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Simon Stevens wrote: A Car is-a vehicle and a car also is-a ManMadeItem, but this forms a hierarchy (Car->Vehicle-ManMadeItem) so multiple inheritance isn't needed
I don't think I'd regard that as a hierarchy, because a horse could also be regarded as a Vehicle even though it is not a ManMadeItem.
I think the simplest way to look at the issues of inheritance versus interface is that an inherited base class can supply default fields and methods which are then usable by child classes; an interface not only does not provide default storage for fields and code for methods, but it can't even bind them by default. If an object inherited from Class1 and Class2, both of which provided a Smile method, it would be unclear whether TheObject.Smile was supposed invoke Class1.Smile or Class2.Smile. With interfaces, however, there is no problem. TheObject must have an "implements" line for every interface method it supports, indicating what method should be used for Interface1.Smile and which one should be used for Interface2.Smile. Further, to actually use either of those methods on an object, the object must first be cast to Interface1 or Interface2. Thus, there is no ambiguity.
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Because interface doesn't contain any definitions to any declarations but abstract class does.
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waqarnaeem2@hotmail.com wrote: why Interface supports multiple inheritance ?
It doesn't. Interfaces define an implementation contract. You don't inherit anything from an interface, it just forces you to implement the interface.
Man who stand on hill with mouth open wait long time for roast duck to drop in
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Hi,
I'm really hoping for an easy answer to this issue. I have a client device that uses a hardwired connection to communicate with its server if it is in a docking station. If lifted from the docking station the hardwired connection is disabled and it switches to its wireless connection. This is where remoting stops working on the serverside.
The client device has 2 network cards with different IPs, one for the hardwired connection and one for the wireless connection. When switching to wireless/hardwired the client is still able to send messages to the server, but apparently the server is still trying to reach the client on the connection it initially used so the return messages fail.
How is this fixed? Where is this fixed? I've tried to call RemotingServices.Configure again but it seems you can only call that once. Unregistering and re-Registering channels doesn't seem to work either. Any ideas would be greatly appreciated! Solutions even more!
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I have a Winforms project in which I am trying to Publish. I get the problem that says "keyset does not exist". I have no idea what to do. Any ideas?
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Something to do with assembly signing I would guess, since that uses cryptographic keysets.
What are your assembly signing settings?
Mark
Mark Salsbery
Microsoft MVP - Visual C++
![Java | [Coffee]](https://codeproject.freetls.fastly.net/script/Forums/Images/coffee.gif)
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I seemed to have fixed the problem (not sure how I did it, and I hope I can do it again in the future!) But I have another problem. When I run the setup app, I get the Application Install dialog, and it gives the name. I would like to change this name since somehow the name has a date associated with it (and the date has since changed.) I did a search throughout the whole project for the date, and could nto find it. Perhaps it is in the registry somehow?
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I'm just guessing again, but what about the Options dialog on the Publish page of the project's properties?
If you set the name(s) there instead of using the defaults does that fix anything?
Mark Salsbery
Microsoft MVP - Visual C++
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Mark, your suggestion worked. The product name was right there!
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Cool! Lucky guess 
Thanks for the update!
Mark Salsbery
Microsoft MVP - Visual C++
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Hi All,
I've spent the last couple of hours looking into a pretty big topic and I don't really feel like I've made any progress on the topic. I'm getting emails from potential users of my application concerned/worried/annoyed about the fact that my app may require a massive download for offline installation (a common scenario for my users).
My app targets XP SP2+ users on 32/64 bit OSes. My app is a .NET 3.5 SP1 based WPF product.
My installer already checks for 3.5 SP1 and contains the dotnetfx35setup.exe that will only download the required bits if the required framework version isn't installed. So for online users the problem isn't massive. However, I would like to make a single self-sufficient install .exe file that can take care of all users rather than pointing offline users to a 200mb+ installer on the Microsoft site.
I've been looking through the myriad files that make up the main dotnetfx35.exe and from what I can gather there isn't actually much I can strip out. Has anyone got any links of info on what can be done?
Scott Hansleman has some blog posts and this is pretty cool http://windowsclient.net/wpf/wpf35/wpf-35sp1-client-profile-deployment-photosuru.aspx[^] but I'm still none the wiser as to what I can actually get away with stripping out.
Considering that I'm including XP/Vista and 32/64 bit I still need to carry .NET2.0 / .NET3.0 / .NET3.5 stuff which is arguably nearly all of it!! Feels like I'm stuck with the massive download situation ...
Not to mention the worry of trashing a users .NET install altogether. Any info or pointers would be really appreciated.
Cheers,
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I've not played with the Client Profile, so I can't give any pointers there, but I do have another potential option for you. If your users have a worry on this, you could create two types of installs. One that has links to the redistributables, and the other that is merged together using ILMerge[^]. The ILMerge version would be a lot bigger than the other version, but it won't contain the whole framework, only the bits you need.
"WPF has many lovers. It's a veritable porn star!" - Josh Smith As Braveheart once said, "You can take our freedom but you'll never take our Hobnobs!" - Martin Hughes.
My blog | My articles | MoXAML PowerToys | Onyx
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Whoa, I'd forgotten about that util. Would it be safe to actually merge the system.dll / presentationcore.dll etc ... ?
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I've never really tried. Theoretically, you should be OK, but it would be worth experimenting.
"WPF has many lovers. It's a veritable porn star!" - Josh Smith As Braveheart once said, "You can take our freedom but you'll never take our Hobnobs!" - Martin Hughes.
My blog | My articles | MoXAML PowerToys | Onyx
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Gotcha. Will have a read around the subject and see what pops out!
Thanks Chap.
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Hi,
I'm trying to write application where I use series of PNG files for animations. I created control which loads Images from file into ArrayList, and then on specified timer interval I change picture that I want to display. I'm using 1280x720 PNGs.
I have 2 problems here:
1) My PNG is around 300KB, and when I execute Image.FromFile("my.png") memory of my process is increased for 4MB. So, if I load 30 pictures, memory will grow to around 130MBs and the problem is that I have to keep lot of images loaded into memory since I'm using it constantly during execution time.
2) performances of DrawImage functions are quite bad and I cannot get proper speed (if I need 25 frames per second for example)
Does anyone have some suggestions how to solve this?
Thnx in advance!
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Firstly, PNGs aren't really the best way to do animations. You should maybe think about using GIF images instead.
ddavor wrote: 1) My PNG is around 300KB, and when I execute Image.FromFile("my.png") memory of my process is increased for 4MB. So, if I load 30 pictures, memory will grow to around 130MBs and the problem is that I have to keep lot of images loaded into memory since I'm using it constantly during execution time.
I suspect (although I haven't tried it) that the 4MB jump is mainly a one-off overhead, and you won't get that increase on subsequent image loads. Try it and check though.
ddavor wrote: 2) performances of DrawImage functions are quite bad and I cannot get proper speed (if I need 25 frames per second for example)
You're drawing a 300KB 1280 x 720 PNG image, so I'm not surprised it's a bit slow...
An animated GIF will automatically play when loaded (although if you keep to that size it may still be a bit slow - again you'd need to test it) and if you can reduce the quality a bit you can probably reduce the file size to something more reasonable.
Alternatively, combine the images into an AVI and use a simple AVI player to show the animation.
There are three kinds of people in the world - those who can count and those who can't...
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Hi,
Thnx for your reply, but I need high quality of graphics with transparency etc. So, GIF and Avi are not solutions.
Thnx!
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Well, GIF images do support transparency, although it's just on/off rather than an alpha value, so you could possibly use that format depending on your use of transparency. GIF also isn't as good for "photo-style" images, where there are a lot of colour gradients, but it works well for images where there are a lot of colour bocks, lines etc. (In fact, for diagrams with lots of colour blocks and sharp edges, it gives much better results.)
AVIs can be as high quality as you want as well. You can choose the resolution and whether you want any compression applied. AVIs can have transparency as well, but you'd need to make sure you support that in your player.
I wouldn't write of GIF or AVI immediately, as they might, with a little bit of fiddling, be suitable for your needs. If not, I'm not sure what you can do to improve frame rate...
There are three kinds of people in the world - those who can count and those who can't...
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AVI could do the quality, however the transparency could be a problem. 1280x720 is a LOT of real estate to cover, if the entire area isn't being animated at the same time, you might be better off only redrawing the parts of the screen that change. Or moving a picture around the screen as the animation.
Aside from that, your next step would probably be using managed DirectX to pile all those graphics into buffers.
The true man wants two things: danger and play. For that reason he wants woman, as the most dangerous plaything.
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ddavor wrote: I execute Image.FromFile("my.png")
This response is nothing to do with your main problem, but Image.FromFile has been known to cause problems with files becoming locked. The general recommendation is to use Image.FromStream.
Henry Minute
Do not read medical books! You could die of a misprint. - Mark Twain
Girl: (staring) "Why do you need an icy cucumber?"
“I want to report a fraud. The government is lying to us all.”
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I am having an issue on a photo gallery that is random. I add a photo and it is supposed to save the location in an Access DB backend. It then has a thumbnail view for the photo. At random I get a red X instead of a thumbnail and get an error...its COMPLETELY RANDOM...if I clear the photo from that thumbnail and re-add it...it adds the photo, but continues to give me red X's and I have to clear and re-add...
See the end of this message for details on invoking
just-in-time (JIT) debugging instead of this dialog box.
************** Exception Text **************
System.ArgumentException: Parameter is not valid.
at System.Drawing.Image.get_FrameDimensionsList()
at System.Drawing.ImageAnimator.CanAnimate(Image image)
at System.Drawing.ImageAnimator.ImageInfo..ctor(Image image)
at System.Drawing.ImageAnimator.Animate(Image image, EventHandler onFrameChangedHandler)
at System.Windows.Forms.PictureBox.Animate(Boolean animate)
at System.Windows.Forms.PictureBox.Animate()
at System.Windows.Forms.PictureBox.InstallNewImage(Image value, ImageInstallationType installationType)
at System.Windows.Forms.PictureBox.LoadCompletedDelegate(Object arg)
************** Loaded Assemblies **************
mscorlib
Assembly Version: 2.0.0.0
Win32 Version: 2.0.50727.3082 (QFE.050727-3000)
CodeBase: file:///c:/WINDOWS/Microsoft.NET/Framework/v2.0.50727/mscorlib.dll
----------------------------------------
Program
Assembly Version: 1.0.4.15
Win32 Version: 1.0.4.15
CodeBase: file:///C:/Program%20Files/Program/Program.exe
----------------------------------------
System.Windows.Forms
Assembly Version: 2.0.0.0
Win32 Version: 2.0.50727.3053 (netfxsp.050727-3000)
CodeBase: file:///C:/WINDOWS/assembly/GAC_MSIL/System.Windows.Forms/2.0.0.0__b77a5c561934e089/System.Windows.Forms.dll
----------------------------------------
System
Assembly Version: 2.0.0.0
Win32 Version: 2.0.50727.3053 (netfxsp.050727-3000)
CodeBase: file:///C:/WINDOWS/assembly/GAC_MSIL/System/2.0.0.0__b77a5c561934e089/System.dll
----------------------------------------
System.Drawing
Assembly Version: 2.0.0.0
Win32 Version: 2.0.50727.3053 (netfxsp.050727-3000)
CodeBase: file:///C:/WINDOWS/assembly/GAC_MSIL/System.Drawing/2.0.0.0__b03f5f7f11d50a3a/System.Drawing.dll
----------------------------------------
NHibernate
Assembly Version: 2.0.1.4000
Win32 Version: 2.0.1.4000
CodeBase: file:///C:/Program%20Files/Program/NHibernate.DLL
----------------------------------------
log4net
Assembly Version: 1.2.10.0
Win32 Version: 1.2.10.0
CodeBase: file:///C:/WINDOWS/assembly/GAC_MSIL/log4net/1.2.10.0__1b44e1d426115821/log4net.dll
----------------------------------------
System.Configuration
Assembly Version: 2.0.0.0
Win32 Version: 2.0.50727.3053 (netfxsp.050727-3000)
CodeBase: file:///C:/WINDOWS/assembly/GAC_MSIL/System.Configuration/2.0.0.0__b03f5f7f11d50a3a/System.Configuration.dll
----------------------------------------
System.Xml
Assembly Version: 2.0.0.0
Win32 Version: 2.0.50727.3082 (QFE.050727-3000)
CodeBase: file:///C:/WINDOWS/assembly/GAC_MSIL/System.Xml/2.0.0.0__b77a5c561934e089/System.Xml.dll
----------------------------------------
Iesi.Collections
Assembly Version: 1.0.0.3
Win32 Version: 2.0.1.4000
CodeBase: file:///C:/Program%20Files/Program/Iesi.Collections.DLL
----------------------------------------
NHibernate.JetDriver
Assembly Version: 2.0.0.2001
Win32 Version: 2.0.0.2001
CodeBase: file:///C:/Program%20Files/Program/NHibernate.JetDriver.DLL
----------------------------------------
System.Data
Assembly Version: 2.0.0.0
Win32 Version: 2.0.50727.3053 (netfxsp.050727-3000)
CodeBase: file:///C:/WINDOWS/assembly/GAC_32/System.Data/2.0.0.0__b77a5c561934e089/System.Data.dll
----------------------------------------
gl5flowv
Assembly Version: 2.0.1.4000
Win32 Version: 2.0.50727.3053 (netfxsp.050727-3000)
CodeBase: file:///C:/WINDOWS/assembly/GAC_MSIL/System/2.0.0.0__b77a5c561934e089/System.dll
----------------------------------------
cnoliknr
Assembly Version: 2.0.1.4000
Win32 Version: 2.0.50727.3053 (netfxsp.050727-3000)
CodeBase: file:///C:/WINDOWS/assembly/GAC_MSIL/System/2.0.0.0__b77a5c561934e089/System.dll
----------------------------------------
System.Transactions
Assembly Version: 2.0.0.0
Win32 Version: 2.0.50727.3053 (netfxsp.050727-3000)
CodeBase: file:///C:/WINDOWS/assembly/GAC_32/System.Transactions/2.0.0.0__b77a5c561934e089/System.Transactions.dll
----------------------------------------
System.EnterpriseServices
Assembly Version: 2.0.0.0
Win32 Version: 2.0.50727.3053 (netfxsp.050727-3000)
CodeBase: file:///C:/WINDOWS/assembly/GAC_32/System.EnterpriseServices/2.0.0.0__b03f5f7f11d50a3a/System.EnterpriseServices.dll
----------------------------------------
************** JIT Debugging **************
To enable just-in-time (JIT) debugging, the .config file for this
application or computer (machine.config) must have the
jitDebugging value set in the system.windows.forms section.
The application must also be compiled with debugging
enabled.
For example:
<configuration>
<system.windows.forms jitDebugging="true" />
</configuration>
When JIT debugging is enabled, any unhandled exception
will be sent to the JIT debugger registered on the computer
rather than be handled by this dialog box.
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Well my guess is that there is a problem loading the image from the database. Can you give more information and show the code you are using to load the picture from the database and loading from new.
Life goes very fast. Tomorrow, today is already yesterday.
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The image loading is done by a "pictureBox.ImageLocation=" statement. It happens sometimes when loading and adding photos using right click. If you need some code can I email it to you.
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put the code on here.
the thing with picture boxes is when you load them directly from a file they can cause problems with access to the files. When loading picture boxes it best to load it from a memory stream, something like this...
PictureBox1.Image = Image.FromStream(new MemoryStream("imagefile"));
Life goes very fast. Tomorrow, today is already yesterday.
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