C# Discussion Boards - CodeProject

luisgrimaldo17-May-08 18:19

17-May-08 18:19

Because I know how to do it in C#, and the code i gave you was in C#, but I want to know how it is in C++.
What do you mean by just call it.. how?

thanks.

Re: C# SendMessage in C++

Christian Graus17-May-08 18:35

Christian Graus

17-May-08 18:35

SendMessage(WM_MOVE, wparam, lparam, etc)

You use p/invoke to call stuff in dlls, but the stuff you get to that way, is all stuff you can just call in c++

Christian Graus

Please read this if you don't understand the answer I've given you

"also I don't think "TranslateOneToTwoBillion OneHundredAndFortySevenMillion FourHundredAndEightyThreeThousand SixHundredAndFortySeven()" is a very good choice for a function name" - SpacixOne ( offering help to someone who really needed it ) ( spaces added for the benefit of people running at < 1280x1024 )

file download c# asp.net

irusul17-May-08 13:09

irusul

17-May-08 13:09

I need help on this.

In my project I have a folder called "files". Inside that folder I have many file which I have uploaded. Now ,just by writing the link of the files in the address bar of Web Browser (ex: http://localhost:1234/Server/files/file.rar) anyone can download that file. I want to change that. When the clients are writing the link, instead of downloading the file, another page will be opened (ex: continue.aspx) and by clicking a button on that page, they can download that file (the story is like in rapidshare, filefactory, megaupload ...)

Can anyone tell how this can be done.

Re: file download c# asp.net

Christian Graus17-May-08 13:25

Christian Graus

17-May-08 13:25

I would recommend asking in the ASP.NET forum.

set cursor position on control in active form

baranils17-May-08 11:00

baranils

17-May-08 11:00

Hello

I'm trying to set the focus to a DGV and move the mouse to that DGV
But the position seems to be related to the screen area not the active form area
Thanks for any help

Here is the code I'm using

[CODE] private void HandMade_Click(object sender, EventArgs e)
{
dgv_X.Focus();
int X = dgv_X.Left + dgv_X.Width / 2;
int Y = dgv_X.Top + dgv_X.Height ;
Cursor.Position = new Point(X, Y);
}[/CODE]

Re: set cursor position on control in active form

William Ten Broek17-May-08 11:38

William Ten Broek

17-May-08 11:38

Assuming you are using a TextBox control, try useing the control's SelectionStart and SelectionLength properties

EG:
textBox1.SelectionStart = 4;
textBox1.SelectionLength = 0;

sets the cursor to the fourth char in the text box

Re: set cursor position on control in active form

baranils17-May-08 12:06

baranils

17-May-08 12:06

Thank you

But this is not the solution

First I'm trying to set cursor on a DGV (as explained), not a textbox
Two : the problem was to set the cursor position to that control

Here is the working code :
First : I compute the point P to get to position relative to the form
Second : I translate this point to Screen coordinate relative to the form position using PointToScreen

private void HandMade_Click(object sender, EventArgs e)
{
dgv_X.Focus();
int X = dgv_X.Left + dgv_X.Width / 4;
int Y = dgv_X.Top + dgv_X.Height / 2;
Point P = new Point(X, Y);
Cursor.Position = this.PointToScreen(P);
}

Progrmming with USB in C# (Need a book)

hdv21217-May-08 10:50

hdv212

17-May-08 10:50

hi i want to beginning programming with usb via c# .net, is there any helpFul book about this subJect ?
(wrox,apress or .... )?
thanks

Re: Progrmming with USB in C# (Need a book)

Christian Graus17-May-08 12:52

Christian Graus

17-May-08 12:52

I don't think it's the subject of an entire book, but I think there are some good articles online on the topic.

Re: Progrmming with USB in C# (Need a book)

Giorgi Dalakishvili17-May-08 22:36

Giorgi Dalakishvili

17-May-08 22:36

This might help you:
USB Central[^]

Giorgi Dalakishvili

#region signature
my articles
#endregion

ReportViewer Speed

Amir Jalaly17-May-08 9:24

Amir Jalaly

17-May-08 9:24

Hi

I am using Reportviewer with localreport choice in webforms. I test the query passed to reportviweer and it return results immediately. But when requesting in Web it take about 30 minutes. Also exporting to pdf need even more time. Have somebody any suggestion for me? Which parts are important for increasing speed?

With best Reagrds

Regards Amir Jalaly

TextRenderer.DrawText with TextFormatFlags.ModifyString

Lea Hayes17-May-08 8:09

Lea Hayes

17-May-08 8:09

Hi all!

I am creating a simple user control which renders text within its paint event handler. Under some circumstances (when the output rectangle is very small) the exception "The object is already in use elsewhere." occurs...Which does not make any sense because a) the program is not multithreaded and b) it isn't particuarly complex. This crashing began when I started using the TextFormatFlags.ModifyString flag, and the problem is likewise immediately cured by removing this flag.

Am I using the flag in an incorrect fashion? The itemLabel string is actually updated correctly (end ellipsis is added when displayed).

// Force duplication of string, the original value is changed otherwise.
string itemLabel = new string(item.Label.ToCharArray());

// Use text renderer to output required text.
TextRenderer.DrawText(ctx.Graphics, itemLabel, activeFont, Rectangle.Round(extraLabelBounds), textColour, backgroundColor, TextFormatFlags.EndEllipsis | TextFormatFlags.ModifyString);

If this is a problem, is it possible to get the EndEllipsis version of the string based upon the graphics context, font, output rectangle bounds, and text?

Many thanks!
Lea Hayes

Re: TextRenderer.DrawText with TextFormatFlags.ModifyString

Guffa17-May-08 11:37

Guffa

17-May-08 11:37

What is the class of the exception that you are getting? That might help to determine what it is that is used elsewhere...

Where do you get the Graphics and Font objects from?

Despite everything, the person most likely to be fooling you next is yourself.

Re: TextRenderer.DrawText with TextFormatFlags.ModifyString

Lea Hayes17-May-08 12:34

Lea Hayes

17-May-08 12:34

Hi,

The exception class is System.InvalidOperationException. The Graphics class is as provided by the paint event handler (this is the overriden method protected override void OnPaint(PaintEventArgs e)).

The font object is generated by:

Font activeFont = SystemFonts.DefaultFont;
if(series of conditions)
   activeFont = new Font(activeFont, FontStyle.Bold);

Here is the exception information:

System.InvalidOperationException was unhandled
Message="Object is currently in use elsewhere."
Source="System.Drawing"
StackTrace:
at System.Drawing.Graphics.CheckErrorStatus(Int32 status)
at System.Drawing.Graphics.DrawLine(Pen pen, Single x1, Single y1, Single x2, Single y2)

Whilst the above suggests that the problem is related to the 'DrawLine' method, just simply removing the 'TextFormatFlags.ModifyString' flag prevents the crash from occurring.

For my particular application all I needed was a boolean value which indicates whether the output text was truncated or not. Whilst I have found a workaround for this (listed below), I am still interested to find out why this exception is being thrown...I have double-checked my code and I cannot understand how the objects are being used elsewhere because they are pretty much created each time the paint event is handled. The only things which are in common are the data item and the user control itself.

// Use text renderer to output required text.
if (extraLabelBounds.Width > 0)
    TextRenderer.DrawText(ctx.Graphics, itemLabel, activeFont, Rectangle.Round(extraLabelBounds), textColour, backgroundColor, TextFormatFlags.EndEllipsis);

// NOTE: Unfortunately the following is probably less efficient than with the alternative flag...

// Measure string both with and without end ellipsis to determine if string has overflown or not.
Size measuredA = TextRenderer.MeasureText(ctx.Graphics, itemLabel, activeFont);
Size measuredB = TextRenderer.MeasureText(ctx.Graphics, itemLabel, activeFont, Size.Round(extraLabelBounds.Size), TextFormatFlags.EndEllipsis);

// If label rendered label length is different to the actual item label then a
// tooltip will be made available.
bool hasOverflown = !measuredA.Equals(measuredB);

Thanks,
Lea Hayes

C# WebBrowser

Member 428380717-May-08 7:32

Member 4283807

17-May-08 7:32

Hello, I made a program in C# with a webrowser that loads a website. the website unfortunately has flash ads.

is it possible to block flash? or maybe stop the WebBrowser1 from loading <embed> tags? maybe change the embed tag to a div tag so that it doesnt show? how would i go about doing this? any help is appreciated. thanks

if it is too much to ask, i would appreciate some code? i already tried google with no success Frown | :(

Re: C# WebBrowser

Ravi Bhavnani17-May-08 8:02

Ravi Bhavnani

17-May-08 8:02

Perhaps you could modify the control's content after it's loaded the document? See:

/ravi

My new year resolution: 2048 x 1536
Home | Articles | My .NET bits | Freeware
ravib(at)ravib(dot)com

How connect forms with lines?

Noemi Katinka17-May-08 6:43

Noemi Katinka

17-May-08 6:43

Hi everybody!

I want to connect more form with a line, like in the Access(the database management system).
Just go on this link(http://images.google.ro/imgres?imgurl=http://www.blueclaw-db.com/relationships.gif&imgrefurl=http://www.blueclaw-db.com/tips_tricks.htm&h=421&w=610&sz=17&hl=hu&start=29&um=1&tbnid=M2ryYBfpttJhMM:&tbnh=94&tbnw=136&prev=/images%3Fq%3Daccess%2Btable%26start%3D18%26ndsp%3D18%26um%3D1%26hl%3Dhu%26client%3Dfirefox-a%26rls%3Dorg.mozilla:en-GB:official%26hs%3DZEP%26sa%3DN[^]) and see the picture. I want to make something like that.
How can i do this? Does anyone knew a .dll or something else for this?
Or what type of form should i use and where should i put this forms( the container for this form what should it be) and how can i connect them?

Thanks.

Re: How connect forms with lines?

Anthony Mushrow17-May-08 6:53

Anthony Mushrow

17-May-08 6:53

Well, your main form will need to be an MDI parent, and then you need to add the forms as mdi children. That means that the child forms will be contained within the main form.
You can then use the paint event of your main form to draw the lines between the child forms.

MDI stuff[^] and in the paint event you use e.Graphics to draw from, the graphics class contains methods for drawing lines, rectangles, circles etc. its fairly straight forward.

My current favourite word is: I'm starting to run out of fav. words!

-SK Genius

Game Programming articles start -here[^]-

Re: How connect forms with lines?

Thomas Stockwell18-May-08 3:56

Thomas Stockwell

18-May-08 3:56

Depending on how you have your forms layed out (either MDI or just many forms on the desktop), you could use the ControlPaint.DrawReversibleLine(...) to draw outside the border of the forms.

Regards,
Thomas Stockwell

Programming today is a race between software engineers striving to build bigger and better idiot-proof programs, and the Universe trying to produce bigger and better idiots. So far, the Universe is winning.

Visit my homepage Oracle Studios[^]

[Message Deleted]

pinna_hari17-May-08 4:55

pinna_hari

17-May-08 4:55

[Message Deleted]

Re: String Problem [modified]

PIEBALDconsult17-May-08 5:01