_ff-addon-snippet-ObjC_SetApplicationIconImage - Change the icon in the dock. (Mac OS X) (js-ctypes)

_ff-addon-snippet-ObjC_SetApplicationIconImage.js

"use strict";

let { utils: Cu } = Components;
let { ctypes } = Cu.import("resource://gre/modules/ctypes.jsm", {});
let { OS } = Cu.import("resource://gre/modules/osfile.jsm", {});

/* **** please replace following string before run **** */
let IMAGE_PATH = "absolute path to image file";

OS.File.read(IMAGE_PATH).then(function(iconData) {
  // NOTE: iconData is Uint8Array
  let length = ctypes.unsigned_long(iconData.length);
  let bytes = ctypes.uint8_t.array()(iconData);

  let objc = ctypes.open(ctypes.libraryName("objc"));

  let id = ctypes.voidptr_t;
  let SEL = ctypes.voidptr_t;
  let objc_getClass = objc.declare("objc_getClass",
                                   ctypes.default_abi,
                                   id,
                                   ctypes.char.ptr);
  let sel_registerName = objc.declare("sel_registerName",
                                      ctypes.default_abi,
                                      SEL,
                                      ctypes.char.ptr);
  let objc_msgSend = objc.declare("objc_msgSend",
                                  ctypes.default_abi,
                                  id,
                                  id,
                                  SEL,
                                  "...");

  // NSApp = [NSApplication sharedApplication];
  let NSApplication = objc_getClass("NSApplication");
  let sharedApplication = sel_registerName("sharedApplication");
  let NSApp = objc_msgSend(NSApplication, sharedApplication);

  // data = [NSData dataWithBytes: bytes length: length];
  let NSData = objc_getClass("NSData");
  let dataWithBytes_length = sel_registerName("dataWithBytes:length:");
  let data = objc_msgSend(NSData, dataWithBytes_length, bytes, length);

  // icon = [[NSImage alloc] initWithData: data];
  let NSImage = objc_getClass("NSImage");
  let initWithData = sel_registerName("initWithData:");
  let alloc = sel_registerName("alloc");
  let icon = objc_msgSend(objc_msgSend(NSImage, alloc), initWithData, data);

  if (icon.isNull()) {
    throw new Error("Image file is corrupted.");
  }

  // [NSApp setApplicationIconImage: icon]
  let setApplicationIconImage = sel_registerName("setApplicationIconImage:");
  objc_msgSend(NSApp, setApplicationIconImage, icon);

  // [icon release]
  let release = sel_registerName("release");
  objc_msgSend(icon, release);

  objc.close();
}, function(e) {
  console.log("Failed to read from file:", e);
}).catch(function(e) {
  console.log(e);
});

README

See Also GitHubGIST :: Noitidart / _ff-addon-snippet-ObjC_SwizzleWithSetImplementation.js

See Also GitHubGIST :: Noitidart / _ff-addon-snippet-ObjC_SwizzleWithExchangeImplementation.js

Rev1

• Code from @arai-a (so cooool!) from here: http://www.unmht.org/forum/en/4774.html

• Works! :)

• To reset applied image send with nil per documentation

  • AppleDocs: https://developer.apple.com/library/mac/documentation/Carbon/Conceptual/customizing_docktile/docktasks_cocoa/docktasks_cocoa.html#//apple_ref/doc/uid/TP30000986-CH3-SW2

    To restore your application’s original icon, you call setApplicationIconImage: with a nil parameter:

    [NSApp setApplicationIconImage: nil];
    

    • So do objc_msgSend(NSApp, setApplicationIconImage, ctypes.voidptr_t(0)) instead of objc_msgSend(NSApp, setApplicationIconImage, icon)

• Image path can be to png or icns, it shows in alt + tab menu, only place the applied image doesn't show is if you minimize a window see red arrow in image, red arrow pointing to where icon is not showing, this image shows the icon is set in alt+tab menu and dock which is awesome:
  

• Also the image in the prompt dialogs is not changed by setApplicationIconImage, this is fixed though by swizzling [[NSImage imageNamed] @'NSApplication'], here is image of icon in dialog:

  

  • This swizzle also fixes the drawIcon for Firefox when download progress bar is shown on dock icon

Rev2

• Added "ObjC" to file/gist name and description