Visual Basic

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String and Object militiaware13-Sep-05 15:31 militiaware 13-Sep-05 15:31  it's easy to save the object in the registry as string... but how to convert that string (after getting it from the REG) to an object telling the converter: "this is the context of this object type". i tried using the typeDescriptor, but no help. who can help! i need and excutable example (VB.NET code) using the Color Object!! militiaware Re: String and Object rwestgraham13-Sep-05 15:45 rwestgraham 13-Sep-05 15:45  I would suggest that you save the color in the ARGB for which is a 32 bit value. You can obtain this from the Color object by the Color.ToArgb method. You can then save this integer in the registry, read it back later and convert it back to a color object using the Color.FromArgb method. Excel and vbscript netmeister13-Sep-05 11:32 netmeister 13-Sep-05 11:32  I'm trying to write an XLS file from within a asp page. Have it working but can't find how to format Cells. Can do color and font but can't find how to do date and time formats. objexcel.Range("A1:J2").Select objexcel.Selection.Font.Bold=TRUE objexcel.Selection.Interior.ColorIndex=41 objexcel.Selection.Interior.Pattern=1 'xlSolid objexcel.Selection.Font.ColorIndex=2 All this works but been all over MSDN and google but can'find how to set cell properties so date and times are formatted correctly. automate saving a web page? gtjr9213-Sep-05 8:36 gtjr92 13-Sep-05 8:36  I want to create a VB.net script that will save a web site to a file. How can i do this? I actually will want to save several pages. This would be a weekly job. I know how to create jobs in job scheduler. I don't know how to do the VB. I know one way would be to use httpwebrequest and response but not sure how. The Vb would direct my IE browser to a site then in IE it would save the file to a particular folder as "HTM web file only". (The default file save is a "web page complete" I don't want that) Then I need to dynamically name the file, otherwise they will all be named the same thing. I was thinking maybe there is a way to create some sort of macro even? Help is greatly appreciated Dynamic Context Menu No-e13-Sep-05 8:26 No-e 13-Sep-05 8:26  I am stuck with context menus and seem to be spinning my wheels. I want to build a context menu in code, then perform actions based on the item selected. I could do something like Private Sub Form2_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load Dim ContextMenu1 = New System.Windows.Forms.ContextMenu Dim MenuItem1 = New System.Windows.Forms.MenuItem Dim MenuItem2 = New System.Windows.Forms.MenuItem ContextMenu1.MenuItems.AddRange(New System.Windows.Forms.MenuItem() {MenuItem1, MenuItem2}) MenuItem1.Index = 0 MenuItem1.Text = "MenuText1" MenuItem2.Index = 1 MenuItem2.Text = "MenuText2" Button1.ContextMenu = ContextMenu1 End Sub I would prefer to read each of the menu items ("MenuText1" and "MenuText2")from a config file as they change quite a bit and I would prefer to not hard code them. To handle the click, I would need something like this: Private Sub MenuItemSelected_click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles menuitem1.click, MenuItem2.click ' code to handle event goes here... ' prefer to figure out the index of the item clicked and process accordingly End Sub The problem is that the compiler does not know the MenuItem1.Click or MenuItem2.click events. Someone suggested a way to do this in C earlier, it looks like it would work in C but I am not sure how to implement in VB. Any help is appreciated Re: Dynamic Context Menu Steve Pullan13-Sep-05 13:36 Steve Pullan 13-Sep-05 13:36  Part of the solution is to define the menu item objects WithEvents thus: Dim WithEvents MenuItem1 As New System.Windows.Forms.MenuItem Dim WithEvents MenuItem2 As New System.Windows.Forms.MenuItem Dim WithEvents MenuItem3 ... etc. You'll then be able to trap the MenuItemx_Click() events. A couple of drawbacks though: you cannot define local objects WithEvents, nor can WithEvents be associated with arrays so you'll need to define a bunch of menu item objects with global scope within your class to cater for the maximum number of expected menu items in your config file. I have had no reason to do dynamic context menus so I'd also be interested in other people's solutions. ...Steve -- modified at 19:38 Tuesday 13th September, 2005 Re: Dynamic Context Menu Briga15-Sep-05 23:23 Briga 15-Sep-05 23:23  By looking at the code it looks like that you defined menuitem* inside the sub Form_load and therefore they are "local" objects. The compiler correctly don't know them (they exist only inside the form_load). Try to declare them as "global" to the class (adding the withevents clause as stated in the other reply) and then it should be ok. Visual Basic .NET Standard vs. SQL Server 2000 Developer Edition medicenpringles13-Sep-05 8:18 medicenpringles 13-Sep-05 8:18  I just purchased SQL Server 2000 Developer Edition yesterday from Amazon, and i'm disapointed. when i finally got it up an running, i went to the server explorer in my VB.NET Standard, and when i tried to connect to a database, it said: "Unable to connect to database. It is only possible to connect to SQL Server Desktop Engine databases and Microsoft Access databases with this version of Visual Studio." wtf is up with that? do i need Visual Studio Professional? Enterprise? or do i really have to spend the $2500 on Enterprise Architect? i thought the $50 price tag on SQL Server 2000 Developer Edition meant it was intended for low-budget developers, and considering the $109 price tag on VB.NET Standard, i thought they would go hand-in hand. apparently not. i can connect to the database programmatically just fine, but the inability to do it visualy is very dissapointing any help is appreciated. stephen Re: Visual Basic .NET Standard vs. SQL Server 2000 Developer Edition Dave Kreskowiak13-Sep-05 8:50 Dave Kreskowiak 13-Sep-05 8:50  medicenpringles wrote: but the inability to do it visualy is very dissapointing You're not missing much. I prefer to do my database work in the Enterprise Manager of SQL Server anyway. Hand coding the database code is a much cleaner approach. All your code is contained to exactly where you put it instead of where the Designer wants to put it. The Standard Edition of Visual Studio won't connect the Server Explorer to SQL Server. It's limited to the desktop databases only. Visual Studio Professional and above will work though. RageInTheMachine9532 "...a pungent, ghastly, stinky piece of cheese!" -- The Roaming Gnome Re: Visual Basic .NET Standard vs. SQL Server 2000 Developer Edition medicenpringles13-Sep-05 9:41 medicenpringles 13-Sep-05 9:41  well to be honest, the only real reason i got Developer Edition was for the enterprise manager. if i only used the free Desktop Engine, would Enterprise Manager sill work with maintaining the databases on the Desktop Engine? Re: Visual Basic .NET Standard vs. SQL Server 2000 Developer Edition Dave Kreskowiak13-Sep-05 12:32 Dave Kreskowiak 13-Sep-05 12:32  Frankly, I've never tried it. I think it would work, but it might take a couple of hacks to get it there. RageInTheMachine9532 "...a pungent, ghastly, stinky piece of cheese!" -- The Roaming Gnome Moving from Web Development to Windows Anonymous13-Sep-05 8:15 Anonymous 13-Sep-05 8:15  Hi, I have been working purely as a web developer for some time. My boss now wants me to create my next project as a windows application (VB.NET), which I have never done! My question is what sort of things should I be aware of? I will be using databases, are these treated differently? Thanks Re: Moving from Web Development to Windows Dave Kreskowiak13-Sep-05 8:46 Dave Kreskowiak 13-Sep-05 8:46  Anonymous wrote: I will be using databases, are these treated differently? Nope. Data is data. If your application is written correctly into tiers, then you could quite easily use the same business rules and data access classes between an ASP.NET version and a Windows Forms version of your app. There's not too much different from ASP.NET. It's still an event driven model. RageInTheMachine9532 "...a pungent, ghastly, stinky piece of cheese!" -- The Roaming Gnome Return the filename of an image in a picturebox smith342113-Sep-05 5:43 smith3421 13-Sep-05 5:43  I have a picturebox that has been populated with an image. I need to determine the path/filename of the image being displayed in the picurebox. Does anyone know of the property that contains the path and filename of an image displayed in a picturebox? Thanks Keith Re: Return the filename of an image in a picturebox Dave Kreskowiak13-Sep-05 5:58 Dave Kreskowiak 13-Sep-05 5:58  There is no way to determine this. Not all Images or Bitmaps are created from files, so it's of little use. Since you loaded the picture box from a file, you've already got the filename. It's just not attached to the Image object. I think your problem will be solved if you exposed your data, like the currently loaded filename, in the correct manner. RageInTheMachine9532 "...a pungent, ghastly, stinky piece of cheese!" -- The Roaming Gnome Finding my mummy Mark0613-Sep-05 1:27 Mark06 13-Sep-05 1:27  Please help me, I've lost my mummy. I am a class , which inherits a tabpage. I have a procedure in my tabpage class which needs to update other controls outside of my tabcontrol inwhich i sit. For example, my tabpage class is within a tabcontrol which is in a form that also has a statusbar. How can I find it? I tried doing: <br /> me.parentform.statusbar1.text = "Loading" But that doesnt quite work out. I tried doing: <br /> dim fmain as Mainform<br /> fmain = ctype(me.parentform,MainForm)<br /> <br /> fmain.statusbar1.text = "Loading" but that never worked out either. Is there another way? Re: Finding my mummy Dave Kreskowiak13-Sep-05 4:22 Dave Kreskowiak 13-Sep-05 4:22  A TabPage doesn't have a ParentForm property, unless your class provides it. It has a Parent property, which points to the container holding the TabPage. This should be the TabControl, not a Form. The TabPage should not care, or more precisely know, about any object that contains it. Really, what your TabPage should be doing is exposing an event that gives status text information. Then the Form can subscribe to that event and get notifications from your TabPage. This also makes it much easier to redirect status messages to other destinations, such as the event log or to a file. RageInTheMachine9532 "...a pungent, ghastly, stinky piece of cheese!" -- The Roaming Gnome Re: Finding my mummy Mark0613-Sep-05 5:58 Mark06 13-Sep-05 5:58  ahaa, I like your way of thinking Dave, I'm going to have to try that. However.... Your method destroys my application design because of this... In my tabpage, I also have a text box, which the user inputs a value into. This text box, once value has changed, then needs to update a textbox in another tabpage. Tabpage 1 is not aware of any existence of tabpage 2. Therefore how can I raise an event in tabpage 1, because tabpage 2 will never know? Your thoughts appreciated. Andy Re: Finding my mummy Dave Kreskowiak13-Sep-05 6:26 Dave Kreskowiak 13-Sep-05 6:26  You're following the shortcut of "visual elements must update other visual elements with new data". WRONG! Visual elements are responsible for updating their small part of a data store. Their sole function is life is to manage the input of data and store it somewhere. If that element is supposed to display data too, it should get it from that same data store, or class (hint, hint). In your example, a TextBox on TabPage1 has to update information in a TextBox on TabPage2. If each TabPage, or visual element should not know anything of visual elements outside their own Form, or TabPage, how is this data supposed to get back to the TextBox of TabPage2? Easy, create a storage class that holds all the information that these TabPages manage. When TabPage1 needs to make changes to TabPage2, it's the data that changes in the storage class. When TabPage2 is displayed, it's responsible for retrieving the current information from the storage class and populating its controls with the updated information. Each TabPage should know about it's little section of the storage class, nothing else. RageInTheMachine9532 "...a pungent, ghastly, stinky piece of cheese!" -- The Roaming Gnome Re: Finding my mummy Mark0613-Sep-05 10:42 Mark06 13-Sep-05 10:42  Thankyou for replying Dave. This is turning into a very interesting discussion. You are correct in your initial statement. I can see its a very bad way of programming, but also a very simple way of getting a job done quickly. Your right, creating a class to encapsulate the data would be perfect. But this is triggered by an event within tabpage2, ie: its own activation. Primarily because its hidden until the user clicks on its tab. What if the trigger occurred somewhere else? Lets imagine for a moment that they are not tabpages, but infact child windows, side by side, within an mdi form. The user fills in a value into a textbox in childwindow1. But childwindow2 is still visible on the screen, next to childwindow1. There's no event triggered within childwindow2, so therefore its textbox will not refresh with the new data. If each childwindow knew who its parent was, childwindow1 could raise an event and cause a cascading situation until childwindow2 got updated. But that could get very messy. Maybe a timer in childwindow2 to check the class for any changes? Again, horrible and messy. This still returns to my original question. If a child is not aware of any other siblings and their events, its only link is the parent? Look forward to your reply. Andy Re: Finding my mummy Beaniiman13-Sep-05 12:05 Beaniiman 13-Sep-05 12:05  Just add some events to that datastore class. Perhaps have it (the datastore class) raise events that each of your tabs can monitor. They must, afterall, be aware of the class that is holding the data. Why not make them aware of events in that class that tell anything that sets or retrieves data from it what is going on. That should work with your mdi form example also if I'm not mistaken. Beaniiman Re: Finding my mummy Dave Kreskowiak13-Sep-05 12:44 Dave Kreskowiak 13-Sep-05 12:44  andymknight wrote: but also a very simple way of getting a job done quickly. If it's not done right, it's not done. It's just hacked togther and "works". andymknight wrote: Your right, creating a class to encapsulate the data would be perfect. But this is triggered by an event within tabpage2, ie: its own activation. Primarily because its hidden until the user clicks on its tab. Yep. Remember, the user interface was not meant to store the data, just display it and process input. andymknight wrote: What if the trigger occurred somewhere else? Lets imagine for a moment that they are not tabpages, but infact child windows, side by side, within an mdi form. The user fills in a value into a textbox in childwindow1. But childwindow2 is still visible on the screen, next to childwindow1. That's a hacked example. An MDI interface was meant to have Multiple Documents using the same editor. Not have multiple pages open all modifying the same data. If you've got this situation, you really have to rethink your data model. andymknight wrote: The user fills in a value into a textbox in childwindow1. But childwindow2 is still visible on the screen, next to childwindow1. There's no event triggered within childwindow2, so therefore its textbox will not refresh with the new data. There will be if, like Beaniiman said, the data class raises events that say "such-and-such" changed! Ever look at the events of various controls? Same exact thing. If you change a property in a control, an event fires off, usually by the name PropertyChanged. andymknight wrote: If each childwindow knew who its parent was, childwindow1 could raise an event and cause a cascading situation until childwindow2 got updated. But that could get very messy. Maybe a timer in childwindow2 to check the class for any changes? Again, horrible and messy. Messy? That's why no-one worth their weight does this! andymknight wrote: This still returns to my original question. If a child is not aware of any other siblings and their events, its only link is the parent? Beaniiman beat me to it, but your data class can expose its fields as Properties. Then when TabPage1, or ChildForm1, changes anything in the dataclass, the Property code fires a PropertyChanged event. Any subscribers to the event, like TabPage2 or ChildForm2, get notified of the change and can update themselves with the new value. Notice, this still follows the model of various visual elements maintaining their own little part of the dataset. There is nothing that says a data class can't fire it's own events when a field in the data class changes. RageInTheMachine9532 "...a pungent, ghastly, stinky piece of cheese!" -- The Roaming Gnome Re: Finding my mummy Mark0613-Sep-05 13:17 Mark06 13-Sep-05 13:17  Well, what can I say? Thankyou Dave, and Beaniiman. In such a small thread, I've learnt alot about design techniques and how I should code differently. Thankyou for your input, its been extremely interesting. Andy VBNET, mysql and time field error ecentinela13-Sep-05 0:41 ecentinela 13-Sep-05 0:41  I have an sql query like "select id, text, time from table" filling a datagrid. i have a problem with the datagrid values in the time cell. It says that has null values or 00:00:00 value. I don't know why. If I make the same query directly in mysql, it returns correct values. I test the same query with a little variation "select id, text, HOUR(time) from table".This time, the datagrid shows the correct values (12, 06, etc). Someone knows why is happening this? Re: VBNET, mysql and time field error ecentinela13-Sep-05 1:50 ecentinela 13-Sep-05 1:50  Well, I solved the problem this workaround: "select id, text, DATE_FORMAT(time,'%H:%i:%S') from table" Hope this helps to somebody!

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