Comments by Muhammad Tufail 1979 (Top 74 by date)

thank you so much. but could you please tell me about it more. i am using EmguCv. actually the problem is , the moving object is small(not too small) so the video survilence lib does not able to detect it.
now i want that to put a point or circle on the moving object and to track it and find information about it..
could you please guide me more about it.
thanks once again

i also did try to take a bitmap image and keep it as a background image of the control. then every thread of picture should take a clone of this picture , draw it self picturebox at specific postion and to make it again the background image, but the problem comes that " the object already in used" by another process. i don't know how to remove this problem??
i also did try to use only one picture for background image every small picture( from 4) should draw on it and to move every one and do the process. but then the problem comes that when one make a clone of background image so it also contains other 3 pictures and thus it makes a continues track of all the 4 pictures. ( a long trail)

thank you so much on your kind reply.
Actually i have 4 pictures , and want to move it. from one point ( fromPoint) to another point (toPoint) each pictures movement is control by separate thread. during this execution i choose these points according to my criteria. Now each thread put picture in the picturebox and then i start moving by changing the left and top position of picturebox by 5.
my problem is... that the line successfully drawn by every picturebox ( picture) but when any of these picturebox comeback on the same root or cross the path of another picture so it wipe up ( delete ) that path. i dont know how to permanent draw the path so that by the movement of any other picturebox should not delete.

sorry for that

could you please solve this problem.
cross-thread operation not valid: Control " accessed from a thread other than the thread it was created

of course picturebox is problematic but could you please recommend for my problem , the control panel?
i am using a bitmap and drawing through graphics then put it into the picturebox.
i dont know how to do it with control panel please.

thank you so much for your explanation.
happy from your comments.

thank you so much, do i need something else with lock?? and please could you tell me that either it will effect my code or running time please?
i tried your idea and now its working good.
thank you so much

i never got this error when i was running this program on my office machine. but when i run it at my laptop so it give me this error

okay i did apply the above, now as i run the project so at the same time i am getting that error

okay thank you i am going toward it now. some time id does not give error even for long long time, while some time gives error after short time of starting .
i don't know whats the problem.

thank you so much on your reply,
in the method DrawCircle, i am running this at the moment on my computer and i got again this error, it is exactly at
Bitmap tempbitmap = (Bitmap)testImage.clone();
while previously i got at
g.DrawImage( rate,p.x-15,p.y-15,30,30);
thanks once again

yes , thats good , its working now...

thanks

please how i could do it without of threading ?

i did try moveCircle without of thread, but still it display some results and then stops. i did try without of threading nether moveCricleThread nor findNextThread. so then i get some other problems that, it doesnot move the circle gradaully and slowly.

here is my form load event , here i define findNextThread Please and then on the form there is a button with then name btnStartSimulator on the click event there i start this findNext thread, then the findNext method start moveCircle thread which i have already given.
private void frmTwoThreads_Load(object sender, EventArgs e)
{
testImage = new Bitmap(@"D:\Practice_Projects\TestPic.png");
rnd = new Random(DateTime.Now.Second);
findNextThread = new Thread(FindNext);
findNextThread.Name = " Find Thread";

}

Actually i want to findNext location and to pass it to moveCircle method, until and unless moveCircle does not move the circle ( gradually and slowly) , i want that, findNext method should wait for it
could you please give me a piece of code, i did try alot but in vain.

i did try on paint event of picturebox as well, i dont know the proper way to pass , but i made a class of eventagrs deriving EventArgs Class.
i put the information i wanted to pass on, but the stupid program does not show the result what i want to ......
i am tired now...

yes enum for direction, and using name rather than number, but using names it was giving problem. actually i have to present this work to my supervisor, thats why i didnt put attention on it at the moment. i will fix it next, but still the problem is to move circle from one location to another. i dont know what to do at the moment.

Actually i am stuck in this problem and not finding any proper solution, thats why i am trying to find out the solution, i did try through timer, through threading , through loops. but still the problem exists.

could you please give me some piece of code just for the sake of example.
please.

sorry i think i made you anger sorry for that.
could you please give me an example with a piece of code please.
here is my movecircle code and drawcircle code please.
private void moveCircle(int stCell, int nxtCell)
{
bool b = false;
Sim_Timer.Stop();

Point pointp = Get_CellCenterPoint(stCell);
Point pointnxt = Get_CellCenterPoint(nxtCell);
if (!b)

{

while (pointp.X != pointnxt.X && pointp.Y != pointnxt.Y)
{
int motionDirection = FindDirection(pointp, pointnxt);
switch (motionDirection)
{
case 1:
//event for Direction1 (North)

pointp.Y -= y_moveUnit;
if ((pointp.Y - pointnxt.Y) < y_moveUnit)
pointp.Y = pointnxt.Y;
DrawCircle(pointp);
Invalidate();
break;

case 2:
//event for Direction2 (NE)

pointp.X += x_moveUnit;
pointp.Y -= y_moveUnit;

if (Math.Abs(pointp.X - pointnxt.X) < x_moveUnit)
pointp.X = pointnxt.X;
if ((pointp.Y - pointnxt.Y) < y_moveUnit)
pointp.Y = pointnxt.Y;
DrawCircle(pointp);
Invalidate();
break;

case 3:
//event for Direction3 (East)

pointp.X += x_moveUnit;
if (Math.Abs(pointp.X - pointnxt.X) < x_moveUnit)
pointp.X = pointnxt.X;
DrawCircle(pointp);
Invalidate();
break;


case 4:
//event for Direction4 ( SE)

pointp.X += x_moveUnit;
pointp.Y += y_moveUnit;
if (Math.Abs(pointp.X - pointnxt.X) < x_moveUnit)
pointp.X = pointnxt.X;
if (Math.Abs(pointp.Y - pointnxt.Y) < y_moveUnit)
pointp.Y = pointnxt.Y;
DrawCircle(pointp);
Invalidate();
break;

case 5:
//event for Direction5 (South)

pointp.Y = y_moveUnit;
if (Math.Abs(pointp.Y - pointnxt.Y) < y_moveUnit)
pointp.Y = pointnxt.Y;
DrawCircle(pointp);
Invalidate();
break;

case 6:
//event for Direction6 (SW)

pointp.X -= x_moveUnit;
pointp.Y += y_moveUnit;
if (Math.Abs(pointp.X - pointnxt.X) < x_moveUnit)
pointp.X = pointnxt.X;
if (Math.Abs(pointp.Y - pointnxt.Y) < y_moveUnit)
pointp.Y = pointnxt.Y;
DrawCircle(pointp);
Invalidate();
break;

case 7:
//event for Direction7 (West)

pointp.X -= x_moveUnit;
if (Math.Abs(pointp.X - pointnxt.X) < x_moveUnit)
pointp.X = pointnxt.X;
DrawCircle

Actually i am using a picture box and an image , i have drawn a circle on that image and want to change the position of that circle in the image and to show it in the picture box.
thats why i am not using paint event, if paint is the best option so how to use it please.

i am doing like this in one timer, ( System.Form.Timer) the problem is , i am using another timer in MoveCircle method. so that is not started and completed within this timer please.

private void Sim_Timer_Tick(object sender, EventArgs e)
{
pictureBox1.Image = testImage;
nxtno = utilObject.SelectNextCell(startCell, rnd);
moveCircle(startCell, nxtno); // call move circle method.
DrawCircle(Get_CellCenterPoint(nxtno));
startCell = nxtno;

}

windows application. please.
i used System.Form.Timer class for it. two timers objects in first i am trying to find the next location, as i get the next location then i want that timer 2 should be started and to move circle from one location to another gradually . and when timer 2 completes its task so timer 1 again search for the new location,
but the problem is that timer 1 does not allow timer 2 to start, as it find the next location.
firs timer1 completes and then timer 2 starts.
this is the problems. please.

i did try like this, but it run only once, how to set the timer for infinite please.
if (startCell != nxtno)
{
moveCircle();
}
private void moveCircle()
{
prvCellCenter = new Point(myGrid.Cells[startCell].CornerPoints[0].X + 22,
myGrid.Cells[startCell].CornerPoints[0].Y + 21);

curntCellCenter = new Point(myGrid.Cells[nxtno].CornerPoints[0].X + 22,
myGrid.Cells[nxtno].CornerPoints[0].Y + 21);

moveTimer.Start();


}
private void moveTimer_Tick(object sender, EventArgs e)
{

if (startCell < nxtno)
{

if (prvCellCenter.X < curntCellCenter.X && prvCellCenter.Y < curntCellCenter.Y)
{
prvCellCenter.X += 5;
prvCellCenter.Y += 5;
}
else if (prvCellCenter.X < curntCellCenter.X) prvCellCenter.X += 5;
else if (prvCellCenter.Y < curntCellCenter.Y) prvCellCenter.Y += 5;
DrawCircle(prvCellCenter);
}

else if (startCell > nxtno)
{

if (prvCellCenter.X > curntCellCenter.X && prvCellCenter.Y > curntCellCenter.Y)
{
prvCellCenter.X -= 5;
prvCellCenter.Y -= 5;
}
else if (prvCellCenter.X < curntCellCenter.X) prvCellCenter.X -= 5;
else if (prvCellCenter.Y < curntCellCenter.Y) prvCellCenter.Y -= 5;
DrawCircle(prvCellCenter);


}
}

thank you once again.
actually it just like a game, (but not indeed). its not like a physical collision. the moving circle will be having the capability to observe the things in front of it, if suddenly added into its path. so as the moving circle will change the direction by calculating alternative way, but i don't know how to get ride of it?. i mean that either the circle should should contains some event handler as something is added or remove from its path so as the circle take appropriate action immegitely .

thank you so much, on your quick responce.
Actually i don't want collision of moving circle and wall. i want that , when for example, an obstical ( Wall) added into the area, so at the same time moving circle should calculate alternative path for itself ( i know that how it should find the path) but i don't know that how to accomplish this exactly at the right time please

how to use it ? could you give me an example please

its okay, but i want to take start. and then i will share my code and idea with you people that where i am going now??
Actually i have been assigned a task of simulator. i have to develop a simulator type program in java, in which there should be a moving object( say a small ball ) the motion of the ball will be according on some algorithm.
user should be allowed to interact with the environment of that moving object, mean that,
some other moving object can be put in, some obstacles can also be put in it. now the motion should be according to that environment
and there are alot of information as well
Now, i want to start as, First to draw x,y coordinate on a panel (Frame area). then add a ball (object )to this area and then it will take start motion. i will record the x,y position of that ball in some list or array ( for further investigation).
i will find the central point of the moving object and on the bases of that central point i will keep the track of that object.
Now about the implementation, i do not know how to draw a graphical area (x,y coordinate) and then how to add a small object ( ball) and how to keep the track of that object.
Simellarly , how much number of pixel per centimeter is ?
thanks

sorry to say, i just need the basic idea, i am student not programmer.
i need some initiatives. not idea about idea please................

public class Teacher : Person
{
private int personalNumber ;
private long cnic;
private int salary;
private short result;
private string remarks;
private Subject teachingSubject;
private List<group> groups;
private DateTime dateOfJoining;
private DateTime dateOfReleave;
private string qualification;
private string scale;

public Teacher()
{
}


public Teacher(int pNo, string name, long cNIC, DateTime DOB, DateTime joiningDate, Subject sub, string qual)
:base (name)

{
PersonalNumber = pNo;
CNIC = cNIC;
DateOfBirth = DOB;
dateOfJoining = joiningDate;
Qualification = qual;

}





// Properties.......///


public int PersonalNumber
{
set
{
personalNumber = value;
}
get
{
return personalNumber;
}
}
public long CNIC
{
set
{
this.cnic = value;
}
get
{
return cnic;
}
}
public int Salary
{
set
{
salary = value;
}
get
{
return salary;
}
}
public short Result
{
set
{
result = value;
}
get
{
return result;
}
}
public string Remarks
{
set
{
remarks = value;
}
get
{
return remarks;
}
}
public Subject TeachingSubject
{
set
{
this.teachingSubject = value;
}
get
{
return this.teachingSubject ;
}

}
public List<group> Groups
{
set
{
groups = value;
}
get
{
return this.groups;
}
}
public DateTime DateOfJoining
{
set
{
dateOfJoining = value;
}
get
{
return dateOfJoining;
}
}
public DateTime DateOfReleave
{
set
{
dateOfReleave = value;
}
get
{
return dateOfReleave;
}
}
public string Qualification
{
set
{
qualification = value;
}
get
{
return qualification;
}
}
public string Scale
{
set
{
scale = value;
}
get
{
return scale;
}
}





}
}

public class StudentDetail
{
private GroupNameEnum degreeTitle;
private string sessionyear;
private string reg_No;
private int marksObtained;
private int totalMarks;
private string remarks; // promoted , dropped , admitted..etc

public StudentDetail()
{
}

public StudentDetail(GroupNameEnum degTitle, string year, string about)
{
DegreeTitle = degTitle;
SessionYear = year;
Remarks = about;
}

public GroupNameEnum DegreeTitle
{
set
{
degreeTitle = value;
}
get
{
return degreeTitle;
}

}
public string SessionYear
{
set
{
sessionyear = value;
}
get
{
return sessionyear;
}
}
public string Reg_NO
{
set
{
reg_No = value;
}
get
{
return reg_No;
}

}
public int MarksObtained
{
set
{
marksObtained =value;
}
get
{
return marksObtained;
}
}
public int TotalMarks
{
set
{
totalMarks = value;
}
get
{
return totalMarks;
}

}
public string Remarks
{
set
{
remarks = value;
}
get
{
return remarks;
}
}

public class Student : Person
{

private int rollNo;
private string fatherName;
private Session session; // it will be like this 2011-2012 etc....
private string yearOfExam;
private StudentDetail detail;
private SubjectCombination subjectCombination;
private Group group;
private DateTime dateOfAdmission;



public Student()
{

}

public Student(int rNo, string name, DateTime DOB, DateTime date_of_Enrolled)
: base(name)
{
RollNo = rNo;
DateOfBirth = DOB;
DateOfAdmission = date_of_Enrolled;

}



public int RollNo
{
get
{
return rollNo;
}
set
{
this.rollNo = value;
}
}

public string FatherName
{
get
{
return fatherName;
}
set
{
this.fatherName = value;
}
}
public Session Session
{
set
{
this.session = value;
}
get
{
return this.session;
}
}
public string YearOFExam
{
set
{
this.yearOfExam = value;
}
get
{
return yearOfExam;
}
}
public StudentDetail Detail
{
set
{
this.detail = value;
}
get
{
return this.detail;
}
}
public SubjectCombination SubjectCombination
{
set
{
this.subjectCombination = value;
}
get
{
return subjectCombination;
}
}
public Group Group
{
set
{
this.group = value;
}
get
{
return this.group;
}
}

public DateTime DateOfAdmission
{
get
{
return dateOfAdmission;
}
set
{
dateOfAdmission = value;
}
}


}

thanx brother.... i have a litel bit confusion in such types which having further branches and different combination at different time i dont know how to handle that.... for example

there is a Session class... which contains different categories (i.e First year , Second year.. etc) now each category having different subject combination ..... i.e Pre- Eng, Pre- Medical.... etc... similarly each combintaion having different types of Subjects... some are optional and some are compalsory... so how to handle the subject combination for the above combination......?

public class Group
{
private int groupID;
private GroupNameEnum groupName;
private int totalCapacity;
private int studentEnrolled;


public Group()
{
}

public Group(int gID, GroupNameEnum gName)
{
GroupID = gID;
GroupName = gName;
}





// Properites ...........


public int GroupID
{
set
{
groupID = value;
}
get
{
return groupID;
}

}

public GroupNameEnum GroupName
{
set
{
groupName = value;
}
get
{
return groupName;
}
}

public int TotalCapacity
{
set
{
totalCapacity = value;
}
get
{
return totalCapacity;
}
}

public int StudentEnrolled
{
set
{
studentEnrolled = value;
}
get
{
return studentEnrolled;
}
}
}

public class SubjectCombination
{
private int combinationID;
private List <subject> subjects;
private string combinationTitle; // pre-medical, pre-engineering, computer-science, simple-Arts..etc


public SubjectCombination()
{
}
public SubjectCombination(int combID, string combTitle)
{
CombinationID = combID;
CombinationTitle = combTitle;
}



public int CombinationID
{
set
{
combinationID = value;
}
get
{
return combinationID;
}
}
public List<subject> Subjects
{
set
{
subjects = value;
}
get
{
return this.subjects;
}
}
public string CombinationTitle
{
set
{
combinationTitle = value;
}
get
{
return combinationTitle;
}
}
}

public class Student : Person
{

private int rollNo;
private string fatherName;
private Session session; // it will be like this 2011-2012 etc....
private string yearOfExam;
private StudentDetail detail;
private SubjectCombination subjectCombination;
private Group group;
private DateTime dateOfAdmission;



public Student()
{

}

public Student(int rNo, string name, DateTime DOB, DateTime date_of_Enrolled)
: base(name)
{
RollNo = rNo;
DateOfBirth = DOB;
DateOfAdmission = date_of_Enrolled;

}



public int RollNo
{
get
{
return rollNo;
}
set
{
this.rollNo = value;
}
}

public string FatherName
{
get
{
return fatherName;
}
set
{
this.fatherName = value;
}
}
public Session Session
{
set
{
this.session = value;
}
get
{
return this.session;
}
}
public string YearOFExam
{
set
{
this.yearOfExam = value;
}
get
{
return yearOfExam;
}
}
public StudentDetail Detail
{
set
{
this.detail = value;
}
get
{
return this.detail;
}
}
public SubjectCombination SubjectCombination
{
set
{
this.subjectCombination = value;
}
get
{
return subjectCombination;
}
}
public Group Group
{
set
{
this.group = value;
}
get
{
return this.group;
}
}

public DateTime DateOfAdmission
{
get
{
return dateOfAdmission;
}
set
{
dateOfAdmission = value;
}
}
public class StudentDetail
{
private GroupNameEnum degreeTitle;
private string sessionyear;
private string reg_No;
private int marksObtained;
private int totalMarks;
private string remarks; // promoted , dropped , admitted..etc

public StudentDetail()
{
}

public StudentDetail(GroupNameEnum degTitle, string year, string about)
{
DegreeTitle = degTitle;
SessionYear = year;
Remarks = about;
}

public GroupNameEnum DegreeTitle
{
set
{
degreeTitle = value;
}
get
{
return degreeTitle;
}

}
public string SessionYear
{
set
{
sessionyear = value;
}
get
{
return sessionyear;
}
}
public string Reg_NO
{
set
{
reg_No = value;
}
get
{
return reg_No;
}

}
public int MarksObtained
{
set
{
marksObtained =value;
}
get
{
return marksObtained;
}
}
public int TotalMarks
{
set
{
totalMarks = value;
}
get
{
return totalMarks;
}

because to discuss with u people... and u find some mistakes and give me some guide lines on that...

yes i have good idea about object oriented programming

this is book is not free to download .....

Yes my brother its working very well.... it gives the desired result...
but i have both Lists of same type ( i.e Supplier (dataType))

But suppliers.Except(it.suppliers) does not give { "C", "D"} it gives again all 4 i.e { "A", "B","c","D}

yes exactly plz the first case is my case of problem plzzzzzz

if u dont mind plz so i can tell u some of detail .......

in database i have one table with the name of Items. 2nd table with the name of Suppliers . but both having many to many relationship. so there is a third table with the name of ItemsSuppliers ( contains just the pk of both tables)...

Now i have a Form to display all the particulars of items.. for the Suppliers i have two listBox ( leftListBox and rightListBox) leftListBox contain all the suppliers exist in database and there is a button to select from it and display it in the rightListBox and ( these should be the suppliers for that particular item and should also be saved with that item )......

Now when i want to retrive an item to display on a Form.. so i want that the supplier of this item should be display in rightListBox while the remaining Suppliers which are not the suppliers of that item should be display in the leftListBox.... ( i.e leftListbox contains all the suppliers but not those which are in the rightListBox)......


For this purpose i get all the suppliers from supplier table and want to remove all the suppliers of that particular item. which has been currently selected.....

the above code until i had tried.... do not remove the supplier of a particular item from the Supplier List..

it showes every time all ( 4 Suppliers inculing the item suppliers too) in the leftList box...
plz i m very Newer to .net plz i havent idea... just learning these techneques


thanx

i have 4 Suppliers in database ( tabel name is Suppliers) and
it.suppliers ( mean item.suppliers) this list contains 2 suppliers at the moment... i mean to say that ( every item has its own suppliers)....

now i want that to exclude these 2 suppliers from the suppliers List and the remaining suppliers should display in the listbox with the name of leftListBox.

i had tried all the following code but not got the right solution..


remainingSuppliers = from sp in suppliers where !it.Suppliers.Contains (sp.ID ) select sp;
var list = from sp in suppliers where !it.Suppliers.Contains(sp) select sp;
var list = (from sp in suppliers where !it.Suppliers.Contains(sp) select sp).ToList();

remainingSuppliers = suppliers.Except(it.Suppliers).ToList ();

foreach (Supplier ss in remainingSuppliers)
{
leftListBox.Items.Add(ss.Name);
}

i had tried all the following code but not got the right solution..


remainingSuppliers = from sp in suppliers where !it.Suppliers.Contains (sp.ID ) select sp;
var list = from sp in suppliers where !it.Suppliers.Contains(sp) select sp;
var list = (from sp in suppliers where !it.Suppliers.Contains(sp) select sp).ToList();

remainingSuppliers = suppliers.Except(it.Suppliers).ToList ();

foreach (Supplier ss in remainingSuppliers)
{
leftListBox.Items.Add(ss.Name);
}

i had tried all the following code but not got the right solution..


remainingSuppliers = from sp in suppliers where !it.Suppliers.Contains (sp.ID ) select sp;
var list = from sp in suppliers where !it.Suppliers.Contains(sp) select sp;
var list = (from sp in suppliers where !it.Suppliers.Contains(sp) select sp).ToList();

remainingSuppliers = suppliers.Except(it.Suppliers).ToList ();

foreach (Supplier ss in remainingSuppliers)
{
leftListBox.Items.Add(ss.Name);
}

i have 2 quries one to bring all the suppliers in the firstList and the seconde query bring all the items with (suppliersList ... and this is my seconed list)

now i want to separate the values of second list from the first and remaing to show in a listbox.....

Now it does not give any error .... but it does not remove all those items which i want to remove from the firstlist......

first list conatain all those items which are in second list......

sorry still i didnt got the solution...

Now it does not give any error .... but it does not remove all those items which i want to remove from the firstlist......

first list conatain all those items which are in second list......

sorry still i didnt got the solution...

Sorry Sir.... it doesnot working ..

it gives a problem that....... Contains method determine wether the value exists or not and return a boolean value...


i dont undersand but its not working plzzzzz.....

Thanx very much.... i have got the idea through (safeFileName) ... Now its work properly.....

But if i want to store this picture in a local folder ( i mean to say that in that folder where the project is currently running )...
then what i should do ????
should i use SaveFileDialogBox ?????

no sorry i dont know about injection...

Actully i m working on a project having ManageItem Form which cotains List of Items with the name of items. the ManageItem form conatains a button with name LookItemButton. at the click event of this button i have an object of another form (i.e ItemLookUpForm) that form cotains a datagrid view which shows all the item with other information.
now i want that when i double Click on DataGridView so the selected item should returnback to ManagItemForm and ItemLookUp Form should be closed or hide...

yes i m calling that form by showDialog method..
i had tried by event handler, delegate , using constructor.... etc ..
but when the called form is going to be closed so thus the item thats i want in return from that form becomes Null....
and i m not able to grip that item in the owner form....