topic Re: Error when escaping GetPoint in .NET Forum

Error when escaping GetPoint

NickBrege — Thu, 16 Mar 2023 14:07:24 GMT

I am using the GetPoint function to prompt the user to select a point on screen. However if the user changes their mind & presses escape, my code throws an exception. I know I can use a Try/Catch to handle it, but I was wondering if there was a better way, as Try/Catch is not very elegant. The pertinent code is below....

Dim origin As Double() = CType(acadDoc.Utility.GetPoint(, "Select part origin: "), Double()) xOrigin = origin(0) yOrigin = origin(1)

BTW ... I am using the COM/Interop API & VB.Net

Thanks...

Re: Error when escaping GetPoint

hippe013 — Thu, 16 Mar 2023 14:18:46 GMT

Do you have to use the COM API for a particular reason? The following is a quick snippet for prompting the user for a point using the managed API.

Dim aDoc As Document = Application.DocumentManager.MdiActiveDocument Dim ed As Editor = aDoc.Editor Dim opt As New PromptPointOptions(vbCrLf & "Select Part Origin: ") Dim res As PromptPointResult = ed.GetPoint(opt) If res.Status <> PromptStatus.OK Then Exit Sub Dim selPoint As Point3d = res.Value

After selecting the point you can check the 'status' of the PromptPointResult. If the status is okay you can then get the point using the result value.

Re: Error when escaping GetPoint

norman.yuan — Thu, 16 Mar 2023 15:37:45 GMT

Addition to what @hippe013 said:

It is what the COM API was designed: press ESC with AcadUtility.GetXxxxx() method raises exception. It is your responsibility to handle it. So, yes, you need to "Try...Catch..." it. If you are doing .NET API add-in, then there is no reason to use this COM API method at all.