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im afraid i dont really understand could you mock me up an example of 2 randoms in one method?
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Hi,
Are you by any chance a graduate of the school of "I'm absolutely not going to read the documentation" programming? The reason I ask is that the title of your original post was the answer, i.e you knew that you wanted to seed the random number generator.
When you were told how to do it, you asked for code. I have just opened the documentation for the Random class and on the introductory page is a full example showing more than one method of seeding the generator.
If you had just done the same then your problem would have been solved in less time than it took to post the question.
Alan.
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well that was a nice response,I presume your from the old school of elitist programmers who bash new people to a language or just say try google Considering i've been looking into this for 3 days hence why i knew what i was doing just not sure how to impliment it and not really understooding the code thats why i posted. I also asked for a interpretation of the code as a general rule to work from not for someone to do it for me. Im sorry ive my lack of knowledge causes you offence but as a rule of thumb forums are to learn from
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Hi,
A lack of knowledge does not offend me in the slightest and I am more than willing to help. The point I made was that you used "Random seeds?" for the title of your post yet you appeared not to have done any research on that very topic.
You must have thought it a bit odd that something called a random number generator was giving the same sequence every time it was used.
Surely the place to start was with the documentation.
Alan.
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As I have understood your post, you are having troubles with random numbers generation.
Here is a solution, that may be helpful.
As it has been noted, a seed number is used to start numbers generation. In most occasions this number is dependent on current time, for example, Environment.TickCount can be such a seed. What happens sometimes, is that number sequences are being generated too fast, so that the time-related seed is not changed. This may result in troubles, when you are generating numbers not in one sequence. Here is a code example. We are generating an array of objects typed sample, and each object contains a set of randomly generated numbers.
class sample
{
double[] dblMyArray = new double[20];
public sample()
{
Random rndObj = new Random(Environment.TickCount);
for (int i = 0; i < dblMyArray.Length; i++)
dblMyArray[i] = rndObj.NextDouble();
}
}
class Program
{
static void Main(string[] args)
{
sample[] mainArray = new sample[10];
for (int i = 0; i < mainArray.Length; i++)
mainArray[i] = new sample();
}
}
Now, what will happen is a sad fact: all the objects in mainArray will have THE SAME values in dblMyArray. This is because modern computations are fast, and time related seed cannot change fast enough. You may run this code and check out the values.
If you have a similar problem, the solution is to sleep a program for a short time, I used 1ms. This way the seed number will change, and each time you'll have different sequences.
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public class Globals2
{
double[] dblMyArray = new double[20];
}
public class Globals3
{
public static int comp;
public static Random cc = new Random(Environment.TickCount);
for (int i = 0; i < dblMyArray.Length; i++)
dblMyArray[i] = cc.NextDouble();
}
public class Globals4
{
public static int comp;
public static Random uc = new Random(Environment.TickCount);
for (int i = 0; i < dblMyArray.Length; i++)
dblMyArray[i] = cc.NextDouble();
}
lblwarning.Text = "Warning";
MessageBox.Show("personal attack");
int userresult = Globals4.user + Globals.army;
sample[] mainArray = new sample[10];
for (int i = 0; i < mainArray.Length; i++)
mainArray[i] = new sample();
Globals3.comp = Globals3.cc.Next(1, 100);
Thread.Sleep(10);
sample[] mainArray = new sample[10];
for (int i = 0; i < mainArray.Length; i++)
mainArray[i] = new sample();
Globals4.user = Globals4.uc.Next(1, 100);
Globals4.user = Globals4.user + Globals.army;
MessageBox.Show("Computer rolled " + Globals3.comp + " You rolled " + Globals4.user + " with an army strength of " + Globals.army + " equals " + userresult + "");
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just got round to trying it with no luck
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just an update i got it working with the threadtime scheduling thanks for the tip
however the 2nd bit of code still isnt working so i placed it in its own fucntion
/ rolling function
public class Globals6
{
public static int dilemma = 0;
public void random1()
{
Random dl = new Random(Environment.TickCount);
Globals5.dilemma = dl.Next(1, 2);
DialogResult res;
if (Globals5.dilemma == 1)
{
res = MessageBox.Show("Ban same sex marriage", "Dilemma", MessageBoxButtons.YesNo);
if (res == DialogResult.Yes)
{
Globals.notoriety -= 1;
}
else if (res == DialogResult.No)
{
Globals.notoriety += 1;
}
if (Globals5.dilemma == 2)
{
res = MessageBox.Show("Political protest, do you use essesive force?", "check", MessageBoxButtons.YesNo);
if (res == DialogResult.Yes)
{
Globals.notoriety -= 1;
}
else if (res == DialogResult.No)
{
Globals.notoriety += 1;
}
}
}
}
}
and call it by putting random1(); in main how ever i get this error
Error 2 The name 'random1' does not exist in the current context C:\Users\ant\Documents\Visual Studio 2008\Projects\game\game\Form1.cs 119 17 game
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bump plz ive managed to get it working just not randomizing the second code it just plays message 1 constantly
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I seem to be having an issue with this statement, I keep getting a 'datatype mismatch in criteria expression' error. The ID in the expression is a string, but I have tried converting it to an int with no luck. IN the table the ID field is an autonumber int. Anyone see any problems?
public void playSelection(string ID)
{
OleDbConnection musLibConn = new OleDbConnection();
utility util = new utility();
musLibConn.ConnectionString = @"Provider=Microsoft.Jet.OLEDB.4.0;Data Source=C:\Program Files\GeneSys\Library.mdb";
musLibConn.Open();
OleDbCommand selLib = new OleDbCommand("SELECT Path FROM Library WHERE ID = '"+ID+"'", musLibConn);
OleDbDataReader drLib = selLib.ExecuteReader();
int idxPath = drLib.GetOrdinal("Path");
WMP.URL = drLib.GetValue(idxPath).ToString();
}
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IDs are typically numbers and therefore should not be in quotes.
Christian Graus
Driven to the arms of OSX by Vista.
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jetspike wrote: in form2 I create an instance of form1
so Form1 creates Form2, and Form2 creates yet another Form1; how many Forms do you actually see? if you create three but only see two, is that sufficient reason to believe the third one will magically coincide with the first? how would the second Form1 relate to the first Form1, except for being twins?
It is sickening to see this kind of posts all the time, it just indicates people are not willing to study the basic stuff, read a book on a programming language, then read a book on object orientation, then read some of the hundreds of articles on the subject available here on this site,. until they understand what they are doing.
And don't bother to reply.
Luc Pattyn [Forum Guidelines] [My Articles]
- before you ask a question here, search CodeProject, then Google
- the quality and detail of your question reflects on the effectiveness of the help you are likely to get
- use the code block button (PRE tags) to preserve formatting when showing multi-line code snippets
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jetspike wrote: Form1 form1 = new Form1();
As has been said, people post this stuff all the time, and what it tells us is that you understand close to nothing about the code you are writing. Read a book on OO and a book on C#, learn some basics.
Christian Graus
Driven to the arms of OSX by Vista.
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hi
How Can i Change the Image instance Size
it could not be used as following
image.Size.Height=200;
it will raise an exception :
"Cannot modify the return value of 'System.Drawing.Image.Size' because it is not a variable"
so i tried to use the following code:
<br />
int size = image.Size.Height;<br />
size= 200;<br />
and also :
<br />
Size size = image.Size;<br />
size.Height= 200;<br />
but it does not work
please help me
thanks
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It seems you are not understanding some basics of imaging. To resize an image, you need to specify a method to use, and then you need to build the image at the new size. Changing just the height is impossible because, apart from other things, you're not defining what you really want. Assuming the current height is < 200, do you want a new blank area under the image, or do you want to stretch it ? If it's greater, do you want to crop the image, or compress it ? In either case, changing height without changing width and making the image fit, will distort it.
You need to create a new bitmap of the size you want, select it into a Graphics object, and use that to draw your old image onto the new one, either distorting it, or drawing just the portion you want onto the portion of the new bitmap as required.
Christian Graus
Driven to the arms of OSX by Vista.
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I want to know how can save an image into SQL Server and retrive it again into Picture control using SqlDataReader? here is my code to read from the database and now I need to read the image in addition to the data I ma reading:
private void get_staff_info()
{
this.Cursor = Cursors.WaitCursor;
sql_connection = new SqlConnection("Data Source=.\\SQLEXPRESS;initial catalog=ssis_database;integrated security=true;");
sql_connection.Open();
sql_command = new SqlCommand("sp_get_staff_info_by_id", sql_connection);
sql_command.CommandType = CommandType.StoredProcedure;
sql_command.Parameters.Add("@staff_id", SqlDbType.Int).Value = staff_id;
sql_reader = sql_command.ExecuteReader();
if (!sql_reader.HasRows)
{
MessageBox.Show("staff not found!!", "error", MessageBoxButtons.OK, MessageBoxIcon.Asterisk);
}
else
{
if (sql_reader.Read())
{
lblCPR.Text = sql_reader["staff_cpr"].ToString();
lblFullName.Text = sql_reader["staff_name"].ToString();
lblBirthday.Text = Convert.ToDateTime(sql_reader["staff_birthday"]).ToString("dd-MMM-yyyy");
TimeSpan age = DateTime.Now - Convert.ToDateTime(sql_reader["staff_birthday"]);
int years = age.Days / 365;
int months = (age.Days - (years * 365)) / 30;
string strAge = String.Format("{0}y", years);
lblBirthday.Text += " [" + strAge + "]";
lblGender.Text = sql_reader["gender_name"].ToString();
lblNationality.Text = sql_reader["country_name"].ToString();
lblFlat.Text = sql_reader["staff_address_flat"].ToString();
lblBuilding.Text = sql_reader["staff_address_building"].ToString();
lblRoad.Text = sql_reader["staff_address_road"].ToString();
lblBlock.Text = sql_reader["staff_address_block"].ToString();
lblTelephoneHome.Text = sql_reader["staff_telephone_home"].ToString();
lblTelephoneMobile.Text = sql_reader["staff_telephone_mobile"].ToString();
lblTelephoneMobile2.Text = sql_reader["staff_telephone_mobile2"].ToString();
lblEmailAddress.Text = sql_reader["staff_email_address"].ToString();
lblGrade.Text = sql_reader["grade_name"].ToString();
lblStep.Text = sql_reader["step_name"].ToString();
lblSalary.Text = Convert.ToDecimal(sql_reader["staff_salary"]).ToString("BD #,###,##0.000");
lblBank.Text = sql_reader["bank_name"].ToString();
lblBankAccount.Text = sql_reader["staff_bank_account"].ToString();
sql_reader.Close();
}
}
this.Cursor = Cursors.Default;
}
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Hi,
I haven't done that myself yet with SQL Server, however I remember from other posts there basically are two ways: either store the binary data as a BLOB, or use Base64 encoding and store it as a string.
They both involve a byte[] and a MemoryStream, then you can restore the image with Image.FromStream
I suggest you search CodeProject for the keywords in your subject line and the ones I just gave you.
Luc Pattyn [Forum Guidelines] [My Articles]
- before you ask a question here, search CodeProject, then Google
- the quality and detail of your question reflects on the effectiveness of the help you are likely to get
- use the code block button (PRE tags) to preserve formatting when showing multi-line code snippets
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simplest way is that add a new column of 'Image' type, convert image to byte[] using MemoryStream. Eg
MemoryStream ms = new MemoryStream();
image.Save(ms, imageFormat);
ms.ToArray();
then insert new row and set byte[] to that Image column using SQL Param.
When you wanna retrieve that image, just use Select command as usual.
TVMU^P[[IGIOQHG^JSH`A#@`RFJ\c^JPL>;"[,*/|+&WLEZGc`AFXc!L
%^]*IRXD#@GKCQ`R\^SF_WcHbORY87֦ʻ6ϣN8ȤBcRAV\Z^&SU~%CSWQ@#2
W_AD`EPABIKRDFVS)EVLQK)JKSQXUFYK[M`UKs*$GwU#(QDXBER@CBN%
Rs0~53%eYrd8mt^7Z6]iTF+(EWfJ9zaK-iTV.C\y<pjxsg-b$f4ia>
--------------------------------------------------------
128 bit encrypted signature, crack if you can
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Xmen wrote: When you wanna retrieve that image, just use Select command as usual.
how?
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select ImageColumnName from TabelName
TVMU^P[[IGIOQHG^JSH`A#@`RFJ\c^JPL>;"[,*/|+&WLEZGc`AFXc!L
%^]*IRXD#@GKCQ`R\^SF_WcHbORY87֦ʻ6ϣN8ȤBcRAV\Z^&SU~%CSWQ@#2
W_AD`EPABIKRDFVS)EVLQK)JKSQXUFYK[M`UKs*$GwU#(QDXBER@CBN%
Rs0~53%eYrd8mt^7Z6]iTF+(EWfJ9zaK-iTV.C\y<pjxsg-b$f4ia>
--------------------------------------------------------
128 bit encrypted signature, crack if you can
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Im creating multiple buttons based on artists from a database. i am creating the buttons perfectly but have a problem assigning click events to individual buttons. I want to be able to click a button and open another form with the info and songs from the artist that was on that particular button.
I am an amateur programmer(lol), so dont ride me too bad if the solution is painfully obvious.
public partial class frmSearchArtists : Form
{
OleDbConnection musLibConn = new OleDbConnection();
utility util = new utility();
string artist;
int i = 0;
public frmSearchArtists()
{
InitializeComponent();
musLibConn.ConnectionString = @"Provider=Microsoft.Jet.OLEDB.4.0;Data Source=C:\Program Files\GeneSys\Library.mdb";
musLibConn.Open();
OleDbCommand selLib = new OleDbCommand("SELECT DISTINCT Artist FROM Library ORDER BY Artist", musLibConn);
OleDbDataReader drLib = selLib.ExecuteReader();
int idxArtist = drLib.GetOrdinal("Artist");
Button btn;
while(drLib.Read())
{
btn = new Button();
btn.Text = drLib.GetValue(idxArtist).ToString();
artist = drLib.GetValue(idxArtist).ToString();
btn.Name = artist;
btn.ForeColor = Color.White;
btn.Size = new System.Drawing.Size(120, 60);
btn.BackColor = Color.MidnightBlue;
btn.Font = new Font("Arial Black", 10, FontStyle.Bold);
btn.Click += new System.EventHandler(this.btnArtist_click);
flp.Controls.Add(btn);
i++;
}
}
private void btnArtist_click(object sender, EventArgs e)
{
util.setArtist(artist);
frmArtist frmArtist = new frmArtist();
frmArtist.Show();
}
}
Any ideas or just suggestions to make existing code better?
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Jon Henry wrote: I want to be able to click a button and open another form with the info and songs from the artist that was on that particular button.
Use the sender parameter to identify the button which is clicked. Use the Tag[^] property in button to keep you custom information about that button. You can access it like the below in button handler,
private void btnArtist_click(object sender, EventArgs e)
{
Button clickedButton = sender as Button;
string artist = (string)clickedButton.Tag;
.....
}You set tag like
while(drLib.Read())
{
Button btn = new Button();
btn.Tag = drLib.GetValue(idxArtist).ToString();
}
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