xApp | 基于WebViewJavascriptBridge而设计并封装好的一种非常简单易用的Hybrid | Mobile Application library
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A Dead Simple Hybrid App Solution base on WebViewJavascriptBridge xApp是基于WebViewJavascriptBridge而设计并封装好的一种非常简单易用的Hybrid App的解决方案。指令式的交互方式。 .
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QUESTION
I am learning C programming from "Learn c the hard way by Zed Shaw". He asks the learner to try and break their own code.
So I tried the following C code and thought printing more values that I gave argv will break it but it did not until later.
...ANSWER
Answered 2021-May-30 at 09:48A segmentation fault happens when the code try to access a memory region that is not available.
Accessing an array out of bounds doesn't means that the memory before or after the area occupied by the array is not available: The compiler or the runtime usually put all varibales or data in general in a given block of memory. If your array is the last item of such a memory block, the accessing it with a to big index will produce a Segmentaion Fault but is the array is in the middle of the memory block, you will just access memory used for other data, giving unexpected result and undefined behavior.
If the array (In may example, but valid for anything) is written, accessing available memory will not produce a segmentation fault but will overwrite something else. It may produce unexpected results or crash or segmentation fault later! This kind of bug is frequently very difficult to find because the unexpected result/behavior looks completely independent of the root cause.
QUESTION
I'm writing some middle-ware in Python that uses Socket Mode. Non-async testing works fine. But the connect() call fails:
...ANSWER
Answered 2021-Apr-01 at 16:51In your traceback, it is referencing the builtin
client, aka the concurrent client. You're probably importing this:
QUESTION
I'm new to NodeJS Express, I was following the official tutorial from express-ws to setup websocket in the simple project generated by npx express-generator
. In the app.js, I've to explicitly call the app.listen(3000)
in order to make the ws connection working. Am I doing this correctly although it is working ? What's the difference between app.listen
vs. server.listen
in this case? what is app.set(port,port)
in www.js used for?
app.js - I've to add the last line below:
...ANSWER
Answered 2021-Mar-28 at 03:04The .listen(port)
method on either a server object or on the Express app object is what actually starts your server so that it is listening for incoming requests. Without that, you don't have a running http server. And, you need a running http server for both Express and for your webSocket. If you don't call something that triggers server.listen()
, then you won't have a running server. It will be all configured and waiting to start, but won't yet be running.
If you look at the code for app.listen()
, it is just a helper function. All, it does is this:
QUESTION
I have a workbook that has 84 sheets in it. In each sheet there are 2 columns. First column is application name and second column is its version.
I wrote a macro to get list of applications which is my first time writing. It works fine but its painfully slow. I never have worked with VBA before so I might did something wrong.
What I tried to accomplish is to get a summary report of installed apps. It searches the Application Report
sheet for every row in each sheet. If it isn't in the list, it adds a new row and then puts 1 as its count. If the application is in the list, it adds up 1 to its count.
ANSWER
Answered 2021-Jan-28 at 13:05A Double Dictionary Solution
QUESTION
I added a toolbar item of name refresh in tabbed page, below is the code of the tabbed page
...ANSWER
Answered 2020-Aug-07 at 14:18If the MainPage of App is a TabbedPage . You don't need to set it as NavigationPage . in App.
Modify the code in App.Xaml.CS
QUESTION
I'm trying to figure out the minimum requirements to initialize cpu1 from cpu0 in an amp configuration on a zynq-7000.
I have a given FSBL that hands over to u-boot with which I copy both programs (cpu0/1) from flash to different locations in ram (with sf read ...
).
I can run both programs on cpu0 out of u-boot with go [adr]
where adr is the start address of either program. I get the expected output on the uarts.
What does not work is that cpu0 should start cpu1 by writing its start address to register 0xffff_fff0
and after that issuing a system event sev
.
I do not enable any caches, MMUs or the SCU because I want to keep it as simple as possible (no synchronizations or flushes) until I achieved to start up cpu1. Or is this actually the problem and I do need any of these?
Currently I only initialize the vector table, print to the uart and additionally for core 0 try to start core 1:
...ANSWER
Answered 2020-Apr-16 at 10:25It turned out that cpu1 wasn't in wfe state. I suppose u-boot has already woken it up although it wasn't using it i.e. the state of cpu1 was not smp.
I had to execute a software reset on cpu 1 and bring it back into wfe state before issuing the sev
command according to AR#53828 from xilinx.
The steps should the link die were:
- Backup the registers that are overwritten in the next steps.
- Restore the WFE (wait for event) code in the OCM area. (I used assembly instead of the shown xilinx xsct commands as I don't have access to their IDE):
QUESTION
I have a simple array of 1,2,3 that I loop to render paragraphs. The problem is that whenever I add something like 4 to the array it doesn't appear on screen but the log shows the number 4 was added successfuly. How can I do it? I'm using lit-element 2.0.0 (version is very important, this.requestUpdate() doesn't work here but does in 2.3.1) Here's the code:
...ANSWER
Answered 2020-Mar-25 at 05:58You need this.requestUpdate to update state in your function
QUESTION
I have a slight issue here. I've made a custom view class that carries some data and I am trying to add it dynamically in my main activity, now when I try to add a single view it works fine. But when I put it in a for loop and let's say I want to add more than one the code breaks with this error:
...ANSWER
Answered 2017-Jan-29 at 18:25The problem is exactly what the error says:
QUESTION
I have one app in ionic that are stable in the vast majority of my clients.
But i have one client that have one Samsung S9 and when he open the app, instantly open a message:
The app has stopped
The client confirm that in the older versions the app run normaly.
This is my log available from Google Console:
java.lang.RuntimeException:
at android.view.DisplayListCanvas.throwIfCannotDraw (DisplayListCanvas.java:229)
at android.view.RecordingCanvas.drawBitmap (RecordingCanvas.java:97)
at android.graphics.drawable.BitmapDrawable.draw (BitmapDrawable.java:529)
at android.widget.ImageView.onDraw (ImageView.java:1367)
at android.view.View.draw (View.java:20338)
at android.view.View.updateDisplayListIfDirty (View.java:19283)
at android.view.View.draw (View.java:20061)
at android.view.ViewGroup.drawChild (ViewGroup.java:4421)
at android.view.ViewGroup.dispatchDraw (ViewGroup.java:4207)
at android.view.View.updateDisplayListIfDirty (View.java:19274)
at android.view.View.draw (View.java:20061)
at android.view.ViewGroup.drawChild (ViewGroup.java:4421)
at android.view.ViewGroup.dispatchDraw (ViewGroup.java:4207)
at android.view.View.updateDisplayListIfDirty (View.java:19274)
at android.view.View.draw (View.java:20061)
at android.view.ViewGroup.drawChild (ViewGroup.java:4421)
at android.view.ViewGroup.dispatchDraw (ViewGroup.java:4207)
at android.view.View.draw (View.java:20341)
at com.android.internal.policy.DecorView.draw (DecorView.java:979)
at android.view.View.updateDisplayListIfDirty (View.java:19283)
at android.view.ThreadedRenderer.updateViewTreeDisplayList (ThreadedRenderer.java:686)
at android.view.ThreadedRenderer.updateRootDisplayList (ThreadedRenderer.java:692)
at android.view.ThreadedRenderer.draw (ThreadedRenderer.java:800)
at android.view.ViewRootImpl.draw (ViewRootImpl.java:3488)
at android.view.ViewRootImpl.performDraw (ViewRootImpl.java:3275)
at android.view.ViewRootImpl.performTraversals (ViewRootImpl.java:2810)
at android.view.ViewRootImpl.doTraversal (ViewRootImpl.java:1779)
at android.view.ViewRootImpl$TraversalRunnable.run (ViewRootImpl.java:7810)
at android.view.Choreographer$CallbackRecord.run (Choreographer.java:911)
at android.view.Choreographer.doCallbacks (Choreographer.java:723)
at android.view.Choreographer.doFrame (Choreographer.java:658)
at android.view.Choreographer$FrameDisplayEventReceiver.run (Choreographer.java:897)
at android.os.Handler.handleCallback (Handler.java:789)
at android.os.Handler.dispatchMessage (Handler.java:98)
at android.os.Looper.loop (Looper.java:164)
at android.app.ActivityThread.main (ActivityThread.java:6938)
at java.lang.reflect.Method.invoke (Native Method)
at com.android.internal.os.Zygote$MethodAndArgsCaller.run (Zygote.java:327)
at com.android.internal.os.ZygoteInit.main (ZygoteInit.java:1374)
My ionic info:
Ionic:
ionic (Ionic CLI) : 4.1.1 (C:\Users\jsoftwares1\AppData\Roaming\npm\node_modules\ionic) Ionic Framework : ionic-angular 3.9.2 @ionic/app-scripts : 3.1.11
Cordova:
cordova (Cordova CLI) : 8.0.0 Cordova Platforms : not available Cordova Plugins : cordova-plugin-ionic-keyboard 2.1.2, cordova-plugin-ionic-webview 1.2.1, (and 16 other plugins)
System:
Android SDK Tools : 26.1.1 (C:\Users\jsoftwares1\Desktop\tools\lib) NodeJS : v8.11.3 (C:\Program Files\nodejs\node.exe) npm : 6.4.0 OS : Windows 10
My cordova plugins:
...ANSWER
Answered 2018-Nov-08 at 10:30I fix in config.xml, my assets is wrong.
I do:
QUESTION
I have downloaded the pre-built binaries of wxWidgets 3.1.2
and placed it in my minGW
folder. In Code::Blocks
I run the wizard for creating the wxWidgets application just to check whether the wxWidgets is working. I started building the project and showed me some series of errors I rectified it.
But I couldn't get these errors:
...ANSWER
Answered 2019-Mar-16 at 06:31You have UI elements so you need at least core
library too (i.e. libwxmsw31ud_core.a
).
There is a Library List page that you might find useful. And you can go to the folder where your libwxbase31ud.a
currently is, to find the corresponding file for each library.
Another good place to look for lib details is the makefile.gcc
of a sample that comes with wxWidgets.
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