Sunday, August 21, 2011

Click on Element within a Frame using AHK

The syntax is tricky and threw me off this project for months. I finally have cleared it up, and here it is for posterity:

The syntax for plain javascript, executable from internet explorer DebugBar v5.4.1 is:
document.parentWindow.actualframename.document.getElementByID("actualID").click()

In distinction, the syntax for AHK COM SCRIPTS is:
COM_Invoke(pwb, "document.parentWindow.actualframename.document.getElementByID[actualID].click")

NOTICE (I usually don't shout, but in this case I will make an exception): THE ARGUMENT OF getElementById IN JAVASCRIPT IS ENCLOSED IN PARENTHESES AND QUOTES. THE SAME ARGUMENT IN AHK IS ENCLOSED INSTEAD IN BRACKETS AND NO QUOTES. ALSO THE METHOD IN JAVASCRIPT HAS PARENTHESES AFTER IT click() WHEREAS IN AHK IT DOES NOT click (THE REASON FOR THESE DIFFERENCES IS THE AHK COM_Invoke FUNCTION, WHICH REQUIRES ARGUMENTS CONTAINED IN PARENTHESES AND QUOTES.)

Also it is worth saying what is the quickest way to find the actual frame name (yes it is the name, not the ID) and the actual element ID (yes ID, not the name). Answer: A magnificent AHK script called iWebBrowser2 Learner Build 2.5, by "Tank, Jethrow, and Sinkfaze" of the AHK forum. Just hover over the element until it has a red box around it, and read the answer in the dialog box.

More info can be found at these forum posts: (primer on COM functions, and link to the all-important GetWebBrowser() function the COM functions depend on)
http://www.autohotkey.com/forum/topic51020.html
http://www.autohotkey.com/forum/topic24930.html

Thank you Sean, Tank, Jethrow, and Sinkfaze, whoever you are.

Saturday, January 8, 2011

Transparent Images for FPDF

This post is really to help me remember the layers of FPDF class extensions I am using.
Remember that FPDF is a class defined in the fpdf.php file and contains many useful functions for manipulating pdf files. These functions can be called by the syntax

$pdfobject->function();

class FPDF_TPL extends FPDF
class FPDI extends FPDF_TPL
class AlphaPDF extends FPDI

The AlphaPDF class (alphapdf.php) is a small script courtesy of Martin Hall-May and is found at
http://www.fpdf.de/downloads/addons/74/
It was originally written as an extension of FPDF but I modified it to be an extension of FPDI so that my pdfobject can call functions both for purposes of importing PDF images, and superimposing gif images using the marvelous SetAlpha() function, as described below

// alpha: real value from 0 (transparent) to 1 (opaque)
// bm: blend mode, one of the following:
// Normal, Multiply, Screen, Overlay, Darken, Lighten, ColorDodge, ColorBurn,
// HardLight, SoftLight, Difference, Exclusion, Hue, Saturation, Color, Luminosity
function SetAlpha($alpha, $bm='Normal')

Thursday, January 6, 2011

More on using MacBook Pro (Snow Leopard) as a Server

You can actually turn a MBP into a WiFi hot spot with the built-in software. Here's the trick:
System Preferences -> Sharing -> Internet Sharing checkbox -> Share your connection from Ethernet
You see AirPort pop up as an option. Click it and click on Airport Options and VIOLA you can configure your MBP to be a router!
You can create a network name, a password, and select level of encryptation. Remember to activate the Internet Sharing checkbox again at the end to "start" the WiFi hotspot.

This was designed to allow you to pipe your ethernet broadband internet connection wirelessly to other devices in the neighborhood, the great thing is even if you do NOT have the ethernet port connected to anything, it will still broadcast a WiFi signal and you can use the local computer name (name.local:8888) to browse to the MAMP server in the MBP.

Why would anyone want to do this? The answer is sometimes you want to browse to the server on a handheld device, even when you are not connected to a local WiFi hotspot. One way is to leave the server behind, at a hotspot, and browse to it using 3G, using methods described previously. But NOW, even if you have a WiFi ONLY device such as an iPod or iPad that doesn't have 3G, if you bring the server with you, you can still run your server scripts on the handheld.

The only problem being: even with the MBP lid closed? The answer is yup, but you have to run a free software called InsomniaX to keep the MBP running even with the lid closed.

Remember, Airport can only go one way at a time. You gotta turn off Internet Sharing to restore Airport to a receiver (instead of a transmitter) once you use it. Crazy.