C# Discussion Boards - CodeProject

CherezZaboro18-Dec-04 7:51

18-Dec-04 7:51

I mean I have a class in C++ in a DLL with exported functions and of course constructor and destructor.
Can I link to this class from C# somehow? I just found a way to link global C functions.
What about C++ classes and methods?

Re: Can I call a C++ dll from C#?...

Judah Gabriel Himango18-Dec-04 15:12

Judah Gabriel Himango

18-Dec-04 15:12

Yes, search codeproject, msdn, or google for P/Invoke, aka platform invocation services. It allows managed code to call into unmanaged exported functions. While this was created primarily for calling into the Win32 API, it can be used on any C/C++ dll. Also have a look at P/Invoke.net.

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Re: Can I call a C++ dll from C#?...

CherezZaboro24-Dec-04 6:31

CherezZaboro

24-Dec-04 6:31

Yeah. I found that before. But my question is how to call exported classes? Of methods of classes - not just global exported C/C++ functions.

conversion and porting

bouli18-Dec-04 7:41

bouli

18-Dec-04 7:41

Hi gurus,

I have two questions for you guys,

I would like to know how I can convert the contents of a string to a byte[] array?

Also, what is the equivalent of the >>> java operator in C#?

Thanks Smile | :)

Best regards.

There is no spoon.

Re: conversion and porting

Alex Korchemniy18-Dec-04 14:52

Alex Korchemniy

18-Dec-04 14:52

String conversion: http://msdn.microsoft.com/library/default.asp?url=/library/en-us/cpref/html/frlrfsystemtextencodingclasstopic.asp[^]

Operators: msdn.microsoft.com/library/en-us/csref/html/vclrfCSharpOperators.asp[^]

This posting is provided "AS IS" with no warranties, and confers no rights.

Alex Korchemniy

Remote Desktop

Craigjw18-Dec-04 4:37

Craigjw

18-Dec-04 4:37

I'm writting some remote admin software in C#, I would like to be able to implement a remote desktop, much like what MS does with the windows terminal services, however, i'm too poor to pay for this, and hence want to write my own. Unfortunately, I'm not too sure where to start.

I'm intend implementing the solution on Win2k/WinXp. I have VNC connections to the destination networks, however, an HTTP connection solution would be optimally desired.

I currently can see one option available to me and it's not the optimum way. To use a screen grabbing process and download compressed images and mouse coords of the remote machines desktop to the server software, while coordinating keyboard/mouse input between the server & client software.

Using this method, a screen grab of 256 colours, 1024x768 resolution, zip compressed, the file size of the image is about 40-90 KB. With the bandwidth available to me, which is about a 500 Kb/s (62 KB/s) cable connection, the results are going to be slow frame rate of about 1-2 frame/s, which is not really acceptable.

If anyone can give me any pointers to source code or methods to implement a better way, it would be most helpful.

Re: Remote Desktop

Christian Pedersen18-Dec-04 7:41

Christian Pedersen

18-Dec-04 7:41

Take a look at the RealVNC protocol specification, that should give you some ideas.

http://www.realvnc.com/docs/rfbproto.pdf

Re: Remote Desktop

Craigjw18-Dec-04 9:25

Craigjw

18-Dec-04 9:25

Thanks for that, i'll have a read Smile | :)

WinForms: Doing something AFTER a Form is displayed for the first time?

Uwe Keim18-Dec-04 3:48

Uwe Keim

18-Dec-04 3:48

The Load event of a Form lets you write code before/after the form is loaded (don't know for sure). The doc says "Occurs before a form is displayed for the first time.".

Question: Is there a way to do something after a form is displayed for the first time?

I want to do some lengthy processing and it would be cool to have the form visible before displaying a wait-window or a wait cursor. I already tried to handle the WM_SHOWWINDOW message, but unsuccessfully.

Maybe I could post myself a message with PostMessage (if it is available)?

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Re: WinForms: Doing something AFTER a Form is displayed for the first time?

leppie18-Dec-04 5:41

leppie

18-Dec-04 5:41

This what i normally do:

protected override void OnLoad(EventArgs e)
{
  base.OnLoad(e);
  // do stuff now, or just fire of stuff to ThreadPool
}

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Re: WinForms: Doing something AFTER a Form is displayed for the first time?

Uwe Keim18-Dec-04 5:54

Uwe Keim

18-Dec-04 5:54

Thanks for your feedback! Unfortunately it has the same effect es handling the Load event in my current scenario. (I.e. the result that the dialog is not shown before finishing my lengthy processing).

I'll keep searching...

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Re: WinForms: Doing something AFTER a Form is displayed for the first time?

leppie18-Dec-04 7:13

leppie

18-Dec-04 7:13

Start the task via the ThreadPool then :p anything lengthy should enjoy its own thread anyways Smile | :)

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Download xacc-ide 0.0.3 now!
See some screenshots}

Re: WinForms: Doing something AFTER a Form is displayed for the first time?

Carl Mercier18-Dec-04 11:11

Carl Mercier

18-Dec-04 11:11

Use activate and set a variable to true. It:

.... ACTIVATE ....
if (!_tastDone) { DoSomething(); _taskDone = true; }

Re: WinForms: Doing something AFTER a Form is displayed for the first time?

benjymous19-Dec-04 22:53

benjymous

19-Dec-04 22:53

How about having a timer on your form that fires a fraction of a second after the form is opened?

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Re: WinForms: Doing something AFTER a Form is displayed for the first time?

Uwe Keim19-Dec-04 23:11

Uwe Keim

19-Dec-04 23:11

Yes, of course, but T I M E R, uaaah, evil Laugh | :laugh:

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Outlining Code

sssa200017-Dec-04 22:04

sssa2000

17-Dec-04 22:04

i am want to make a CodeEditor, so i want use the outlining code, but i do not know how to do, can anyone help me? thank you very much!

outlining code

sssa200017-Dec-04 21:55

sssa2000

17-Dec-04 21:55

i am very curious about the Outlining Code , and i want to carry it out in my progrm with c#, can you help me? thanks!

texttocolumns in Excel using C#

Anonymous17-Dec-04 18:39

Anonymous

17-Dec-04 18:39

I am trying to automate MSExcel and have so far been unsuccessfull converting text to columns. Does anyone have an example using the excel texttocolumns method?

Thanks

Re: texttocolumns in Excel using C#

Alex Korchemniy17-Dec-04 19:27

Alex Korchemniy

17-Dec-04 19:27

One of the best pieces of advice... use the macro recorder ! Poke tongue | ;-P

Open the editor and its crystal clear how you can work with the object model to do C# code!

This posting is provided "AS IS" with no warranties, and confers no rights.

Alex Korchemniy

Re: texttocolumns in Excel using C#

Anonymous18-Dec-04 5:34

Anonymous

18-Dec-04 5:34

This is how I have gotten through most if the issues I have encountered, but I have been unable to convert the VBS to C# when it comes to converting text to columns

Thanks

Not sure what to call it... virtual file possible?

Matt Philmon17-Dec-04 12:10

Matt Philmon

17-Dec-04 12:10

I'm interfacing with the iTunes SDK and need to grab the "artwork". Writing these files to disk is quite easy as the SDK provides a method SaveArtworkToFile(string path) to write the file out to disk. I currently then turn around and read the image back in for use.

I'd really like to get around having to write out the file. Is there some way to "trick" the SDK into thinking it's writing the file to disk but instead write it to some kind of memory stream? Keep it mind that this is the only call made available to get the artwork and that it only accepts the path for writing out the file.

That's why I called it a "virtual file".

Re: Not sure what to call it... virtual file possible?

Dave Kreskowiak17-Dec-04 14:09

Dave Kreskowiak

17-Dec-04 14:09

Matt Philmon wrote:
Keep it mind that this is the only call made available to get the artwork and that it only accepts the path for writing out the file.

Then it that case, no there isn't. If there is no function to return a pointer to the image, you're pretty much limited to writing it to a temp file and reloading it in a more accessible form.

RageInTheMachine9532
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Re: Not sure what to call it... virtual file possible?

Matt Philmon17-Dec-04 16:15

Matt Philmon

17-Dec-04 16:15

Yeah, I really guess I knew that. I was just hoping there was some arcane use of MemoryStream or some other mechanism that could give me what I need. That would be pretty cool if you could do that... somehow make that function think it's writing to disk when it's actually writing to memory.

Re: Not sure what to call it... virtual file possible?

Daniel Turini18-Dec-04 1:49

Daniel Turini

18-Dec-04 1:49

Matt Philmon wrote:
somehow make that function think it's writing to disk when it's actually writing to memory.
You could use a memory-mapped file (read the MapViewOfFile API call documentation for this).
But it is really overkill.

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TreeView with Bitmap

ramsafe17-Dec-04 11:51

ramsafe

17-Dec-04 11:51

Hi,

I need to display a treeview control node with: a check box, icon, title and a bitmap under the title.

Anyone have any ideas on how to do this?

thanks,

Chuck

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