QtScript 4 VB

Author: Dave
Date: 07.11.15 - 8:20am

on the continued quest to have an embeddable JavaScript engine with integrated debugger that I can use in my VB6 apps for automation tasks, I have started experimenting with yet another engine.

This one comes from the QT 4.8 framework in the form of QTScript.

source repository for my experiments is here

note that you must use the 4.8 branch, in the 5.x branch they have switched over to using v8, and do not appear to have the debugger protocol wired in. Many people complained of this. My personal preference is to use a little bit older libraries and development tools anyway so this is fine for my task.

(I won't start on a rant here, but I prefer to use software from the pre-bloatware era such as vb6, VS2008, photoshop 7 etc.. I don't need a billion features and pretty interfaces... I want fast responsive native applications with a minimal runtime overhead whose main goal is function and usability, not prettiness. I also refuse to be sucked in by trends with no staying power which result in wasted time like wpf, windows phone development, silverlight, etc..)

anyway not to get sidetracked, so the QT script framework has a complete debugger interface already built-in that you can utilize in only a few lines of code.

With a few more lines of code you can wrap this in a DLL and utilize it from Visual Basic six. the mechanism that I designed for the duktape JavaScript engine to access VB6 form elements and general COM objects is also easily applied to this script engine. The runtime requirements are a little heavy. A release build of the required DLLs will weigh in at a pretty hefty 12 MB. so that is a cost, however it takes very little code in order to access all of these advanced features.

There also looks to be a way to add some similar capabilities using the QScriptEngineAgent class which I believe will only require 2mb dependancies (but with having to implement a UI on your own)

Also the QT library has many many users, and there are many help answers available on the net already. Duktape on the other hand has pretty sparse information available as of yet in the help forums or mailing lists. one other aspect you would have to consider if evaluating QT-based components is that your project would either have to be licensed as GPL, or purchase a commercial license for the library.

One other plus is that the QT library seems to be extremely well written, easy to use, and open source.

I made a quick video discussing the design and showing some of the features:

Comments: (1)

On 07.13.15 - 9:08am Dave wrote:
btw if you have the problem of intellisense not working:


I finally found it, you need to add $(QTDIR)\src to your Tools->Options->Projects and Solutions->VC++ Directories->Source files.

Leave Comment:
Email: (not shown)
Message: (Required)
Math Question: 82 + 6 = ? followed by the letter: S 

About Me
More Blogs
Main Site
Console tricks
FireFox temp dir
OCX License
Extract substring
VB6 Console Apps
VB6 Debugger View As Hex tooltips
VB6 - C Share registry data
VB6 Addin Missing Menus
VB6 Class Init Params
VB6 isIn function
Python and VB6
Python pros and cons
download web Dir
vc rand in python
VB6 Language Enhancement
Register .NET as COM
UDT Tricks pt2
Remote Data Extraction
Collection Extender
VB6 FindResource
DirList Single Click
Reset CheckPoint VPN Policy
VB6 BSTR Oddities Explained
SafeArrays in C
BSTR and Variant in C++
Property let optional args
Misc Libs
Enum Named Pipes
Vb6 Collection in C++
VB6 Overloaded Methods
VB6 Syncronous Socket
Simple IPC
VB6 Auto Resize Form Elements
Mach3 Automation
Exit For in While
C# self register ocx
VB6 Class Method Pointers
JS Debugger
Duktape Debug Protocol
QtScript 4 VB
Vb6 Named Args
vb6 Addin Part 2
VB6 Addin vrs Toolbars
OpenFile Dialog MultiSelect
Duktape Example
DukTape JS
VB6 Unsigned
.Net version
TitleBar Height
.NET again
VB6 Self Register OCXs
Query Last 12 Mos
Progid from Interface ID
VB6 to C Array Examples
Human Readable Variant Type
ScriptBasic COM Integration
CodeView Addin
ScriptBasic - Part 2
Script Env
printf override
History Combo
Disable IE
API Hooking in VB6
Addin Hook Events
FastBuild Addin
VB6 MemoryWindow
Link C Obj Files into VB6
Vb6 Standard Dlls
CStr for Pascal
Lazarus Review
asprintf for VS
VB6 GlobalMultiUse
Scintilla in VB6
Dynamic Highlight
WinVerifyTrust, CryptMsgGetParam VB6
MS GLEE Graphing
printf for VB6
C# App Config
Tero DES C# Test
VC 2008 Bit Fields
Speed trap
C# Db Class Generator
VB6 vrs .NET (again)
FireFox Whois Extension
git and vb6
Code Additions
Compiled date to string
C# ListView Sorter
VB6 Wish List
C# Process Injection
C# PE Offset Calculator
VB6 Async Download
Show Desktop
coding philosophy
Code release
Dll Not Found in IDE
Advanced MSScript Control
random tip
Clipart / Vector Art
VB6 Callback from C#
Binary data from VB6 to C#
CSharp and MsScriptControl
HexDumper functions
Js Beautify From VB6 or C#
vb6 FormPos
Inline Asm w VB6
The .NET Fiasco
One rub on computers
Universal extractor