Unable to get access to the GM object in the Firefox debugger console.
// ==UserScript==
// #name test_script
// #version 1
// #grant none
// #include *
// ==/UserScript==
document.GM = GM; // The GM object can not be accessed using document.GM in the developer console
console.log(GM): // This works and the GM object contains GM.info object as expected
Related
I seek to manipulate the XMLHttpRequest done by a website using Greasemonkey (version 4.9 installed). Interception should be simple (How can I intercept XMLHttpRequests from a Greasemonkey script?) but does not work for me. Maybe things changed with newer versions of Greasemonkey?
I obviously tried the examples in the linked question, but they don't have any effect - nothing printed in the console although I have an console.log(...) in my customised open function.
Next, I gave unsafeWindow a try. It should not be needed. My userscript runs with #grant none and documentation (see here) says my script should run in the content scope.
With unsafeWindow I get an effect but it breaks XMLHttpRequest completely
// ==UserScript==
// #name Test
// #version 1
// #include *
// #run-at document-start
// #grant none
// ==/UserScript==
"use strict";
let realOpen = unsafeWindow.XMLHttpRequest.prototype.open
console.log("Real: " + realOpen)
unsafeWindow.XMLHttpRequest.prototype.open = function() {
console.log("Called for " + this + " with URL: " + arguments[0])
//call original
return realOpen.apply(this, arguments)
};
window.addEventListener ("load", function() {
console.log ("Page loaded");
});
console.log("Unsafe: ", unsafeWindow.XMLHttpRequest.prototype.open.toString())
console.log("Normal: ", XMLHttpRequest.prototype.open.toString())
This gives following output in console:
Real: function open() {
[native code]
}
Unsafe: function() {
console.log("Called for " + this + " with URL: " + arguments[0])
//call original
return realOpen.apply(this, arguments)
}
Normal: function open(method, url) {
// only include method and url parameters so the function length is set properly
if (arguments.length >= 2) {
let newUrl = new URL(arguments[1], document.location.href);
arguments[1] = newUrl.toString();
}
return origOpen.apply(this, arguments);
}
==> Page loaded
As mentioned, function of XMLHttpRequest is broken. When I use the Firefox developer console to have a further look I get this
>> window.XMLHttpRequest.prototype.open
Restricted { }
Any properties set on window (like window.foobar = "foobar") do not exist in console, but those set on unsafeWindow do. I assume this has to do with Greasemonkey's sandboxing.
Why are there two versions of XMLHttpRequest even when I use #grant none? Why is my custom function restricted? Can I avoid that? Why does it work without problems when I install event listener on window?
Next, I gave unsafeWindow a try. It should not be needed. My userscript runs with #grant none and documentation (see here) says my script should run in the content scope.
This is wrong for Greasemonkey 4 as stated in its announcement:
Due to the more limited abilities that the new extension system gives us, we are currently unable to make #grant none scripts work in the same way. Most importantly, they have a different connection to unsafeWindow. For the short term at least, it's a good idea to adopt cloneInto and exportFunction.
See also this other question Firefox doesn't respect Object.defineProperty() from a Greasemonkey script?
This change explain the observations, but no idea why adding listener to window work.
I'm trying to create a video recorder in a nativescript plugin on the ios side which means that I am using the native Objective C Classes inside of the plugin to have a shared interface in the nativescript app with the android implementation.
I have the camera view loaded and I am trying to get access to the video frames from the AVCaptureSession. I created an object that implements the protocol to get the frames and for the first second the function captureOutput which has a parameter DidOutputSampleBuffer outputs the frames. But from then on all the frames are dropped and I do not know why. I can view that they are dropped because the function in the protocol, captureOutput with parameter DidDropSampleBuffer runs for every frame.
I tried changing the order of intializion for the avcapturesession but that didn't change anything.
Below is the main function with the main code to create the capture session and capture object. While this is typescript nativescript allows you to call native Objective C functions and classes so the logic is the same in objective c. I also create a VideoDelegate object in nativescript which corresponds to a class in Objective C which allows me to implement the protocol to get the video frames from the capture device output.
this._captureSession = AVCaptureSession.new();
//Get the camera
this._captureSession.sessionPreset = AVCaptureSessionPreset640x480;
let inputDevice = null;
this._cameraDevice = AVCaptureDevice.defaultDeviceWithMediaType(AVMediaTypeVideo);
//Get the camera input
let error: NSError = null;
this._captureInput = AVCaptureDeviceInput.deviceInputWithDeviceError(this._cameraDevice);
if(this._captureSession.canAddInput(this._captureInput)){
this._captureSession.addInput(this._captureInput);
}
else{
console.log("couldn't add input");
}
let self = this;
const VideoDelegate = (NSObject as any).extend({
captureOutputDidOutputSampleBufferFromConnection(captureOutput: any,sampleBuffer: any, connection:any): void {
console.log("Captureing Frames");
if(self.startRecording){
self._mp4Writer.appendVideoSample(sampleBuffer);
console.log("Appending Video Samples");
}
},
captureOutputDidDropSampleBufferFromConnection(captureOutput: any,sampleBuffer: any, connection:any): void {
console.log("Dropping Frames");
},
videoCameraStarted(date){
// console.log("CAMERA STARTED");
}
}, {
protocols: [AVCaptureVideoDataOutputSampleBufferDelegate]
});
this._videoDelegate = VideoDelegate.new();
//setting up camera output for frames
this._captureOutput = AVCaptureVideoDataOutput.new();
this._captureQueue = dispatch_queue_create("capture Queue", null);
this._captureOutput.setSampleBufferDelegateQueue(this._videoDelegate,this._captureQueue);
this._captureOutput.alwaysDiscardsLateVideoFrames = false;
this._framePixelFormat = NSNumber.numberWithInt(kCVPixelFormatType_32BGRA);
this._captureOutput.videoSettings = NSDictionary.dictionaryWithObjectForKey(this._framePixelFormat,kCVPixelBufferPixelFormatTypeKey);
this._captureSession.addOutput(this._captureOutput);
this._captureSession.startRunning();
So I've been learning C++ and I've been trying to learn some SFML 2 via some videos. At first I had no real issues, I was using MS VS2012 and everything was fine. I start using MS VS2015 Community and it all starts going wrong and I've got no idea why!
Main problem:
Everything compiles, but it just crashes when I try to use sf::RenderWindow::createWindow()
Error Message:
I get the message "SFML_Project.exe is no longer working",
I go to debug it and it gives me the following message:
Unhandled exception thrown: read access violation.
this->_Ptr was 0xCCCCCCCC.
If there is a handler for this exception, the program may be safely continued.
and it does it on this function (some SFML code I know nothing about)
const facet *_Getfacet(size_t _Id) const
{ // look up a facet in locale object
const facet *_Facptr = _Id < _Ptr->_Facetcount
? _Ptr->_Facetvec[_Id] : 0; // null if id off end <- ON THIS LINE OF CODE IT BREAKS
if (_Facptr != 0 || !_Ptr->_Xparent)
return (_Facptr); // found facet or not transparent
else
{ // look in current locale
locale::_Locimp *_Ptr = _Getgloballocale();
return (_Id < _Ptr->_Facetcount
? _Ptr->_Facetvec[_Id] // get from current locale
: 0); // no entry in current locale
}
}
Line of info that was given at the Call Stack
sfml-system-d-2.dll!std::locale::_Getfacet(unsigned int _Id) Line 451 C++
My Code:
#include <iostream>
#include "SFML\Graphics.hpp"
int main()
{
sf::RenderWindow window;
window.create(sf::VideoMode(800, 800), "WindowName");
sf::Texture texture;
sf::Sprite sprite;
texture.loadFromFile("Player.png");
sprite.setTexture(texture);
sf::Event eventHandler;
while(window.isOpen())
{
while(window.pollEvent(eventHandler))
{
switch(eventHandler.type)
{
case sf::Event::Closed:
window.close();
break;
}
}
window.clear();
window.draw(sprite);
window.display();
}
}
SFML version: Visual C++ 14 (2015) - 32-bit
Project Properties:
Debug -> C/C++ -> General -> Additional Include Directories:
$(SolutionDir)/SFML-2.3.2/include
Debug -> Linker -> General -> Additional Library Directories:
$(SolutionDir)/SFML-2.3.2/lib
Debug -> Linker -> Input -> Additional Dependencies:
sfml-main-d.lib
sfml-window-d.lib
sfml-graphics-d.lib
sfml-system-d.lib
sfml-network-d.lib
sfml-audio-d.lib
What I've tried:
I've tried turning all the dependencies from sfml-XX-d.lib to sfml-XX.lib files, which does allow me to create a window and draw shapes to that window, but then when I try to use sf::Texture::loadFromFile("filename") the console command window turns into the matrix and starts beeping.
It might be because you link the window lib before the graphics lib.
Try to move up the window lib under the graphics lib.
sfml-graphics-d.lib
sfml-window-d.lib
sfml-system-d.lib
If it's still crashing, it may because your sfml's dlls does not match the current sfml version that you have. Happened to me once, I downloaded a new version of sfml without updating the binaries.
I am trying to run a sample code from the OpenNI 1.5 documentation.I have imported the library required XnCppWrapper.h so that I can use C++.The code has only one error on a particular variable "bshouldrun".I know that it should be declared as something but since I am new at this and the documentation does not contain anything above the main, I dont know what to declare it as..Please help!!
And thanks in advance.
#include <XnOpenNI.h>
#include <XnCppWrapper.h>
#include <stdio.h>
int main()
{
XnStatus nRetVal = XN_STATUS_OK;
xn::Context context;
// Initialize context object
nRetVal = context.Init();
// TODO: check error code
// Create a DepthGenerator node
xn::DepthGenerator depth;
nRetVal = depth.Create(context);
// TODO: check error code
// Make it start generating data
nRetVal = context.StartGeneratingAll();
// TODO: check error code
// Main loop
while (bShouldRun) //<-----------------------------**ERROR;bShouldRun Undefined**
{
// Wait for new data to be available
nRetVal = context.WaitOneUpdateAll(depth);
if (nRetVal != XN_STATUS_OK)
{
printf("Failed updating data: %s\n", xnGetStatusString(nRetVal));
continue;
}
// Take current depth map
const XnDepthPixel* pDepthMap = depth.GetDepthMap();
// TODO: process depth map
}
// Clean-up
context.Shutdown();
}
Here's what I did to run a sample from Visual Studio 2010 Express on Windows (8):
Opened the NiSimpleViewer.vcxproj VS2010 project from C:\Program Files (x86)\OpenNI\Samples\NiSimpleViewer
Edited OpenNI.rc to comment out #include "afxres.h" on line 10(might be missing this because I'm using Express version, not sure. Your machine might compile this fine/not complain about the missing header file)
Enabled Tools > Options > Debugging > Symbols > Microsoft Symbol Servers (to get past missing pdb files issue)
Optionally edit the SAMPLE_XML_PATH to "SamplesConfig.xml" rather than the default "../../../Data/SamplesConfig.xml", otherwise you need to run the sample executable from ..\Bin\Debug\NiSimpleViewer.exe by navigating to there rather than using the Ctrl+F5. A;so copy the SamplesConfig.xml file into your sample folder as you can see bellow
Here are a few images to illustrate some of the above steps:
You can also compile the NiHandTracker sample, which sounds closer to what you need.
So this explains the setup for OpenNI 1.5 which is what your question is about.
I've noticed your OpenNI 2 lib issue in the comments. It should be a matter of linking against SimpleHandTracker.lib which you can do via Project Properties (right-click project->select Properties) > Linker > Input > Additional Dependencies > Edit.
I don't have OpenNI2 setup on this machine, but assuming SimpleHandTracker.lib would be in OpenNI_INSTALL_FOLDER\Lib. Try a file search in case I might be wrong.
I am trying to write some code that interacts with an USB device in Objective C, and I got stuck on setting the callback function for incoming reports. In my case it's an IOKIT function but I think the problem is more general as I (apparently) don't know how to correctly set a C callback function in Objective-C. I've got a Class "USBController" that handles the io functions
USBController.m:
#include <CoreFoundation/CoreFoundation.h>
#include <Carbon/Carbon.h>
#include <IOKit/hid/IOHIDLib.h>
#import "USBController.h"
static void Handle_IOHIDDeviceIOHIDReportCallback(
void * inContext, // context from IOHIDDeviceRegisterInputReportCallback
IOReturn inResult, // completion result for the input report operation
void * inSender, // IOHIDDeviceRef of the device this report is from
IOHIDReportType inType, // the report type
uint32_t inReportID, // the report ID
uint8_t * inReport, // pointer to the report data
CFIndex InReportLength) // the actual size of the input report
{
printf("hello"); //just to see if the function is called
}
#implementation USBController
- (void)ConnectToDevice {
...
IOHIDDeviceRegisterInputReportCallback(tIOHIDDeviceRefs[0], report, reportSize,
Handle_IOHIDDeviceIOHIDReportCallback,(void*)self);
...
}
...
#end
All the functions are also declared in the header file.
I think I did pretty much the same as what I've found here, but it doesn't work. The project compiles nicely and everything works up till the moment there is input and the callback function is to be called. Then I get an "EXC_BAD_ACCESS" error. The first three arguments of the function are correct. I'm not so sure about the context..
What did I do wrong?
I am not sure at all that your EXEC_BAD_ACCESS depends on your callback. Indeed, if you say that it is called (I suppose you see the log) and since it only logs a message, there should be no problem with this.
EXEC_BAD_ACCESS is caused by an attempt to access an already deallocated object. You can get more information in two ways:
execute the program in debug mode, so when it crashes you will be able to see the stack content;
activate NSZombies or run the program using the performance tool Zombies; this will tell you exactly which object was accessed after its deallocation.
I know how to fix this. When calling this:
IOHIDDeviceRegisterInputReportCallback(tIOHIDDeviceRefs[0], report, reportSize,
Handle_IOHIDDeviceIOHIDReportCallback,(void*)self);
You don't include the code for the creation/type of the value called report. However the method name "Handle_IOHIDDeviceIOHIDReportCallback" comes from an Apple document where there is an error in the creation of the report value. https://developer.apple.com/library/archive/technotes/tn2187/_index.html
CFIndex reportSize = 64;
uint8_t report = malloc( reportSize ); // <---- WRONG
IOHIDDeviceRegisterInputReportCallback( deviceRef,
report,
reportSize,
Handle_IOHIDDeviceIOHIDReportCallback,
context );
Instead do this:
uint8_t *report = (uint8_t *)malloc(reportSize);