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I have been working on this for 3 hours straight. So far i've tried everything I could find on the net. This includes:
<br />
for(int i = 0; i < 40; ++i)<br />
{<br />
richTxt.AppendText("Some Text\r\n");<br />
}<br />
<br />
richTxt.SelectionStart = richTxt.TextLength;<br />
richTxt.Focus();<br />
richTxt.ScrollToCaret();<br />
And putting the above code (minus the loop) in an event handler for TextChanged. If someone could please help me with this I would be eternally greatful.
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Hmmm.. I believe you have to set HideSelection to false. Then it should work fine.
"Blessed are the peacemakers, for they shall be called sons of God." - Jesus
"You must be the change you wish to see in the world." - Mahatma Gandhi
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Ah, apparently if I do this:
SetStyle(ControlStyles.UserPaint, true);
SetStyle(ControlStyles.DoubleBuffer, true);
SetStyle(ControlStyles.AllPaintingInWmPaint, true);
and then override OnPaint, it should look something like this:
protected override void OnPaint(PaintEventArgs pe)
{
base.OnPaintBackground(pe);
base.OnPaint(pe);
...
}
The base.OnPaintBackground(pe) being key to a derived class (say, from a Panel) having its background updated properly. I wasn't aware of this before, and it explains some past frustrations with the WinForms.
Any feedback and better suggestions welcome.
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Or just make UserPaint false, then u draw over the background  The is also a PaintBackground option AFAIK.
leppie::AllocCPArticle("Zee blog");
Seen on my Campus BBS: Linux is free...coz no-one wants to pay for it.
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Hmm, I can't find the PaintBackground option. But anyway, I have UserPaint set to true because I want to use DoubleBuffer. It's not exactly clear to me what each other style (e.g. UserPaint, AllPaintingInWmPaint) enables when DoubleBuffer is on. Or, it's not exactly clear to me what I'd lose/gain by making UserPaint false when I have DoubleBuffer on.
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Here you go, its called:
Opaque
If true, the control is drawn opaque and the background is not painted.
leppie::AllocCPArticle("Zee blog");
Seen on my Campus BBS: Linux is free...coz no-one wants to pay for it.
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I'm working with the windows forms DataGrid and running into some problems. The DataGrid is bound to a DataView derived from a Dataset, filled by a SqlDataAdapter. I encounter two problems when I call SqlDataAdapter.Fill(dataSet, "Table"):
1) The DataGrid re-sorts based on the first column.
2) If the user had resized any rows, those rows are set back to the default size.
Basically, I don't want the appearance of the grid to change when I call Fill(). Is this possible, or do I need to manually manipulate the a dataset.
-- James --
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Mmmm....
I have the same problem, but I haven't faced it yet ( now I'm still fixing bugs)... some ideas...
You can set the sorting column in the DataView( so it's supossed that the DataGrid has nothing to do then).
Before calling Fill, you can store in some temporary array or struct ( Memory DataTable with Display/Value columns would be fine , or maybe you can save it like a TableStyle )the pair values of Column Name / Column Width, and restore it after calling Fill...
to avoid ugly things or flickers, it must be possible to say the DataGrid, Hey ! don't draw now... and when all is done... Now you can refresh, but not sure how.
Good luck !
Braulio
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Hi,
Could someone help me with a C# wrapper for a C++ DLL. I have the following function in C++ which needs to be wrapped.
VARIANT _stdcall retVariantArray(void) {
COleSafeArray saRet;
DWORD numElements[] = {10, 10}; // 10x10
// Create the safe-array...
saRet.Create(VT_R8, 2, numElements);
// Initialize it with values...
long index[2];
for(index[0]=0; index[0]<10; index[0]++) {
for(index[1]=0; index[1]<10; index[1]++) {
double val = index[0] + index[1]*10;
saRet.PutElement(index, &val);
}
}
// Return the safe-array encapsulated in a VARIANT...
return saRet.Detach();
}
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Hi,
I want to have a permanent line on a form but the strange thing is that the live vanishes when another window comes over that area.
How can I create a permanent Line on a form ?
Thanks,
Paul
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Try drawing the line in the public void OnPaint(object sender, EventArgs e) event...
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Hi,
I created a typed dataset, but the whole idea is that i want to return the XML information from it. I am using the getXML. This part works fine. What is not working is that there are times when not all the columns would be assigned, and if it is not assigned, it is not returning those tags. Is there a way to declare a default value when a new row is crated in a typed dataset. Thanks,
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I have serialized an object from a project(lets name it x). When i deserialize it from the same project,i am able to recover my object.However, when i try to deserilize that object when i am working in another project, i get an exception " Assembly or file X missing " ?? Could someone tell me why??
Thanks.
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when you serialize an object some information about the object is also saved. This includes the assembly to which the class belongs, the version, culture, the namespace etc. This information is required to recreate the class.
In your case the serializing is done in one assembly & deserializing in another assembly. The type information doesnt match.
One work around is to keep the class you want to serialize in a common assembly. and reference this asssembly in your other projects.
HTH
Rak
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Thanks a lot. That was helpful.
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Does anyone know ANY way of creating a DIB section in C#? I've spent the last few days trying every possible way of creating one. Whenever I call ::CreateDIBSection from the Win32 library, it fails, saying there isn't enough memory. However, after experimentation I realised that it does actually create one, but I can never successfully set the Pixel Format for it, I'm trying to create a pixel format suitable for OpenGL drawing, but it just doesnt work.
I'm using the correct settings for the pixel format, does anyone have any ideas?
Thanks in advance,
Dave
Dave Kerr
focus_business@hotmail.com
http://www.codechamber.com
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I've created a custom control as follows (basic info):
Derives from System.Windows.Forms.Control
Styles set to(true): ResizeRedraw, AllPaintingInWmPaint, UserPaint, DoubleBuffer, SupportsTransparentBackColor, ContainerControl
In the OnPaint handler I draw the control out ...
When I change or set the Background color, it appears the control is being painted OUTSIDE the shape I have drawn (e.g., if I set the background color to Red, I can see a red rectangle with my custom shape drawn 'over it').
I realize this is some kind of region or clipping issue that I have not properly set ... I've been messing with the OnPaintBackground handler, but have not been able to overcome this issue.
Additionally, I have downloaded several custom drawn controls from CP and reviewed the code, and it appears that many of these controls suffer this same or similar problem.
As an overview, here's what I want to do: I am drawing a custom control that is an irregular shape (not a rectangle), that I want to be able to specify various background colors. The colors should (1) not bleed outside the bounding shape and (2) those edges beyond the outside of my control should be transparent when the control is layed over another object of a different color (if that makes sense).
This is my first custom C# control so I'm suffering a tad from lack of working knowledge with the framework and language (although thus far, it's not stopped me until now ... dang-it.  )
TIA,
D.
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As I rememeber,I sets those styles in constructor of class after InitializeComponent().
There is an article in CP by Jibin Pan which create custom shapes for Form which title "Interactive Shaped Forms" in C# section .I don't have the link now but I copy/paste from it here,I guess the scenario is the same for UserControl too:
Create a form with some background color, then set the property TransparenceKey to that color and set the FormBorderStyle to None. You have to set these in the constructor of your UserControl
Override the Form_Paint function You can do it by
protected override void OnPaint(PaintEventArgs e)
or add a new Handler
this.Paint += new System.Windows.Form.PaintEventHandler(Form_Paint)
Using Region and GraphicsPath to set the Region that you want to display. im = new Bitmap("mediaPlayer.jpg");
private void Form_Paint(object sender, PaintEventArgs e)
{
Graphics g = e.Graphics;
Rectangle mainRect = new Rectangle(0, 0, 695, 278);
Region mainRegion = new Region(mainRect);
e.Graphics.SetClip(mainRegion, CombineMode.Replace);
// Create a GraphicsPath object and add a curve.
GraphicsPath myPath = new GraphicsPath();
...
Region ExcludeRegion3 = new Region(myPath);
e.Graphics.ExcludeClip(ExcludeRegion3);
...
e.Graphics.DrawImage(im, 0, 0, 495,278);
// Reset clipping region to infinite.
e.Graphics.ResetClip();
}
I don't know if you do the same in your pani event handler. Hope it helps.
Mazy
No sig. available now.
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Mazy,
Thanks for the response ... I'll start messing with this later this evening. In the meantime, I have added code in my PaintBackground handler that shrinks rectangles down by a single pixel and paints those areas ... cheese but it works for the time ...
I will obviously have to implement a real solution prior to release of the control, so hopefully what you've provided here will kick me in the right direction ...
Thanks again,
D.
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Hi have anybody heard bout any lead or tutorial or something aboout how to send and receive (mainly recieve) SMS (Short Message Service) in .NET.
So far I learned that I should implement the UCP protocol over IP.
Can anyone suggest me something that should ease my work?
Oh yeah I don't want to use any ActiveX or COM components, I want pure .NET.
modified 17-Oct-21 21:01pm.
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does anyone know how to set the left margin when printing a textfile?
I have a form that prints to an Okidata 320 printer and the margin, by default, is set at 1". how can i set it to .5" on the Left margin only?
protected override void OnPrintPage(PrintPageEventArgs ev)<br />
{<br />
[other code here]<br />
<br />
float leftMargin = ev.MarginBounds.Left;<br />
<br />
[etc...]<br />
}
by the way, there is no way to set the margin on the okidata, nor can i move the form any farther to the right to fix this. it has to be done in the code.
thanks.
.gonad.
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thank the Lord no one responded to this, because i feel really stupid.
i just divided the margin by 2 to get .5". 
float leftMargin = ev.MarginBounds.Left / 2;
Thanks!
.gonad.
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I currently have a project which requires me to build a sudo textcontrol. The things, I need to do can't be down with a normal textcontrol. Currently, I've started implementing a basic textcontrol from a picturebox.
I need to be able to do the following
* Implement a cursor
* select existing text
* Cut & Paste
Are there any online references ?
Has anyone done this before?
Any tips?
Thanks
Kevin
Kevin Fowlks
Programmer Analyst
Michigan State University
Center for Remote Sensing & GIS
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after creating setup file by package and deployment wizard when i going to install that setup file on a machine where .net runtime not installed i got error. so i want to full instruction how to create a setup file i .net that will run on a machine where .net runtime not there.
tbhattacharjee
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Out of curiosity, are you using VS2002 or VS2003? My colleagues tell me that VS2003 will prompt to download the .NET runtime if necessary. I haven't been able to test that on a virgin machine.
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