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  • Linking ?++ - BDB - LNK2001

    - by MInner
    BDB is compiled on the same PC, under same VS. #include <db_cxx.h> int main(){ Db b(NULL, 0); return 0; } 1main.obj : error LNK2001: unresolved external symbol ""public: virtual __thiscall Db::~Db(void)" (??1Db@@UAE@XZ)" 1main.obj : error LNK2001: unresolved external symbol ""public: __thiscall Db::Db(class DbEnv *,unsigned int)" (??0Db@@QAE@PAVDbEnv@@I@Z)" what could be wrong?

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  • What is the function definition for member?

    - by NHans
    (define (member atom list) (cond ((null? list) '()) (= atom (car list) "True") (else (member atom(cdr list))) ) ) (member '5 '(1 2 3 4 5)) Always it gives true even though that atom isn't a member in the list. Could you plz help me to clarify this question as soon as possible.

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  • How to detect invalid image URL with JAVA?

    - by Cataclysm
    I have a method to download image from URL. As like below.. public static byte[] downloadImageFromURL(final String strUrl) { InputStream in; ByteArrayOutputStream out = new ByteArrayOutputStream(); try { URL url = new URL(strUrl); in = new BufferedInputStream(url.openStream()); byte[] buf = new byte[2048]; int n = 0; while (-1 != (n = in.read(buf))) { out.write(buf, 0, n); } out.close(); in.close(); } catch (IOException e) { return null; } return out.toByteArray(); } I have an image url and it is valid. for example. https://encrypted-tbn1.gstatic.com/images?q=tbn:ANd9GcTxfYM-hnD-Z80tgWdIgQKchKe-MXVUfTpCw1R5KkfJlbRbgr3Zcg My problem is I don't want to download if image is really not exists.Like .... https://encrypted-tbn1.gstatic.com/images?q=tbn:ANd9GcTxfYM-hnD-Z80tgWdIgQKchKe-MXVUfTpCw1R5KkfJlbRbgr3Zcgaaaaabbbbdddddddddddddddddddddddddddd This image shouldn't be download by my method. So , how can I know the giving image URL is not really exists. I don't want to validate my URL (I think that may not my solution ). So, I googled for that. From this article ... How to check if a URL exists or returns 404 with Java? and Java check if file exists on remote server using its url But this con.getResponseCode() will always return status code "200". This mean my method will also download invalid image urls. So , I output my bufferStream as like... System.out.println(in.read(buf)); Invalid image URL produces "43". So , I add these lines of codes in my method. if (in.read(buf) == 43) { return null; } It is ok. But I don't think that will always satisfy. Has another way to get it ? am I right? I would really appreciate any suggestions. This problem may struct my head. Thanks for reading my question.

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  • # character seems to cause problems with a get Request

    - by Ankur
    I have a queryString that I pass to a servlet's doGet() method that looks like this: count=9&preId0=-99&objId0=-99&preId1=-99&objId1=-99&preId2=69&objId2=16#!78&preId3=-99&objId3=-99&preId4=-99&objId4=-99&preId5=-99&objId5=-99&preId6=-99&objId6=-99&preId7=-99&objId7=-99&preId8=-99&objId8=-99 After and including the # everything is null, so I am assuming the # has some special meaning. Is this true? and are there other such characters that will do this?

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  • What values do the walkback array in the SocketException contain?

    - by akhilss
    Recently I have debugging into a problem where a connection to a database server from the application server get reset. I am pretty sure there is no reset being called from either end. But while I was debugging into the problem, while inspecting the SocketException, I found the walkback variable. arg0 SocketException (id=11532) cause SocketException (id=11532) detailMessage "Connection reset" stackTrace null walkback long[50] (id=11618) What do the values in this variable represent?

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  • Cannot get document.getElementByID to work

    - by user1804234
    The following function doesn't work for some reason. Can someone see what the problem is? function checkMaxLen(txt, maxLen) { var actualLen = txt.value.length; var remain = maxLen - actualLen; document.getElementById('remainChar').Value = remain; } <input type="text" id="remainChar" runat="server" value="500"/> Whenever I try to run the function, I get this error: Microsoft JScript runtime error: Unable to set value of the property 'Value': object is null or undefined

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  • fast load big object graph from DB

    - by Famos
    Hi I have my own data structure written in C# like: public class ElectricScheme { public List<Element> Elements { get; set; } public List<Net> Nets { get; set; } } public class Element { public string IdName { get; set; } public string Func { get; set; } public string Name { get; set; } public BaseElementType Type { get; set; } public List<Pin> Pins { get; set; } } public class Pin { public string IdName { get; set; } public string Name { get; set; } public BasePinType PinType { get; set; } public BasePinDirection PinDirection { get; set; } } public class Net { public string IdName { get; set; } public string Name { get; set; } public List<Tuple<Element,Pin>> ConnectionPoints { get; set; } } Where Elements count ~19000, each element contain =3 Pin, Nets count ~20000, each net contain =3 pair (Element, Pin) Parse txt (file size ~17mb) file takes 5 minutes. Serilization / Deserialization by default serializer ~3 minutes. Load from DB 20 minutes and not loaded... I use Entity Framework like public ElectricScheme LoadScheme(int schemeId) { var eScheme = (from s in container.ElectricSchemesSet where s.IdElectricScheme.Equals(schemeId) select s).FirstOrDefault(); if (eScheme == null) return null; container.LoadProperty(eScheme, "Elements"); container.LoadProperty(eScheme, "Nets"); container.LoadProperty(eScheme, "Elements.Pins"); return eScheme; } The problem is dependencies between Element and Pin... (for ~19000 elements ~95000 pins) Any ideas?

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  • Slow query execution time

    - by rotor
    select p.id,p.title,p.slug,p.content, (select url from gallery where postid=p.id limit 1) as url, t.name from posts as p inner join termrel as tr on (tr.object = p.id) inner join termtax as tx on (tx.id = tr.termtax_id) inner join terms as t on (t.id = tx.term_id) where tx.taxonomy_id=3 and p.post_status is null order by t.name asc This query took about 0.2407s to execute. How to make it fast?

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  • How to dispose BackgroundWorkers the right way

    - by radbyx
    I've got a Windows Service that runs BackgroundWorker's, and I'm wondering if I'm doing the right thing when I stop my Windows Service. Is it enough to: Let the BackgroundWorker1_DoWork method complete (I have a while loop in it now, doing some tasks) Set the variable that holds the reference to the BackgroundWorker, to null Is there some kind of Dispose() method I need to call (In the same way the Timer class has Timer.Dispose();)?

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  • how can we set the property of Viewstate?

    - by subodh
    I am using a enum public enum WatchUsageMode { Watch = 1, EmailPreferences = 2 } i want to set the property of that enum in my view state in such a way that whenever view state is null return Watch else EmailPreference.how can i set the property?

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  • Constructors from extended class in Java

    - by Crystal
    I'm having some trouble with a hw assignment. In one assignment, we had to create a Person class. Mine was: public class Person { String firstName; String lastName; String telephone; String email; public Person() { firstName = ""; lastName = ""; telephone = ""; email = ""; } public Person(String firstName) { this.firstName = firstName; } public Person(String firstName, String lastName, String telephone, String email) { this.firstName = firstName; this.lastName = lastName; this.telephone = telephone; this.email = email; } public String getFirstName() { return firstName; } public void setFirstName(String firstName) { this.firstName = firstName; } public String getLastName() { return lastName; } public void setLastName(String lastName) { this.lastName = lastName; } public String getTelephone() { return telephone; } public void setTelephone(String telephone) { this.telephone = telephone; } public String getEmail() { return email; } public void setEmail(String email) { this.email = email; } public boolean equals(Object otherObject) { // a quick test to see if the objects are identical if (this == otherObject) { return true; } // must return false if the explicit parameter is null if (otherObject == null) { return false; } if (!(otherObject instanceof Person)) { return false; } Person other = (Person) otherObject; return firstName.equals(other.firstName) && lastName.equals(other.lastName) && telephone.equals(other.telephone) && email.equals(other.email); } public int hashCode() { return 7 * firstName.hashCode() + 11 * lastName.hashCode() + 13 * telephone.hashCode() + 15 * email.hashCode(); } public String toString() { return getClass().getName() + "[firstName = " + firstName + '\n' + "lastName = " + lastName + '\n' + "telephone = " + telephone + '\n' + "email = " + email + "]"; } } Now we have to extend that class and use that class in our constructor. The function protoype is: public CarLoan(Person client, double vehiclePrice, double downPayment, double salesTax, double interestRate, CAR_LOAN_TERMS length) I'm confused on how I use the Person constructor from the superclass. I cannot necessarily do super(client); in my constructor which is what the book did with some primitive types in their example. Not sure what the correct thing to do is... Any thoughts? Thanks!

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  • What is the explanation of this java code ?

    - by M.H
    I have the following code : public class Main { public void method(Object o) { System.out.println("Object Version"); } public void method(String s) { System.out.println("String Version"); } public static void main(String args[]) { Main question = new Main(); question.method(null);//1 } } why is the result is "String Version" ? and why there is a compiler error if the first method takes a StringBuffer object ?

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  • freeing a memory twice

    - by benjamin button
    Hi, AFAIAK, freeing a NULL will result in nothing.i mean nothing is being done by the compiler/no functionality is performed. Still i do see some statements where people say that one of the scenario,where a memory corruption can occur is "freeing a memory twice"? Is this still true?

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  • MySQL greatest value in row?

    - by noryb009
    Hi! I'm using MySQL with PHP. This is like my table: (I'm using 3 values, but there are more) id | 1 | 2 | 3 1 | 3 |12 |-29 2 | 5 |8 |8 3 | 99|7 |NULL I need to get the greatest value in a certain row. If should get: (id - output) (1 - 2), (2-2), (3-1). Is there any queries for this? I've been trying, but I can't get it to work right.

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  • Check the value from DBand pass it to next page

    - by user554176
    I have a field ,if user enters data it should go and check db if it is present it should redirect to next page. But here i m not sure whether it is checking the db but mysql query is correct. $ThirdPartyCategoryName =$_POST['ThirdPartyCategoryName']; $activate = mysql_query("SELECT * FROM `thirdpartycategorymaster` WHERE `delete` = 'y' "); if($activate=='y') { header("location:catact.php"); } else { //$activate=='NULL'; header("location:tp_home.php"); }

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  • C++ question on file formats and od

    - by user231536
    I have the following simple code: ofstream output("test"); output << 'a'; When I do an octal dump of the file, I get this: 0000000 000141 0000001 I can see that 000141 (in base 8) is 8 bits wide and 0000001 is probably EOF. What is the first byte of all 0's and why is it there? I know it is null is ascii but what is its purpose?

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