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  • Determine an object's class returned by a factory method (Error: function does not take 1 arguments

    - by tzippy
    I have a factorymethod that either returns an object of baseclass or one that is of derivedclass (a derived class of baseclass). The derived class has a method virtual void foo(int x) that takes one argument. baseclass however has virtual void foo() without an argument. In my code, a factory method returns a pointer of type bar that definetly points to an object of class derivedclass. However since this is only known at runtime I get a compiler error saying that foo() does not take an argument. Can I cast this pointer to a pointer of type derivedclass? std::auto_ptr<baseclass> bar = classfactory::CreateBar(); //returns object of class derivedclass bar->foo(5); class baseclass { public: virtual void foo(); } class derivedclass : public baseclass { public: virtual void foo(int x); }

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  • How can I define a method with multiple optional arguments in Obj-C

    - by The Dark Bug Returns
    I want to be able to update two sets of identical buttons with one function. Also I don't want to update all the buttons, only some of them. Can I have a function like this?: -(void) updateFields{ updateButton1 : (Bool) x updateButton2 : (Bool) y updateButton3 : (Bool) z } The implementation will look like this: [button1_1 setEnabled:x]; [button1_2 setEnabled:x]; //called only if updateButton1 is given an argument [button2_1 setEnabled:y]; etc...

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  • Are function arguments stored in a closure?

    - by Nick Lowman
    I was reading this great article about closures here and the example below outputs 'item3 undefined' three times. I understand why it outputs 'item3' three times as the functions inside buildList() all use the same single closure but why can't it access the 'list' argument? Why is it undefined? Is it because the argument is passed in after the closure has been created? function buildList(list) { var result = []; for (var i = 0; i < list.length; i++) { var item = 'item' + list[i]; result.push( function() {console.log(item + ' ' + list[i])} ); } return result; } function testList() { var fnlist = buildList([1,2,3]); // using j only to help prevent confusion - could use i for (var j = 0; j < fnlist.length; j++) { fnlist[j](); } }

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  • Executing in java code an external program that takes arguments

    - by rmaster
    Process p; String line; String path; String[] params = new String [3]; params[0] = "D:\\prog.exe"; params[1] = picA+".jpg"; params[2] = picB+".jpg"; try { p = Runtime.getRuntime().exec(params); BufferedReader input = new BufferedReader (new InputStreamReader(p.getInputStream())); while ((line = input.readLine()) != null) System.out.println(line); input.close(); } catch (IOException e) {System.out.println(" procccess not read"+e);} i don't get any error, just nothing in cmd.exe prog.exe is working fine What to improve in order to make this code working?

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  • Empty String API arguments for actionwebservice received as "SOAP::Mapping::Object" instead of ""

    - by user311985
    I've built an API using actionwebservice and when a client calls a method to pass in an empty string (""), it's to_s value is # instead of "". But when the client passes in "hello", it's to_s value is "hello". class UsersApiController < ApiController web_service_api UserApi def create_or_update(arg1) Rails.logger.info arg1.to_s # Displays "#<SOAP::Mapping::Object:0x3a89c08>" if arg1 is an empty string end end

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  • C++: Life span of temporary arguments?

    - by shoosh
    When creating a new instance of a MyClass as an argument to a function like so: class MyClass { MyClass(int a); }; myFunction(MyClass(42)); does the standard make any grantees on the timing of the destructor? Specifically, can I assume that the it is going to be called before the next statement after the call to myFunction() ?

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  • running jar file with multiple arguments in perl

    - by compiler9999
    Hi All, Im trying to run a jar file. this jar file will output multiple question in console manner, i want to eliminate the console and i need to input a value in order to proceed. e.g : A. Choose value 1 : [1] Windows [2] Unix Input : 2 B. Choose value 2 : [1] Oracle [2] DB2 Input : 1 Im trying : "java -jar program.jar < abc.txt" where abc.txt has a value of : 2 1 3 etc. but its not working its only getting the first value. please help. thanks. btw, ive also try : OPEN PIPE, "| java -jar program.jar"; open (FH, /abc.txt) print PIPE "$res"; close FH; close PIPE; Regards

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  • Passing partial arguments in tcshell

    - by R S
    Hey, I'm writing a shell script (tcsh) that is supposed to received 3 parameters or more. The first 3 are to be passed to a program, and the rest are supposed to be passed to another program. All in all the script should look something like: ./first_program $1 $2 $3 ./second program [fourth or more] The problem is that I don't know how to do the latter - pass all parameters that are after the third.

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  • Dynamic function arguments in C++, possible?

    - by Jeshwanth Kumar N K
    I am little new to C++, I have one doubt in variable argument passing. As I mentioned in a sample code below ( This code won't work at all, just for others understanding of my question I framed it like this), I have two functions func with 1 parameter and 2 parameters(parameter overloading). I am calling the func from main, before that I am checking whether I needs to call 2 parameter or 1 parameter. Here is the problem, as I know I can call two fuctions in respective if elseif statements, but I am curious to know whether I can manage with only one function. (In below code I am passing string not int, as I mentioned before this is just for others understanding purpose. #include<iostream.h> #include <string> void func(int, int); void func(int); void main() { int a, b,in; cout << "Enter the 2 for 2 arg, 1 for 1 arg\n"; cin << in; if ( in == 2) { string pass = "a,b"; } elseif ( in == 1) { string pass = "a"; } else { return 0; } func(pass); cout<<"In main\n"<<endl; } void func(int iNum1) { cout<<"In func1 "<<iNum1<<endl; } void func(int iNum1, int iNum2) { cout<<"In func2 "<<iNum1<<" "<<iNum2<<endl; }

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  • Ant command line arguments

    - by js7354
    Program works fine when run with eclipse run configurations, but when run with ant, it is unable to parse int from args[0], which I do not understand. Full code is available here https://gist.github.com/4108950/e984a581d5e9de889eaf0c8faf0e57752e825a97 I believe it has something to do with ant, target name="run" description="run the project"> java dir="${build.dir}" classname="BinarySearchTree" fork="yes"> <arg value="6 in.txt"/> /java> /target> the arg value will be changed via the -D flag, as in ant -Dargs="6 testData1.txt" run. Any help would be much appreciated, it is very frustrating.

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  • Should an Event that has no arguments define its own custom EventArgs or simply use System.EventArgs

    - by Mike Rosenblum
    I have an event that is currently defined with no event arguments. That is, the EventArgs it sends is EventArgs.Empty. In this case, it is simplest to declare my Event handler as: EventHandler<System.EventArgs> MyCustomEvent; I do not plan on adding any event arguments to this event, but it is possible that any code could need to change in the future. Therefore, I am leaning towards having all my events always create an empty event args type that inheretis from System.EventArgs, even if there are no event args currently needed. Something like this: public class MyCustomEventArgs : EventArgs { } And then my event definition becomes the following: EventHandler<MyCustomEventArgs> MyCustomEvent; So my question is this: is it better to define my own MyCustomEventArgs, even if it does not add anything beyond inheriting from System.EventArgs, so that event arguments could be added in the future more easily? Or is it better to explicitly define my event as returning System.EventArgs, so that it is clearer to the user that there are no extra event args? I am leaning towards creating custom event arguments for all my events, even if the event arguments are empty. But I was wondering if others thought that making it clearer to the user that the event arguments are empty would be better? Much thanks in advance, Mike

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  • Class initialization issues loading java.util.LogManager in Android Dalvik VM

    - by Freddy B. Rose
    I've done changes in an Android native library and installed a new system.img file but am now getting an unrelated Error on startup. I can get past it by swallowing the error but I wanted to know if anyone can explain what the issue is. The Android implementation of Logger.java claims that it is Forcing the LogManager to be initialized since its class init code performs necessary one-time setup. But this forced initialization results in a NoClassDefFoundError. I'm thinking that it has something to do with the class not having been preloaded by Zygote yet but am not that familiar with the whole class loaders and VM business. If anyone has some insight it would be greatly appreciated. Thanks. I/Zygote ( 1253): Preloading classes... D/skia ( 1253): ------ build_power_table 1.4 D/skia ( 1253): ------ build_power_table 0.714286 W/dalvikvm( 1253): Exception Ljava/lang/StackOverflowError; thrown during Ljava/util/logging/LogManager;. W/dalvikvm( 1253): Exception Ljava/lang/NoClassDefFoundError; thrown during Ljava/security/Security;. W/dalvikvm( 1253): Exception Ljava/lang/ExceptionInInitializerError; thrown during Landroid/net/http/HttpsConnection;. E/Zygote ( 1253): Error preloading android.net.http.HttpsConnection. E/Zygote ( 1253): java.lang.ExceptionInInitializerError E/Zygote ( 1253): at java.lang.Class.classForName(Native Method) E/Zygote ( 1253): at java.lang.Class.forName(Class.java:237) E/Zygote ( 1253): at java.lang.Class.forName(Class.java:183) E/Zygote ( 1253): at com.android.internal.os.ZygoteInit.preloadClasses(ZygoteInit.java:295) E/Zygote ( 1253): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:590) E/Zygote ( 1253): at dalvik.system.NativeStart.main(Native Method) E/Zygote ( 1253): Caused by: java.lang.ExceptionInInitializerError E/Zygote ( 1253): at javax.net.ssl.KeyManagerFactory$1.run(KeyManagerFactory.java:57) E/Zygote ( 1253): at javax.net.ssl.KeyManagerFactory$1.run(KeyManagerFactory.java:56) E/Zygote ( 1253): at java.security.AccessController.doPrivilegedImpl(AccessController.java:264) E/Zygote ( 1253): at java.security.AccessController.doPrivileged(AccessController.java:84) E/Zygote ( 1253): at javax.net.ssl.KeyManagerFactory.getDefaultAlgorithm(KeyManagerFactory.java:55) E/Zygote ( 1253): at org.apache.harmony.xnet.provider.jsse.SSLParameters.(SSLParameters.java:142) E/Zygote ( 1253): at org.apache.harmony.xnet.provider.jsse.SSLContextImpl.engineInit(SSLContextImpl.java:82) E/Zygote ( 1253): at android.net.http.HttpsConnection.initializeEngine(HttpsConnection.java:101) E/Zygote ( 1253): at android.net.http.HttpsConnection.(HttpsConnection.java:65) E/Zygote ( 1253): ... 6 more E/Zygote ( 1253): Caused by: java.lang.NoClassDefFoundError: java.util.logging.LogManager E/Zygote ( 1253): at java.util.logging.Logger.initHandler(Logger.java:419) E/Zygote ( 1253): at java.util.logging.Logger.log(Logger.java:1094) E/Zygote ( 1253): at java.util.logging.Logger.warning(Logger.java:906) E/Zygote ( 1253): at org.apache.harmony.luni.util.MsgHelp.loadBundle(MsgHelp.java:61) E/Zygote ( 1253): at org.apache.harmony.luni.util.Msg.getString(Msg.java:60) E/Zygote ( 1253): at java.io.BufferedInputStream.read(BufferedInputStream.java:316) E/Zygote ( 1253): at java.io.FilterInputStream.read(FilterInputStream.java:138) E/Zygote ( 1253): at java.io.BufferedInputStream.fillbuf(BufferedInputStream.java:157) E/Zygote ( 1253): at java.io.BufferedInputStream.read(BufferedInputStream.java:243) E/Zygote ( 1253): at java.util.Properties.load(Properties.java:302) E/Zygote ( 1253): at java.security.Security$1.run(Security.java:80) E/Zygote ( 1253): at java.security.Security$1.run(Security.java:67) E/Zygote ( 1253): at java.security.AccessController.doPrivilegedImpl(AccessController.java:264) E/Zygote ( 1253): at java.security.AccessController.doPrivileged(AccessController.java:84) E/Zygote ( 1253): at java.security.Security.(Security.java:66) E/Zygote ( 1253): ... 15 more W/dalvikvm( 1253): threadid=3: thread exiting with uncaught exception (group=0x2aac6170)

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  • Class initialization issues loading java.util.logging.LogManager in Android Dalvik VM

    - by Freddy B. Rose
    I've done changes in an Android native library and installed a new system.img file but am now getting an unrelated Error on startup. I can get past it by swallowing the error but I wanted to know if anyone can explain what the issue is. The Android implementation of Logger.java claims that it is Forcing the LogManager to be initialized since its class init code performs necessary one-time setup. But this forced initialization results in a NoClassDefFoundError. I'm thinking that it has something to do with the class not having been preloaded by Zygote yet but am not that familiar with the whole class loaders and VM business. If anyone has some insight it would be greatly appreciated. Thanks. I/Zygote ( 1253): Preloading classes... D/skia ( 1253): ------ build_power_table 1.4 D/skia ( 1253): ------ build_power_table 0.714286 W/dalvikvm( 1253): Exception Ljava/lang/StackOverflowError; thrown during Ljava/util/logging/LogManager;. W/dalvikvm( 1253): Exception Ljava/lang/NoClassDefFoundError; thrown during Ljava/security/Security;. W/dalvikvm( 1253): Exception Ljava/lang/ExceptionInInitializerError; thrown during Landroid/net/http/HttpsConnection;. E/Zygote ( 1253): Error preloading android.net.http.HttpsConnection. E/Zygote ( 1253): java.lang.ExceptionInInitializerError E/Zygote ( 1253): at java.lang.Class.classForName(Native Method) E/Zygote ( 1253): at java.lang.Class.forName(Class.java:237) E/Zygote ( 1253): at java.lang.Class.forName(Class.java:183) E/Zygote ( 1253): at com.android.internal.os.ZygoteInit.preloadClasses(ZygoteInit.java:295) E/Zygote ( 1253): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:590) E/Zygote ( 1253): at dalvik.system.NativeStart.main(Native Method) E/Zygote ( 1253): Caused by: java.lang.ExceptionInInitializerError E/Zygote ( 1253): at javax.net.ssl.KeyManagerFactory$1.run(KeyManagerFactory.java:57) E/Zygote ( 1253): at javax.net.ssl.KeyManagerFactory$1.run(KeyManagerFactory.java:56) E/Zygote ( 1253): at java.security.AccessController.doPrivilegedImpl(AccessController.java:264) E/Zygote ( 1253): at java.security.AccessController.doPrivileged(AccessController.java:84) E/Zygote ( 1253): at javax.net.ssl.KeyManagerFactory.getDefaultAlgorithm(KeyManagerFactory.java:55) E/Zygote ( 1253): at org.apache.harmony.xnet.provider.jsse.SSLParameters.(SSLParameters.java:142) E/Zygote ( 1253): at org.apache.harmony.xnet.provider.jsse.SSLContextImpl.engineInit(SSLContextImpl.java:82) E/Zygote ( 1253): at android.net.http.HttpsConnection.initializeEngine(HttpsConnection.java:101) E/Zygote ( 1253): at android.net.http.HttpsConnection.(HttpsConnection.java:65) E/Zygote ( 1253): ... 6 more E/Zygote ( 1253): Caused by: java.lang.NoClassDefFoundError: java.util.logging.LogManager E/Zygote ( 1253): at java.util.logging.Logger.initHandler(Logger.java:419) E/Zygote ( 1253): at java.util.logging.Logger.log(Logger.java:1094) E/Zygote ( 1253): at java.util.logging.Logger.warning(Logger.java:906) E/Zygote ( 1253): at org.apache.harmony.luni.util.MsgHelp.loadBundle(MsgHelp.java:61) E/Zygote ( 1253): at org.apache.harmony.luni.util.Msg.getString(Msg.java:60) E/Zygote ( 1253): at java.io.BufferedInputStream.read(BufferedInputStream.java:316) E/Zygote ( 1253): at java.io.FilterInputStream.read(FilterInputStream.java:138) E/Zygote ( 1253): at java.io.BufferedInputStream.fillbuf(BufferedInputStream.java:157) E/Zygote ( 1253): at java.io.BufferedInputStream.read(BufferedInputStream.java:243) E/Zygote ( 1253): at java.util.Properties.load(Properties.java:302) E/Zygote ( 1253): at java.security.Security$1.run(Security.java:80) E/Zygote ( 1253): at java.security.Security$1.run(Security.java:67) E/Zygote ( 1253): at java.security.AccessController.doPrivilegedImpl(AccessController.java:264) E/Zygote ( 1253): at java.security.AccessController.doPrivileged(AccessController.java:84) E/Zygote ( 1253): at java.security.Security.(Security.java:66) E/Zygote ( 1253): ... 15 more W/dalvikvm( 1253): threadid=3: thread exiting with uncaught exception (group=0x2aac6170)

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  • Simple python oo issue

    - by Alex K
    Hello, Have a look a this simple example. I don't quite understand why o1 prints "Hello Alex" twice. I would think that because of the default self.a is always reset to the empty list. Could someone explain to me what's the rationale here? Thank you so much. class A(object): def __init__(self, a=[]): self.a = a o = A() o.a.append('Hello') o.a.append('Alex') print ' '.join(o.a) # >> prints Hello Alex o1 = A() o1.a.append('Hello') o1.a.append('Alex') print ' '.join(o1.a) # >> prints Hello Alex Hello Alex

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  • Problem in Eclipse 3.5 and ubuntu 9.10

    - by ki0
    Someone knows why eclipse close when i click any button. This is because when i try to do something, update eclipse or whatever, eclipse close and it gives me this log... # # A fatal error has been detected by the Java Runtime Environment: # # SIGSEGV (0xb) at pc=0x00007fc329864f7a, pid=9392, tid=140476827293968 # # JRE version: 6.0_16-b01 # Java VM: Java HotSpot(TM) 64-Bit Server VM (14.2-b01 mixed mode linux-amd64 ) # Problematic frame: # C [libpango-1.0.so.0+0x24f7a] pango_layout_new+0x2a # # If you would like to submit a bug report, please visit: # http://java.sun.com/webapps/bugreport/crash.jsp # The crash happened outside the Java Virtual Machine in native code. # See problematic frame for where to report the bug. # I think it is something about java, anyone has any solution?¿ Thanks

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  • OutOfMemoryError: Java heap space error when start solr

    - by Hamid
    Hi I start indexing DB articles with solr, but after add about 58 million article (and about 113 GB size of disk) , i get below error message on tomcat log error Note1: i already set Init memory pool to 256MB, and Max memory pool:1400MB to tomcat server. Note2: I can post or search article but must wait over 3 min for get response. 8-apr-2010 14:27:07 org.apache.solr.common.SolrException log SEVERE: java.lang.OutOfMemoryError: Java heap space at org.apache.lucene.util.PriorityQueue.initialize(PriorityQueue.java:89) at org.apache.lucene.search.HitQueue.<init>(HitQueue.java:67) at org.apache.lucene.search.TopScoreDocCollector.<init>(TopScoreDocCollector.java:113) at org.apache.lucene.search.TopScoreDocCollector.<init>(TopScoreDocCollector.java:37) at org.apache.lucene.search.TopScoreDocCollector$InOrderTopScoreDocCollector.<init>(TopScoreDocCollector.java:42) at org.apache.lucene.search.TopScoreDocCollector$InOrderTopScoreDocCollector.<init>(TopScoreDocCollector.java:40) at org.apache.lucene.search.TopScoreDocCollector.create(TopScoreDocCollector.java:100) at org.apache.solr.search.SolrIndexSearcher.getDocListNC(SolrIndexSearcher.java:979) at org.apache.solr.search.SolrIndexSearcher.getDocListC(SolrIndexSearcher.java:884) at org.apache.solr.search.SolrIndexSearcher.search(SolrIndexSearcher.java:341) at org.apache.solr.handler.component.QueryComponent.process(QueryComponent.java:182) at org.apache.solr.handler.component.SearchHandler.handleRequestBody(SearchHandler.java:195) at org.apache.solr.handler.RequestHandlerBase.handleRequest(RequestHandlerBase.java:131) at org.apache.solr.core.SolrCore.execute(SolrCore.java:1316) at org.apache.solr.servlet.SolrDispatchFilter.execute(SolrDispatchFilter.java:338) at org.apache.solr.servlet.SolrDispatchFilter.doFilter(SolrDispatchFilter.java:241) at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:235) at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206) at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:233) at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:191) at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:128) at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:102) at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:109) at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:293) at org.apache.coyote.http11.Http11AprProcessor.process(Http11AprProcessor.java:859) at org.apache.coyote.http11.Http11AprProtocol$Http11ConnectionHandler.process(Http11AprProtocol.java:574) at org.apache.tomcat.util.net.AprEndpoint$Worker.run(AprEndpoint.java:1527) at java.lang.Thread.run(Unknown Source) What's problem ? Have any suggestion ? Thanks in advanced

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  • Huge anon blocks in pmap

    - by Parik
    I am doing a pmap on a tomcat process and I am seeing some huge anon blocks. From what I read anon blocks are used for thread stacks and for JNI. I have a very moderate thread count. How can I go about finding out what is causing these huge anon blocks? 00000000ee0d0000 26752K rwx-- [ anon ] 00000000efaf0000 33792K rwx-- [ anon ] 00000000f1bf0000 25856K rwx-- [ anon ] 00000000f3530000 39680K rwx-- [ anon ] ( on a side note is pmap the correct way to measure how much memory is allocated to tomcat?)

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  • Heap Dump Root Classes

    - by Adnan Memon
    We have production system going into infinite loop of full gc and memory drops form 8 gigs to like 1 MB in just 2 minutes. After taking heap dump it tells me there an is an array of java.lang.Object ([Ljava.lang.Object) with millions of java.lang.String objects having same String taking 99% of heap. But it doesn't tell me which class is referencing to this array so that I can fix it in the code. I took the heap dump using jmap tool on JDK 6 and used JProfiler, NetBeans, SAP Memory Analyzer and IBM Memory Analyzer but none of those tell me what is causing this huge array of objects?? ... like what class is referencing to it or contains it. Do I have to take a different dump with different config in order to get that info? ... Or anything else that can help me find out the culprit class causing this ... it will help a lot.

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  • jna call to kernel32.CreateToolhelp32Snapshot in shutdown hook crashes the VM

    - by jumar
    If a thread sets a shutdown hook using Runtime.getRuntime().addShutdownHook(); calls via jna the method: kernel32.CreateToolhelp32Snapshot (0x00000002, 0) it crashes the VM. If I call the same method in the WindowListener.windowClosing() hook, the call does not crashes the VM. Any idea why? I can post part of the VM crash error report if it could be of any use. edit: see the VM crash report on pastebin

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  • C# and T-SQL command-line Utility

    - by Chad Sellers
    Group, Part 1: I'm currently working on a command line utility that can take args and update a local database. The only issue I have is once i established a "Data connection"..how can I use those args for queries and searches. For example: ~//arrInput.exe "parm1" "pram2" "pram3" Part 2: I would like to take in command line args and use them as input parms for a "stored proc". Once finished execution....used the same inputs crate a log file. For example output file: mm-dd-yyyy hh:mm:ss - pram1,pram2,... pram1: updated/failed pram2: update/failed Thanks, Chad

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