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• HP Wireless Printer not working

  - by Omri Spector

  I have installed an HP DeskJet 4620 driver on a win 7 machine. All works perfectly for several days, and than printing is not longer possible. Instead I get the message: "Unable to communicate with printer". This happened on every Win 7 PC I tried, and none of the HP/MS sites contain any relevant info... (Posting this so that the answer appears online, as I did solve it after much work) Solution: It appears that HP installation puts a unique "port" called "HP Network re-discovery". It stops working after some time (possibly after the first time the printer/pc enter sleep mode). BUT, the standard MS TCP port works just fine. So: Go to "Printers" Right click Printer Click "Printer properties" and then "Printer" or "Fax" (for both - do all this twice) Click "Add Port..." Select "Standard TCP Port" Fill in details Move printer to use the new port by un-checking the old one and checking the new one Happy printing.

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• django forms from two tables referencial integrity

  - by dana

  i have a class named cv,and a class named university, and each user that completes his cv, should choose a University he studyes at. My problem is: one student can study at one or 2 or three universities, or may be a user that is not student. I need to take this data into a form, and i use ModelForm. The data from the Cv class, and from the University class in the same form, and the user can add one or more universities, or no university. (in the same form) How should i do it? Should i use ModelForm? if i have a foreign key in the CV class, and the user is not a student (so he is at zero universities), i may get an referencial integrity error. thanks a lot

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• Is there a work-around that allows missing data to equal NULL for LOAD DATA INFILE in MySQL?

  - by richardh

  I have a lot of large csv files with NULL values stored as ,, (i.e., no entry). After a lot of searching I found that this is a known "bug", although it may be a feature for some users. Is there a way that I can fix this on the fly without pre-processing? These data are all numeric, so a zero value is very different from NULL. Or if I have to do pre-processing, is there one that is most promising for dealing with tens of csv files of 100mb to 1gb? Thanks!

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• Visit neighbor of a position in a 2d-array

  - by Martin

  I have the following two dimensional array: static int[,] arr = new int[5, 5] { { 00, 00, 00, 01, 00 }, { 00, 00, 01, 01, 00 }, { 00, 00, 01, 01, 00 }, { 00, 00, 01, 01, 00 }, { 00, 00, 00, 01, 00 }, }; I have to a implement a method called Hit(int x, int y). When we hit a 0 in the array (i.e. Hit(0, 0), Hit(1, 1), but not Hit(3, 0)) I would like all the adjacent zeros to the zero we hit to be incremented by 10. So if I call Hit(1, 1), the array should become the following. static int[,] arr = new int[5, 5] { { 10, 10, 10, 01, 00 }, { 10, 10, 01, 01, 00 }, { 10, 10, 01, 01, 00 }, { 10, 10, 01, 01, 00 }, { 10, 10, 10, 01, 00 }, }; Any idea how I could implement that? It sounds to me like a Depth First Search/Recursive sort-of algorithm should do the job, but I haven't been able to implement it for an 2d array. Thanks for the help!

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• What's Your favorite f# use? where does f# makes life (a lot) easier (compared to c#)?

  - by luckyluke

  I've skimmed the stack and did not get the overflow as there is probably no such question. I'm just learning f# and I am A seasoned c# and .net dev. I am into financial apps and currently F# helps me a lot with maths calcs like zero finding or minimum finding (although I still want some good maths library there). I see that processing multiple items (files or smth) tends to be easier, but my GUI (web, win) are still c# based. I am in the team of 5 devs and we know that the new tool is out, we are learning it after hours (to pimp ourselves up) but maybe we shouldn't bash the door somebody already opened. So in business apps, whats Your first killer part of soft You would code in F# (if You could and would know IT would be easier, faster, more testable, easier to maintain etc.? Business rules? ImageProcessing? Data processing? hope it's not to subjective. luke

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• NetNamedPipe: varying response time when communication is idling

  - by Sven Künzler

  I have two WCF apps communicating one-way over named pipes. All is nice, except for one thing: Normally, the request/response cycle takes zero (marginal) time. However, if there was a time span of, say, half a minute without any communication, the request/response increases up to ~300-500ms. I looked around the net and I got the idea of using a heart beat/ping mechanism to keep the communication channel busy. Using trial and error I found that when doing a request each 10 seconds, the response times stay low. Starting at around 15s intervals, the "hiccup" response times begin to appear. Now I'm wondering where this phenomenon is originating from. I tried setting alle conceivable timeouts on both sides to 1 minute, but that did not help. Can anybody explain what's going on there?

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• Extend university wifi network

  - by asfasdoiuh ouhouhouh

  i live in a university campus and i can get wifi signal on the outside of my window but not in the house. The solution i use at the moment is a usb wifi dongle outside connected to my laptop but the lack of an internal antenna make the connection quite unreliable at times. So i was trying to find another solution to improve the reception of my network. One idea is to setup a router on the outside (in a place with stronger signal) and redirect the connection inside the house with an ethernet cable but the problem is that our Uni Wifi is managed by a capitve portal (BlueSocket with DNS redirection to login page) and the authentication has to happen on the mac address that connect to the net (so the client appliance in this case). If I use a router with Mac-Clone capability i will be able to be redirected trough the captive portal on my laptop computer and login from there or i need to setup my router to fill in the login page by itself? There are other hardware/software solutions i can use to get what i want?

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• How to use SQL trigger to record the affected column's row number

  - by Freeman

  I want to have an 'updateinfo' table in order to record every update/insert/delete operations on another table. In oracle I've written this: CREATE TABLE updateinfo ( rnumber NUMBER(10), tablename VARCHAR2(100 BYTE), action VARCHAR2(100 BYTE), UPDATE_DATE date ) DROP TRIGGER TRI_TABLE; CREATE OR REPLACE TRIGGER TRI_TABLE AFTER DELETE OR INSERT OR UPDATE ON demo REFERENCING NEW AS NEW OLD AS OLD FOR EACH ROW BEGIN if inserting then insert into updateinfo(rnumber,tablename,action,update_date ) values(rownum,'demo', 'insert',sysdate); elsif updating then insert into updateinfo(rnumber,tablename,action,update_date ) values(rownum,'demo', 'update',sysdate); elsif deleting then insert into updateinfo(rnumber,tablename,action,update_date ) values(rownum,'demo', 'delete',sysdate); end if; -- EXCEPTION -- WHEN OTHERS THEN -- Consider logging the error and then re-raise -- RAISE; END TRI_TABLE; but when checking updateinfo, all rnumber column is zero. is there anyway to retrieve the correct row number?

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• How to add an image as a full-page background in Word 2010

  - by Oak

  I'm trying to add an image as a full-page background in word. I've tried page layout -> page color -> fill effect -> picture which looks fine in the preview (though when I try to zoom in or out it no longer looks the same), but when printing it tiled the image instead of just showing it once. I've tried insert -> picture and then setting it to "behind text" and settings its location to (0,0), but then when trying to change the image size the "relative" option is greyed out, so I can't set it to 100% of page size: I guess I can set it manually to the page size, but is there another, simpler way to just set a single image as a background?

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• How do I specify a null relation in SQLAlchemy?

  - by Jesse

  Not sure what the correct title for this question should be. I have the following schema: Matters have a one-many relationship to WorkItems. WorkItems have a one-one (or one-zero) relationship to LineItems. I am trying to create the following relation between Matters and WorkItems Matter.unbilled_work_items = orm.relation(WorkItem, primaryjoin = (Matter.id == WorkItem.matter_id) and (WorkItem.line_item_id == None), foreign_keys = [WorkItem.matter_id, WorkItem.line_item_id], viewonly=True ) This throws: AttributeError: '_Null' object has no attribute 'table' That seems to be saying that the second clause in the primaryjoin returns an object of type _Null, but it seems to be expecting something with a "table" attribute. This seems like it should be pretty straightforward to me, am I missing something obvious?

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• Photoshop changes colors when moved to a different monitor

  - by Jason

  This Yahoo! answers question pretty much sums up my predicament. Unfortunately I haven't really found an actual answer. Here's a screen shot of what happens when I place Photoshop between my monitors. Imagine that the left side of my laptop is the right square and the yellow is the right side of my monitor. When I move the program to one side fully or the other, it takes on the corresponding color. Obviously the color on the right is correct and Photoshop is changing the color of the image when it moves to my external monitor. Also notice how none of the tools or anything are different colors, just the actual image itself. How do I fix this? EDIT You may also notice that the color palette in the left corner is showing that yellow tinge. I didn't actually pick that yellow color, it's supposed to be showing the grey on the left that I used to fill in the square.

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• C static variables and intialization

  - by yCalleecharan

  Hi, If I have a global static variable x like in this code #include <stdio.h> #include <stdio.h> static int x; int main(void) { DO SOMETHING WITH x HERE x++; } What will be difference if I opted to initialize x to a value first say as in static int x = 0; before entering "main"? In my first case where I didn't assign a value to x, does the compiler implicitly know that x is to be set to zero as it's a static variable? I heard that we can do this with static variables. Thanks a lot...

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• COUNT issue across multiple tables

  - by Kim

  I am trying to count across 2 tables and I dont see whats wrong with my query yet I get a wrong result. User 2 does not exist in table_two, so the zero is correct. SELECT t1.creator_user_id, COUNT(t1.creator_user_id), COUNT(t2.user_id) FROM table_one AS t1 LEFT JOIN table_two AS t2 ON t2.user_id = t1.creator_user_id GROUP BY t1.creator_user_id, t2.user_id Actual result 1 192 192 2 9 0 Expected result 1 16 12 2 9 0 The result indicate a missing group by condition, but I already got both fields used. Where am I wrong ? Also, can I sum up all users that doesnt exist in table_two for t1 ? Like user 3 exists 21 times in t1, then the results would be: 1 16 12 (users with > 0 in t2 will need their own row) 2 30 0 (user 2=9 + user 3=21 => 30) Its okay for the user Id to be wrong for sum of t1 for all users with 0 in t2. If not possible, then I'll just do two queries.

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• A Combinations of Items in Given List

  - by mecablaze

  Hello stackoverflow, I'm currently in Python land. This is what I need to do. I have already looked into the itertools library but it seems to only do permutations. I want to take an input list, like ['yahoo', 'wikipedia', 'freebase'] and generate every unique combination of one item with zero or more other items... ['yahoo', 'wikipedia', 'freebase'] ['yahoo', 'wikipedia'] ['yahoo', 'freebase'] ['wikipedia', 'freebase'] ['yahoo'] ['freebase'] ['wikipedia'] A few notes. Order does not matter and I am trying to design the method to take a list of any size. Also, is there a name for this kind of combination? Thanks for your help!

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• Maximizing after moving RDC window between different size monitors

  - by msorens

  My Win7 system has two monitors of different sizes. When I open a Remote Desktop Connection on one monitor set to use full screen, both the RDC window and the remote system's desktop fills the monitor. If I then move the window onto my second monitor (1-Restore Down button to make it movable; 2-Drag window to other monitor; 3-Maximize button to fill monitor) the RDC window fills the monitor, but the remote system's desktop remains the same size it was before. Thus, if I move from the larger to the smaller monitor I have scrollbars to see the whole remote desktop, while if I move from the smaller to the larger monitor the remote desktop occupies only a portion of the monitor. My workaround is to close the RDC window completely then re-establish it on the other monitor. Is there a way to avoid this overhead and just resize the remote desktop to fit?

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• mysql 5.1 - innodb - query_cache_size - 9,418,108 queries have been removed from the query cache due to lack of memory

  - by Tom C

  Currently running on a 16GB system - Ubuntu 64 bit. INnodb Buffer Pool is set to 10GB. tuning-primer shows the following: QUERY CACHE Query cache is enabled Current query_cache_size = 512 M Current query_cache_used = 501 M Current query_cache_limit = 4 M Current Query cache Memory fill ratio = 97.87 % Current query_cache_min_res_unit = 4 K However, 9418108 queries have been removed from the query cache due to lack of memory Perhaps you should raise query_cache_size That is over 9million queries removed. System uptime is 8 days. Should I remove the Query Cache altogether? Our db is always under heavy I/O. tia

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• OpenCv not initializing usb camera

  - by brainbarshan

  I am trying to capture video from usb camera using OpenCv. #include <highgui.h> #include <iostream> using namespace std; using namespace cv ; int main() { VideoCapture cap (-1); if(!cap.isOpened()) cout << "Cam initialize failed" ; else cout << "Cam initialized" ; return 0; } It is failing to initialize the camera. cap.isOpened() is returning zero. The same program, with same version of OpenCv and same usb camera, is correctly running in my friend's machine. I am running fedora 16. I did some searching in Google and Stack Overflow. But no useful help. Any idea ?

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• Passing extended parameter into Sql 2008 connection string

  - by Pita.O

  Hi, I have a need to support extensive auditing capabilities for a system backing into Sql Server 2008. Since I plan to use LINQ (with no Stored Procs), the database would be a clean, zero contact data repository. However, I need to pratically record a snapshot of every change that happens in the db. So, I thought I should use triggers. But then, I need a user id for the particular user (not the connection string user id) to flow through into the database. In oracle, I should have been able to set up a PROXY USER and the trigger would be able to pick that up. Last I checked, there was no proxy user concept in Sql Server. Does anyone know if there's any extender property I can use to flow through my authenticated user name? ps: I don't mind the impact on connection pooling (if any). Thanks. P

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• Get address using Geocoder in android

  - by user264953

  Hi, I tried to get the address of a particular location by giving static geocordinates. I was not able to fetch the address. Can someone please help. I just need to check whether this function works for me. Here is my snippet. Geocoder geocoder = new Geocoder(AddressSimulator.this, Locale.getDefault()); List<Address> addresses = geocoder.getFromLocation(1.352566007, 103.78921587, 1); System.out.println("Addresses size"+addresses.size()); Address size is obtained as zero. I tried with few other geocordinates also, but address size is always returned as 0. Experts, kindly help me resolve this. Looking forward for your valuable help/suggestions, Best Regards, Rony

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• how to validate all but not single pair of input box in jQuery

  - by I Like PHP

  i have a form which have 45 input boxes, i applied jquery validation for all input boxes , but there is two pair of input boxes which have either oneof them should be filled up, not both. so how do i change jquery so that if anyone fill up first pair then jquery does not check second pair of input box and if any one is fill up second pair then not check for fisrt one's and also i have used radio box for showing one pair at a time i show code below: jQuery Code <script type="text/javascript"> $j=jQuery.noConflict(); $j(document).ready(function() { function validate() { return $j("input:text,textarea,select,radio").removeClass('rdb').filter(function() { return !/\S+/.test($j(this).val()); }).addClass('rdb').size() == 0; } $j('#myForm').submit(validate); $j(":input:text,textarea,select").blur(function() { if(this.value.length > 0) { $j(this).removeClass('rdb'); } }); $j("input:radio").click(function(){ if($j(this).val()=='o'){ $j("#rcpt").css("display","none"); $j("#notRcpt").css("display","inline"); } if($j(this).val()=='r'){ $j("#notRcpt").css("display","none"); $j("#rcpt").css("display","inline"); } }); }); </script> PHP Code <form name="myForm" action="somepage.php" method="post" id="myForm"> <table width="100%" border="0" cellspacing="4" cellpadding="0"> <tr> <td class="boxtitle">Delivery Pick up Station/Place</td> <tr> <td style="font:bold 11px verdana;"> <input type="radio" name="receipt" value="r" >Receipt <input type="radio" name="receipt" value="o" >Other </td> </tr> <tr> <td> <table width="100%" border="0" cellspacing="3" cellpadding="0"> <tr id="rcpt" style="display:none"> <td width="12%" align="left">Receipt:</td> <td width="30%" align="left"<input type="text" name="deliveryNo" id="deliveryNo" /></td> <td width="25%" align="right">Pick up Date:</td> <td width="35%" align="left"><input name="deliveryDate" type="text" id="deliveryDate" /></td> </tr> <tr id="notRcpt" style="display:none"> <td>Other:</td> <td><input name="deliveryNo" type="text" id="deliveryNo" /></td> <td align="right">Pick up Date:</td> <td><input name="otherDeliveryDate" type="text" id="otherDeliveryDate" /></td> </tr> </table> </td> </tr> </table> </form>

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• How do I indicate that a class doesn't support certain operators?

  - by romeovs

  I'm writing a class that represents an ordinal scale, but has no logical zero-point (eg time). This scale should permit addition and substraction (operator+, operator+=, ...) but not multiplication. Yet, I always felt it to be a good practice that when one overloads one operator of a certain group (in this case the math operators), one should also overload all the others that belong to that group. In this case that would mean I should need to overload the multiplication and division operators also, because if a user can use A+B he would probable expect to be able the other operators. Is there a method that I can use to throw an error for this at compiler time? The easiest method would be just no to overload the operators operator*, ... yet it would seem appropriate to add a bit more explaination than operator* is not know for class "time". Or is this something that I really should not care about (RTFM user)?

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• Setting pointers to structs

  - by Bobby

  I have the following struct: struct Datastore_T { Partition_Datastores_T cmtDatastores; // bytes 0 to 499 Partition_Datastores_T cdhDatastores; // bytes 500 to 999 Partition_Datastores_T gncDatastores; // bytes 1000 to 1499 Partition_Datastores_T inpDatastores; // bytes 1500 1999 Partition_Datastores_T outDatastores; // bytes 2000 to 2499 Partition_Datastores_T tmlDatastores; // bytes 2500 to 2999 Partition_Datastores_T sm_Datastores; // bytes 3000 to 3499 }; I want to set a char* to struct of this type like so: struct Datastore_T datastores; // Elided: datastores is initialized with data here char* DatastoreStartAddr = (char*)&datastores; memset(DatastoreStartAddr, 0, 3500); The problem I have is that DatastoreStartAddr always has a value of zero when it should point to the struct that has been initialized with data. What am I doing wrong?

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• Get tableView:heightForRowAtIndexPath: to happen after tableView:cellForRowAtIndexPath:?

  - by Triz

  I've got some UITableViewCells that need to change their height depending on the length of the strings inside. I'm calculating the necessary height inside tableView:cellForRowAtIndexPath:, and then storing it in a variable (self.specialRowHeight). Then I've got: - (CGFloat)tableView:(UITableView *)tableView heightForRowAtIndexPath:(NSIndexPath *)indexPath { if (indexPath.section == SPECIAL_SECTION) { return self.specialRowHeight; } else { return 44; } } Except that seems to be getting called before the tableView:cellForRowAtIndexPath: bit, so it's always zero. Is there a way around this, or perhaps a different way to do it? Thanks!

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• What are the semantics of [myThing.myProperty release]?

  - by dugla

  I clearly have not fully grocked properties. I have an instance of a class, myThing. myThing has a property that has be synthesized: // .h @property(nonatomic,retain)MyCoolType *coolType; // .m @synthesize coolType; In my program I call: // The retain count on MyCoolType is 1. [myThing.coolType release]; The reference count on MyCoolType is now zero and dealloc should fire. So, shouldn't myThing.coolType now be nil? In my code that is not the case. How do a correctly release and force the property to return nil? Thanks, Doug

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• Virtual Screen Splitter

  - by dabest1

  I am looking for a utility that will allow my screen to be split into two sections. I would like to do this so that programs can easily fill or get sized properly to one part of the screen. This way I can pretend that I have a separate monitor for working on my stuff, while my kids can watch something on the other side. In addition, this should help prevent any popups covering up their side of the screen. Although Windows 7 comes with ability to drag a program window to a side and it becomes sized to half of the screen automatically, this is insufficient for me. I would like to make sure that any programs I launch or any pop-ups that open up, do not block the other side of the screen, even for a short time. Also, I am not looking for a virtual OS solution, as in VirtualBox.

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