through and do an m_application...

13:54...member variable that we had set before, and why don't we set that equal to...

14:01...our hook variable that came through.

14:04Of course, we need to cast that to a specific type so that would be...

14:07...ESRI.ArcGIS.Framwork.IApplication.

14:13And we'll just leave that as it is, and we'll actually put more of the logic of setting...

14:17...the Application inside of the OnClick event.

14:20So we'll change our frm.Events.Show...

14:27...and we'll change that to, we actually need to declare...

14:30...an instance of our frmEvents.

14:32We'll do frm As New frmEvents.

14:38And then we'll do frmEvents. and we'll be able to take advantage of our application...

14:47And we'll set that = m_ application.

14:52And then, finally, we need to show our frmEvents.Show.

14:57And so we'll just do our build one more time just to make sure that...

15:01...we did, in fact, get all of our errors.

15:04And if we check, we have no errors and no warnings.

15:06So at this point in time, why don't we go through and make sure and change...

15:10...some of the project properties: Events and our Root namespace as well.

15:20We need to check for COM interop in our Compile tab.

15:26And in our Debug tab, we want to set our external program to be ArcMap.exe.

15:38The last thing we should probably do is make sure there is no extraneous reference...

15:41...added to this project.

15:49And we see that there is quite a few, so let's go back and look and see what we had...

15:52...inside of a Visual Basic 6 project.

15:57We see that we only needed ArcMap, ArcMapUI, Carto, Framework, System...

16:02...SystemUI, and GeoDatabase.

16:08So back inside of our .NET project, let's get rid of the ones we really don't need.

16:14So we'll get rid of CartoUI, Catalog, DataSources, DataSourcesRaster, Display...

16:21...GeoDatabaseExtensions, GeoDatabaseUI, Geometry, GISClient, Output, and Server.

16:35Let's make sure our project can still compile.

16:40Everything looks good, so why don't we test it inside of ArcMap?

16:47And when ArcMap opens, we'll choose a default project.

16:54We'll add from file.

17:03We'll make sure and choose the .tlb file.

17:07Our objects are added with the Developer Samples category being selected...

17:12...we can copy our events VB 2008 onto our GUI.

17:19And we can test the functionality.

17:23And let's not forget to set our selectable layer.

17:25I'll do it an alternative way by doing Selection > Set Selectable Layers.

17:34So while we're at Events, I'll select some features.

17:41We have three selected -- we'll change to some additional ones.

17:46We'll hold down the SHIFT key and select even more -- and we find that we have 8!

17:53So our functionality is equivalent.

17:58At this point in time, we probably ought to update our project...

18:02...take advantage of some of the best practices that are available inside of .NET.

18:06Now, I did this before in the first case-study video...

18:09...and we spent a considerable amount of time doing that.

18:11I'm going to do the same types of changes in this project as I did in the prior one...

18:16...except I'm not going to go with the same pace; I'm going to put the video recording...

18:19...mode in a lot faster when I'm actually making the changes and I will talk less...

18:24...but I'll tell you ahead of time what I'm going to do.

18:26And that way, we can spend more time on the next section...

18:29...which will be about taking advantage of the Esri base classes.

18:33So let's go ahead and get started.

18:34I'll start by making a copy of the original Equivalency project...

18:38...and then we'll use that for the next set of editing.

18:50Now that the project's open, we'll go ahead and get rid of any extraneous files...

18:54...that aren't necessary for the running of the project.

19:02And now we'll get rid of any extraneous references...

19:04...that might be in the project that aren't necessary.

19:11So let's go ahead and rebuild the project to make sure there aren't any errors or warnings.

19:18And as we can see, we have a namespace compatibility.

19:21We actually saw this issue before...

19:23...and that's under the Project Properties and we'll go ahead and remove that.

19:34And let's rebuild our project.

19:38And all of our Errors and Warnings are gone.

19:40Let's open up our clsEvents.vb file.

19:43And we'll turn the Option Strict on and fix any casting errors if there are any.

19:50I will also, at this point in time, change the return arguments for each one of the...

19:56...property types instead of by its name by using the return statement.

20:22I'll change the name of the command...

20:24...and the caption so we don't have a conflict with our prior version.

20:32And I'll also put some comments in the code so it makes it more useful for the future.

21:14And at this point in time...

21:15...we'll build the project to make sure we don't have any errors or warnings.

21:21And everything looks good.

21:24There's one other class file that we're going to need to edit and make changes to...

21:27...and that's the frmEvents.vb.

21:34So let's go ahead and follow the same pattern of editing this code.

21:38First, we'll turn on the Options Strict and fix any casting errors.

22:04And we'll do a rebuild to make sure we got them all correctly.

22:10And we have no Errors or Warnings.

22:13And we'll go ahead and add the import statements near the top of the class file...

22:16...so that we can shorten our syntax as we're doing our editing.

22:22I'll also do some renaming of variables that I believe conform more to .NET standards.

22:49I'll also go through and do some code rearrangement such that the declaration...

22:52...and instantiation of objects can happen on the same line wherever possible...

22:56...and make the flow a little nicer.

23:32I'll also go through and shorten up some of the syntax...

23:35...so that it's not quite so long on the screen and requires less scrolling around.

24:14And I'll rebuild the project to make sure there's no errors -- no Errors, no Warnings.

24:22I'll also go through and do a little more code rearrangement to make some of the...

24:26...arguments look less complicated.

25:33And we'll rebuild the project to make sure there's no errors -- no Errors, no Warnings.

25:42I'll also add a few comments to the code to make it look more understandable...

25:46...for future longevity.

26:15And we'll rebuild the project.

26:19And we have no Errors and no Warnings.

26:22At this point in time, we can test the project inside of ArcMap...

26:25...to make sure that we still have functional equivalence.

26:40And here's our version 2.

26:45We'll set our selectable layers...

27:00...and we selected our features, so we have a functional equivalent.

27:05The final step that we want to accomplish is...

27:07...we want to take advantage of the Esri base classes.

27:09And we're going to port some code from the prior project...

27:13...and this is all going to be done inside of Visual Studio 2008.

27:16And this new project that we're going to take advantage of...

27:19...we're actually going to do some events a little differently, and we're also going to...

27:22...take advantage of the bitmap a little differently as well.

27:25So let's go ahead and get started.

27:28So with Visual Studio 2008 open, we'll choose File > New Project.

27:34We want a Visual Basic, ArcGIS, Desktop.

27:37We want a Class Library (ArcMap).

27:39We'll change the name to Events2008.

27:43And when the ArcGIS Project Wizard opens, this time we'll go ahead and add some...

27:48...references to our project, Alphabetical, and we'll select our references.

27:55We'll add ArcMap, I'll hold down the CTRL key, ArcMapUI, Carto, Framework...

28:09...GeoDatabase, System, and SystemUI, and we'll click the Add button and choose Finish.

28:18And once the project is completed, we'll delete the initial class file.

28:25And we'll choose Add > New Item, and we'll choose ArcGIS...

28:32...and we'll choose a Base Command and we'll give it the name of "clsEvents.vb"

28:39And we'll click Add; we'll choose Desktop ArcMap Command, and click OK.

28:47And at this point in time, we'll save our project.

28:50And we'll give it this name and in this location.

28:54You're going to notice that there's a bitmap that's created for us automatically...

28:57...and you can double-click to open it up and it looks like a bunny.

29:01We'll close that down for now.

29:03And, remember in the VB 6 project, we actually had our own image...

29:07...and we translated that into the into the vb.NET project.

29:12The problem with that was is we had to go through that and use some Windows API...

29:15...calls to delete memory when we were done with it, and we had to do some interesting...

29:19...tricks to take advantage of that image.

29:22So what we're going to do this time is we're going to take advantage of the image...

29:25...in this project, but in a different way.

29:28And I'm going to start off by deleting this existing bitmap; but, we'll remember its name.

29:37And we'll open up Windows Explorer and we'll go to the VB6 project...

29:41...and we'll copy the events.bmp file, which was in the VB6 project and we'll put it in...

29:46...inside of our new Events2008 project, so we'll do a CTRL+C...

29:54...put it right at this level, but we'll rename it.

30:01And the name that we will give it will be "cls.Events.bmp."

30:09We'll go back to our Visual Studio project.

30:14We'll expand out to everything and we'll notice that here's our clsEvents.

30:17Now, what we need to do is we need to include this in the project...

30:20...but that's insufficient; now, we need to right-click and choose Properties...

30:26...and make sure that the Build Action is an Embedded Resource.

30:31Now, if we go back to our Solution Explorer, and view the bitmap...

30:36...we'll see that we have the image that we're looking for...

30:39...and we'll rebuild a solution to make sure that there's no errors.

30:42And everything succeeds just the way that it should.

30:47At this point in time, we'll make some changes to the Base Class properties.

30:53And fill in our options for our category, our caption, and our name.

31:03If you remember back to the prior project, inside of the OnClick event...

31:08...we went through and we launched the Windows form, which did all the...

31:12...event procedure and had all the fun stuff that we were looking for...

31:15...inside of our ArcMap commands.

31:17So why don't we go back to our old project and why don't we copy the code...

31:22...from the OnClick event.

31:25And we'll copy that into our new project.

31:32And the first thing you're going to notice is there's no frmEvents.

31:36Well, why don't we borrow the code from the other project as well as far as its frmEvents...

31:41...so we don't have to do as much work.

31:43The way we can do that is we'll open up Windows Explorer.

31:48We'll go back to the old project, which was VB2008_Equivalency2.

31:53And let's copy our frmEvents dialog; we'll do CTRL+C and a CTRL+V...

32:05...and we'll go back into our new project, and we'll add this form.

32:09So we'll choose Add, this time we'll choose an Existing Item...

32:13...and we'll choose our frmEvents.

32:18Now, I want you to notice off the bat is notice how this icon looks like a little code file.

32:22It doesn't look like a Windows form -- well, why is that?

32:25We'll, if we expand our references, we will find that we don't have a...

32:29...System.Windows.forms, so we might as well go ahead and add that now.

32:35And now that the add reference dialog is open, we'll scroll down to the...

32:38...System.Windows.Forms and we'll add it to our project.

32:45Notice how our icon is now changed to a little form.

32:48And, also, our error message went away as well.

32:52So let's go ahead and open up our Windows form.

33:01And we'll see that everything looks just as it did in the prior project.

33:04Except this time, with vb.NET, we can actually take advantage of not only...

33:09...wiring up the map's SelectionChanged Event, we can also unwire it...

33:14...to remove the functionality as well while the project is actually...

33:18...running inside of ArcMap -- so let's show you how to do that.

33:22We'll increase the size of our form, and we'll make a copy of this button.

33:26I'll do a CTRL+C, and a CTRL+V; we'll move it down a little bit inside of the dialog.

33:33We'll do a right-click and choose Properties.

33:37We'll change the Text on it; instead of "Wire," we'll say "Un-wire."

33:42We'll also give it a name.

33:45We'll call it "BtnUnwire."

33:52And then we'll double-click on this button.

33:55I want to show you something different about wiring up events inside of...

34:00...Visual Basic.NET that can be done differently than Visual Basic 6.

34:04Now, while we could have used the Private WithEvents keyword to wire up an event...

34:10...that has some limitations in that you can't dynamically unwire events and there are...

34:14...some other limitations that you can read about in the documentation as well.

34:17I want to show you an alternative about how we can do that.

34:20So let's comment out that line right now and let's do it slightly differently.

34:24And the way that we'll do it is we'll say "private m_map_Events As"...

34:34..."IActiveViewEvents."

34:40But what you need to do, and you're going to have to read this inside the documentation...

34:43...you want to put another _Event on the end of it.

34:50And this will wire up our m_map_Events As an ESRI.ArcGIS.Carto...

34:56....IActiveViewEvents_Event.

35:01If you remember back in the prior project as well...

35:05...that there was a Private Sub m_pActiveViewEvents_SelectionChanged...

35:11...which did the Handles of the m_map_Events.SelectionChanged.

35:17What we're going to do is we're going to change the signature to the Sub...

35:20...but we'll keep all the functionality exactly the same.

35:24And that signature is going to be Private Sub OnActiveViewEventsSelectionChanged.

35:31But the functionality will remain the same.

35:33And what we'll do is we'll wire up a delegate that calls this function interactively.

35:39Let's see how we can do that.

35:41And this would be done inside of the Command1.Click...

35:44...so let's scroll down and find that.

35:46And the way the wiring was done before was m_map_Events was equal to the map...

35:51...and then we cast it to the map interface.

35:54This is going to be done differently.

35:55What we're going to do is we're not going to cast it to the map interface...

35:59...but we're going to cast it to the ESRI.ArcGIS.Carto.IActiveViewEvents_Event.

36:13And we're not done yet -- that just gets this variable hooked up.

36:16But we actually want to add the Handler, which does the delegate work.

36:20And that's done by doing the following...

36:23....AddHandler m_map_Events. SelectionChanged,AddressOf...

36:36...the name of the Sub we had changed the signature to above.

36:42So we can even just copy and paste that right here.

36:51And that's it!

37:35...our OnActiveViewEventsSelectionChanged and that's all we need to do.

37:41So let's go ahead and add a few code comments in here...

37:44...for longevity purposes and then we'll test the project.

37:49So here are some comments that I promised...

37:53...for about the EventHandler and how it's different, so you can read about that later...

37:58...through the EDN document series.

38:01And here are some comments for the AddHandler...

38:04...and some comments for the RemoveHandler.

38:06So at this point in time, we should be able to build the project and we have...

38:11...no Errors and Warnings, and we should be able to test this inside of ArcMap.

38:17And we'll choose Tools > Customize, and in our Developer Samples...

38:23...here is our Events VB2008 via Base Class; we'll copy that under the GUI.

38:31And we'll test the functionality -- don't forget to set the selectable layers.

38:39We'll click on the Wire Up the Map's SelectionChanged Event.

38:44Click Select Features.

38:49Notice four features are selected.

38:51I'll change it and select just two features.

38:55And notice only two features are selected.

39:00And now I'll click the Un-Wire the Map's SelectionChangedEvent.

39:05And I'll select some features.

39:09And notice our selection count didn't change, but yet if I go and wire up...

39:14...the Map's SelectionChanged Event and select some events...

39:18...we have a Selection Count changed.

39:20And this concludes our second series in our case studies.

39:24And I hope it's been instructive for you -- thank you.

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How To Migrate a VB6 project to .NET - Complex Project

In this video, Don Kemlage from Esri's ArcGIS product team walks through the process of converting a project from VB6 to VB.NET. This focuses on migrating a moderately complicated ArcMap Command from VB6 to VB.NET. Topics of handling the Command's image, interacting with a user-created Windows Form, and wiring up events are discussed as one migrates from VB6 to VB.NET.

  • Recorded: May 13th, 2010
  • Runtime: 39:27
  • Views: 656
  • Published: Aug 18th, 2011
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