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  • How to use SerialPort SerialDataReceived help

    - by devnet247
    Hi Not sure how to handle SerialPort DataReceived. Scenario I have an application that communicate with a device and this device returns a status .This happens in different stages EG public enum ActionState { Started, InProgress, Completed etc... } Now if I were to use the DataReceivedEventHandler how can I tell what Method is executing? eg Action1 or Action2 etc...? I also want to include some sort of timeout when getting back stuff from device. Any example or advice? public ActionState Action1 { serialPort.write(myData); string result=serialPort.ReadExisting()); //convertTo ActionState and return return ConvertToActionState(result); } public ActionState Action2 { serialPort.write(myData); string result=serialPort.ReadExisting()); //convertTo ActionState and return return ConvertToActionState(result); } private void port_DataReceived(object sender, SerialDataReceivedEventArgs e) { //How can I use this to detect which method is firing and set the actionState Enum accordingly? } private ActionState(string result) { if(result==1) return ActionState.Started; else if (result==2) return ActionState.Completed etc... }

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  • Problems with jQuery load and getJSON only when using Chrome

    - by leftend
    I'm having an issue with two jQuery calls. The first is a "load" that retrieves HTML and displays it on the page (it does include some Javascript and CSS in the code that is returned). The second is a "getJSON" that returns JSON - the JSON returned is valid. Everything works fine in every other browser I've tried - except Chrome for either Windows or Mac. The page in question is here: http://urbanistguide.com/category/Contemporary.aspx When you click on a Restaurant name in IE/FF, you should see that item expand with more info - and a map displayed to the right. However, if you do this in Chrome all you get is the JSON data printed to the screen. The first problem spot is when the "load" function is called here: var fulllisting = top.find(".listingfull"); fulllisting.load(href2, function() { fulllisting.append("<div style=\"width:99%;margin-top:10px;text-align:right;\"><a href=\"#\" class=\"" + obj.attr("id") + "\">X</a>"); itemId = fulllisting.find("a.listinglink").attr("id"); ... In the above code, the callback function doesn't seem to get invoked. The second problem spot is when the "getJSON" function is called: $.getJSON(href, function(data) { if (data.error.length > 0) { //display error message } else { ... } In this case - it just seems to follow the link instead of performing the callback... and yes, I am doing a "return false;" at the end of all of this to prevent the link from executing. All of the rest of the code is inline on that page if you want to view the source code. Any ideas?? Thanks

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  • Maven doesn't compile target/hibernate3/generated-sources

    - by mmm
    Can someone tell me how to configure maven for it also to compile sources from the target/hibernate3/generated-sources directory? I have already read this and other posts but they don't seem to solve my problem (which indeed seems trivial). I have used the bottom-up approach hibernate configuration for cfg.xml, hbm.xml and POJO generation (i.e. auto-generated the complete hibernate configuration out of an existing database schema). I'm also only using standard maven and hibernate3-plugin directory layouts. Yet, when executing mvn compile in the command-line while my sources are in the src/main/java and the generated sources in /target/hibernate3/generated-sources only the ones from src/main/java get compiled and copied into target/classes. I wouldn't like to generate sources into src/main/java as I'd like mvn clean to clean them. I'd like to solve the problem using command-line, plugins and pom.xml only. Is there a way to configure maven-compiler-plugin to do so? Or is there another way? Regards and thanks for any help.

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  • echo command not found while testing selenium with phpunit

    - by Bill Szerdy
    I am getting an ERROR: Unknown command: 'echo' executing a selenium script with phpunit. Based on the output that echo command should be included in my version of PHPUnit. The selenium script does execute successfully in the firefox selenium IDE. mkdir_build: phpunit: [exec] PHPUnit 3.4.12 by Sebastian Bergmann. [exec] [exec] . [exec] TestFull [exec] E [exec] [exec] Time: 11 seconds, Memory: 6.50Mb [exec] [exec] There was 1 error: [exec] [exec] 1) TestFull::testNumberOne [exec] PHPUnit_Framework_Exception: Response from Selenium RC server for testComplete(). [exec] ERROR: Unknown command: 'echo'. [exec] [exec] [exec] /directory/to/tests/TestFull.php:14 [exec] [exec] FAILURES! [exec] Tests: 1, Assertions: 0, Errors: 1. And the RC server output: $ java -jar selenium-server.jar -port 4445 -debug 13:23:08.426 INFO - Java: Sun Microsystems Inc. 14.2-b01 13:23:08.428 INFO - OS: Linux 2.6.28-15-server i386 13:23:08.439 INFO - v2.0 [a2], with Core v2.0 [a2] 13:23:08.439 INFO - Selenium server running in debug mode. 13:25:05.661 DEBUG - ---------retrieving CommandQueue for sel_93352 13:25:05.662 DEBUG - Browser 2c8b3b5657a640db9fb278ecbd01049e/:top sel_93352 posted ERROR: Unknown command: 'echo' 13:25:05.662 DEBUG - ---------retrieving CommandQueue for sel_93352 13:25:05.662 DEBUG - putting command: ERROR: Unknown command: 'echo' 13:25:05.662 DEBUG - ..command put?: true 13:25:05.662 DEBUG - sel_93352 commandHolder sel_93352 getCommand() called 13:25:05.662 DEBUG - waiting for data for at most 10 more s 13:25:05.662 DEBUG - data from polling: ERROR: Unknown command: 'echo' 13:25:05.662 DEBUG - sel_93352 commandResultHolder sel_93352 getResult() -> ERROR: Unknown command: 'echo' 13:25:05.663 DEBUG - Got result: ERROR: Unknown command: 'echo' on session 2c8b3b5657a640db9fb278ecbd01049e 13:25:05.663 INFO - Got result: ERROR: Unknown command: 'echo' on session 2c8b3b5657a640db9fb278ecbd01049e 13:25:05.663 DEBUG - Handled by org.openqa.selenium.server.SeleniumDriverResourceHandler in HttpContext[/selenium-server,/selenium-server] 13:25:05.663 DEBUG - RESPONSE: HTTP/1.1 200 OK Date: Wed, 07 Apr 2010 20:25:05 GMT Server: Jetty/5.1.x (Linux/2.6.28-15-server i386 java/1.6.0_16 Cache-Control: no-cache Pragma: no-cache Expires: Thu, 01 Jan 1970 00:00:00 GMT Content-Type: text/plain Connection: close

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  • Unknown Exception on trying to initialize the web service stub created by Axis C++

    - by Harsha Reddy
    Hi, I am trying out the sample calculator program given in the folder of axis c++. I am mainly interested in the client side. So I used the wsdl to create the stubs and my main is pretty much the same as given in the sample. However on executing the call Calculator ws (endpoint) I get an unknown exception "First-chance exception at 0x7c0024b9 in CalculatorClient.exe: 0xC0000005: Access violation reading location 0x00000000. First-chance exception at 0x7c812afb in CalculatorClient.exe: Microsoft C++ exception: [rethrow] at memory location 0x00000000.. Unhandled exception at 0x7c0024b9 in CalculatorClient.exe: 0xC0000005: Access violation reading location 0x00000000." and the exception causing code is Calculator::Calculator(const char* pchEndpointUri, AXIS_PROTOCOL_TYPE eProtocol) :Stub(pchEndpointUri, eProtocol) { } I had earlier tried to run a a webservice using Axis C++ but had received the same error. At that time my web service was a java ws on WAS. Then I later tried the calculator client (but this time I did not have any server hosting the ws as I just wanted to check if the Client could initialize). Is the problem caused due to the web service not being hosted on Apache in C++ (though I highly doubt it). Any help would be appreciated. Thanks, Harsha

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  • Should a Perl constructor return an undef or a "invalid" object?

    - by DVK
    Question: What is considered to be "Best practice" - and why - of handling errors in a constructor?. "Best Practice" can be a quote from Schwartz, or 50% of CPAN modules use it, etc...; but I'm happy with well reasoned opinion from anyone even if it explains why the common best practice is not really the best approach. As far as my own view of the topic (informed by software development in Perl for many years), I have seen three main approaches to error handling in a perl module (listed from best to worst in my opinion): Construct an object, set an invalid flag (usually "is_valid" method). Often coupled with setting error message via your class's error handling. Pros: Allows for standard (compared to other method calls) error handling as it allows to use $obj->errors() type calls after a bad constructor just like after any other method call. Allows for additional info to be passed (e.g. 1 error, warnings, etc...) Allows for lightweight "redo"/"fixme" functionality, In other words, if the object that is constructed is very heavy, with many complex attributes that are 100% always OK, and the only reason it is not valid is because someone entered an incorrect date, you can simply do "$obj->setDate()" instead of the overhead of re-executing entire constructor again. This pattern is not always needed, but can be enormously useful in the right design. Cons: None that I'm aware of. Return "undef". Cons: Can not achieve any of the Pros of the first solution (per-object error messages outside of global variables and lightweight "fixme" capability for heavy objects). Die inside the constructor. Outside of some very narrow edge cases, I personally consider this an awful choice for too many reasons to list on the margins of this question. UPDATE: Just to be clear, I consider the (otherwise very worthy and a great design) solution of having very simple constructor that can't fail at all and a heavy initializer method where all the error checking occurs to be merely a subset of either case #1 (if initializer sets error flags) or case #3 (if initializer dies) for the purposes of this question. Obviously, choosing such a design, you automatically reject option #2.

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  • C# Client to Consume Google App Engine RESTful Webservice (rpc XML)

    - by Ngu Soon Hui
    I think I hit a problem when using C# client to consume Google App Engine Webservice. The Google App Engine code I use is here. This is how the python script on server would look like: from google.appengine.ext import webapp from google.appengine.ext.webapp.util import run_wsgi_app import logging from StringIO import StringIO import traceback import xmlrpclib from xmlrpcserver import XmlRpcServer class Application: def __init__(self): pass def getName(self,meta): return 'example' class XMLRpcHandler(webapp.RequestHandler): rpcserver = None def __init__(self): self.rpcserver = XmlRpcServer() app = Application() self.rpcserver.register_class('app',app) def post(self): request = StringIO(self.request.body) request.seek(0) response = StringIO() try: self.rpcserver.execute(request, response, None) except Exception, e: logging.error('Error executing: '+str(e)) for line in traceback.format_exc().split('\n'): logging.error(line) finally: response.seek(0) rstr = response.read() self.response.headers['Content-type'] = 'text/xml' self.response.headers['Content-length'] = "%d"%len(rstr) self.response.out.write(rstr) application = webapp.WSGIApplication( [('/xmlrpc/', XMLRpcHandler)], debug=True) def main(): run_wsgi_app(application) if __name__ == "__main__": main() The client side ( in Python) is this: import xmlrpclib s = xmlrpclib.Server('http://localhost:8080/xmlrpc/') print s.app.getName() I have no problem in using Python client to retrieve values from Google App Engine, but I do have difficulties in using a C# client to retrieve the values. The error I got was 404 method not found when I am trying to GetResponse from the web request. This is my code var request = (HttpWebRequest)WebRequest.Create("http://localhost:8080/xmlrpc/app"); request.Method = "GET"; request.ContentLength = 0; request.ContentType = "text/xml"; using (HttpWebResponse response = request.GetResponse() as HttpWebResponse) //404 method not found error here. { } I think it must be that the url is wrong, but I don't know how to get it right. Any idea?

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  • forkpty - socket

    - by Alexxx
    Hi, I'm trying to develop a simple "telnet/server" daemon which have to run a program on a new socket connection. This part working fine. But I have to associate my new process to a pty, because this process have some terminal capabilities (like a readline). The code I've developped is (where socketfd is the new socket file descriptor for the new input connection) : int masterfd, pid; const char *prgName = "..."; char *arguments[10] = ....; if ((pid = forkpty(&masterfd, NULL, NULL, NULL)) < 0) perror("FORK"); else if (pid) return pid; else { close(STDOUT_FILENO); dup2(socketfd, STDOUT_FILENO); close(STDIN_FILENO); dup2(socketfd, STDIN_FILENO); close(STDERR_FILENO); dup2(socketfd, STDERR_FILENO); if (execvp(prgName, arguments) < 0) { perror("execvp"); exit(2); } } With that code, the stdin / stdout / stderr file descriptor of my "prgName" are associated to the socket (when looking with ls -la /proc/PID/fd), and so, the terminal capabilities of this process doesn't work. A test with a connection via ssh/sshd on the remote device, and executing "localy" (under the ssh connection) prgName, show that the stdin/stdout/stderr fd of this process "prgName" are associated to a pty (and so the terminal capabilities of this process are working fine). What I am doing wrong? How to associate my socketfd with the pty (created by forkpty) ? Thank Alex

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  • Far jump in ntdll.dll's internal ZwCreateUserProcess

    - by user49164
    I'm trying to understand how the Windows API creates processes so I can create a program to determine where invalid exes fail. I have a program that calls kernel32.CreateProcessA. Following along in OllyDbg, this calls kernel32.CreateProcessInternalA, which calls kernel32.CreateProcessInternalW, which calls ntdll.ZwCreateUserProcess. This function goes: mov eax, 0xAA xor ecx, ecx lea edx, dword ptr [esp+4] call dword ptr fs:[0xC0] add esp, 4 retn 0x2C So I follow the call to fs:[0xC0], which contains a single instruction: jmp far 0x33:0x74BE271E But when I step this instruction, Olly just comes back to ntdll.ZwCreateUserProcess at the add esp, 4 right after the call (which is not at 0x74BE271E). I put a breakpoint at retn 0x2C, and I find that the new process was somehow created during the execution of add esp, 4. So I'm assuming there's some magic involved in the far jump. I tried to change the CS register to 0x33 and EIP to 0x74BE271E instead of actually executing the far jump, but that just gave me an access violation after a few instructions. What's going on here? I need to be able to delve deeper beyond the abstraction of this ZwCreateUserProcess to figure out how exactly Windows creates processes.

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  • [Repost-ish] Impossibly slow queries, Tables indexed, How can I speed it up?

    - by colorfulgrayscale
    Hi guys, I posted a little earlier on here at http://stackoverflow.com/questions/2656837/query-results-taking-too-long-on-200k-database-speed-up-tips asking about slow executing SQL queries. I was told to index the columns; I did. and its still slow (slow as in, i never see the results, both mysql and sqlite freeze up on query). Help would be greatly appreciated. Here is the SQL SELECT equipment.`unitID` AS `equipment_unitID`, equipment.`fleetCode` AS `equipment_fleetCode`, equipment.type AS equipment_type, equipment.tiremap AS equipment_tiremap, tiremap.`TireID` AS `tiremap_TireID`, tiremap.`WorkMap` AS `tiremap_WorkMap`, tiremap.`Position` AS `tiremap_Position`, tiremap.`DepthMap` AS `tiremap_DepthMap`, tiremap.timestamp AS tiremap_timestamp, workreference.`aMap` AS `workreference_aMap`, workreference.`bMap` AS `workreference_bMap`, tirework.`RO` AS `tirework_RO`, tirework.location AS tirework_location, tirework.mileage AS tirework_mileage, tirework.`mechanicCode` AS `tirework_mechanicCode`, tirework.`partNumber` AS `tirework_partNumber`, tirework.`historyID` AS `tirework_historyID`, tirework.workmap AS tirework_workmap, tirework.timestamp AS tirework_timestamp FROM equipment, tiremap, workreference, tirework WHERE equipment.tiremap = tiremap.`TireID` AND tiremap.`WorkMap` = workreference.`aMap` AND workreference.`bMap` = tirework.workmap LIMIT 5 and here is the EXPLAIN for it id select_type table type possible_keys key key_len ref rows Extra 1 SIMPLE equipment ALL tiremap 14079 1 SIMPLE tiremap ref PRIMARY,WorkMap,TireID,WorkMap_2 PRIMARY 52 tire.equipment.tiremap 3 1 SIMPLE workreference ref aMap,bMap aMap 52 tire.tiremap.WorkMap 1 1 SIMPLE tirework eq_ref NewIndex1 NewIndex1 52 tire.workreference.bMap 1

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  • Using Fantom USB Driver from JNI

    - by Starky
    I'm having some difficulty with JNI. I'm using JNI to call some Java methods from a C++ program. This implementation of JNI is working fine. The goal of the Java program is to send commands over USB to a LEGO robot using LEJOS. This works fine when running the Java program by itself but for some reason when I call the methods from C++ the robot cannot be detected. My only lead so far is that there may be some problem using the Fantom USB driver from a JNI call. This is the driver that's used for the USB connection to the robot. I've had a quick look at the code for the driver and it looks like it makes use of JNI too. So I guess I'm asking the following things: What differences could there be between calling code from JNI and executing it through command prompt with the 'java classname args' method which could cause this problem? Could it be that there is some problem with me using JNI in C++ when the driver that's being used uses JNI as well? I won't post any code just now as I don't think it's really relevant but if anyone thinks that they need to see it then I can add it.

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  • ColdFusion 8: Database Connection Reset Error

    - by Gavin
    I have been getting these intermittent ColdFusion Database connection reset errors and was wondering if anyone had experience with this and had a particular solution that worked? Here is the error: Error Executing Database Query.[Macromedia][SQLServer JDBC Driver]A problem occurred when attempting to contact the server (Server returned: Connection reset). Please ensure that the server parameters passed to the driver are correct and that the server is running. Also ensure that the maximum number of connections have not been exceeded for this server. This doesn't happen with any particular query, the code breaks in different queries every time, returning a SQLState error 08s01. These query's logic are fine, no logic errors etc. I checked the network logs and there were no database server connection refusals at the time of the error. Once the first error occurs, it keeps happening for no more than a minute or so at random times of the day, every few days. I've googled this thing and so far anyone that has had this issue was only on CF6 or 7, which the fixes coldFusion put out are only for CF6 or 7. Server configuration wise: The ColdFusion server is version 8 The database server is SQL Server 2005 Standard The database connections allowed setting is set to unlimited on both SQL Server and ColdFusion Any help would be greatly appreciated, Thanks!

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  • perl issuing os command with defined variables

    - by Vinnie Biros
    I am adding functionality into my scripts so that they can use kerberos authentication to run automatically and use secure protocols when executing. I have my functionality working for shell scripts that do exactly what i want, however i am having issues porting it to perl to work within my perl scripts as i am new to perl. Here is my working shell code and trying to get the same functionality in perl: #!/bin/sh ticketFileName=`basename $0-$$` #set filename variable to name of script plus the PID krb5CacheLocation=/tmp/$ticketFileName #set ticket cache location to /tmp + script name /usr/share/centrifydc/kerberos/bin/kinit -c $krb5CacheLocation -kt /root/.ssh/someaccount.keytab someaccount #get TGT and specifiy ticket cache location on kinit export KRB5CCNAME=$krb5CacheLocation #set the KRB5CCNAME variable to tell ssh where to look What i have attempted in perl: #!/usr/bin/perl my $ticketFileName = `basename $0-$$`; my $krb5CacheLocation = '/tmp/'.$ticketFileName; `export KRB5CCNAME=$krb5CacheLocation`; `/usr/share/centrifydc/kerberos/bin/kinit -c $krb5CacheLocation -kt /root/.ssh/unixmap0000.keytab unixmap0000`; Seems it is not liking the passed variable that i am referencing in the OS command. Anyone have any ideas or suggestions?

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  • unable to use turboc through xp. why? solution?

    - by Fizz
    hi, im having problems opening directly turboc++ compiler(dos version) on xp. if i d-click on the tc icon through windows gui it opens for a sec(a blank dos screen) and shuts down. so i hv to acces through cmd and then adress of turboc and tc i.e., cmd (enter) c:\tc\bin (enter) tc.exe this way tc opens and im able to program all text programming.. why do i have to always start tc through dos..why can't i start it through xp. also,after starting tc through dos, im unable to execute any graphics program through it.. i write a simple code for creating a circle using predefined functions.. all directories have been set as per req. when i compile and run the prog. tc exits and returns to dos cmd prompt. why does this happen? solution? i hv also tried using dos box to run turboc. it closes automatically on executing the grapics program.. plzz help...

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  • Testing background audio in the simulator

    - by Cactuar
    I'm experimenting with the new background audio service in iPhone OS 4.0 but I can't get it to work in the simulator. According to this page: iPhone Application Programming Guide: Executing Code in the Background it seems that all I have to do is add the a UIBackgroundModes key with an array containing audio to my Info.plist file and the audio my application plays should automatically continue when I switch to another app. I have done this but the audio still pauses as I switch to another app, when I switch back it continues where it left off. This is the code I'm using to play the sound: NSURL *url = [NSURL fileURLWithPath:[NSString stringWithFormat:@"%@/audio.mp3", [[NSBundle mainBundle] resourcePath]]]; NSError *error; audioPlayer = [[AVAudioPlayer alloc] initWithContentsOfURL:url error:&error]; audioPlayer.numberOfLoops = -1; if (audioPlayer == nil) NSLog(@"%@", [error userInfo]); else [audioPlayer play]; Has anyone gotten this to work? Could it be that it would work on an actual device and it's just a problem with the simulator? I'm a bit hesitant to install 4.0 on my phone since I've heard it's still very buggy. Wish I had another device to use only for development.

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  • Qmake does not specify a valid qt

    - by Comptrol
    After installing Qt SDK for Open Source C++ development on Mac OS by following the respective steps Note for the binary package: If you have the binary package, simply double-click on the Qt.mpkg and follow the instructions to install Qt. . Yes, that is all I have done to install Qt on MacOsX. Everything was going fine, until I run a sample application, of which compile output resulted in: No valid Qt version set. Set one in Preferences Error while building project qtilk When executing build step 'QMake' Canceled build. Then I tried to change the respective Qt version in Preferences and I hovered over the Path, I realized my mkspec isn't set: Then I tried querying qmake by qmake -query : QT_INSTALL_PREFIX:/ QT_INSTALL_DATA:/usr/local/Qt4.6 QT_INSTALL_DOCS:/Developer/Documentation/Qt QT_INSTALL_HEADERS:/usr/include QT_INSTALL_LIBS:/Library/Frameworks QT_INSTALL_BINS:/Developer/Tools/Qt QT_INSTALL_PLUGINS:/Developer/Applications/Qt/plugins QT_INSTALL_TRANSLATIONS:/Developer/Applications/Qt/translations QT_INSTALL_CONFIGURATION:/Library/Preferences/Qt QT_INSTALL_EXAMPLES:/Developer/Examples/Qt/ QT_INSTALL_DEMOS:/Developer/Examples/Qt/Demos QMAKE_MKSPECS:/usr/local/Qt4.6/mkspecs QMAKE_VERSION:2.01a QT_VERSION:4.6.2 QMAKE_MKSPECS seems to be set here?? Will setting my mkspec solve my building problem? I tried setting by typing export mkspec=macx-g++. Still, mkspec seems not to be set to anything. I am all ears waiting for your answers. Thanks in advance.

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  • SQL deadlock on delete then bulk insert

    - by StarLite
    I have an issue with a deadlock in SQL Server that I haven't been able to resolve. Basically I have a large number of concurrent connections (from many machines) that are executing transactions where they first delete a range of entries and then re-insert entries within the same range with a bulk insert. Essentially, the transaction looks like this BEGIN TRANSACTION T1 DELETE FROM [TableName] WITH( XLOCK HOLDLOCK ) WHERE [Id]=@Id AND [SubId]=@SubId INSERT BULK [TableName] ( [Id] Int , [SubId] Int , [Text] VarChar(max) COLLATE SQL_Latin1_General_CP1_CI_AS ) WITH(CHECK_CONSTRAINTS, FIRE_TRIGGERS) COMMIT TRANSACTION T1 The bulk insert only inserts items matching the Id and SubId of the deletion in the same transaction. Furthermore, these Id and SubId entries should never overlap. When I have enough concurrent transaction of this form, I start to see a significant number of deadlocks between these statements. I added the locking hints XLOCK HOLDLOCK to attempt to deal with the issue, but they don't seem to be helpling. The canonical deadlock graph for this error shows: Connection 1: Holds RangeX-X on PK_TableName Holds IX Page lock on the table Requesting X Page lock on the table Connection 2: Holds IX Page lock on the table Requests RangeX-X lock on the table What do I need to do in order to ensure that these deadlocks don't occur. I have been doing some reading on the RangeX-X locks and I'm not sure I fully understand what is going on with these. Do I have any options short of locking the entire table here?

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  • WCF: How can I send data while gracefully closing a connection?

    - by mafutrct
    I've got a WCF service that offers a Login method. A client is required to call this method (due to it being the only IsInitiating=true). This method should return a string that describes the success of the call in any case. If the login failed, the connection should be closed. The issue is with the timing of the close. I'd like to send the return value, then immediately close the connection. string Login (string name, string pass) { if (name != pass) { OperationContext.Current.Channel.Close (); return "fail"; } else { return "yay"; } } The MSDN states that calling Close on the channel causes an ICommunicationObject to gracefully transition from the Opened state to the Closed state. The Close method allows any unfinished work to be completed before returning. For example, finish sending any buffered messages). This did not work for me (or my understanding is wrong), as the close is executed immediately - WCF does not wait for the Login method to finish executing and return a string but closes the connection earlier. Therefore I assume that calling Close does not wait for the running method to finish. Now, how can I still return a value, then close?

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  • Force creation of query execution plan

    - by Marc
    I have the following situation: .net 3.5 WinForm client app accessing SQL Server 2008 Some queries returning relatively big amount of data are used quite often by a form Users are using local SQL Express and restarting their machines at least daily Other users are working remotely over slow network connections The problem is that after a restart, the first time users open this form the queries are extremely slow and take more or less 15s on a fast machine to execute. Afterwards the same queries take only 3s. Of course this comes from the fact that no data is cached and must be loaded from disk first. My question: Would it be possible to force the loading of the required data in advance into SQL Server cache? Note My first idea was to execute the queries in a background worker when the application starts, so that when the user starts the form the queries will already be cached and execute fast directly. I however don't want to load the result of the queries over to the client as some users are working remotely or have otherwise slow networks. So I thought just executing the queries from a stored procedure and putting the results into temporary tables so that nothing would be returned. Turned out that some of the result sets are using dynamic columns so I couldn't create the corresponding temp tables and thus this isn't a solution. Do you happen to have any other idea?

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  • jQuery - script tags in the HTML are parsed out by jQuery and not executed

    - by Jose Jose
    I have an HTML page like so: <html> <body> <div id='something'> ... <script> var x = 'hello world'; </script> ... </div> </body> </html> On another page, I am doing this: $.ajax({ url: 'example.html', type: 'GET', success: function(data) { $('#mydiv').html($(data).find('#something').html()); alert(x); } }); jQuery, however, is not executing the javascript in the first file, even though the documentation says it does. How can I make it do that? EDIT: Unfortunately in the real world application I am working on I don't have control over what the "included" page has. We are on the same domain, but I can't modify the code that it outputs as it is a packaged product our IT department will not let us modify.

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  • c - strncpy issue

    - by Joe
    Hi there, I am getting segmentation fault when using strncpy and (pointer-to-struct)-(member) notation: I have simplified my code. I initialise a struct and set all of it's tokens to an empty string. Then a declare a pointer to a struct and assign the address of the struct to it. I pass the pointer to a function. I can print out the contents of the struct at the beginning of the function, but if I try to use the tp - mnemonic in a strncpy function, I get seg fault. Can anyone tell me what I am doing wrong? typedef struct tok { char* label; char* mnem; char* operand; }Tokens; Tokens* tokenise(Tokens* tp, char* line) { // This prints fine printf("Print this - %s\n", tp -> mnem); // This function gives me segmentation fault strncpy(tp -> mnem, line, 4); return tp; } int main() { char* line = "This is a line"; Tokens tokens; tokens.label = ""; tokens.mnem = "load"; tokens.operand = ""; Tokens* tp = &tokens; tp = tokenise(tp, line); return 0; } I have used printf statements to confirm that the code definitely stops executing at the strncpy function. Can anyone tell me where I am going wrong? Many thanks Joe

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  • How to solve non-linear equations using python

    - by stars83clouds
    I have the following code: #!/usr/bin/env python from scipy.optimize import fsolve import math h = 6.634e-27 k = 1.38e-16 freq1 = 88633.9360e6 freq2 = 88631.8473e6 freq3 = 88630.4157e6 def J(freq,T): return (h*freq/k)/(math.exp(h*freq/(k*T))-1) def equations(x,y,z,w,a,b,c,d): f1 = a*(J(freq1,y)-J(freq1,2.73))*(1-math.exp(-a*z))-(J(freq2,x)-J(freq2,2.73))*(1-math.exp(-z)) f2 = b*(J(freq3,w)-J(freq3,2.73))*(1-math.exp(-b*z))-(J(freq2,x)-J(freq2,2.73))*(1-math.exp(-z)) f3 = c*(J(freq3,w)-J(freq3,2.73))*(1-math.exp(-b*z))-(J(freq1,y)-J(freq1,2.73))*(1-math.exp(-a*z)) f4 = d*(J((freq3+freq1)/2,(y+w)/2)-J((freq3+freq1)/2,2.73))-(J(freq2,x)-J(freq2,2.73))*(1-math.exp(-z)) return (f1,f2,f3,f4) So, I have defined the equations in the above code. However, I now wish to solve the above set of equations using fsolve or other alternative non-linear numerical routine. I tried the following syntax but with no avail: x,y,z,w = fsolve(equations, (1,1,1,1)) I keep getting the error that "x" is not defined. I am executing all commands at the command-line, since I have no idea how to run a batch of commands as above automatically in python. I welcome any advice on how to solve this.

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  • Duplicate column name by JPA with @ElementCollection and @Inheritance

    - by gerry
    I've created the following scenario: @javax.persistence.Entity @Inheritance(strategy = InheritanceType.TABLE_PER_CLASS) public class MyEntity implements Serializable{ @Id @GeneratedValue protected Long id; ... @ElementCollection @CollectionTable(name="ENTITY_PARAMS") @MapKeyColumn (name = "ENTITY_KEY") @Column(name = "ENTITY_VALUE") protected Map<String, String> parameters; ... } As well as: @javax.persistence.Entity public class Sensor extends MyEntity{ @Id @GeneratedValue protected Long id; ... // so here "protected Map<String, String> parameters;" is inherited !!!! ... } So running this example, no tables are created and i get the following message: WARNUNG: Got SQLException executing statement "CREATE TABLE ENTITY_PARAMS (Entity_ID BIGINT NOT NULL, ENTITY_VALUE VARCHAR(255), ENTITY_KEY VARCHAR(255), Sensor_ID BIGINT NOT NULL, ENTITY_VALUE VARCHAR(255))": com.mysql.jdbc.exceptions.jdbc4.MySQLSyntaxErrorException: Duplicate column name 'ENTITY_VALUE' I also tried overriding the attributes on the Sensor class... @AttributeOverrides({ @AttributeOverride(name = "ENTITY_KEY", column = @Column(name = "SENSOR_KEY")), @AttributeOverride(name = "ENTITY_VALUE", column = @Column(name = "SENSOR_VALUE")) }) ... but the same error. Can anybody help me?

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  • showing null rows using join

    - by Pradyut Bhattacharya
    Hi, In mysql i m selecting from a table shouts having a foreign key to another table named "roleuser" with the matching column as user_id Now the user_id column in the shouts table for some rows is null (not actually null but with no inserts in mysql) How to show all the rows of the shouts table either with user_id null or not I m executing the sql statement SELECT s.*, r.firstname, r.lastname FROM shouts s left join roleuser r where r.user_id = s.user_id limit 50; which does not executes and shows You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near 'where r.user_id = s.user_id limit 50' at line 2 but using inner join the sql executes which shows rows which only have user_id values in the shouts table. the nulls are not shown. SELECT s.*, r.firstname, r.lastname FROM shouts s inner join roleuser r where r.user_id = s.user_id limit 50; How can i show all the rows from the shouts table and null values in the firstname and lastname columns where the user_id is null in the shouts table. If not at all possible with sql may be using stored procedures... Thanks Pradyut

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  • UTL_FILE.FOPEN() procedure not accepting path for directory ?

    - by Vineet
    I am trying to write in a file stored in c:\ drive named vin1.txt and getting this error .Please suggest! > ERROR at line 1: ORA-29280: invalid > directory path ORA-06512: at > "SYS.UTL_FILE", line 18 ORA-06512: at > "SYS.UTL_FILE", line 424 ORA-06512: at > "SCOTT.SAL_STATUS", line 12 ORA-06512: > at line 1 HERE is the code create or replace procedure sal_status ( p_file_dir IN varchar2, p_filename IN varchar2) IS v_filehandle utl_file.file_type; cursor emp Is select * from employees order by department_id; v_dep_no departments.department_id%TYPE; begin v_filehandle :=utl_file.fopen(p_file_dir,p_filename,'w');--Opening a file utl_file.putf(v_filehandle,'SALARY REPORT :GENERATED ON %s\n',SYSDATE); utl_file.new_line(v_filehandle); for v_emp_rec IN emp LOOP v_dep_no :=v_emp_rec.department_id; utl_file.putf(v_filehandle,'employee %s earns:s\n',v_emp_rec.last_name,v_emp_rec.salary); end loop; utl_file.put_line(v_filehandle,'***END OF REPORT***'); UTL_FILE.fclose(v_filehandle); end sal_status; execute sal_status('C:\','vin1.txt');--Executing

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