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You can call the native implementation, you just need to P/Invoking the signature. The following will allow you to call MessageBeep.
[DllImport("user32.dll")]
static extern bool MessageBeep(uint uType);
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A service can actually interact with the desktop because it can create a window station either one of two ways.- Run the service as SYSTEM and check the interactive option. This is highly discouraged, however, because a service rarely needs SYSTEM (like Administrative) privileges.
- Run the service as a user with interactive login rights. That user can still login interactively, but the service runs as that user. A separate window station (which hosts a desktop) is created for both.
You can read more about Windows Services - in general - at http://msdn.microsoft.com/library/en-us/dllproc/base/services.asp[^].
I am planning on releasing a new article about this hopefully this weekend if I get time to finish it up, so keep an eye on my articles if you'd like.
You could simply P/Invoke the native Beep API:
[DllImport("kernel32.dll", SetLastError=true)]
static extern bool Beep(
[MarshalAs(UnmanagedType.U4)] int dwFreq,
[MarshalAs(UnmanagedType.U4)] int dwDuration);
public void Beep()
{
if (!Beep(256, 500))
throw new Win32Exception();
}This is by far more simple.
This posting is provided "AS IS" with no warranties, and confers no rights.
Software Design Engineer
Developer Division Sustained Engineering
Microsoft
[My Articles] [My Blog]
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Damn! :-> Beat me to it! 
RageInTheMachine9532
"...a pungent, ghastly, stinky piece of cheese!" -- The Roaming Gnome
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Hello,
I'm trying to find a way to determine the size of the text in a LinkLabel. I want it to automatically resize itself. Other controls have a ContentsResized event, but the LinkLabel is sadly lacking. Any ideas? I was thinking that I could create a Graphics object from the control and call MeasureString to get the size of its text - when would be the best time to do this?
Will
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Handle it in the TextChanged event. You are on the right track with using the MeasureString graphics object.
Good luck
- DougW48
dwright@tdci.com
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That does make sense now that I've woken up a bit.
Thanks,
Will
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Hi all,
been looking for a solution the following:
I have images of some buildings. The images are in perspective, and i would like to transform them so that it is in orthomode: top width is same as bottom width
Building on the initial photo image [perspective]:
/--\
/ \
/ \
/---- ---\
Building transformed to correct proportions:
----------
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I've seen some people talk about Ransac but that needs 2 images from the same target so it can rectify based upon edge points.
I know the size of the building in meters. The corners are measured. Also i know the positions of the corners of the windows and doors.
Those points are 'picked' on the 'perspective image' also and the wish is to transform the perspective using the transformation parameters from the source- and target points into a new image.
Does anyone have an example, prefereably C#, or the theory behind this so i can reproduce the action?
Gdi 'only' has the option to rotate/move/skew but not something like the rectify i am looking for.
Hope someone can send me to the correct grid here  )
Jan.
PS. the procedure is a little like creating a panorama --> identical points on the images should result in a combined image.
In my case i need the one image to be transformed to the coordinate system of the points of the measured building.
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I want to know what are the classes that enable me
to controle by resource in C# like printer,flopy,cd room ,scanner,...
thanks.
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Your english does not make sense.
If you're asking what classes to use to control the cd rom, floppy, printer, scanner, there's a wide variety of possibilities: for file and folder browsing, look at the System.IO namespace. For printing, look at System.Drawing.Printing.
Tech, life, family, faith: Give me a visit.
Judah Himango
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Hi,
I want to know how to make the group headings appear in larger or bold type font.
Anyone know how to do this ?
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And what "group headings" would those be? You need to be specific if you expect any sort of decent help.
This posting is provided "AS IS" with no warranties, and confers no rights.
Software Design Engineer
Developer Division Sustained Engineering
Microsoft
[My Articles] [My Blog]
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The "group names" then ? When you form the list into groups I want the group names to appear in bold or larger font.
"group name"
-------------------------
Group Item 1
Group Item 2
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The ListView in .NET 2.0 will support this, but for now you should read the documentation[^] for List-View controls - the Windows Common Control that the ListView class encapsulates. You can also only do this on Windows XP because it requires you to bind to the Common Controls 6 library, which is a Win32 side-by-side (SxS) assembly only for XP and above.
To bind to CC6 in .NET 1.0, read my article[^]. For .NET 1.1, you can do the following for your entry point method:
static void Main()
{
Application.EnableVisualStyles();
Application.DoEvents();
Application.Run(new Form1());
}You then need to P/Invoke SendMessage and declare several structs, like the LVGROUP struct and LVITEM - as if _WIN32_IE were set to 0x560 or above (read the documentation I linked and you'll see what I mean) - in order to 1) define groups, and 2) put ListViewItems in a particular group. There's a lot to do, and knowledge about native Windows programming with the Common Controls is practically required.
For a decent article and sample code, see the article C# ListView 1.3[^] (a.k.a. "Glacial ListView").
For information on what's in the Whidbey (.NET 2.0) beta regarding this issue, see http://msdn2.microsoft.com/library/System.Windows.Forms.ListViewItem.Group[^].
This posting is provided "AS IS" with no warranties, and confers no rights.
Software Design Engineer
Developer Division Sustained Engineering
Microsoft
[My Articles] [My Blog]
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I believe you're going to have to P/Invoke in order for it to work. The ListView doesn't expose any way to deal with it.
--
Joel Lucsy
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I want to know what are the classes that enable me
to controle by resource in C# like printer,flopy,cd room ,scanner,...
thanks.
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You're going to have to be a little more specific than that. If by "controle" (actually, "control") you mean to print to a printer, then read the documentation[^] for the System.Drawing.Printing namespace classes. There's lots of examples in there was well.
To access a floppy you use one of the System.IO classes - like the FileStream - to open a file on, for example, your "A:\" drive just like you would any other file (that's what an operating system is supposed to provide - transparency). Same goes for a CD-ROM.
For a scanner you'll need to search[^] for something like "C# twain driver". There may be some articles on this site as well, but you'll again have to search using the text box at the top of every page underneath the logo. Research is part of development.
This posting is provided "AS IS" with no warranties, and confers no rights.
Software Design Engineer
Developer Division Sustained Engineering
Microsoft
[My Articles] [My Blog]
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Hi everyone,
I am using a view in SQL server as a filter in order to show only a subset of rows to the user (depending on specific rights noted in a separate table).
At the same time I make use of the SqlCommandBuilder because I do not need any specific control over the sql statements.
This works nicely as long as select rights are granted to the user to both the view AND the underlying table. If I switch off the select right on the table (which is why I am doing this in the first place) the CommandBuilder cant find the schema information necessary to build the commands.
Now: The necessary schema information is present in the program in the form of a dataset containing all the tables, PKs and FKs (it gets the information at design time, no need to access the DB at runtime).
Does anyone have an idea how I can convince the SqlDataAdapter or the SqlCommandBuilder to make use of this information rather than to retrieve it from the server?
Anything that would save me writing tons of dumb sql-statements would be greatly appreciated!
hajo
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SELECT privileges are still required on the table. A view is just a view on that table.
If you look at the documentation for the SqlCommandBuilder - or better yet look at the IL using ildasm.exe for the System.Data.dll assembly - you'll see that it only gets its schema information from the database. To do otherwise could pose a problem. While you may give correct schema information using a DataSet schema, someone else may not.
If the SqlCommandBuilder doesn't suit your needs, implement the other SqlCommand instances for the SqlDataAdapter yourself. It's not difficult.
This posting is provided "AS IS" with no warranties, and confers no rights.
Software Design Engineer
Developer Division Sustained Engineering
Microsoft
[My Articles] [My Blog]
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Heath Stewart wrote:
SELECT privileges are still required on the table. A view is just a view on that table.
In the general case, this is not true; shielding the underlying table from direct user interaction is one reason that views exist.
In the specific case of a commandbuilder, it might be true due to the way the commandbuilder queries metadata about the underlying table.
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Thanks a lot for the confirmation of what I thought I had found in the documentation (but was not sure I had found everything).
>While you may give correct schema information using a DataSet schema, >someone else may not.
That's true but since I do have the schema information it would be so much easier 
I could even provide it in XML-Schema form directly if only the SqlCommandBuilder would be ready to accept it!
>If the SqlCommandBuilder doesn't suit your needs, implement the other >SqlCommand instances for the SqlDataAdapter yourself. It's not difficult.
Now, the SqlCommandBuilder suits my needs perfectly especially in that I can chose to use optimistic concurrency if I want to. I will certainly attempt to write my own commandbuilder rather than writing tons of discrete sql statements if only for ease of future adjustments necessary with every change in the DB.
Could you perhaps point to any sort of sample code (or any source code publicly available)that would help to jump-start that piece of work? [I have seen some pieces of code on the web but I don't seem to be able to remember the place; had something to do with the ".Net-for-Linux" project]
Thanks anyway, even knowing for sure that a solution is not feasible helps a lot!
hajo
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Start by looking in the .NET Framework SDK[^] (which is also installed locally with VS.NET by default, along with the standalone .NET Framework SDK from http://msdn.microsoft.com/netframework[^]) to see what interfaces and/or abstract classes the SqlCommandBuilder implements or extends, respectively. Read about those interfaces and/or classes.
To see how the SqlCommandBuilder works, if you know how to read IL use ildasm.exe from the SDK or download .NET Reflector[^]. This will give you insight into how it works, which should help you figure out how to change it (or, rather, derive your own) to better suit your needs.
Another approach is to create a sample project and use the designer to design all your commands (which actually uses the command builders at design time), tweak the generated source code, and copy that into your current project.
This posting is provided "AS IS" with no warranties, and confers no rights.
Software Design Engineer
Developer Division Sustained Engineering
Microsoft
[My Articles] [My Blog]
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Thanks a lot, Heath!
That should be enough to get things started.
Hajo
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Hello,
I am really sorry for this stupid quesiton.But I am very new at .NET.
I have a solution that includes two windows applications.I would like to open the second application based on the first application.How can I do this?
I want to open a windows forms belongs to second windows application.
How can I establish a relationship between these two windows applications?
PLEASE HELP
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Not sure if you can just make a reference between 2 winforms projects (just tried and it won't let me).
What you could do is open and run the 2nd EXE using the Process object and perhaps pass in a command argument that will show the desired form instead of the main created in void Main().
Does this help?
Cheers,
Simon
sig ::
"Don't try to be like Jackie. There is only one Jackie.... Study computers instead.", Jackie Chan on career choices.
article :: animation mechanics in SVG blog:: brokenkeyboards
"Most of us are programmers, but a few use VB", Christian Graus
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