I have a barcode reader code was working well with Xcode 6.2 but when you upgraded to Xcode 6.3 I got this error message
Use error message of unresolved identifier 'qrCodeFrameView'
this my code
func captureOutput(captureOutput: AVCaptureOutput!, didOutputMetadataObjects metadataObjects: [AnyObject]!, fromConnection connection: AVCaptureConnection!) {
// Check if the metadataObjects array is not nil and it contains at least one object.
if metadataObjects == nil || metadataObjects.count == 0 {
qrCodeFrameView?.frame = CGRectZero
return
}
// Get the metadata object.
let metadataObj = metadataObjects[0] as! AVMetadataMachineReadableCodeObject
// Here we use filter method to check if the type of metadataObj is supported
// Instead of hardcoding the AVMetadataObjectTypeQRCode, we check if the type
// can be found in the array of supported bar codes.
if supportedBarCodes.filter({ $0 == metadataObj.type }).count > 0 {
// If the found metadata is equal to the QR code metadata then update the status label's text and set the bounds
let barCodeObject = videoPreviewLayer?.transformedMetadataObjectForMetadataObject(metadataObj as AVMetadataMachineReadableCodeObject) as! AVMetadataMachineReadableCodeObject
qrCodeFrameView?.frame = barCodeObject.bounds
if metadataObj.stringValue != nil {
}
Related
I Have the following model
class Process: Object {
#objc dynamic var processID:Int = 1
let steps = List<Step>()
}
class Step: Object {
#objc private dynamic var stepCode: Int = 0
#objc dynamic var stepDateUTC: Date? = nil
var stepType: ProcessStepType {
get {
return ProcessStepType(rawValue: stepCode) ?? .created
}
set {
stepCode = newValue.rawValue
}
}
}
enum ProcessStepType: Int { // to review - real value
case created = 0
case scheduled = 1
case processing = 2
case paused = 3
case finished = 4
}
A process can start, processing , paused , resume (to be in step processing again), pause , resume again,etc. the current step is the one with the latest stepDateUTC
I am trying to get all Processes, having for last step ,a step of stepType processing "processing ", ie. where for the last stepDate, stepCode is 2 .
I came with the following predicate... which doesn't work. Any idea of the right perform to perform such query ?
my best trial is the one. Is it possible to get to this result via one realm query .
let processes = realm.objects(Process.self).filter(NSPredicate(format: "ANY steps.stepCode = 2 AND NOT (ANY steps.stepCode = 4)")
let ongoingprocesses = processes.filter(){$0.steps.sorted(byKeyPath: "stepDateUTC", ascending: false).first!.stepType == .processing}
what I hoped would work
NSPredicate(format: "steps[LAST].stepCode = \(TicketStepType.processing.rawValue)")
I understand [LAST] is not supported by realm (as per the cheatsheet). but is there anyway around I could achieve my goal through a realm query?
There are a few ways to approach this and it doesn't appear the date property is relevant because lists are stored in sequential order (as long as they are not altered), so the last element in the List was added last.
This first piece of code will filter for processes where the last element is 'processing'. I coded this long-handed so the flow is more understandable.
let results = realm.objects(Process.self).filter { p in
let lastIndex = p.steps.count - 1
let step = p.steps[lastIndex]
let type = step.stepType
if type == .processing {
return true
}
return false
}
Note that Realm objects are lazily loaded - which means thousands of objects have a low memory impact. By filtering using Swift, the objects are filtered in memory so the impact is more significant.
The second piece of code is what I would suggest as it makes filtering much simpler, but would require a slight change to the Process model.
class Process: Object {
#objc dynamic var processID:Int = 1
let stepHistory = List<Step>() //RENAMED: the history of the steps
#objc dynamic var name = ""
//ADDED: new property tracks current step
#objc dynamic var current_step = ProcessStepType.created.index
}
My thought here is that the Process model keeps a 'history' of steps that have occurred so far, and then what the current_step is.
I also modified the ProcessStepType enum to make it more filterable friendly.
enum ProcessStepType: Int { // to review - real value
case created = 0
case scheduled = 1
case processing = 2
case paused = 3
case finished = 4
//this is used when filtering
var index: Int {
switch self {
case .created:
return 0
case .scheduled:
return 1
case .processing:
return 2
case .paused:
return 3
case .finished:
return 4
}
}
}
Then to return all processes where the last step in the list is 'processing' here's the filter
let results2 = realm.objects(Process.self).filter("current_step == %#", ProcessStepType.processing.index)
The final thought is to add some code to the Process model so when a step is added to the list, the current_step var is also updated. Coding that is left to the OP.
I have had the store for years, but never added blog posts, so I am not sure how long this has been broken - it may have been from the very first version.
I am now looking at adding a blog to the store but selected 'new post' just gives a blank screen - the console in chrome shows the following errors.
> JQMIGRATE: Migrate is installed, version 1.4.1
data.min.js?ver=4.2.0:1 Uncaught TypeError: Object(...) is not a function
at Module.308 (data.min.js?ver=4.2.0:1)
at r (data.min.js?ver=4.2.0:1)
at wp.data.0 (data.min.js?ver=4.2.0:1)
at data.min.js?ver=4.2.0:1
post-new.php:2018 Uncaught TypeError: Cannot read property 'use' of undefined
at post-new.php:2018
at post-new.php:2020
The code is so abstracted that I am not sure what it is actually doing - but all the code is in wp-includes/js/dist/
And the bit of code throwing the error looks like this (the second line is highlighted as failing).
var A = {
reducer: Object(f.flowRight)([S("reducerKey"), S("selectorName")])(function() {
var t = arguments.length > 0 && void 0 !== arguments[0] ? arguments[0] : new m.a
, e = arguments.length > 1 ? arguments[1] : void 0;
switch (e.type) {
case "START_RESOLUTION":
case "FINISH_RESOLUTION":
var r = "START_RESOLUTION" === e.type
, n = new m.a(t);
return n.set(e.args, r),
n;
case "INVALIDATE_RESOLUTION":
var o = new m.a(t);
return o.delete(e.args),
o
}
return t
}),
I have tried this in chrome and edge, both get exactly the same result - same error, but a bit less informative in the edge console.
It seems to be a guttenburg/block editor issue, the old classic editor, can be enabled using this plug in
https://wordpress.org/plugins/classic-editor/
I am trying to pass contextInfo of typeUnsafeMutablePointer<Void> to UISaveVideoAtPathToSavedPhotosAlbum and use it in the callback function. For some reason I am unable to access contextInfo as a string using UnsafePointer<String>(x).memory when I am in the callback function.
I am pretty sure it is something simple I am missing but have spent way to many hours trying to figure this out.
Below is some code that I have tried.
The following code works.
var testStr:String = "hello"
takesAMutableVoidPointer(&testStr)
func takesAMutableVoidPointer(x: UnsafeMutablePointer<Void>){
var pStr:String = UnsafePointer<String>(x).memory
println("x = \(x)")
println("pStr = \(pStr)")
}
However the following code does not work.
var testStr:String = "hello"
if UIVideoAtPathIsCompatibleWithSavedPhotosAlbum(filePath){ //the filePath is compatible
println("Compatible")
//UISaveVideoAtPathToSavedPhotosAlbum(filePath, self, nil, nil)
UISaveVideoAtPathToSavedPhotosAlbum(filePath, self, "video:didFinishSavingWithError:contextInfo:", &testStr)
}
else{
println("Not Compatible")
}
func video(video: NSString, didFinishSavingWithError error:NSError, contextInfo:UnsafeMutablePointer<Void>){
var pStr:String = UnsafePointer<String>(contextInfo).memory
println("contextInfo = \(contextInfo)")
println("pStr = \(pStr)")
}
Once I get to the following line:
var pStr:String = UnsafePointer<String>(contextInfo).memory
I keep getting the following error:
Thread 1: EXC_BAD_ACCESS(code=1, address=0x0)
Any help with this would be greatly appreciated.
Thanks.
Update
Rintaro commented that testStr needs to be top level but the following code works.
import UIKit
class ViewController: UIViewController {
override func viewDidLoad() {
super.viewDidLoad()
// Do any additional setup after loading the view, typically from a nib.
var testStr:String = "hello"
takesAMutableVoidPointer(&testStr)
}
override func didReceiveMemoryWarning() {
super.didReceiveMemoryWarning()
// Dispose of any resources that can be recreated.
}
func takesAMutableVoidPointer(x: UnsafeMutablePointer<Void>){
var answer = UnsafePointer<String>(x).memory
println("x = \(x)")
println("answer = \(answer)")
}
}
I am trying not to use global variables unless I have to. I may have to but since I am able to execute the above code, it seems as though I do not need to use a global variable.
As discussed in OP comments, testStr has already been freed.
Is there any way to force the retaining of a variable that has been created in a function? Then release it later?
It's not impossible, but I don't know this is the best way to do that.
Anyway, try this with Playground or OS X "Command Line Tool" template:
import Foundation
func foo() {
var str:NSString = "Hello World"
let ptr = UnsafePointer<Void>(Unmanaged<NSString>.passRetained(str).toOpaque())
bar(ptr)
}
func bar(v:UnsafePointer<Void>) {
let at = dispatch_time(
DISPATCH_TIME_NOW,
Int64(2.0 * Double(NSEC_PER_SEC))
)
dispatch_after(at, dispatch_get_main_queue()) {
baz(v)
}
}
func baz(v:UnsafePointer<Void>) {
println("notified")
let str = Unmanaged<NSString>.fromOpaque(COpaquePointer(v)).takeRetainedValue()
println("info: \(str)")
}
foo()
println("started")
dispatch_main()
Unmanaged<NSString>.passRetained(str) increments the retain count.
Unmanaged<NSString>.fromOpaque(...).takeRetainedValue() decrements it, and extract the object.
I think, using pure Swift String is impossible. because String is struct and is allocated in stack memory. Maybe the buffer of it is allocated in heap, but we cannot access it directly.
I am making a search function and it works fine on an iphone and the iphone simulator but not the ipad simulator. When I enter my value to search it gives the error basically saying the NSRange is nil:
'NSInvalidArgumentException', reason: '* -[NSCFString rangeOfString:options:range:locale:]: nil argument'
Heres what I have.
for (int i = 0, c = names.count; i < c; ++i) {
sFirst = [firstArray objectAtIndex:i];
sSecond = [secondArray objectAtIndex:i];
NSRange result = [sFirst rangeOfString:searchText options:NSCaseInsensitiveSearch];
NSRange r = [sSecond rangeOfString:searchText options:NSCaseInsensitiveSearch];
if (result.location != NSNotFound) {
[searchedFirst addObject:sFirst];
[searchedSecond addObject:sSecond];
}
if (r.location != NSNotFound) {
[searchedFirst addObject:sFirst];
[searchedSecond addObject:sSecond];
}
}
Can anyone explain to me why this is happening, or is there anything I can do about this problem? Should I not worry about it since its working fine on an actual device?
SOLVED
I guess since i was calling the searchText (or searchBar.text) without changing the value into a string first it returned nil. So I just declared a string in the header file.
stringValue = searchBar.text;
An NSRange cannot be nil - it's not an object, not even a pointer.
It's most probably searchText that is nil.
And if it's buggy either on the simulator or on the device, you must fix it because it will fail some day.
I define a com object as a dynamic type in c# I am able to call methods quite easily.
However when I try to access a property on the same object I get an invalid cast exception.
The object in question is an array, passed to managed code from JavaScript, and I wish to get the length property of it as an int.
I know I am missing something odd because I am not getting a 'does not contain a definition' exception and I can access the property easily using reflection/InvokeMember.
Why can I not convert the length property of the dynamic type to an int?
For example
This Fails
dynamic com = comObject;
int i = com.length; // RTBE here.
This Works
Type type = comObject.GetType();
int i = (int)type.InvokeMember("length", BindingFlags.GetProperty, null, comObject, null);
* Update *
After a lot of testing I have narrowed this oddness to cases of multi-dimensional arrays.
The com object in question is a parameter passed from a html document to managed code. For all intents and purposes the object sometimes looks like this in JavaScript.
var x = ["a1", "a2", "a3"];
When an array like this comes to managed code I am able to get the length AOK using the type dynamic. (i.e. the first example here that fails actually works). However, if it is a multi-dimensional array such as the following structure in JavaScript.
var y = [["b1", "b2", "b3"], "a2", "a3"];
Then I get an error when trying to access its length property dynamically. Note, I can still access the length via reflection in this case. It seems to me that for some reason the length property does not get correctly mapped when a multidimensional array is used as a dynmaic type...
In my case what I have done to solve(!?) this is add a 'length_' property to the array like so before passing it.
var y = [["b1", "b2", "b3"], "a2", "a3"];
y.length_ = y.length;
Now in managed code I can accesses this property as expected without error. Far from ideal but seems to work...
dynamic com = comObject;
int i = com.length_; // 3!
Further Update
Ok, so it seems that as well as the length property the objects index gets lost to the dynamic type as well. Again it is accessible via reflection though...
Fails
dynamic com = comObject; // js array i.e. var x = [1, 2];
int i = com[0]; // MissingMemberException - Error while invoking [PROPERTYGET, DISPID(0)].
int i = com["0"]; // MissingMemberException - Error while invoking [PROPERTYGET, DISPID(0)].
Works
Type type = comObject.GetType();
int i = (int)type.InvokeMember("0", BindingFlags.GetProperty, null, comObject, null); // 1
In simple terms you can't access the length property of a multi-dimensional array in c# via the type dynamic unless, it seems, you have used the length property in JavaScript first...
The simple test below shows this very clearly. I hope this saves someone else the head scratching I have been having over the last day or so.
[ComVisibleAttribute(true)]
public partial class Form1 : Form
{
public Form1()
{
InitializeComponent();
webBrowser1.ObjectForScripting = this;
StringBuilder html = new StringBuilder();
html.Append("<script>");
html.Append("var arr1 = [1, 2, 3, 4];");
html.Append("var arr2 = [arr1, 2, 3, 4];");
html.Append("var fn1 = function() { return arr1; };");
html.Append("var fn2 = function() { return arr2; };");
html.Append("var fn3 = function() { alert(arr2.length); }");
html.Append("</script>");
webBrowser1.DocumentText = html.ToString();
webBrowser1.DocumentCompleted += (o, e) =>
{
dynamic arr1 = webBrowser1.Document.InvokeScript("fn1");
int i = arr1.length;
MessageBox.Show(i.ToString()); //4
// If I call fn3 here then the arr2.length *is* available as int i2 below!
////webBrowser1.Document.InvokeScript("fn3"); // 4
dynamic arr2 = webBrowser1.Document.InvokeScript("fn2");
int i2 = arr2.length;
MessageBox.Show(i2.ToString()); // unless fn3 is called you get...
/*
System.MissingMemberException was unhandled by user code
Message=Error while invoking length.
Source=System.Dynamic
StackTrace:
at System.Dynamic.ComRuntimeHelpers.CheckThrowException(Int32 hresult, ExcepInfo& excepInfo, UInt32 argErr, String message)
at CallSite.Target(Closure , CallSite , ComObject )
at System.Dynamic.UpdateDelegates.UpdateAndExecute1[T0,TRet](CallSite site, T0 arg0)
at CallSite.Target(Closure , CallSite , Object )
at System.Dynamic.UpdateDelegates.UpdateAndExecute1[T0,TRet](CallSite site, T0 arg0)
*/
};
}
}
update
It seems (see comments) that this behaviour is fixed if the WebBrowser control uses version 9 of Internet Explorer (...the control uses the version of IE on the machine). I can only presume that the IE9 'Chakra' JavaScript engine is doing something extra/different to the old js engine in this case.