Re: What should I do? - C# Discussion Boards

Roger Alsing9-Apr-04 19:55

9-Apr-04 19:55

first you have to mark your method "unsafe" since it uses pointers..

unsafe long UpdateCRC (unsigned long CRC, const char *buffer, long count)

also , c# dont auto convert numbers into bools, so you have to do:

while(--count>0);

//Roger

Re: porting this code to c#

Paolo Ponzano9-Apr-04 20:11

Paolo Ponzano

9-Apr-04 20:11

and for what concern *buffer++??
I find extremly hard to use pointer in C#... =)

thanks for having answered me so fast

Re: porting this code to c#

Mike Dimmick10-Apr-04 3:59

Mike Dimmick

10-Apr-04 3:59

Normally you'd pass the buffer as a byte[] - you probably wouldn't even bother passing count as .NET arrays have the Length property. A non-literal translation would be:

public static uint UpdateCRC( uint CRC, byte[] buffer )
{
   for ( int i = 0; i < buffer.Length; ++i )
   {
      CRC = 
         ( CRC >> 8 ) & 0xFFFFFF ^
         CRCTABLE[ (byte)( CRC & 0xFF ) ^ buffer[i] ];
   }
   
   return CRC;
}

[EDIT] Forgot a cast [/EDIT]

Stability. What an interesting concept. -- Chris Maunder

Re: porting this code to c#

Paolo Ponzano10-Apr-04 5:07

Paolo Ponzano

10-Apr-04 5:07

thanks a lot for your help!
Paolo

What should I do?

lajiyo9-Apr-04 19:39

lajiyo

9-Apr-04 19:39

Hi every one:
I want to get a picture from access.I try to do it in many way.
But I failed.Could you give me some addvices?
Best wishes

Re: What should I do?

Mikko Puonti9-Apr-04 23:26

Mikko Puonti

9-Apr-04 23:26

Maybe An ASP.NET Application to View and Share Photos Online
[^] would be helpful?

Re: What should I do?

lajiyo11-Apr-04 15:16

lajiyo

11-Apr-04 15:16

Thank you:
But it is a sql database.
I want to do it in Access database.
could you help me?

Re: What should I do?

Mikko Puonti12-Apr-04 5:58

Mikko Puonti

12-Apr-04 5:58

Don't remember how things are done in Access, but normally images are stored to BLOBs (SQL datatype). Try to look from Access documentation is there any help available from BLOB datatypes. I am also pretty sure that there is ready example somewhere for access also. Try to use some google Smile | :)

Problems Creating C# Plugin Support for my App

Defiant009-Apr-04 18:57

Defiant00

9-Apr-04 18:57

I've got an application that I'm writing that I want to use plugins with. I've looked through the plugin examples, and to the best of my knowledge have done the same (although in a slightly different fashion) as the examples.

Oh, and sorry about the lack of tabs...I can't seem to get the forum to display them...

My plugin interface:

// The terrain modifier plugin interface.

public interface ITerrainPlugin {
string Name{get;}

void ShowInterface();

void CalculateHeight(float[,] heights);
}

The test plugin (no actual meaningful code...):

// project created on 4/1/2004 at 12:58 PM
using System;

public class TerrainNoisePlugin : ITerrainPlugin {

public string Name {
get {
return "Deffie's Terrain Noise Plugin";
}
}

public void ShowInterface() {
System.Windows.Forms.MessageBox.Show("Interface? Ha! Not yet, bud Smile | :)

");
}

public void CalculateHeight(float[,] heights) {

}
}

And here's the code to load the plugins (each is located in App.StartupPath + "\\Plugins\\Terrain\\" and args contains the class name, which is the same as the dll file name minus the .dll):

try {
Type plugType = null;
Assembly asm = null;
asm = Assembly.LoadFrom(Application.StartupPath + "\\Plugins\\Terrain\\" + args + ".dll");
if (asm != null) {
plugType = asm.GetType(args);
} else {
MessageBox.Show("Assembly is null");
}
if (plugType != null) {
object instance = Activator.CreateInstance(plugType);
if (instance != null) {
MessageBox.Show("Instance isn't null...type is: " + instance.GetType());
} else {
MessageBox.Show("instance is null");
}
ITerrainPlugin plugin = (ITerrainPlugin)instance;
if (plugin == null) {
MessageBox.Show("plugin instance is null");
} else {
plugin.ShowInterface();
}
} else
MessageBox.Show("Type is null");
} catch (Exception eX) {
MessageBox.Show("Error: " + eX.Message, "Error");
}

It complains at this line:
ITerrainPlugin plugin = (ITerrainPlugin)instance;
With the complaint that this is not a valid cast.

Any ideas?

Aaron

Re: Problems Creating C# Plugin Support for my App

leppie9-Apr-04 21:09

leppie

9-Apr-04 21:09

Defiant00 wrote:
MessageBox.Show("instance is null");
TerrainPluginInterface plugin = (TerrainPluginInterface)instance;

Need i say more? [edit] actually I think I read it wrong (why dont ppl use {}?), what does the previous message box say? [edit]

^{top secret}

Re: Problems Creating C# Plugin Support for my App

Defiant0010-Apr-04 8:12

Defiant00

10-Apr-04 8:12

Sorry about the lack of {}'s, since it was just some extra code I stuck in there to try and figure out what was going on (and the fact that it's rather easy to read if the tabs would show up properly...)

Anyways, I went back through and added {}s...by the way, the instance is not null when I run this (which is what has me so puzzled).

Aaron

Re: Problems Creating C# Plugin Support for my App

Mikko Puonti9-Apr-04 23:37

Mikko Puonti

9-Apr-04 23:37

Could it be that you need to define "TerrainPluginInterface" in own dll. And share this DLL with "TerrainNoisePlugin" and your application code? (Or define "TerrainPluginInterface" in same dll with your application and use application's "TerrainPluginInterface" in your plugin code.) Where is "TerrainPluginInterface" coming to your application code?

(BTW: Normal naming convention for interfaces is "I<interface name="">". For example: "ITerrainPlugin". ... and yes people really should use those bracers. Code is not writen for computers, it is written for humans (except binary machine code).)

Re: Problems Creating C# Plugin Support for my App

Defiant0010-Apr-04 8:20

Defiant00

10-Apr-04 8:20

Ah...I guess that's what I was missing there (at least I hope that's what it is). I'm looking back over the tutorials...yeah, guess I skipped a bit too much of the explanation in favor for the code.

Also, didn't know about the naming convention, thanks for that (I've changed it now). As far as using the braces...well, if the forums would show tabs (although I imagine there's a way that I just don't know of) then it would be nice and readable anyways...but oh well...

Anyways, thanks for the suggestions, I'll look into it and hopefully have it working shortly.

Aaron

**And as an update (if anyone cares :P ) that fixed it.**

Re: Problems Creating C# Plugin Support for my App

SethGeco20-Nov-08 5:47

SethGeco

20-Nov-08 5:47

hi what tutorial did you use for your application as i'm also
trying to have plugin support on my application.

thanks dennis

Double Click Interval

Tom Clement9-Apr-04 15:43

Tom Clement

9-Apr-04 15:43

Hi everyone,

I'm trying to figure out how to determine the DoubleClick interval that's set in MouseSettings. Does anyone know where this is kept? Is there a .NET API for it, or should I grap it from the registry?

Thanks for your help,
Tom Clement
Apptero, Inc.

Re: Double Click Interval

Tom Clement9-Apr-04 15:50

Tom Clement

9-Apr-04 15:50

Hi again,
A search of the Registry answered my question for me. It is stored in HKCU\Control Panel\Mouse in the value named DoubleClickSpeed. It appears to be in Milliseconds.
Tom Clement
Apptero, Inc.

Re: Double Click Interval

Tom Clement9-Apr-04 15:53

Tom Clement

9-Apr-04 15:53

Is it a sign of insanity to talk to yourself?

SystemInformation.DoubleClickTime

Tom Clement
Apptero, Inc.

Re: Double Click Interval

Nick Parker9-Apr-04 17:40

Nick Parker

9-Apr-04 17:40

Tom Clement wrote:
Is it a sign of insanity to talk to yourself?

Nope, just when you argue with yourself. Wink | ;)

- Nick Parker
My Blog | My Articles

Re: Double Click Interval

leppie9-Apr-04 21:05

leppie

9-Apr-04 21:05

Sometimes is best to try put a problem on 'paper'. That way you know the problem is correctly formulated, and when you get good at programming a different look at things is sometimes all that is needed to grasp the solution. Smile | :)

^{top secret}

Re: Double Click Interval

Tom Clement10-Apr-04 6:29

Tom Clement

10-Apr-04 6:29

leppie wrote:
when you get good at programming

Geez, I hope that some day (soon, before I die) I'll get good at programming.... Wink | ;)

Tom

Import to SqlServer

quocbao9-Apr-04 14:29

quocbao

9-Apr-04 14:29

I got a text file that i exported from SQL Wizard and i named bank.txt.
i want to write out a program that allow to import bank.txt file to SQL Server but i do not know how to do it.
So can anyone help me or show me where to get the source code.
Thank a lots.

quoc

Re: Import to SqlServer

dabuskol10-Apr-04 20:37

dabuskol

10-Apr-04 20:37

Hi,

Try reading your textfile using the "streamreader" and save it one at a time using the INSERT statement into your SQL server.
IF your text file is big or you often do it, might as well use the DTS in #C. I haven't tried it but I know it will work.

/dabuskol

Help can't figure this one out with OleDbDataAdapter and acesss

MeterMan9-Apr-04 13:52

MeterMan

9-Apr-04 13:52

I have a program that works perfectly fine but i want to change one thing.
my database data.mdb is on the root of my c drive.
I want to put it in my project directory. I would assume i could move the database anywhere i want and just reconfigure the oleadapters accordingly. Well for some reason its not working as i thought it should.

Here is what i do.
I right click on the Adapter1 and hit configuration.
I hit new connection and select the connection for access.
i then select my database and test the connection. It works fine.
so i know have ACCESS..\data.mdb.Admin
I then hit Query builder and select my columns Help and Information.
I then hit finish.
I then go back to the configuration adapter and want to add
WHERE (Help = ?)
so query looks like this

SELECT Help, Information FROM Csharp WHERE (Help = ?)

i hit next and get the following error.

OleDbCommand.Prepare method requires all variable length parameters to have an explicitly set non-zero Size.

I don't understand the problem cause if i reload my program from my backup files. putting it back to the state of where the database was in the c:
it works perfectly.

Confused | :confused:

Any Idea would be great

Win32newb
"Making windows programs worse than they already are"

Win32newb
"Making windows programs worse than they already are"

Re: Help can't figure this one out with OleDbDataAdapter and acesss

leppie9-Apr-04 21:14

leppie

9-Apr-04 21:14

I have seen this before, it appears VS.NET keeps the references in the DataAdapters, my remedy was to recreate them all. Easy when u have stored procedures, bad with select statements Hmmm | :|

^{top secret}

Re: Help can't figure this one out with OleDbDataAdapter and acesss

MeterMan9-Apr-04 21:21

MeterMan

9-Apr-04 21:21

I couldn't figure it out. Maybe Heath or one of the other MVPS can explain this. Here is what I ended up doing to fix it which basically relates to what you stated.

I said heck with the adapter query.
I left it as the default of
SELECT Help, Information, ID FROM Csharp

i then in my code instead of using my old parm method i do this instead.

string strSQL = "SELECT * FROM Csharp WHERE Help = '" +    
                 comboBox1.Text.ToString() + "'";	
oleDbSelectCommand1.CommandText = strSQL;
dataset.Csharp.Clear();
oleDbDataAdapter1.Fill( dataset );

works perfectly
thanks for your reply by the way

Win32newb
"Making windows programs worse than they already are"

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