Re: OleDbType cast to BaseType .Net - C# Discussion Boards

Re: most efficient way to draw triangle

2-Oct-05 8:47

Have you looked at the LineCap's of a Pen? Click[^]

RageInTheMachine9532
"...a pungent, ghastly, stinky piece of cheese!" -- The Roaming Gnome

...---...2-Oct-05 9:24

...---...

2-Oct-05 9:24

Wow. I had no idea.... thanks. Not to get too greedy here, but is it possible to use it for the
technique here? Or will I have to re-write most of it.... thanks again

/////////////////////////////////////////////////////////////////////////////////////////////////////

public Pen[] activePen = new Pen[] { new Pen( Color.Blue, 2 ), new Pen( Color.Green, 2 ), new Pen(Color.Red, 2) };

private int _penIndex = -1;

/////////////////////////////////////////////////////////////////////////////////////////////////////////

private Pen GetNextPen()
{
_penIndex = (_penIndex + 1) % 3;
return activePen[_penIndex];
}

//////////////////////////////////////////////////////////////////////////////////////////////////////

g.DrawLine(GetNextPen(), 250, 250, x, y );

/////////////////////////////////////////////////////////////////////////////////////////////

Re: most efficient way to draw triangle

Robert Rohde2-Oct-05 19:29

Robert Rohde

2-Oct-05 19:29

Sure you can, but you will have to initialize the array of Pen somewhere else (for example in the constructor):

private Pen[] activePen; //btw: members should always be private

public MyClass() {
activePen = new Pen[] { new Pen( Color.Blue, 2 ), new Pen( Color.Green, 2 ), new Pen(Color.Red, 2) };
activePen[0].EndCap = System.Drawing.Drawing2D.LineCap.Round;
activePen[1].EndCap = System.Drawing.Drawing2D.LineCap.Triangle;
activePen[2].StartCap = System.Drawing.Drawing2D.LineCap.Triangle;
activePen[3].EndCap = System.Drawing.Drawing2D.LineCap.ArrowAnchor;
}

Now all your pens have different kind of caps. You can als play around with the other properties of the Pen (like Dash...). You should also look at the CustomeStartCap/EndCap properties. With them you can define special caps (if needed).

OleDbType cast to BaseType .Net

Gedrain2-Oct-05 3:24

Gedrain

2-Oct-05 3:24

Hello,

in the help it says Varchar of the Type OleDBType is mapped to string of the .Net framework. How can i get this information if i have the OleDBType? because i can't find it anywhere this information.

greetings

Sander

Dave Kreskowiak2-Oct-05 7:17

2-Oct-05 7:17

Get what information?

The .Value of the OleDbParameter object? Easy, look at the .Value property.

What the OleDbTypes map to? This map doesn't exist in code. There are no hard-and-fast rules that "map" an OleDbType to a .NET Framework type. For example, you could read a database integer type into many types in the .NET Framework, depending on how you're using the data, an integer, single, double, byte, ...

RageInTheMachine9532
"...a pungent, ghastly, stinky piece of cheese!" -- The Roaming Gnome

Gedrain2-Oct-05 7:21

Gedrain

2-Oct-05 7:21

System.Data.DataTable tableSchema = Connection.GetOleDbSchemaTable( System.Data.OleDb.OleDbSchemaGuid.Columns, new object [ ] {null, null, t.name, null} );

System.Data.DataView dVTableSchema = new System.Data.DataView(tableSchema);
dVTableSchema.Sort = "ORDINAL_POSITION ASC";
for (int i=0; i < dVTableSchema.Count; i++)
{
int dataNumber = (int) dVTableSchema[i]["DATA_TYPE"];
System.Data.OleDb.OleDbType columnType = (System.Data.OleDb.OleDbType) Enum.Parse(new System.Data.OleDb.OleDbType().GetType(), dataNumber.ToString());

okej i have now the columType but know i wanna know how i can read the mapped .net type and i'm not using any oledbparameters.

greetings

Sander

Dave Kreskowiak2-Oct-05 8:29

2-Oct-05 8:29

There is NO MAPPED TYPE! The data can be moved to ANY .NET Framework value type.
The "mapping" is a set of guidelines, not a direct one-to-one relationship between the database type and any .NET Framework types.

RageInTheMachine9532
"...a pungent, ghastly, stinky piece of cheese!" -- The Roaming Gnome

Gedrain2-Oct-05 8:36

Gedrain

2-Oct-05 8:36

hmm that sux because i need the base type so i need to translate it my self?

Dave Kreskowiak2-Oct-05 8:50

Help!! monitor bandwidth usage

2-Oct-05 8:50

You have a problem. Say you read a floating point value from the database. Which .NET type are you going to map it to, Decimal (128-bits), Double (64-bits), Single (32-bits), integer, ...?

Yep. You have to pick an appropriate type to hold the value, since only YOU know what the range of that value should be and what precision you want it to be.

RageInTheMachine9532
"...a pungent, ghastly, stinky piece of cheese!" -- The Roaming Gnome

dunbshy2-Oct-05 3:03

dunbshy

2-Oct-05 3:03

i'm a newbbie in programming, can somebody tell me how to create a program to monitor the bandwidth usage of each host within a network? Can System.Diagnostics.PerformanceCounter be used to monitor a remote computer?

Dave Kreskowiak2-Oct-05 7:09

2-Oct-05 7:09

Monitoring the bandwidth usage is best done by the switch the machine is connected to. If you do it over a remote connection using the Performance counters, you'll skew the usage statistics because transferring the counter information will add to the usage.

RageInTheMachine9532
"...a pungent, ghastly, stinky piece of cheese!" -- The Roaming Gnome

dunbshy2-Oct-05 7:26

dunbshy

2-Oct-05 7:26

thanks for your info Dave. By the way, What namespace or library do i need to investigate in order to write a bandwidth usage monitoring application? Do i need to create a client application and install it in the host machine within a network? the main function of my application will be monitoring the bandwidth usage of each machine within a LAN. And those machines are connected to internet through a router/switch/hub.

You mentioned that monitoring the bandwidth usage is best done by the switch the machinese is connected to. How can this be done? By monitoring every port of the switch? Can you tell me in details?

Dave Kreskowiak2-Oct-05 8:45

2-Oct-05 8:45

The switch already monitors all the ports, all you need to do is communicate with the switch to get the data, provided your switch can do this.

The problem with doing it in a client/server monitoring solution is that the usage will NEVER be 0. Even if the machine is not communicating with anything on the internet. This is because when the monitor starts, the usage will be 0, but will increase the second your client sends it "Heym my usage is 0" to the server. You'll get a steady "hum" from your monitoring software as is constantly sends usage data over the very network card it's monitoring.

RageInTheMachine9532
"...a pungent, ghastly, stinky piece of cheese!" -- The Roaming Gnome

dunbshy2-Oct-05 22:51

dunbshy

2-Oct-05 22:51

How to communicate with the switch/router/hub to get the bandwidth usage data? Pls tell me in which field/namespace/library i need to study on. Thanks.

Dave Kreskowiak6-Oct-05 11:54

6-Oct-05 11:54

There isn't one. What you write depends entirely on how your particular switch, router, whatever exposes this information, if at all.

You'll will PROBABLY have to write a mini Telnet client into your app to get at this stuff.

RageInTheMachine9532
"...a pungent, ghastly, stinky piece of cheese!" -- The Roaming Gnome

Roulette Help!!!

ArsNeo2-Oct-05 1:48

ArsNeo

2-Oct-05 1:48

Here my program:

#include <io.h>
#include <stdio.h>
#include <math.h>
#include <time.h>

int main()
{
int bets, bets_made, bet_num[50], betmoney[50];
short roulette_choice, spinval;
double num_bets;
int betcheck = -1;
long cash = 500;

short bet = 0;

while ( !bet )
{
menumain: printf ( "\n\n\n *** Roulette ***\n" );
printf ( "(1): Place a bet\n" );
printf ( "(2): Check your cash\n" );
printf ( "(3): Mortage your house\n" );
printf ( "(4): Quit Roulette\n" );
printf ( "(5): Retire\n" );
printf ( "Please enter your choice: ");
scanf ( "%d", &roulette_choice );
switch (roulette_choice)
{
case 1: printf ( "\n\n\nHow many bets will you place?" );
scanf ( "%d", &num_bets );
num_bets = num_bets - 1;
bets_made = -1;

while (bets_made < num_bets)
{
bets_made++;
beginning:
printf ( "\nWhat number will you place a bet on (0-36)? " );
scanf ( "%d", &bet_num[bets_made] );

if ( 36 < bet_num[bets_made] || 0 > bet_num[bets_made] )
{
goto beginning;
}

printf ( "How much will you bet on number", "%d", &bet_num[bets_made], "?" );
scanf ( "%d", &betmoney[bets_made] );
}
bet= 1;
break;

case 2: printf ( "\n\nYou have $", "%d", &cash, "at this time." );
break;

case 3: printf ( "\n\nI think you need to go cool it for a while." );
return 0;

case 4: printf ( "\n\nReturning to the main menu now." );
return 0;

case 5: return 0;

default: printf ( "\n\nStay away from the bar for a while would ya?" );
goto menumain;

}
}
spinval = rand () %37;
printf ( "\n\n\nThe winning number is ", "%d", &spinval, "!" );

while (betcheck < num_bets )
{
betcheck ++;
if ( bet_num[betcheck] - spinval == 0 )
{
printf ( "\n\n\nYou won with the number ", "%d", &bet_num[betcheck], "!" );
cash = cash + (betmoney[betcheck] * (37.00/num_bets));
bet = betmoney[betcheck] * (37.00/(num_bets + 1));
printf ( "\nYou made $ ");
scanf ( "%d", &bet);
goto main;
}
}

printf ( "\n\nSorry pal, better luck next time\n" );
goto main;
}

Please tell me where is do mistake. Thank you.

Dave Kreskowiak2-Oct-05 2:21

2-Oct-05 2:21

You've got a lot to learn how forums work.

This is the C# forum, not C++.

All you've done is post your code and ask where the problem is. What problem? A description of what your expecting and what your seeing as the problem might help. Yes, I'm too lazy to cut and paste your code into a C++ project to see what it's doing.

RageInTheMachine9532
"...a pungent, ghastly, stinky piece of cheese!" -- The Roaming Gnome

ArsNeo2-Oct-05 6:47

ArsNeo

2-Oct-05 6:47

i'm doing C Programming for the American Roulette. can u tell me da prob in my program? do u have some sample on roulette? can u send me please? thank you!!

Dave Kreskowiak2-Oct-05 7:04

2-Oct-05 7:04

I hate repeating myself.

YOU have to tell us what the problem is. We're not going to copy and paste your code into a project just to diagnose whatever problem you're not telling us about. What problem are we looking for?

Just posting your code and saying "it won't work" will NOT get you a solution to the problem.

You also have to post in the correct forum. You're posting this question in the C# Forum. You want the Visual C++[^] Forum.

RageInTheMachine9532
"...a pungent, ghastly, stinky piece of cheese!" -- The Roaming Gnome

ArsNeo3-Oct-05 11:55

ArsNeo

3-Oct-05 11:55

i hate repeating myself too. and yeah by the way where's the forum then if not here? i'm doing C Programming. and not Visual C++.******

Dave Kreskowiak6-Oct-05 11:47

6-Oct-05 11:47

Look at the top of any forum page. You'll find the link to Visual C++. Since C is just a subset of C++...

RageInTheMachine9532
"...a pungent, ghastly, stinky piece of cheese!" -- The Roaming Gnome