C# Discussion Boards - CodeProject

fftongzhi10-Sep-02 21:39

10-Sep-02 21:39

I write a class and build it in a dll.I used it in a application.And then I
changed my code in some function,and rebuilded it.
Now I need change the dll at runtime,how to do this.
At win32,it will be "loadlibrary"and "freelibrary",at .net，？？？？？
In addition,I didn't change define of the class.

lost my way

Re: how to load a dll at runtime

Nish Nishant10-Sep-02 22:04

Nish Nishant

10-Sep-02 22:04

See :- http://www.codeproject.com/managedcpp/mcppdynamdll.asp

It's for MC++, but you can convert to C# easily I guess

Nish

Author of the romantic comedy

Summer Love and Some more Cricket [New Win]

Review by Shog⁹
Click here for review[NW]

Re: how to load a dll at runtime

fftongzhi10-Sep-02 22:46

fftongzhi

10-Sep-02 22:46

yes ,it can load a dll,but I will overwrite a dll.That means I must unload the dll first,and then overwrite it ,and load it again.
but use assembly ,you can only load a dll,can't unload it.I cann't change the using dll.
???? OMG | :OMG:

lost my way

Re: how to load a dll at runtime

leppie10-Sep-02 23:54

leppie

10-Sep-02 23:54

fftongzhi wrote:
but use assembly ,you can only load a dll,can't unload it.

Unfortunately , the only way to unload an assembly is to unload the appdomain. You will need to load the assembly in a different AppDomain to succeed with your problem. Look at the Supergraph Calculator example on MSDN by Eric Gunnerson (2 parts).

I have attempted this , and failed miserably. So good luck. Smile | :)

Re: how to load a dll at runtime

fftongzhi11-Sep-02 0:13

fftongzhi

11-Sep-02 0:13

Let me try............................. Cool | :cool:

lost my way

Re: how to load a dll at runtime

fftongzhi11-Sep-02 20:47

fftongzhi

11-Sep-02 20:47

Very unfortunately,it don't work either.
It is my codes.
AppDomain appDomain = AppDomain.CreateDomain("mydomain");
Assembly a = appDomain.Load("dlltochange");
Type t = a.GetType("dlltochange.Class1");
MethodInfo mi = t.GetMethod("showstring");
object[] parameter=new object[1];
parameter[0]="hello world";
object obj = Activator.CreateInstance(t);
mi.Invoke(obj,parameter);
AppDomain.Unload(appDomain);

dlltochange is a dll,have Class1 in it,showstring is a function of Class1.
I called the unload,and the dll is in use yet.
And I cann't move the dll to another directory.the parameter of load method can not accept a file name with path.

Will I fail ultimately? Is this a limitation of .net ??? Cry | :((

lost my way

Re: how to load a dll at runtime

Paul Riley11-Sep-02 23:35

Paul Riley

11-Sep-02 23:35

I'm sure there must be a better way but as a workaround, can't you just "DllImport" LoadLibrary and FreeLibrary into your program?

Paul

Re: how to load a dll at runtime

fftongzhi12-Sep-02 1:24

fftongzhi

12-Sep-02 1:24

And can it load a .net dll? Are you sure? WTF | :WTF:

lost my way

Re: how to load a dll at runtime

Paul Riley12-Sep-02 1:31

Paul Riley

12-Sep-02 1:31

Nah... course I'm not sure. But are you sure it won't? Wink | ;)

Paul

Re: how to load a dll at runtime

fftongzhi12-Sep-02 2:11

fftongzhi

12-Sep-02 2:11

sure!!!!

lost my way

Re: how to load a dll at runtime

leppie12-Sep-02 2:01

leppie

12-Sep-02 2:01

Haha, if you think, you will get think you will get this in few hours, forget it, I broke my head for days on end till I was instutionalized for MS migrane. Smile | :)

Just try, try again Smile | :)

Re: how to load a dll at runtime

fftongzhi12-Sep-02 3:58

fftongzhi

12-Sep-02 3:58

Before a hard try,find a broad way is important.Do you think so?
And can you make a demo of importing Roll eyes | :rolleyes:

.net dll?
thanks.

lost my way

Re: how to load a dll at runtime

leppie12-Sep-02 2:28

leppie

12-Sep-02 2:28

Sorry was gonna add this earlier Blush | :O

fftongzhi wrote:
the parameter of load method can not accept a file name with path.

Appends the specified name of the directory to the private path.

[ClassInterface(ClassInterfaceType.None)]<br />
public void AppendPrivatePath(<br />
   string path<br />
);

Re: how to load a dll at runtime

fftongzhi12-Sep-02 16:29

fftongzhi

12-Sep-02 16:29

I have tried it early,but it doesn't work.The dll I load is the dll in current path.append path is useless;
Now the major problem is the dll cann't unload. Unsure | :~

lost my way

Re: how to load a dll at runtime

leppie12-Sep-02 23:41

leppie

12-Sep-02 23:41

Hi

I really want to see this in action too (beside eric's app)!

Have you tried the shadow path, as far as I remember the app will load the assembly in some randon generated directory?

Also, if I remember correctly, Eric makes use of a loader assembly. I cant remmeber the details though Frown | :(

Good luck

Re: how to load a dll at runtime

fftongzhi13-Sep-02 0:03

fftongzhi

13-Sep-02 0:03

Is that AppDomain.SetCachePath(string)??
It doesn't work too.
yes ,Eric made a loader,but what is the key?? Confused | :confused:

lost my way

Re: how to load a dll at runtime

leppie13-Sep-02 0:11

leppie

13-Sep-02 0:11

fftongzhi wrote:
Is that AppDomain.SetCachePath(string)??

No

You need to set this via AppDomainSetup in AppDomain.CreateDomain(). I think it has to be done via that function else it will not function.

Its been a while (May) since I attempted this.

fftongzhi wrote:
yes ,Eric made a loader,but what is the key??

I cant remember the exact details, but he did it, so I guess thats necessary Smile | :)

Re: how to load a dll at runtime

fftongzhi15-Sep-02 18:36

fftongzhi

15-Sep-02 18:36

http://msdn.microsoft.com/library/default.asp?url=/library/en-us/dncscol/html/csharp03122002.asp

http://msdn.microsoft.com/library/default.asp?url=/library/en-us/dncscol/html/csharp05162002.asp

Eric ,he is a expert.;)

lost my way

Re: how to load a dll at runtime

fftongzhi12-Sep-02 23:06

fftongzhi

12-Sep-02 23:06

Any body can help me?????
ooooooooooh!! Sleepy | :zzz:

lost my way

Running VS .NET on NT 4.0

Zinj10-Sep-02 19:30

Zinj

10-Sep-02 19:30

I've been told that VS .NET won't work on NT 4.0. Has somebody installed it successfully?

BTW. Do you have any idea, how can I install NT4.0 on a machine that already has Windows XP, without do destroy the WinXP installation? Is it possible at all?

Any tips are appreciated, thank you!

Re: Running VS .NET on NT 4.0

James T. Johnson10-Sep-02 19:33

James T. Johnson

10-Sep-02 19:33

VS.NET should be fine, but ASP.NET won't run on NT 4.0 (IIS 4.0)

No idea as to your second question.

James
"And we are all men; apart from the females." - Colin Davies

Re: Running VS .NET on NT 4.0

leppie10-Sep-02 21:12

leppie

10-Sep-02 21:12

Zinj wrote:
BTW. Do you have any idea, how can I install NT4.0 on a machine that already has Windows XP, without do destroy the WinXP installation? Is it possible at all?

Try a emulator like VMWare. Very slow though. But OK for testing Smile | :)

OR you can be adventurous and install NT4 on a different partition, it might overwrite the bootloader (i cant remember now ), but you can run XP setup up to first reboot and cancel, the boot loader should be replaced and existing XP boot entry should still be there (make a backup of boot.ini). Wow, its been a few years since I worked on that stuff Smile | :)

CryptHashMessage and C#

User 988510-Sep-02 14:24

User 9885

10-Sep-02 14:24

I have C++ code that uses the function CryptHashMessage that I am trying to port to C#. Do anyone know of something in C#, that does the same thing?

I believe I searched the System.Security.Cryptography completely.

Thomas

modified 29-Aug-18 21:01pm.

Formatting TimeSpan.ToString()

Ingram Leedy10-Sep-02 11:48

Ingram Leedy

10-Sep-02 11:48

I want to format TimeSpan to output "hh:mm:ss", but when I use the generic TimeSpan.ToString() method, it returns "hh:mm:ss.ffffff". I don't need the fractions of seconds, just the plain seconds.

If I try to do something like,

textBox1.Text = span.ToString("hh:mm:ss");

I get a error,
//error - No overload for method 'ToString' takes '1' arguments.

ToString is listed as overridden but not overloaded in the TimeSpan help
docs with VS.Net.

I've tried converting to,

DateTime dt = new DateTime(span.Ticks);
labelClock.Text= dt.ToString("hh:mm:ss");

But this results with something like, "12:00:00".

Any suggestions?

Re: Formatting TimeSpan.ToString()

leppie10-Sep-02 14:18

leppie

10-Sep-02 14:18

Try this

string tempstr = timespan.ToString();<br />
labelClock.Text = tempstr.Substring(0, tempstr.LastIndexOf(".") - 1);

or ... try this (I'm just guessing Smile | :)

)

timespan = Timespan.FromSeconds((int)timespan.TotalSeconds);

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