who can do a favor for me? - C# Discussion Boards

31-Mar-04 17:38

This is an incredibly difficult task because the TreeView is responsible for drawing the entire surface, not like pieces of it like a ListView. Like other controls, the TreeView encapsulates its common controls equivalent, namely the Tree-View. This class was not designed with owner drawing in mind.

Many attempts have been made to owner draw the tree, but none are very good at all. You're much better off using a third-party control like that from http://www.infragistics.com[^] (UltraWinTree). We use it for our products and it's very extensible with a drawing model that's easy to extend.

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MessageBox

DucLinh31-Mar-04 15:41

DucLinh

31-Mar-04 15:41

I want to know how to change the font, or size of MessageBox.
Help me please.
Thanks in advance.

Mr Duc Linh Nguyen

Re: MessageBox

Heath Stewart31-Mar-04 17:40

How to set splitter position

31-Mar-04 17:40

You can't, not without changing the system font. It encapsulates native calls, namely the MessageBox native API.

If you want a different look, create your own Form and make it work similarly if you like.

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yu-yu31-Mar-04 14:48

yu-yu

31-Mar-04 14:48

Hello,

Now I develop a dialog included splitter control.
After moving splitter control, I regist splitter location
in registry. In this case, I get location using splitter_moving event(SplitterEventArgs).
And I restart this dialog.
I set location. The following is setting code.
this.splitter1.Location = new Point(x,y);

But I couldn't.

I think this solution is no problem.
If you have some ideas, please tell me.

regards,

yu-yu

Re: How to set splitter position

Heath Stewart31-Mar-04 17:45

Re: How to set splitter position

31-Mar-04 17:45

Don't waste resources saving the position every time it moves, but rather before the control is disposes (like when the container form is closed, which is also the best time to save any other positions and sizes you want). Some applications will save this data AFTER a change to make sure it is saved in cash of a crash, but don't do it while it's moving. You could, for instance, do this in the handler for the SplitterMoved event. See the documentation for the Splitter class in the .NET Framework SDK for more information.

The property you're looking for is Splitter.SplitPosition, as documented in the .NET Framework SDK. This is the distance (in pixels) between the location of the splitter and the side it's docked to (so if Splitter.Dock is set to DockStyle.Left (default), then SplitPosition set to 100 means it's 100 pixels from the left border of its container).

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yu-yu1-Apr-04 19:08

yu-yu

1-Apr-04 19:08

Hello,

Thank you for your advice.
I tried to do, but I couldn't do using splitterMoved event (always position is zero).
I used SpliiterMoving event, so I get position of splitter (SplitX, SplitY).
And I set Y position to Splitter.SplitPosition.
But time to do is long.

I checked MSDN and etc.

regards,
yu-yu

who can do a favor for me?

liu123jian12331-Mar-04 13:44

liu123jian123

31-Mar-04 13:44

I have a table,it includes three columns :
studentID, name, score. There are a few records in the tale. The data in the table will be transferred across network. Now I want to write a class to packs these data into a packet in the client end,and unpack the packet in the server end.How to do it?
Confused | :confused:

Thank you!

Re: who can do a favor for me?

Colin Angus Mackay31-Mar-04 21:14

Colin Angus Mackay

31-Mar-04 21:14

liu123jian123 wrote:
I want to write a class to packs these data into a packet in the client end,and unpack the packet in the server end

Using what technology? Or does it not matter?

"You can have everything in life you want if you will just help enough other people get what they want." --Zig Ziglar

"On two occasions, I have been asked [by members of Parliament], 'Pray, Mr. Babbage, if you put into the machine wrong figures, will the right answers come out?' I am not able to rightly apprehend the kind of confusion of ideas that could provoke such a question."
--Charles Babbage (1791-1871)

References and asambling?

Snowjim31-Mar-04 11:46

Snowjim

31-Mar-04 11:46

Hey

We are working on a smal game project.

In this project ve are al doing Windows Control Librarys, for example. The List that shows al online clients is one Windows Control Library and the chat window is one Windows Control Library and so on.

This Windows Control Librarys is including other dll files that is updated over time. One of this dll files is caled Transfer.dll, almost every Windows Control Library includes this file, but somtimes thay got a older version.

The dll files that our Windows Control Librarys uses is lokated at one place (/bin/debug), and this is for al the Windows Control Librarys. so when we adds this Windows Control Librarys to the main projekt form we only whant to have one dll file of each in /bin/debug.

There is some problem with this.

Exempel one
I have hade many versions of one dll file, say Transfer.dll on my computer. A friend that works on this project also have placed together the controls in one project, and got it to work on his computer.

But...
When he have sent me the projekt i look in the catlog (/bin/debug) and se that the versions of the dll files is the new ones. When i then start up the project o get some warnings about dependency, and i notic that some of the dll files is now an older version then before i open the project in Visual Studio.net at my computer.

How could this be? i cant compile it, and i got alot of errors.

I have lookt at msdn but i dont realy understand what thay are talking about, its som Asambling i shold copy to the bin directory..

I have taken the Asembliinfo in the main projekt och copy it to the bin/debug directory, but this dident solve the problem.

Pleas can somone help us understand this as easy as posible, and how to solve the problem?

We whant al the Windows Control Librarys to share the same dll files that lays in bin/debug, and even if we update some of this dll files the Windows Control Librarys will be abled to open them(if the funktions thay use is still in there)

//Jimmy

Re: References and asambling?

Heath Stewart31-Mar-04 14:33

Re: References and asambling?

31-Mar-04 14:33

First, you should use project references instead of assembly references when you have multiple projects in a solution. This ensures that dependencies are created and that the right versions of assemblies are used.

Second, don't use a version number like 1.0.*, the default for the AssemblyVersionAttribute. In larger development projects, this will burn you fast.

Finally, see the <assemblyBinding> section in the .NET Framework SDK - which you can use to redirect versions, as well as publisher policy assemblies - as well as How the Runtime Locates Assemblies[^]. This allows you to redirect assembly version and to know where exactly to put the assemblies, such as in the same directory together, in the GAC, use a custom private path (ex: ASP.NET uses "bin" as its private path), or using the <assemblyBinding> section to specify the codebase for assemblies you want to use no matter where they are.

You should also consider keeping a build directory when you have projects that don't reference other projects, such as a plugin-driven application. With VS.NET, you can do this easily using post-build actions in the project configuration. There's also the DEVPATH environment variable that's documented in the .NET Framework SDK that can be helpful as well. It pretty much works like the PATH environment variable used to locate executables (.exes, .dlls, .bats, etc.).

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Snowjim31-Mar-04 22:17

Snowjim

31-Mar-04 22:17

Hey thanks!

We have lookt throw the MSDN on this topic, but cant realy find what to do.

We dont understand what Asembling file is for? we think it haveing the information about what dll version is used and where to find it. But we cant find a file in our project that have this information.

We have added dll files to our Windows control Libararys this way.
move the dll file to /bin/debug
rightclick on the referens and added the dll file to the project. This works fine and we can worke against the dll file with no problem.

But when we then add all Windows control Librarys to the main project we get some dll varnings, and as a said the versions on some dll files is changed to older versions.

Pleas could you maby do a stepBYstep on this?

//Jimmy

Re: References and asambling?

Heath Stewart1-Apr-04 4:03

1-Apr-04 4:03

I already told you how to solve this: use project references, not assembly references, and do NOT use automatic versioning because you easily loose track of what versions of assemblies you're binding to.

If you don't know what an assembly is, you should pick up a book or two on .NET development. It's a basic unit of a .NET application. It contains the code in modules (which are more like native DLLs), resources, assembly attributes, and a manifest that lists them all.

When you compile an assembly, the versions of dependent assemblies are compiled into the assembly, so if you compile against version 1.0.0.0 of an assembly, then that version of the assembly has to be found, otherwise you have to use the <assemblyBinding> section of your app.config file, or use a publisher policy assembly, both of which can redirect the versions. This is meant primarily for upgrading applications without having to upgrade every existing assembly.

Also, don't add references to the bin/debug or bin/release directorys. Use project references primarily. If you're using a third-party control, it should install on the local filesystem and into the GAC. Don't change this. References are copied to the project target directory (bin/debug, bin/release, etc.) when you compile (by default, those in the GAC do not). That's why you don't include your dependent assemblies in the target directories. If you use project referneces like I've mentioned several times now, build dependencies are setup and the assemblies are copied to the target directory keeping the versions in sync.

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Tape Drive access

Shaun Becker31-Mar-04 9:38

Shaun Becker

31-Mar-04 9:38

Is it possible to read, write, and perform drive maintenance(cleaning, inventory, etc.) on a tape drive from C#? Thanks alot

Re: Tape Drive access

Heath Stewart31-Mar-04 9:53

Endless Mouse Move Events

31-Mar-04 9:53

Is it possible? Sure. Would anyone sane want to do it? Absolutely not. Tape drive access is a very low-level, huge set of operations. You'll need to P/Invoke so many functions and declare so many structs and consts/enums that you'll probably never get to the meat of the development, unless you can find some COM control to interop or a wrapper DLL that you can P/Invoke, but you probably won't since this is not something that consumers typically "play with". The software you use with your drive (Veritas Backup, et. al.) may have some undocumented APIs you could P/Invoke, but as they're most likely undocumented for a reason you'll have a REALLY tough time.

See the Windows DDK (driver development kit) for details. It's huge and it's ugly.

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Darryl Borden31-Mar-04 9:24

Darryl Borden

31-Mar-04 9:24

I have an object of type UserControl that I occasionally have problems with.

Normally, when I move the mouse over the object, windows will generate a mouse move event as advertized - only when the mouse moves.

Occasionally, however, windows goes crazy on me and generates a gazillion mouse move events for as long as the mouse is over the object and it is not even moving. I get so many of these events that it inhibits the application from performing until I move the mouse off the object.

Has anyone seen this type of behavior before and, if so, was there anything you could do about it?

Darryl Borden
Principal IT Analyst
darryl.borden@elpaso.com

Re: Endless Mouse Move Events

leppie31-Mar-04 9:49

leppie

31-Mar-04 9:49

You are probably doing a wrong invalidate during the event handling, I have seen the same behaviour on the PropertyGrids TypeConvertors.

^{top secret}

Re: Endless Mouse Move Events

Bryan White31-Mar-04 10:32

Bryan White

31-Mar-04 10:32

Yup - I've experienced it. It was an OpenGL control with mouse interaction, and didn't bother to work out WHY it happened - I just stopped it being a pain with following pseudocode:

PointOrWhatever savedPosition;
void HandleMouseEvent(whatever args)
{
if(args.position == savedPosition)
return;
DoMyMouseMovingStuff();
savedPosition = args.position;
}

Regards

Brewman

CreateProcess call....

RB@Emphasys31-Mar-04 8:27

31-Mar-04 8:27

I'm wondering if the codeproject guru's might have an answer to my little riddle. I have plenty of code to call the createprocess function of the coredll.Dll assembly. Here is my quandry, all of those api declerations along with the actual call itself use a part of the framework that is not included with the compact framework. For instance I know you can use the Process class to create process's, but not with the cf. I have some code that defines the function but defines various parameters through the System.Web namespace, also not included with the cf. Ill post my decleration, any help would be appreciated.

[DllImport("CoreDll.DLL", SetLastError=true)]
private extern static int CreateProcess(String imageName, String cmdLine, IntPtr lpProcessAttributes, IntPtr lpThreadAttributes,Int32 bool InheritHandles, Int32 dwCreationFlags,IntPtr lpEnvironment,
IntPtr lpszCurrentDir,byte [] si, ProcessInfo pi );

Thanks again,
Ryan

Heath Stewart31-Mar-04 8:57

31-Mar-04 8:57

Sorry, but I'm not really seeing a relevent problem statement there. Are you saying your P/Invoke declaration isn't working? And what do you mean you're defining various parameters through the System.Web namespace?

Your declaration look okay to me. You might want to add CharSet=CharSet.Unicode to your DllImportAttribute to be sure that strings are marshalled appropriately.

If you don't like calling this often from your code, encapsulate it in a public static method or something.

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RB@Emphasys31-Mar-04 9:07

31-Mar-04 9:07

I apoligize for not being more clear. I can't use the statement because the ProcessInfo class which is the last argument is part of the System.Web namespace which isnt included in the cf. I was curious if anyone knew of another way of declaring the function without using the ProcessInfo class for the last argument.

Thanks,
Ryan

Heath Stewart31-Mar-04 9:12

31-Mar-04 9:12

Just call the parameter as something else. The fact is that you have to define that struct that the P/Invoke statement takes. You could call it Asdf and it won't matter, so long as the struct matches the structure defined in Windows. If you like the name ProcessInfo, then define it yourself and just qualify it with the namespace you define it under.

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RB@Emphasys31-Mar-04 9:14

31-Mar-04 9:14

Thanks Heath

RB@Emphasys31-Mar-04 9:48