Summary:
I have a stacktrace in dart, where I want to remove frame #0, and then have the whole stacktrace adjust (frame #1 is now frame #0, frame #2 is now frame #1).
Details:
I have written my own assert type function in dart, that if fails, will grab the current stacktrace and send to crashlytics.
static void asrt(bool condition)
{
if (condition)
return;
StackTrace stacktrace = StackTrace.current;
Crashlytics.instance.recordError("assert triggered" , stacktrace);
}
The problem is that crashlytics identifies each error based on the first stackframe. So all of my errors are being identified as that same error, because I am grabbing the stacktrace from the same method. I understand I could pass the stacktrace from the caller, but a preferrable solution to me would be to manipulate the stacktrace so the caller does less work.
Is this doable in dart?
I ended up getting a reliable solution.
I used the stack_trace library and its provided classes Trace and Frame.
In the following example, trace.frames returns an imutable list, so I perform a deep copy. I am ok with this as it only runs on a crash anyways.
StackTrace stacktrace = StackTrace.current;
Trace trace = Trace.from(stacktrace);
List<Frame> frames = trace.frames;
List<Frame> newFrames = List<Frame>();
// start at index 1 to omit frame #0
for (int i = 1; i < frames.length; i++) {
Frame f = frames[i];
newFrames.add(Frame(f.uri , f.line , f.column , f.member));
}
Trace newTrace = Trace(newFrames);
I can't recommend it, but you could use StackTrace.toString(), do text manipulation on it, and then use StackTrace.fromString to get a StackTrace object back.
But really I suggest that you file an issue against firebase_crashlytics and request some mechanism to allow considering more than the first frame.
Related
Korea's KAIST Revised and Distributed Pintos KAIST Project The same error occurred in all tests in the project 2 user program, so I am asking you this question. As a result of backtrace, an error appears because the return value of the intr_context() function in the thread_yield() function is false, but I don't know the cause and solution of this error. Can you tell me? ㅠㅠ
Kernel panic in run: PANIC at ../../threads/thread.c:338 in thread_yield(): assertion `!intr_context ()' failed.
Call stack: 0x800421874b 0x80042072c0 0x800420a92f 0x8004214d12 0x8004209704 0x8004209b22 0x800420762b
Translation of call stack:
0x000000800421874b: debug_panic (lib/kernel/debug.c:32)
0x00000080042072c0: thread_yield (threads/thread.c:340)
0x000000800420a92f: sema_up (threads/synch.c:124)
0x0000008004214d12: interrupt_handler (devices/disk.c:526)
0x0000008004209704: intr_handler (threads/interrupt.c:353)
0x0000008004209b22: intr_entry (threads/intr-stubs.o:?)
0x000000800420762b: kernel_thread (threads/thread.c:456)
thread_yield()
/* Yields the CPU. The current thread is not put to sleep and
may be scheduled again immediately at the scheduler's whim. */
void
thread_yield (void) {
struct thread *curr = thread_current ();
enum intr_level old_level;
ASSERT (!intr_context ());
old_level = intr_disable ();
if (curr != idle_thread)
// list_push_back (&ready_list, &curr->elem);
list_insert_ordered (&ready_list, &curr->elem, thread_compare_priority, 0);
do_schedule (THREAD_READY);
intr_set_level (old_level);
}
I think your code yield thread in sema_up() function.
when sema_up() call thread_yield() function, you make if condition about priority.
Add !intr_context() in your if condition.
That means when interrupted by externel(not internal), do not call thread_yield() .
Then your kernel no longer panic.
I have an HL7 message whose content I'm manipulating slightly with the terser.set() method. Once I've done that, I see in the debugger that it's been changed just how I want it, but I can't seem to get the whole message back intact. I've tried (for example):
HapiContext context = new DefaultHapiContext();
Parser parser = context.getGenericParser();
Message message = parser.parse( MESSAGE );
Terser terser = new Terser( message );
terser.set( "/PID-2", "XXX XX XXXX" );
String fixedMessage = message.encode();
...which gets me close, however, lines (segment lines) that ended in just vertical bars (pipes) with no values in their fields come back trimmed (the vertical bars are simply dropped). I want the message to remain identical to what I put in (if also modified where I did it on purpose).
I think you need to use addForcedEncode in the ParserConfiguration.
Like
#Test
public void testSetManualRepetitions() {
try {
String m = "MSH|^~\\&|hl7Integration|hl7Integration|||||ADT^A01|||2.3|\r" +
"EVN|A01|20130617154644\r" +
"PID|1|465 306 5961||407623|Wood^Patrick^^^MR||19700101|1||||||||||\r" +
"PV1|1||Location||||||||||||||||261938_6_201306171546|||||||||||||||||||||||||20130617134644|||||||||";
HapiContext hc = new DefaultHapiContext();
ExecutorService es = hc.getExecutorService(); // to avoid npe when closing context should be fixed https://sourceforge.net/p/hl7api/bugs/223/
ParserConfiguration pc = hc.getParserConfiguration();
PipeParser pipeParser = hc.getPipeParser();
Message message = pipeParser.parse(m);
Terser terser = new Terser(message);
//Add first Address
terser.set("/.PID-11(0)-1", "13 Oxford Road");
terser.set("/.PID-11(0)-3", "Oxford");
//Add second Address
terser.set("/.PID-11(1)-1", "16 London Road");
terser.set("/.PID-11(1)-3", "London");
pc.addForcedEncode("PID-26-1"); // make sure PID has 26 fields
System.out.println(message.encode().replaceAll("\r", "\r\n"));
hc.close();
} catch (HL7Exception e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
}
}
yields:
/Library/Java/JavaVirtualMachines/jdk1.8.0_31.jdk/Contents/Home/bin/java -ea -Didea.launcher.port=7540 "-Didea.launcher.bin.path=/Applications/IntelliJ IDEA CE.app/Contents/bin" -Dfile.encoding=UTF-8 -classpath "/Applications/IntelliJ IDEA CE.app/Contents/lib/idea_rt.jar:/Applications/IntelliJ IDEA CE.app/Contents/plugins/junit/lib/junit-rt.jar:/Library/Java/JavaVirtualMachines/jdk1.8.0_31.jdk/Contents/Home/jre/lib/charsets.jar:/Library/Java/JavaVirtualMachines/jdk1.8.0_31.jdk/Contents/Home/jre/lib/deploy.jar:/Library/Java/JavaVirtualMachines/jdk1.8.0_31.jdk/Contents/Home/jre/lib/ext/cldrdata.jar:/Library/Java/JavaVirtualMachines/jdk1.8.0_31.jdk/Contents/Home/jre/lib/ext/dnsns.jar:/Library/Java/JavaVirtualMachines/jdk1.8.0_31.jdk/Contents/Home/jre/lib/ext/jfxrt.jar:/Library/Java/JavaVirtualMachines/jdk1.8.0_31.jdk/Contents/Home/jre/lib/ext/localedata.jar:/Library/Java/JavaVirtualMachines/jdk1.8.0_31.jdk/Contents/Home/jre/lib/ext/nashorn.jar:/Library/Java/JavaVirtualMachines/jdk1.8.0_31.jdk/Contents/Home/jre/lib/ext/sunec.jar:/Library/Java/JavaVirtualMachines/jdk1.8.0_31.jdk/Contents/Home/jre/lib/ext/sunjce_provider.jar:/Library/Java/JavaVirtualMachines/jdk1.8.0_31.jdk/Contents/Home/jre/lib/ext/sunpkcs11.jar:/Library/Java/JavaVirtualMachines/jdk1.8.0_31.jdk/Contents/Home/jre/lib/ext/zipfs.jar:/Library/Java/JavaVirtualMachines/jdk1.8.0_31.jdk/Contents/Home/jre/lib/javaws.jar:/Library/Java/JavaVirtualMachines/jdk1.8.0_31.jdk/Contents/Home/jre/lib/jce.jar:/Library/Java/JavaVirtualMachines/jdk1.8.0_31.jdk/Contents/Home/jre/lib/jfr.jar:/Library/Java/JavaVirtualMachines/jdk1.8.0_31.jdk/Contents/Home/jre/lib/jfxswt.jar:/Library/Java/JavaVirtualMachines/jdk1.8.0_31.jdk/Contents/Home/jre/lib/jsse.jar:/Library/Java/JavaVirtualMachines/jdk1.8.0_31.jdk/Contents/Home/jre/lib/management-agent.jar:/Library/Java/JavaVirtualMachines/jdk1.8.0_31.jdk/Contents/Home/jre/lib/plugin.jar:/Library/Java/JavaVirtualMachines/jdk1.8.0_31.jdk/Contents/Home/jre/lib/resources.jar:/Library/Java/JavaVirtualMachines/jdk1.8.0_31.jdk/Contents/Home/jre/lib/rt.jar:/Library/Java/JavaVirtualMachines/jdk1.8.0_31.jdk/Contents/Home/lib/ant-javafx.jar:/Library/Java/JavaVirtualMachines/jdk1.8.0_31.jdk/Contents/Home/lib/dt.jar:/Library/Java/JavaVirtualMachines/jdk1.8.0_31.jdk/Contents/Home/lib/javafx-mx.jar:/Library/Java/JavaVirtualMachines/jdk1.8.0_31.jdk/Contents/Home/lib/jconsole.jar:/Library/Java/JavaVirtualMachines/jdk1.8.0_31.jdk/Contents/Home/lib/sa-jdi.jar:/Library/Java/JavaVirtualMachines/jdk1.8.0_31.jdk/Contents/Home/lib/tools.jar:/Users/thomas/git/Hapi-HL7-Terser/target/test-classes:/Users/thomas/.m2/repository/junit/junit/4.4/junit-4.4.jar:/Users/thomas/.m2/repository/ca/uhn/hapi/hapi-base/2.2/hapi-base-2.2.jar:/Users/thomas/.m2/repository/ca/uhn/hapi/hapi-structures-v21/2.2/hapi-structures-v21-2.2.jar:/Users/thomas/.m2/repository/ca/uhn/hapi/hapi-structures-v23/2.2/hapi-structures-v23-2.2.jar:/Users/thomas/.m2/repository/ca/uhn/hapi/hapi-structures-v24/2.2/hapi-structures-v24-2.2.jar:/Users/thomas/.m2/repository/ca/uhn/hapi/hapi-structures-v25/2.2/hapi-structures-v25-2.2.jar:/Users/thomas/.m2/repository/org/slf4j/slf4j-simple/1.6.0/slf4j-simple-1.6.0.jar:/Users/thomas/.m2/repository/org/slf4j/slf4j-api/1.6.0/slf4j-api-1.6.0.jar:/Users/thomas/.m2/repository/org/slf4j/log4j-over-slf4j/1.6.2/log4j-over-slf4j-1.6.2.jar" com.intellij.rt.execution.application.AppMain com.intellij.rt.execution.junit.JUnitStarter -ideVersion5 com.hl7integration.hapi.tests.SetRepetitionsTerserTest,testSetManualRepetitions
68 [main] INFO ca.uhn.hl7v2.util.Home - hapi.home is set to /Users/thomas/git/Hapi-HL7-Terser/.
170 [main] INFO ca.uhn.hl7v2.VersionLogger - HAPI version is: 2.2
197 [main] INFO ca.uhn.hl7v2.VersionLogger - Default Structure libraries found for HL7 versions 2.1, 2.3, 2.4, 2.5,
MSH|^~\&|hl7Integration|hl7Integration|||||ADT^A01|||2.3
EVN|A01|20130617154644
PID|1|465 306 5961||407623|Wood^Patrick^^^MR||19700101|1|||13 Oxford Road^^Oxford~16 London Road^^London|||||||||||||||
PV1|1||Location||||||||||||||||261938_6_201306171546|||||||||||||||||||||||||20130617134644
Technically you are not changing the message, you parse it to a Java object and encode it back to string. So that your output message looks like your input message. There could still be subtle differences afterwards (e.g. if your input message is dynamic).
From the docs (http://hl7api.sourceforge.net/configuring_hapi.html):
Forced Encoding
By default, when encoding a message HAPI will not encode any segments or fields that have no content and therefore have no semantic meaning in the message.
This can cause problems if you need to transmit a message to a system that expects certain empty content to be present in order to get "hints" about where in the message it is.
The addForcedEncode method may be used to add Terser paths which should be forced to be encoded:
parser.getParserConfiguration().addForcedEncode("PATIENT_RESULT/ORDER_OBSERVATION/ORC-4");
// ORC-4 will still exist (but be empty) even if ORC has no content
String encoded = parser.encode(message);
See the JavaDoc for examples.
It seems the exception stacktrace in iOS only contains the method name or there is a bug. Below is my code of handling exceptions in JSContext.
context.exceptionHandler = { (ctx: JSContext!, value: JSValue!) in
// type of String
let stacktrace = value.objectForKeyedSubscript("stack").toString()
// type of Number
let lineNumber = value.objectForKeyedSubscript("line")
// type of Number
let column = value.objectForKeyedSubscript("column")
let moreInfo = "in method \(stacktrace)Line number in file: \(lineNumber), column: \(column)"
Logger.error("JS ERROR: \(value) \(moreInfo)")
}
And I got logs like below
ERROR : JSContextRenderer.swift:308 : setupContext : JS ERROR: Error in method clearBackground
Line number in file: 162, column: 12"
Note there is a new line right after the "clearBackground" name, I think there probably more information there.
Can anybody having similar experience confirm? Any help is appreciated. Thanks.
Looks like it does show more information in the stack. Here is one of the log information I got:
JS ERROR: TypeError: undefined is not a function (evaluating 'msg.__assert__()') in method assert
syncShots
updateSync
initSync
setState
onLogicStateChanged
onLogicStateChanged
[native code]
updateMove
sendMove
shoot
onTouchUp
[native code]
_handleEvent
_dispatchEvent
. Line number in file: 183, column: 20
Long ago, #igrek asked where the keys in value come from. They're part of the Error object that was thrown by the JavaScript engine, and that now appears as value in the native error handler callback. What exactly Error includes depends on the implementation, but typically includes message, fileName, and lineNumber. It appears that stack is also supported. More details on the MDN page for Error .
I capture the image from an IP-Camera and I work with the frames. My programm reads when there is a movement, and then, it makes a photo and save it on the computer.
It works perfectly at first, but when it is running like 2-3 hours, it usually get an error, and I do not find a explanation for this. Because, if it is an error on getting the image or the processing, it should happens since first, shouldn't it?
The error I get is the next:
Exception in thread "main" java.lang.NullPointerException
at com.googlecode.javacv.IPCameraFrameGrabber.grab(IPCameraFrameGrabber.java:105)
at Llamada.main(Llamada.java:34)
I have looked for the error nº105 but I have not found anything.
The program is the next:
public class Llamada {
public static void main(String[] args) throws Exception {
IPCameraFrameGrabber grabber = new IPCameraFrameGrabber("http://192.168.2.102:80/mjpg/video.mjpg");
//OpenCVFrameGrabber grabber = new OpenCVFrameGrabber(0);
grabber.start();
IplImage frame = grabber.grab();
IplImage image = null;
IplImage prevImage = null;
IplImage diff = null;
Date data = new Date();
String output = "";
int i=0, j=0;
CanvasFrame canvasFrame = new CanvasFrame("IP Camera");
canvasFrame.setCanvasSize(frame.width(), frame.height());
CvMemStorage storage = CvMemStorage.create();
while (canvasFrame.isVisible() && (frame = grabber.grab()) != null) {
cvSmooth(frame, frame, CV_GAUSSIAN, 9, 9, 2, 2);
if (image == null) {
image = IplImage.create(frame.width(), frame.height(), IPL_DEPTH_8U, 1);
cvCvtColor(frame, image, CV_RGB2GRAY);
} else {
prevImage = IplImage.create(frame.width(), frame.height(), IPL_DEPTH_8U, 1);
prevImage = image;
image = IplImage.create(frame.width(), frame.height(), IPL_DEPTH_8U, 1);
cvCvtColor(frame, image, CV_RGB2GRAY);
}
if (diff == null) {
diff = IplImage.create(frame.width(), frame.height(), IPL_DEPTH_8U, 1);
}
if (prevImage != null) {
// perform ABS difference
cvAbsDiff(image, prevImage, diff);
// do some threshold for wipe away useless details
cvThreshold(diff, diff, 64, 255, CV_THRESH_BINARY);
canvasFrame.showImage(diff);
// recognize contours
CvSeq contour = new CvSeq(null);
cvFindContours(diff, storage, contour, Loader.sizeof(CvContour.class), CV_RETR_LIST, CV_CHAIN_APPROX_SIMPLE);
while (contour != null && !contour.isNull()) {
if (contour.elem_size() > 0) {
output = data.toString();
if (data != null)
output = output.substring(0,10);
if(i%300 == 0)
cvSaveImage((j++)+" "+ output +"-capture.jpg", frame);
CvBox2D box = cvMinAreaRect2(contour, storage);
// test intersection
if (box != null) {
CvPoint2D32f center = box.center();
CvSize2D32f size = box.size();
}
i++;
}
contour = contour.h_next();
}
}
}
grabber.stop();
canvasFrame.dispose();
}
}
Thank you for everything!
Have you tried using a debugger and setting a break point? I understand that waiting around for 2-3 hours isn't fun, but maybe it'd help you get a handle on what's going on.
That seems to be in your while loop's second conditional part. Something inside the method grab on the grabber object is throwing a NullPointerException.
Probably the way you've initialized the grabber has led it to do this.
And it would be useful to know which version of the IPCameraFrameGrabber class you're using and what the author of that class really expected. Namely it's initialized to respond to a particular camera's url. In reading the class, it would appear this makes no claim to work with all IP cameras' MJPEG streams.
Let's look at one example comment in there:
foscam url http://host/videostream.cgi?user=username&pwd=password
http://192.168.0.59:60/videostream.cgi?user=admin&pwd=password
android ipcam http://192.168.0.57:8080/videofeed
And compare that to your url:
http://192.168.2.102:80/mjpg/video.mjpg
I gather it is not a foscam videostream.cgi url nor an android ipcam videofeed url, which would appear to be the only tested urls. It reminds me of an Axis camera url. More on that later.
In a recent version of that class (also in the older one actually), there seems to be some hackish attempt at reading only to the end of a subheader that is always delimited by crlfcrlf which could have been done just as well with a buffered input reader reading lines until it gets an empty line. What I do see here that seems likely to cause an npe is:
When your url's http server's response does not contain the content-length header, which is quite possible, the returned readImage() byte[] is null.
Since javax.imageio.ImageIO specifies that it will throw an IllegalArgumentException when it gets a null input, I'm guessing it's the ByteArrayInputStream constructor in the grabBufferedImage method that's throwing this, the IplImage.createFrom(null) in the old version, or the b.length in the newer version that is.
None of the line numbers of these versions line up with the error message you've shown that you're getting, so maybe your version of the library is yet again different, and broken differently. Try using the debugger, edit and patch the source of the IPCameraFrameGrabber to better support your mjpeg over http "device" based on what you find out is really in the input stream of the http response.
Since the url format reminds me of an Axis camera, I tried this with one running firmware v5.50 with the boa server built in:
$ curl -I http://user:pass#10.10.10.10:8080/mjpg/video.mjpg
HTTP/1.0 200 OK
Cache-Control: no-cache
Pragma: no-cache
Expires: Thu, 01 Dec 1994 16:00:00 GMT
Connection: close
Content-Type: multipart/x-mixed-replace; boundary=myboundary
So you can see the content length is missing there. However, you do say you're getting frames initially for hours, then then, so I'm kind of at a loss with that part. I mean it sounds as though EITHER the input stream is getting closed, or the java implementation wrapping the stream, implemented in the http protocol handler, runs out of some kind of total space or open connection timer for some reason. I know this seems vague.
Another thing that seems odd is that from what I read in the two example classes of IPCameraFrameGrabber linked, every call to grab reads the input stream looking for headers first, which doesn't make sense to me right now, and I feel as though I must be misreading that.
all.I want to call a js function to show something in my plugin.This is my code
NPObject* npwindow = NULL;
NPError ret = browser->getvalue(mInstanceForJS, NPNVWindowNPObject, &npwindow);
if (ret != NPERR_NO_ERROR)
return ;
// Get window object.
NPVariant windowVar;
NPIdentifier winID = browser->getstringidentifier("window");
bool bRet = browser->getproperty(mInstanceForJS, npwindow, winID, &windowVar);
if (!bRet)
{
browser->releaseobject(npwindow);
return ;
}
NPObject* window = NPVARIANT_TO_OBJECT(windowVar);
NPVariant voidResponse;
NPVariant elementId;
STRINGZ_TO_NPVARIANT([info UTF8String], elementId);
NPVariant args[] = {elementId};
NPIdentifier funcID= browser->getstringidentifier([funName UTF8String]);
bRet = browser->invoke(mInstanceForJS, window, funcID, args, 1, &voidResponse);
browser->releasevariantvalue(&windowVar);
when called bRet = browser->invoke(mInstanceForJS, window, funcID, args, 1, &voidResponse);,Safari can not responsed.Is there any errors?
npwindow is already the window object; you're effectively querying for "window.window". Granted, I don't know why this wouldn't work, but it seems a little weird.
That's problem #1.
Problem #2 is that you're using STRINGZ_TO_NPVARIANT to store the result of UTF8String. STRINGZ_TO_NPVARIANT doesn't copy the memory, so you could be in trouble if the function wanted to hang onto that string, since the string returned by that will be freed when your autorelease pool cycles. Of course, that could also be a memory leak. Either way, the correct way to pass a string to the browser is to allocate memory for it using NPN_MemAlloc and then copy the string in. Then pass that pointer to the browser. See http://npapi.com/memory for more info.
Problem #3 is that you haven't given us any idea of when you are running this code; it's quite possible that you are trying to run this code too early in the plugin or page lifecycle and thus it may not work because of that.
Then there is another question: What do you mean by "Safari can no responsed"? Forgetting the grammatical error, I'm not sure what you mean by this. Does it hang? is bRet false? Does your computer suddenly get encased in ice, thus halting all processing? If the above is not helpful, please answer these questions and I'll try again.