Question

One-object-selection: Simulating Autocad's break command using VBA

Asked by: ssaqibh

I am trying to modify autocad's break command to suit my needs. When Autocad's command is issued then it prompts to select a line and a pick box is displayed. It allows selection of only one entity. When I try to do the same thing using VBA's selectonscreen command then the object selection prompt is displayed and you can continue to pick objects until you right-click to end the selection process. Can anyone tell me how to program for a one-object selection?

Saqib

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Asked On
2008-12-29 at 22:45:44ID24014922
Tags

one-object-selection

Topic

AutoCAD Software

Participating Experts
2
Points
500
Comments
10

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Answers

 

by: norrin_raddPosted on 2008-12-30 at 11:40:58ID: 23265267

are you using "sendcommand" to run the break command? what exactly are you modify the command to do?

 

by: ssaqibhPosted on 2008-12-30 at 23:07:06ID: 23268429

I want to modify it so that the point where the object is selected is NOT used as the first breakpoint.

Saqib

 

by: ssaqibhPosted on 2008-12-30 at 23:11:20ID: 23268443

I was using the selectonscreen command

 

by: norrin_raddPosted on 2008-12-31 at 07:00:21ID: 23270276

I thought that is what you might be doing. I did the same thing using a button macro like this:
^C^C_break \_f
They way I actually have it setup is to use the same point for both breakpoints like this:
^C^C_break \_f \@  

I looked at doing this using the sendcommand in vba but I dont think it works right, from the help file about the sendcommand method:
<This method is generally synchronous. However, if the command sent with this method requires any user interaction (such as picking a point on the screen) then this method will continue as soon as the user input begins. The command will then continue to be processed asynchronously. >

I didnt have any luck finding out how to stop the selectonscreen method without rightclicking or hitting enter either, not saying it cant be done but if it can, they did a good job of hiding it. This solution may not be the vba one you were looking for but it should work and is relatively low tech, and chances are that you would use a button or palette to run your code anyway, this should work in either one.
If I come across anything else I'll post it.
Good luck, hth and Happy New Year.

 

by: darrenmcwiPosted on 2008-12-31 at 15:13:45ID: 23273533

Try using "SelectAtPoint" method instead of "SelectOnScreen". This allows single entity selection.

 

by: ssaqibhPosted on 2009-01-02 at 01:25:04ID: 23278151

Thanks, Norrin, and many more happy new years to you too.

I am aware of the button macro. But I normally invoke commands by the keyboard instead of the mouse. So this would not be very useful for my needs. Thanks anyway.

Darren, I did try the selectatpoint method but this provides cross-hairs instead of the pickbox. This is not very comfortable for object selection.

Saqib

 

by: norrin_raddPosted on 2009-01-02 at 07:10:06ID: 23279778

well if you dont get your vba solution your could try to add the macro to your keyboard shortcuts in the cui. I just added it to mine using ctrl+b seems to work pretty good.
Seems like there's another way to do that too.
Or you may look see if the getentity method will work for you:
ThisDrawing.Utility.GetEntity
seems like that is a single selection method.
good luck

 

by: ssaqibhPosted on 2009-01-04 at 23:08:38ID: 23293507

GetEntity is what I was looking for. Thanks a lot.

Saqib

 

by: norrin_raddPosted on 2009-01-05 at 05:47:57ID: 23295215

You're welcome, glad it worked.

radd

 

by: darrenmcwiPosted on 2009-01-05 at 22:51:49ID: 23302279

ssaqibh:,

A little clarification, "SelectAtPoint" doesn't display crosshairs  because it's not an interactive command, It takes a point arguement. How you get that point is completely up to you. Using GetPoint (the most logical) does produce the crosshairs. As Norrin_Radd suggested, GetEntity does provide the same interaction (pickbox only) as your original question requested.

Sorry I didn't read that more carefully, I was focusing on a "single selection" and ignored the "pickbox" part of your inquiry. Good catch Norrin_Radd.

20120131-EE-VQP-002

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