MCSD 70-316 - C# Discussion Boards

Nish Nishant19-Jun-02 11:34

19-Jun-02 11:34

leppie wrote:
just a stupid question: i presume this CCW cant be written in C#, can it?

It can. Write your DLL using C#. Now using Regasm.exe you can register your C# DLL as a COM component. This allows COM clients to instantiate and use your class as if it was in a normal COM DLL.

Nish

Author of the romantic comedy

Summer Love and Some more Cricket [New Win]

Re: Exporting functions

leppie19-Jun-02 20:31

leppie

19-Jun-02 20:31

Thx Nish

but it does not seem to work as I think it should. Have a look at example.

<br />
using System;<br />
<br />
namespace MircDll<br />
{<br />
	public class MircDll<br />
	{<br />
		public static int Test(ref string test)<br />
		{<br />
			test = "HELP me I'M in TROUBLE";<br />
			return 1;<br />
		}<br />
	}<br />
}<br />

I compile then run regasm, but mirc cannot see this as a COM object. What else do i need? Or is Mirc just plain evil?

I will try some more anyways Smile | :)

Re: Exporting functions

Michael P Butler19-Jun-02 1:42

Michael P Butler

19-Jun-02 1:42

I've not looked into calling managed code from an unmanaged app but I very much doubt that MIRC would call a C# dll, you'd be better sticking to C++.

Michael Smile | :)

"Eureka" is Greek for "This bath is too hot"

F:\Dev\ASP.NET\dw\CRC32.cs(87): Operator '<<' cannot be applied to operands of type 'int' and 'uint' ??

Todd Smith18-Jun-02 16:49

Todd Smith

18-Jun-02 16:49

F:\Dev\ASP.NET\dw\CRC32.cs(87): Operator '<<' cannot be applied to operands of type 'int' and 'uint'

For some reason it doesn't like rv |= 1 << (c - i); ??

protected static uint Reflect(uint val, byte c)
{
    uint rv = 0;

    for (uint i=1; i<(c + 1); i++)
    {
        if ((val & 1) != 0)
        {
            rv |= 1 << (c - i);
        }
        val >>= 1;
    }

    return rv;
}

Todd Smith

Re: F:\Dev\ASP.NET\dw\CRC32.cs(87): Operator '<<' cannot be applied to operands of type 'int' and 'uint' ??

Rüpel18-Jun-02 20:54

Rüpel

18-Jun-02 20:54

i haven't tried, but 1 is a integer-constant
maybe this works:

int one=1;
rv |= one << (c-i);

just an idea... Roll eyes | :rolleyes:

:wq

Re: F:\Dev\ASP.NET\dw\CRC32.cs(87): Operator '<<' cannot be applied to operands of type 'int' and 'uint' ??

Feng Qin19-Jun-02 0:56

Feng Qin

19-Jun-02 0:56

You can write like this:

rv |= (uint)(1 << (int)(c - i));
Roll eyes | :rolleyes:

I'm amumu, and you?

Re: F:\Dev\ASP.NET\dw\CRC32.cs(87): Operator '<<' cannot be applied to operands of type 'int' and 'uint' ??

Todd Smith19-Jun-02 6:38

Todd Smith

19-Jun-02 6:38

works like a charm.

thanks

Todd Smith

MCSD 70-316

kasturirawat18-Jun-02 11:26

kasturirawat

18-Jun-02 11:26

Hi,
I'm preparing for "Exam 70-316*—Developing and Implementing Windows-based Applications with Microsoft Visual C# .NET and Microsoft Visual Studio .NET".

Any suggestion\help and cpmments would be apprecaited.

Kasturi

Re: MCSD 70-316

Feng Qin19-Jun-02 1:06

Feng Qin

19-Jun-02 1:06

I always think C# is more same as Delphi in develop windows application:
drag and drop;
hanlde event call back function.

I'm amumu, and you?

Re: MCSD 70-316

Not Active19-Jun-02 8:35

Not Active

19-Jun-02 8:35

Pratice and experience has been the key in my MCSD experience

Center text in a RichTextBox

kyledunn18-Jun-02 10:30

kyledunn

18-Jun-02 10:30

Can anyone tell me how to center selected text in a RichTextBox. I loaded a rtf formatted document from Word that was centered in Word and it displayed centered in the RichTextBox so I think it can be done. I would apprectiate any help. Thanks,

Kyle

Re: Center text in a RichTextBox

John Mautari19-Jun-02 21:13

John Mautari

19-Jun-02 21:13

Use the SelectionAlignment method of RichTextBox class.

richTextBox1.SelectionAlignment(HorizontalAlignment.Center);

Re: Center text in a RichTextBox

John Mautari19-Jun-02 21:17

John Mautari

19-Jun-02 21:17

Ooops, SelectionAlignment is not a method, but a property, so you need to use...

richTextBox1.SelectionAlignment = HorizontalAlignment.Center;

Better I go sleep now... Unsure | :~

Re: Center text in a RichTextBox

kyledunn20-Jun-02 1:00

kyledunn

20-Jun-02 1:00

Thanks, that does the job. Have a nice nap ...

Kyle

derived webservice causes exception

Steve Severance18-Jun-02 6:35

Steve Severance

18-Jun-02 6:35

I have a class (MyComponent) that is derived from WebService. When ever I derive another class from this one the window that you switch to code view from puts up a message saying that the type initalizer for MyComponent threw an exception. What does this mean and how do i fix it?
Thanks.

Steve

Not all who wander are lost...

How to use BinaryWriter to write memory?

Zombies with Coffee, LLC18-Jun-02 5:45

Zombies with Coffee, LLC

18-Jun-02 5:45

My latest place that I'm stuck...

I call a function using DllImport that returns a pointer to some memory. How do I now write it to a file? The Write method doesn't take a pointer.

Thanks guys!

----------------------------------------------------------------

IntPtr pOutputBuffer = IntPtr.Zero;
IntPtr pInputBuffer = bmData.Scan0;

int iResult = wsq_compress_raw( pInputBuffer, ..., ref pOutputBuffer, ... );

FileStream pStream = new FileStream( strPathName, FileMode.Create, FileAccess.Write );
BinaryWriter pWriter = new BinaryWriter( pStream );

pWriter.Write( pOutputBuffer, 0, iCompressFileSize ); // Error

pWriter.Close( );
pStream.Close( );

Re: How to use BinaryWriter to write memory?

18-Jun-02 6:11

This should probably work:

unsafe
{
pWriter.Write((byte*)pOutputBuffer.ToPointer(),0,iCompressFileSize);
}

Re: How to use BinaryWriter to write memory?

Zombies with Coffee, LLC18-Jun-02 6:23

Zombies with Coffee, LLC

18-Jun-02 6:23

Thanks! I was headed there a few times, but...

unsafe
{
pWriter.Write((byte*)pOutputBuffer.ToPointer(),0,iCompressFileSize);
}

Gives the error: cannot convert from a byte* to byte[]

unsafe
{
pWriter.Write((byte[])pOutputBuffer.ToPointer(),0,iCompressFileSize);
}

Gives the error: cannot convert type void* to byte[]

Re: How to use BinaryWriter to write memory?

18-Jun-02 7:25

I'm sorry I have to keep stabbing in the dark but offhand I can't recreate an example to test. So here's the next attempt:

Marshal To the Rescue!!! (System.Runtime.InteropServices.Marshal)

byte[] ba = new byte[iCompressFileSize];
Marshal.Copy(pOutputBuffer,ba,0,iCompressFileSize);
pWriter.Write(ba,0,iCompressFileSize);

Re: How to use BinaryWriter to write memory?

Zombies with Coffee, LLC18-Jun-02 9:14

Zombies with Coffee, LLC

18-Jun-02 9:14

Perfect!!! Nice job and thanks!

Re: How to use BinaryWriter to write memory?

18-Jun-02 9:54

No Prob. I must say I am a little dissapointed in this solution though. Having to allocate and copy the data through another byte[] will slow down your app, especially if this is a non-trivial file you're trying to write.

I'm certain there has to be a way to marshal a memory location as a standard byte[]. After all, its perfectly legal to do this:

byte[] ba = new byte[100];
byte* pb = ba;
*pb = 1;

Re: How to use BinaryWriter to write memory?

Zombies with Coffee, LLC18-Jun-02 10:30

Zombies with Coffee, LLC

18-Jun-02 10:30

I totally agree with you. The memory is already out there, all I need is a byte pointer to it.

But with the bounds checking in place, I don't see a good way of doing it.

Re: How to use BinaryWriter to write memory?

Eric Gunnerson (msft)19-Jun-02 5:54

Eric Gunnerson (msft)

19-Jun-02 5:54

I can't think of any good way to do it, either.

It's trivial in C# to get a pointer to a managed piece of data as long as you fix the managed object, but in this case, you've got a pointer to an unmanaged piece of data.

howto: multi-languaged gui

Rüpel18-Jun-02 0:29

Rüpel

18-Jun-02 0:29

hi there,

i want my app to appear in different languages. the user may choose his prefered language in an options-dialog.

which way would YOU do that?
* define a seperate class, containung a string-member for each string-constant?
* some resource-thing (as it was with the string-tables in C++/MFC-times)
* is there something built-in in C# for that purpose?
* ...

what about the language-files (containing all the strings)? is xml overkill?

i'm currently in the phase of thinking about it, implementing comes later. my current favorite is as described - a class containing a string-member for each message initialized by an xml-file for each language. so when the user changes the language, the class just reads a different xml-file, rewrites all of its string-members and everything is redrawn/reassigned. but i'm not sure, if this is the best way...

so if anyone has some hints, i would be glad to read them...

Rose | [Rose]

:wq

Re: howto: multi-languaged gui

Zombies with Coffee, LLC18-Jun-02 6:09

Zombies with Coffee, LLC

18-Jun-02 6:09

Have you seen the 'Language' property?

Go to your dialog, change the 'Language' to the desired locale, and then .NET handles it for you. Was one of the neatest features I've seen in the IDE yet.

Use Ctrl+Left/Right to switch messages, Ctrl+Up/Down to switch threads, Ctrl+Shift+Left/Right to switch pages.