From my personal wonders it seems that Delphi and VBScript are the two most popular (Delphi being the one most of Altium’s own examples are written in, and VBScript being the one that many 3rd parties have used). My personal favourite is VBScript, due to it’s simplicity (while not lacking any power).
Where To Download Scripts From
Lots of third-party scripts can be downloaded from the Google Code Project, found here.
Unfortunately, the original scripts that used to be included with Altium disappeared from Altium Designer 10. I’ve uploaded a zip of all these scripts that can be downloaded here.
Also, I have a project called AltiumScriptCentral which can be downloaded from GitHub. It has a collection of useful scripts for increasing productivity and validating PCBs before being sent of for manufacturing. They are all written in VBScript, and can be used as code examples to write your own.
How To Write Your Own Scripts
Below are tips and code examples to write your own Altium scripts. I prefer VBScript (which to me personally was one of the easiest to grasp coming from a C/C++/C# background, and seems to be one of the widely supported languages), however most are written in Delphi Script.
A word of caution, when writing/testing scripts (and running downloaded scripts for the first time), always test them on a non-valuable PCB project (or similar) incase the script does not work as expected! Buggy/rouge scripts can cause Altium to lock-up/crash, stop the undo from working (until you restart Altium), stop you from being able to save from that point onwards (again until you restart Altium), among other things! You do not want to lose your precious work!
More than likely, you will need to use the internet to get familiar with the scripting language of choice. Remember, if using VBScript, make sure you search for VBScript tutorials, not just “Visual Basic”, as you will more than likely get the wrong language and you code won’t work (VBScript is different to Visual Basic).
quits the current script and returns the user back to Altium.
You can use the function
ShowMessage() to display to the user a message box with simple text. An example in Delphi:
procedure HelloWorldExample(); begin ShowMessage('Hello, world.'); end;
This will display a message box with the text “Hello, world.”. Note that in Delphi, strings are delimited with single quotations (
'), not double quotations (
This is the equivalent in VBScript:
The Hello World Example
In Altium, click File->New->Script Files->VB Script Unit. Altium should open a new, blank script file. Then type in the following code:
Save the script file. Now run the script file by clicking DXP->Run Script and then selecting the HelloWorld function (which should be listed underneath the filename of the script, see the below image). When run in Altium, this code should display a message box with the text “Hello, world!”.
The Delphi equivalent is shown below:
procedure HelloWorldExample(); begin ShowMessage('Hello, world!'); end;
Notice the differences between the two languages, VBScript requires only an end identifier but Delphi requires both a begin and end identifier. VBScript delimits strings with the
" character, while Delphi uses the
Looping indefinitely (e.g. while true then…) WILL lock up Altium, forcing you to forcibly close it, and loosing all un-saved work. All make sure to save your work before running scripts!
Conversion From A String
Altium provides a set of functions for converting strings to other data types. These include functions like StrToFloat().
However, I recommend that you do not use these, but use the built-in ones of the scripting language of your choice. Why? Because the built-in ones have better support when used with other functions.
For example, if using VBScript, the
CDbl() function converts all numbers that pass the
IsNumeric() test, while the Altium-provided
StrToFloat() will fail on things like
"2-" (which passes
IsNumeric()), and throws an exception, potentially crashing your application.
Before we get too serious, here are some best practices (stipulated by no-one except myself).
These apply if you are VBScript:
Always add the line Option Explicit to every script file. This forces you to define all variables with Dim before using them, which results in far fewer bugs!
Add a header to the top of every script file telling you and anyone else what it does. You consider yourself to be a good programmer, right? Here is an example (this is what I use):
1 2 3 4 5 6 7 8
' ' @file Main.vbs ' @author Geoffrey Hunter <email@example.com> (blog.mbedded.ninja) ' @created 2013-08-08 ' @last-modified 2015-01-08 ' @brief Main entry point for AltiumScriptCentral. ' @details ' See README.rst in repo root dir for more info.
Be consistent with your naming conventions.
This sections covers code non-specific to either the schematics or PCB.
Obtaining The Current Project
Projects are represented as
IProject objects. To get the currently active project, you can use the
DM_FocusedProject function on an
IWorkspace object, as shown in the following Delphi example:
Informing Altium That You’ve Changed Things
Everytime you modify something with an Altium script, you should inform Altium that you have done so, so that things like undo/redo work correctly and Altium knows that the file needs saving. This is done through the
RobotManager.SendMessage() procedure, which is a member of both the
The following code examples show the
RobotManager being used for schematic operations.
I have experienced issues with calling
RobotManager.SendMessage() before, resulting it taking a long time (about 2s per call), displaying the infamous “Please wait a moment” dialogue box, and not seeming to have any effect. I am not sure what caused this, as this procedure is used in many scripts available on the web.
It won’t be long before you’ll end up doing something like trigonometry in Altium scripts to work out the placement of objects onto a PCB. This kind of thing is not really dependent on Altium but more on the provided mathematics libraries that come with the scripting language you are using.
Check out the VBScript page to find out how to use the
cos() family of functions, how to get a value for Pi, and more! All these are applicable to Altium scripts.
Usually, if you do something that throws an exception, the script will halt at the line which threw the exception, and you can probe the in-scope variables to find their values and other useful debugging information.
However, in my experience, you run into problems if you close the first (main) script form, and then an exception is thrown. You get an “unhandled exception” error, and you can’t debug the code at the current stop point. To prevent this, I make sure I never close the main form, but instead resize it to the smallest area possible before loading up a child form.
You get into some nasty situations where Altium will “lock-up”, if an unhandled exception is thrown and there are forms hidden but still active.
The schematic server (SchServer) is the root object for all script usage within schematics.
Getting The Current Schematic
Two of the most common ways to get an object to the current schematic is to use either
SCHServer.GetSchDocumentByPath(), as shown in the examples below.
Looping Through All Schematics In A Project
This example shows how you can safely loop through all schematics in a project. Put code to run on each schematic where shown. Note that the project must be compiled for this to work! Otherwise the iterator may only get some or none of the schematic documents. This is because
SchServer.GetSchDocumentByPath() only retrieves open documents. Compiling a project loads the documents into memory, which counts as being ‘open’, even though you may not be able to see the schematic tab.
GetSchDocumentByPath() function requires the full path to the schematic to be passed into it. This can be obtained by using an
IDocument object which in turn is obtained with an
Compiling The Project
Compiling the project can be done programmatically and is necessary precursor for a number of other scripts to work (e.g. iterating through all the schematics in the project, they cannot be found until the project is compiled). This code example assumes you already have retrieved the IProject interface object from the workspace interface
// Compile project flatHierarchy := PCBProject.DM_DocumentFlattened; // If we couldn't get the flattened sheet, then most likely the project has // not been compiled recently if (flatHierarchy = Nil) Then begin // First try compiling the project ResetParameters; AddStringParameter('Action', 'Compile'); AddStringParameter('ObjectKind', 'Project'); RunProcess('WorkspaceManager:Compile'); // Try Again to open the flattened document flatHierarchy := PCBProject.DM_DocumentFlattened; if (flatHierarchy = nil) then begin ShowMessage('ERROR: Compile the project before running this script.'); exit; end; // If (flattenedDoc = Nil) Then end;
Refreshing The Schematic
Use the following command to refresh the screen:
Press Ctrl-Space to bring up the auto-complete help at any time. This is very useful when writing scripts for Altium, and results in you having to do a lot less of searching through code reference guides!
Special strings are text strings which get converted when presenting certain output. The following special strings are available:
.PRINT_DATE .PRINT_TIME .PRINT_SCALE .LAYER_NAME .PCB_FILE_NAME .PCB_FILE_NAME_NO_PATH .PLOT_FILE_NAME .ARC_COUNT .COMPONENT_COUNT .FILL_COUNT .HOLE_COUNT .NET_COUNT .PAD_COUNT .STRING_COUNT .TRACK_COUNT .VIA_COUNT .DESIGNATOR .COMMENT .LEGEND .NET_NAMES_ON_LAYER
Special strings are the reason why most objects are provided with two string properties,
UnderlyingString contains the raw text of a string, while
ConvertedString contains the text once all special strings have been converted into the appropriate output.
If using VBScript, you can easily use the built-in regex engine to use regex with Altium scripts.
The Altium scripting language lets you design graphical user interfaces (GUIs) for your scripts. Each script file has the option of having an associated form which can be displayed from a function call.
The TForm object is the main window, the parent UI object which holds all of the other UI objects for the window inside it.
You can resize a TForm object programmatically using the Height and Width parameters. The script file Main.vbs in the AltiumScriptCentral project uses these parameters often to “hide” the main window when a child window is opened (without actually hiding it, which causes other issues). Here is an example which resizes the main form before calling a child script:
Note that there is a minimum window size to Altium script forms which keeps the minimise, maximise and close buttons just visible. Setting the
Width parameters to values below this minimum threshold has no effect.
TRadioGroup controls are useful for when you have multiple “sets” of radio buttons on one UI. They allow multiple radio buttons to be selected (from different groups of course), without all other on the UI being deselected.
Individual radio buttons are added to a radio group through the Items property, in where you add a new radio button on a new line.
The selected radio button in a group is controlled via the TRadioGroups ItemIndex property. This property can the read or written. This property corresponds to the line number of the corresponding radio button entry in the Items property (0-based count).
The DeleteSchematicParameters,vbs script in the AltiumScriptCentral project makes use of the TRadioGroup control.
A Command Is Currently Active, Cannot Save
You can get the following error when trying to save if you haven’t called PCBServer.PostProcess an equal number of times as PCBServer.PostProcess. So far, if this does occur, I haven’t worked out how to save the document (all changes since the last save are lost!).
See the Undo section for information.
Access Violation When Using Some Of The Arc’s Properties
When trying to define a arc using any of
EndY causes an access violation within
AltiumComponents.bpl. A workaround to this is to define the arc using the centre, radius, and start/stop angle parameters.
Variables Not Being Syntax Highlighted
The syntax highlighting in the code editor doesn’t highlight variables in some cases. It seems to happen after you copy and paste bits of code around and the syntax highlighter algorithm gets confused about what’s a variable and what’s not. If you define more than one variable in a single statement, e.g.
var track1, track2 : IPCB_Track; begin ...
track1 will be coloured as a variable, while
track2 will look like normal text. Normally closing and re-opening the file you are editing in Altium will fix this.
Some PCB OBjects Properties Cannot Be Set Directly, Even Though They Are Visable Through The AutoComplete Menu
For example. you cannot set a pads soldermask and pastemask expansion values (useful if you want to remove them all together) using the properties
pad.PasteMaskExpansion. The only way I have found to do this is to create a pad cache, set the expansion values for the cache, and then assign the cache to the pad as per the following example.
Undo Is Not Working Correctly
Make sure that you call
PCBServer.PostProcess correctly! (see the Undo section for more details).
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