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thanks 
Gary Kirkham
A working Program is one that has only unobserved bugs
He is no fool who gives what he cannot keep to gain what he cannot lose. - Jim Elliot
Me blog, You read
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SmallChange should be number of visible units on the screen. If you're displaying lines of text, small change should do 1 line change. LargeChange should be full page scroll, so if you can see 50 lines of text, it should be 50.
It gets tricker if you're showing something that is not easily divisible to "lines", image editor for example.
Then I would recommend setting SmallChange so that it takes around 25 clicks to scroll full page down and LargeChange as full page scroll.
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Hi,
I have a control which is created in MFC and I wanna use this control in C#. Actually this control has window but we only use window for messages, we are not displaying anything.
I wanna use this control in my program and it is class library in C# without any interface. Is it possible I can use this control in my class library and create object of that control by programming instead of placing this control on any form or window.
I hope I explained my problem, if there is any confusion please let me know to clearify it.
Thanks,
-Samir.
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isamir wrote:
I hope I explained my problem, if there is any confusion please let me know to clearify it.
I would suggest you read about RCW's (Runtime Callable Wrappers). Are you saying your MFC doesn't expose any interfaces? Read this[^] for starters.
- Nick Parker
My Blog | My Articles
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Mfc is exposing interface and events.
I made a wrapper class of MFC ActiveX control and included in my project.
Actually it is MFC ActiveX control without any user interface, it creates window just for messaging and hide it. I want to use this ActiveX control in my C# class library which also has no interface and no windows. When I can trying to create control by calling .CreateControl it give me exception that "windowless ActiveX controls are not supported. Even I tried this in test C# form application and it gives me same error.
Thanks in advance for you help
-Samir.
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hi everyone;
i'm working on a project that includes creating a tool that enables the user to create slide shows that will be later viewed on the net. i dont know in what format the slides are going to be saved. does anyone have any idea about the subject . im sure anything would help...
thanks
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The format for saving the slides is up to you. Are you going to code your own viewer or use something off the shelf.
BTW: PowerPoint already does this. All you have to do is install the PowerPoint Viewer[^].
RageInTheMachine9532
"...a pungent, ghastly, stinky piece of cheese!" -- The Roaming Gnome
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I am rotating text via the Graphics.RotateTransformation technique. After drawing my text string I set the rotation transform back to normal. I then want to draw a "non-rotated" rectangle around the rotated text. Does anyone know how to calculate this rectangle (the largest non-rotated rectangle around the rotated text)??
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Graphics.MeasureString is probably what you want. Depending on your needs, you can resize the SizeF struct you get back. Use that to construct a RectangleF (the PointF for the original will depending on your other transform parameters) and use Graphics.DrawRectangle to draw it.
If you need additional help, please be a little more specific. From what I gather, you want the final surface to display something like this (ASCII art):
_A_
|_B_|
C Is that right?
Software Design Engineer
Developer Division Sustained Engineering, Microsoft
My Articles
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You can use a trick and use Matrix class to rotate points.
For example if you're drawing text within a rectangle (before rotation)
Rectangle rect = ... get draw rectangle ...
... rotate and draw text...
Matrix m = new Matrix();
m.Rotate(angle) or m.RotateAt(m)
Point[] points = new Point[4];
points[0] = new Point(rect.X, rect.Y)
points[1] ... get all 4 corners of the rectangle
for (int i=0; i
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Actually what I needed is a bit more complicated. I first used MeasureString to create a rectangle for the text. Then I want to rotate that rectangle and find the largest "non-rotate" rectangle that rectangle will fit in. I don't care about the location of the largest rectangle, just the width and height. I did figure this out with a bunch of math. here is the routine if anyone is interested.
Note that the rect that is passed into this routine is the rect created using MeasureString.
private RectangleF FindBoundingRect(RectangleF rect, float angle)
{
// Do a quick short cut here if the text is not really rotated
// but is instead horizontal or rotated.
if (angle == 0 || angle == 180 || angle == 360)
{
return new RectangleF(0, 0, rect.Width, rect.Height);
}
else if (angle == 90 || angle == 270)
{
return new RectangleF(0, 0, rect.Height, rect.Width);
}
else if (angle > 360)
{
// Don't handle this case for now.
return new RectangleF(0, 0, 0, 0);
}
// First transform the angle to radians.
float radianAngle = angle * (float)(Math.PI / 180.0F);
float radian90Degrees = 90 * (float)(Math.PI / 180.0F);
// First find the rotated point 1. This is the bottom right point. The radius
// for this point is the width.
float x = (float)(rect.Width * Math.Cos(radianAngle));
float y = (float)(rect.Width * Math.Sin(radianAngle));
PointF p1 = new PointF(x, y);
// Now find point 3 which is also easy. This is the top left point. The
// radius for this point is the height.
x = (float)(rect.Height * Math.Cos(radianAngle + radian90Degrees));
y = (float)(rect.Height * Math.Sin(radianAngle + radian90Degrees));
PointF p3 = new PointF(x, y);
// Point 2, the top right point, is a bit trickier. First find the angle
// from the bottom left up to the top left when the rect is not rotated.
float radianAngleP2 = (float) Math.Atan(rect.Height / rect.Width);
// Now find the length of the diagonal line between these two points.
float radiusP2 = (float) Math.Sqrt((rect.Height * rect.Height) + (rect.Width * rect.Width));
// Now we can find the x,y of point 2 rotated by the specified angle.
x = (float)(radiusP2 * Math.Cos(radianAngle + radianAngleP2));
y = (float)(radiusP2 * Math.Sin(radianAngle + radianAngleP2));
PointF p2 = new PointF(x, y);
// Now based on the original angle we can figure out the width and height
// of our returned rectagle.
float width = 0;
float height = 0;
if (angle < 90)
{
width = p1.X + Math.Abs(p3.X);
height = p2.Y;
}
else if (angle < 180)
{
width = Math.Abs(p2.X);
height = p1.Y + Math.Abs(p3.Y);
}
else if (angle < 270)
{
width = Math.Abs(p1.X) + p3.X;
height = Math.Abs(p2.Y);
}
else
{
width = p2.X;
height = Math.Abs(p1.Y) + p3.Y;
}
return new RectangleF(0, 0, width, height);
}
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Please could you post a full snippet of how to do rotated text as you describe, as that would be useful to know, from my point of view. In olrder apps I have been using LOGFONT stuff and API calls.
Nursey
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To rotate the text use the power of the Graphics class in .net. It has a RotateTransform() method. Here is one link that talks about how to use it. I'm sure you can find other tutorials on the web also.
http://www.c-sharpcorner.com/Code/2004/April/Transformations06.asp
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Hi everybody,,
Very curious to know...
In MFC there were __FILE__ and __LINE__ macro's, which were very helpfull for trace operations.
Are there any equivalents in C# .NET ??
Please let me know.
Thanx in advance.
Saleem
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There are no equivalent directives in C# or VB.NET.
RageInTheMachine9532
"...a pungent, ghastly, stinky piece of cheese!" -- The Roaming Gnome
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Hi All,
I feel that what I'm about to ask might be a really silly question, but I'd appreciate any help.
I want to create an application that exposes Functions and possibly Events that can be accessed through CreateObject() in VBScript (simular to the way you can control Office applications).
Where do I begin? Does the application have to be registered on the host machine in someway and if this is the case, is it simply a case of making a Function public in order to expose it?
Rich
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VBScript will only work with late bound COM objects.
You can begin by implementing the COM-based interfaces in your C# code.
First, mark you assembly so that it is visible to COM.
<br />
[COMVisible(true)]<br />
public class myClass
Next tell the compiler to expose the necessary interface that VBScript understands.
<br />
[InterfaceType(ComInterfaceType.InterfaceIsIDispatch)]
Finally tell the compiler that you want a COM-based entity to see you.
In the project properties mark Register for COM Interop = true;
A word of warning: It is not that easy to use overloaded methods in VBScript so you should avoid these as much as possible.
This signature left intentionally blank
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Thanks for the reply RC!
By what name would I then call the Application from VBScript. How does the enviroment know that Excel is an Excel.Application?
Rich
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You would create and access methods within your script like any other COM component. So if your class was csExcelViewer you would do a
CreateInstance(csExcelViewer) and then do your method calls.
This signature left intentionally blank
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C# is not a scripting language, thus you can't create objects of your C# code in a VBScript. You can create late bound objects in C#, is that what you are looking to do, that is what happens in VBScript when you call CreateObject.
- Nick Parker
My Blog | My Articles
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Thanks for the comment Nick. But, I was actually wanting to create an application in C# that could be called from VBScript using CreateObject.
Rich
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In addition to what Nick and the others say, you could also use the wizard I've created for exactly this task. Take a look here:
A COM class wizard for VS.NET 2003[^].
Regards,
mav
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Has anybody found a way to implement a global message trap, so that no matte what window/control has focus, and no matte where the mouse is pointing, you can listen to the mouse wheel roll messages?
I have seen mouse driver settings that say send messsages to the window being pointed at, rather than the window with focus. I want to develop several controls that respond to mouse wheel events without having focus, and I dont want to set focus to them just so that I can "hear" the mouse wheel messages either.
Any input, pardon the pun, would be great.
Nursey
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