C# Discussion Boards - CodeProject

Re: Scrolling background in C# Winform??

AFSEKI8-May-07 23:31

8-May-07 23:31

In 2D Games with the tpye you want:

1) There is a screen size background image and you draw onto a part of this big background image and update(Invalidate) just that part so because the user does see only a small portion of the big background image, he thinks he is moving in some directions Wink | ;)

2) Have a look at Code4Fun web site, where you can find some tutorials on game development.

Hope this helps...

IBindingListView Filter Property

Skippums7-May-07 7:11

Skippums

7-May-07 7:11

I want to allow users to create filters by typing in a textbox the filter they wish to apply to any particular column. I want to apply the filter as the user types it, and I want to apply it as if the displayed value were a string. For example, if I have data with numbers 0-23 associated with it, and a user types the number 1, all data with numbers 1 or 10-19 should still be displayed. So essentially, I want to apply the filter expression "[ID] LIKE '1%'", but when I do this I get the error "Cannot perform 'Like' operation on System.Int64 and System.String". How can I prevent this error without making the filter string something like "[ID] = 1 OR ([ID] >= 10 AND [ID] < 20) OR ([ID] >= 100 AND [ID] < 200) OR ..." (because that would get out of hand)? (I also posted this in ADO because I don't really know where it belongs) Thanks.

-Jeff

Re: IBindingListView Filter Property

Dave Kreskowiak7-May-07 7:16

Dave Kreskowiak

7-May-07 7:16

What's the data source you're using? If it's not a database souce, like an Access or SQL database, you can't do filtering. Filtering does not work on every data source, like arrays or lists. You can check the SupportsFiltering property of your BindingSource object to see if the datasource supports filtering.

Dave Kreskowiak
Microsoft MVP
Visual Developer - Visual Basic
2006, 2007

Re: IBindingListView Filter Property

Skippums7-May-07 7:47

Skippums

7-May-07 7:47

Its a database. The same code works if the type of column ID is string.

-Jeff

Re: IBindingListView Filter Property

Dave Kreskowiak7-May-07 7:51

Dave Kreskowiak

7-May-07 7:51

OK. Well, you can't do a LIKE on a number, not even in SQL. If you were to allow LIKE operations on any field, you'd have to retrieve the data from the database, having it convert all the numeric fields to strings before they get sent to your DataSet. THEN, you can do a LIKE filter on it.

Of course, the problem becomes writing that data back to the database if there are any changes to it. You'd have to have a stored procedure convert the "string" data back to their appropriate data types in the INSET and UPDATE queries.

Dave Kreskowiak
Microsoft MVP
Visual Developer - Visual Basic
2006, 2007

how to get color percentage distribution 4 an image?

icecool_567-May-07 6:52

icecool_56

7-May-07 6:52

i am kind of new to C#, i was wondering if there is a way to find how much is there "red" "blue" and "green" in an image? is there any method for that ?
Thx

Iceman

Re: how to get color percentage distribution 4 an image?

Dave Kreskowiak7-May-07 7:12

Dave Kreskowiak

7-May-07 7:12

icecool_56 wrote:
if there is a way to find how much is there "red" "blue" and "green" in an image? is there any method for that ?

Only if you write it. There's nothing in the .NET BCL that will do this for you. Search the articles for "image processing per pixel filters" and you'll find a string of articles by Christian Graus that you can use to built your own method quite easily.

Dave Kreskowiak
Microsoft MVP
Visual Developer - Visual Basic
2006, 2007

Re: how to get color percentage distribution 4 an image?

icecool_567-May-07 7:15

icecool_56

7-May-07 7:15

thx , i appreciate it

Adding rows dynamically in a DataGridView

Subrahmanyam K7-May-07 6:52

Subrahmanyam K

7-May-07 6:52

Hi Friends,

I have a requirement for the DataGridView of Windows Forms and is explained as follows:

1. I have a Quantity textbox in the DataGridView.
2. When the user enter the quantity > 1 (say 3), a total of 3 rows should
be added including the current row with the row quantity in all the rows as 1.
3. This should be achieved only when the user hits the Enter key in the
current cell.
4. If the row where the quantity being modified is in the middle of the grid, the rows next to the current row should get re-positioned based on the number of new rows added.

eg:

ProductDesc      Qty (TextBox)<br />
Compaq Laptop          3                  <br />
DELL DesktopPC         1

When Enter key is pressed in the quantity textbox (for the product Compaq Laptop), the output in the grid should be as follows:

ProductDesc      Qty (TextBox)<br />
Compaq Laptop         1                  <br />
Compaq Laptop         1<br />
Compaq Laptop         1<br />
DELL DesktopPC        1

I have tried with a couple of existing events of the DataGridView but I couldn't achieve.
Please help me with some suggestions.
Thanks.

Subrahmanyam K

Re: Adding rows dynamically in a DataGridView

Salogus7-May-07 18:43

Salogus

7-May-07 18:43

Most likely, your DataGridView has a DataTable as data source. In this case you have to only add 3 rows in the DataTable. Rows in the DataGridView will appear automatically.

Re: Adding rows dynamically in a DataGridView

AFSEKI7-May-07 21:30

AFSEKI

7-May-07 21:30

If your DataGridView is not databound, DataSource = null in this case, then you can use:

DataGridViewRowCollection.Add (Object[]) like:

myDGV.Row.Add(new object[] {"Compaq Laptop", 1});
myDGV.Row.Add(new object[] {"Dell DesktopPC", 1});

BUT, before, be sure that your myDGV has 2 columns with appropriate typers to hold and display your values.

Re: How to Generate a 16 bit Random number?

Dave Kreskowiak7-May-07 7:09

Dave Kreskowiak

7-May-07 7:09

Please don't cross post in multiple forums. I already answered in the General Discussions forum.

Dave Kreskowiak
Microsoft MVP
Visual Developer - Visual Basic
2006, 2007

How to determine exe file size from it's process?

Doan Quynh7-May-07 6:26

Doan Quynh

7-May-07 6:26

Exe File is deleted but its Process is still exist. Can I determine executable file size from its process on RAM?

Re: How to determine exe file size from it's process?

Dave Kreskowiak7-May-07 6:44

Dave Kreskowiak

7-May-07 6:44

Doan Quynh wrote:
Exe File is deleted but its Process is still exist.

That's not possible, AFAIK. Once the .EXE starts, the file remains locked and can't be moved, renamed, opened for write access, or deleted.

Doan Quynh wrote:
Can I determine executable file size from its process on RAM?

Nope. There's no correlation between the two sizes. Had you asked about a .COM application, then yes, memory size is equal to code size in the file because .COM files were a memory-image format. How the code looked in RAM was how it looked in the file. .EXE are a segmented and packed format and can very quickly expand way beyond their file size while being loaded.

Dave Kreskowiak
Microsoft MVP
Visual Developer - Visual Basic
2006, 2007

Re: How to determine exe file size from it's process?

Doan Quynh7-May-07 14:55

Doan Quynh

7-May-07 14:55

I don't thing so.I used VS2005, net frameworrk 2.0,while .exe file started and I can still delete, move or rename it. Other way, I store it in USB, after started it, I remove USB then still only its process.
I wander when .exe32 load, the length of file will load to somewhere on memory?

Re: How to determine exe file size from it's process?

Dave Kreskowiak7-May-07 17:42

Dave Kreskowiak

7-May-07 17:42

Doan Quynh wrote:
while .exe file started and I can still delete, move or rename it

Oddly enough, for a Managed Code application (any .NET EXE), this is true. For native code applications, it's not.

Doan Quynh wrote:
I wander when .exe32 load, the length of file will load to somewhere on memory?

Nope. It's not saved anywhere. The .EXE is literally unpacked and expanded, vaguely reminicent of a .ZIP file. There is nothing that specifies the original file size.

A guide to posting questions on CodeProject[^]

Dave Kreskowiak
Microsoft MVP
Visual Developer - Visual Basic
2006, 2007

How to place write to memory rather than hard-disk?

Khoramdin7-May-07 4:34

Khoramdin

7-May-07 4:34

Hello everyone,

I am currently using a CSV file to store some data locally on the user's computer. Since these data is only required during the life time of the Windows Application, I was wondering if it is possible to store then in the Menory of the computer in order to speed up the process of dealing with the data contained in the CSV file?

Here is the example of the code I am using:

        // 2. Update the "MyListView.txt" file.<br />
        StreamReader streamReaderOne = new StreamReader("MyListView.txt");<br />
        StreamWriter streamWriterTwo = File.AppendText("MyTemp.txt");<br />
        while ((line = streamReaderOne.ReadLine()) != null)<br />
        {<br />
            split = line.Split(delimiterChars);<br />
            line = split[0] + "," + split[1] + "," + split[2] + "," + split[3] + ",SAVE";<br />
            streamWriterTwo.WriteLine(String.Format("{0}", line));<br />
        }<br />
        streamWriterTwo.Close();<br />
        streamReaderOne.Close();<br />
<br />
        File.Copy("MyTemp.txt", "MyListView.txt", true);<br />
        File.Delete("MyTemp.txt");

khoramdin

Re: How to place write to memory rather than hard-disk?

Tarakeshwar Reddy7-May-07 5:10

Tarakeshwar Reddy

7-May-07 5:10

You can pass it as a parameter to the constructor when you move between forms and the data is accessible to all the forms/class OR you could have a static property and store the data in it and retrieve it from any part of your namespace.

Re: How to place write to memory rather than hard-disk?

Khoramdin7-May-07 7:57

Khoramdin

7-May-07 7:57

Hello Tarakeshwar Reddy,

Thanx for your reply. I am slitly confiused here. Do you mean I can pass my entire DATA which can be quiet Large as you mentioned?

Can I ask you to be more detiled with your suggestion or point me to be tutorial which you think and go into details regarding this issue?

Thank you very much and have a great day, mate.

kHORAMDIN

Re: How to place write to memory rather than hard-disk?

Tarakeshwar Reddy7-May-07 9:48

Tarakeshwar Reddy

7-May-07 9:48

If it is large data you could probably save it in a static object. You could have a class called CSVData and that could contain some kind of static storage object which would hold that data as an XML or Dataset, etc. A static method could contain the method to access this data using some kind of parameters passed to it.

I do not have an example, but lets say you have a settings file for you project, you can load them at the startup of your program and the values from that are stored as static properties in a class file(FormColor, Font, BackColor, ForeColor, .....). So make the class read the data once and store it in static properties, which you can access from any part of the program.

Printing GDI Drawing objects

free_soul4247-May-07 4:25

free_soul424

7-May-07 4:25

I am using “System.Drawing.Printing” to print a drawing. Drawing consists a lot of rectangles, and lines. Actually my drawing is very large in size. Can any one tell me how can I devide drawing into pages. I will be thankful to you.
Regards,

Re: Printing GDI Drawing objects

User 24629919-May-07 1:59

User 2462991

9-May-07 1:59

get size of your drawing. create a bitmap using, then get graphics from the bitmap. Now use that graphics object to draw your objects. After finishing drawing objects, copy image to PrintPage event's
argument's graphics object.

Bitmap bmp=new Bitmap(width,height);<br />
//Now create graphics from this bmp<br />
Graphics g=Graphics.FromImage(bmp);<br />
//draw you objects to this graphics object<br />
//g.DrawRectangle(..)<br />
//finish drawing<br />
<br />
Graphics gr=e.Graphics; //e is PrintPageEventArgs object<br />
//int x,y; declare these two variables at class level so that every time you raise PrintPage event they are available with previous values<br />
//x=y=0; initialize before calling<br />
//Loop to draw all image page by page<br />
RectangleF rf=new RectangleF(0,0,printPageWidth, printPageHeight);<br />
gr.DrawImage(bmp,rf);<br />
//now add width and height of rectangle to start<br />
// to get next page x +=printPageWidth<br />
e.HasMorePages=true; //this will cause the print event handler to be called again<br />

Sorry i'm not very legible. But hope you will get an idea.

Aman Tur

modified 9-Jul-22 21:01pm.

C# and java

Askalo7-May-07 4:12

Askalo

7-May-07 4:12

Is it possible to call a java method, with parameters, from a c# program?How?I have to pass text to a java program from c#, receiving an answer.

Re: C# and java

Judah Gabriel Himango7-May-07 4:20

Judah Gabriel Himango

7-May-07 4:20

A simple google search on "Java C# interop" reveals a good deal of results[^].

Tech, life, family, faith: Give me a visit.
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Judah Himango

Re: C# and java

Luc Pattyn7-May-07 6:42

Luc Pattyn

7-May-07 6:42

Hi,

Askalo wrote:
Is it possible to call a java method, with parameters, from a c# program?How?I have to pass text to a java program from c#, receiving an answer.

method or program ?

if you have the source of the Java method you can build a dll using J#.NET and
call its classes/methods as if they were C#.

if you have a program, its language does not matter. You can start it with the Process class
and alter its standard input, output, error streams.

Smile | :)

Luc Pattyn

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