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  • DirectShow Filter I wrote dies after 10-24 seconds in Skype video call

    - by Robert Oschler
    I've written a DirectShow push filter for use with Skype using Delphi Pro 6 and the DSPACK DirectShow library. In preview mode, when you test a video input device in the Skype client Video Settings window, my filter works flawlessly. I can leave it up and running for many minutes without an error. However when I start a video call after 10 to 24 seconds, never longer, the video feed freezes. The call continues fine with the call duration counter clicking away the seconds, but the video feed is dead, stuck on whatever frame the freeze happened (although after a long while it turns black which I believe means Skype has given up on the filter). I tried attaching to the process from my debugger with a breakpoint literally set on every method call and none of them are hit once the freeze takes place. It's as if the thread that makes the DirectShow FillBuffer() call to my filter on behalf of Skype is dead or has been shutdown. I can't trace my filter in the debugger because during a Skype call I get weird int 1 and int 3 debugger hard interrupt calls when a Skype video call is in progress. This behavior happens even with my standard web cam input device selected and my DirectShow filter completely unregistered as a ActiveX server. I suspect it might be some "anti-debugging" code since it doesn't happen in video input preview mode. Either way, that is why I had to attach to the process after the fact to see if my FillBuffer() called was still being called and instead discovered that appears to be dead. Note, my plain vanilla USB web cam's DirectShow filter does not exhibit the freezing behavior and works fine for many minutes. There's something about my filter that Skype doesn't like. I've tried Sleep() statements of varying intervals, no Sleep statements, doing virtually nothing in the FillBuffer() call. Nothing helps. If anyone has any ideas on what might be the culprit here, I'd like to know. Thanks, Robert

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  • What is the relationship between Turing Machine & Modern Computer ?

    - by smwikipedia
    I heard a lot that modern computers are based on Turing machine. I just cannot build a bridge from a conceptual Turing Machine to a real modern computer. Could someone help me build this bridge? Below is my current understanding. I think the computer is a big general-purpose Turing machine. Each program we write is a small specific-purpose Turing machine. The classical Turing machine do its job based on the input and its current state inside and so do our programs. Let's take a running program (a process) as an example. We know that in the process's address space, there's areas for stack, heap, and code. A classical Turing machine doesn't have the ability to remember many things, so we borrow the concept of stack from the push-down automaton. The heap and stack areas contains the state of our specific-purpose Turing machine (our program). The code area represents the logic of this small Turing machine. And various I/O devices supply input to this Turing machine.

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  • Am I using EJBs properly?

    - by kgrad
    I am using a JEE6 stack including JPA 2.0, JSF 2.0, EJB 3.1 etc. The way my architecture is setup is the following: I have JPA annotated DAOs using hibernate as my JPA provider. I have JSF Managed beans which correspond to my facelet/xhtml pages. I have EJBs that handle all of my database requests. My XHTML pages have JSF EL which make calls to my Managed beans. My managed beans contain references to my DAO entities which are managed by EJBs. For example, I have a user entity which is mapped to a db table. I have a user EJB which handles all CRUD operations that return Users. I have a page that edits a user. The highlevel workflow would be: navigate to user edit page - EL calls a method located in the managed bean that loads a user. The method calls userEJB.loadUser(user) from the EJB to get the user from the database. The user is edited and submit - a function is called in the managed bean which calls a function in the EJB to save the user. etc. I am running into issues accessing my data within my JSF pages using EJBs. I am having a lot of problems with lazy initialization errors, which I believe is due to how I have set things up. For example, I have a Client entity that has a List of users which are lazily loaded. In order to get a client I call a method in my EJB which goes to the database, finds a client and returns it. Later on i wish to access this clients list of users, in order to do so i have to go back to the EJB by calling some sort of method in order to load those users (since they are lazily loaded). This means that I have to create a method such as public List<User> getUserListByClient(Client c) { c = em.merge(c); return c.getUserList(); } The only purpose of this method is to load the users (and I'm not even positive this approach is good or works). If i was doing session management myself, I would like just leave the session open for the entire request and access the property directly, this would be fine as the session would be open anyway, there seems to be this one extra layer of indirection in EJBs which is making things difficult for me. I do like EJBs as I like the fact that they are controlled by the container, pooled, offer transaction management for free etc. However, I get the feeling that I am using them incorrectly, or I have set up my JSF app incorrectly. Any feedback would be greatly appreciated. thanks,

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  • Decoding tcp packets using python

    - by mikip
    Hello I am trying to decode data received over a tcp connection. The packets are small, no more than 100 bytes. However when there is a lot of them I receive some of the the packets joined together. Is there a way to prevent this. I am using python I have tried to separate the packets, my source is below. The packets start with STX byte and end with ETX bytes, the byte following the STX is the packet length, (packet lengths less than 5 are invalid) the checksum is the last bytes before the ETX def decode(data): while True: start = data.find(STX) if start == -1: #no stx in message pkt = '' data = '' break #stx found , next byte is the length pktlen = ord(data[1]) #check message ends in ETX (pktken -1) or checksum invalid if pktlen < 5 or data[pktlen-1] != ETX or checksum_valid(data[start:pktlen]) == False: print "Invalid Pkt" data = data[start+1:] continue else: pkt = data[start:pktlen] data = data[pktlen:] break return data , pkt I use it like this #process reports try: data = sock.recv(256) except: continue else: while data: data, pkt = decode(data) if pkt: process(pkt) Also if there are multiple packets in the data stream, is it best to return the packets as a collection of lists or just return the first packet I am not that familiar with python, only C, is this method OK. Any advice would be most appreciated. Thanks in advance Thanks

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  • How can I execute pl/pgsql code without creating a function?

    - by Jeremiah Peschka
    With SQL Server, I can execute code ad hoc T-SQL code with full procedural logic through SQL Server Management Studio, or any other client. I've begun working with PostgreSQL and have run into a bit of a difference in that PGSQL requires any logic to be embedded in a function. Is there a way to execute PL/PGSQL code without creating an executing a function?

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  • php email marketing open source

    - by Bharanikumar
    Hi, Anyone knows about some free open source php library or framework to implement following service independently. Email Marketing , Which include following service in that , send email , choose email template , Choose email template from local drive , text template , Account management like History email list , and more , Payment Integration , Thanks bharanikumar

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  • Do servlet containers prevent web applications from causing each other interference and how do they do it?

    - by chrisbunney
    I know that a servlet container, such as Apache Tomcat, runs in a single instance of the JVM, which means all of its servlets will run in the same process. I also know that the architecture of the servlet container means each web application exists in its own context, which suggests it is isolated from other web applications. As depicted here: Accepting that each web application is isolated, I would expect that you could create 2 copies of an identical web application, change the names and context paths of each (as well as any other relevant configuration), and run them in parallel without one affecting the other. The answers to this question appear to support this view. However, a colleague disagrees based on their experience of attempting just that. They took a web application and tried to run 2 separate instances (with different names etc) in the same servlet container and experienced issues with the 2 instances conflicting (I'm unable to elaborate more as I wasn't involved in that work). Based on this, they argue that since the web applications run in the same process space, they can't be isolated and things such as class attributes would end up being inadvertently shared. This answer appears to suggest the same thing The two views don't seem to be compatible, so I ask you: Do servlet containers prevent web applications deployed to the same container from conflicting with each other? If yes, How do they do this? If no, Why does interference occur? and finally, Under what circumstances could separate web applications conflict and cause each other interference?, perhaps scenarios involving resources on the file system, native code, or database connections?

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  • Doing large updates against indexed view

    - by user217136
    We have an indexed view that runs across three large tables. Two of these tables (A & B) are constantly getting updated with user transactions and the other table (C) contains data product info that is needs to be updated once a week. This product table contains over 6 million records. We need this view across these three tables for our core business process and unfortunately we cannot change this aspect. We even had a sql server MVP come in to help test under load to make sure we have the most efficient configuration. There is one column in the product table that gets utilized in the view and has to be updated each week. The problem we are now encountering is that as volume is increasing on our transactions against tables A & B, the update to Table C is causing deadlocks. I have tried several different methods to no avail: 1) I was hoping that we could change the view so that table C could be a dirty read "WITH (NOLOCK)" but apparently that functionality is not available with indexes views. 2) I thought about updating a new column in Table C and then just renaming it when the process is done but you cannot do that due to the dependency in the view. 3) I also entertained the idea of writing this value to a temporary product table, and then running an ALTER statement against the view to have it point to my new table. however when i did that the indexes on my view were dropped and it took quite a bit of time to recreate them. 4) we tried to do the weekly update in small chunks (as small as 100 records at a time) but we still run into dead locks. questions: a) we are using sql server 2005. Does sql server 2008 have a new functionality with their indexed views that would help us? Is there now a way to do dirty reads w/ an indexed view? b) a better approach to altering an existing view to point to a new table? thanks!

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  • What is the exact difference between MEM_RESERVE and MEM_COMMIT states?

    - by pj4533
    As I understand it MEM_RESERVE is actually 'free' memory, ie available to be used by my process, but just hasn't been allocated yet? Or it was previously allocated, but had since been freed? Specifically, see in my !address output below how I am nearly out of virtual address space (99900 KB free, 2307872 as MEM_PRIVATE. But the states shows that 44.75% of that is actually MEM_RESERVE. Does that mean it is actually free, in my process...but maybe fragmented? 0:000> !address -summary --------- PEB a8bd8000 not found ---- -------------------- Usage SUMMARY -------------------------- TotSize ( KB) Pct(Tots) Pct(Busy) Usage 259af000 ( 616124) : 22.29% 23.12% : RegionUsageIsVAD 618f000 ( 99900) : 03.61% 00.00% : RegionUsageFree 13e22000 ( 325768) : 11.78% 12.22% : RegionUsageImage 42c04000 ( 1093648) : 39.56% 41.04% : RegionUsageStack 42d000 ( 4276) : 00.15% 00.16% : RegionUsageTeb 2625d000 ( 625012) : 22.61% 23.45% : RegionUsageHeap 0 ( 0) : 00.00% 00.00% : RegionUsagePageHeap 0 ( 0) : 00.00% 00.00% : RegionUsagePeb 1000 ( 4) : 00.00% 00.00% : RegionUsageProcessParametrs 1000 ( 4) : 00.00% 00.00% : RegionUsageEnvironmentBlock Tot: a8bf0000 (2764736 KB) Busy: a2a61000 (2664836 KB) -------------------- Type SUMMARY -------------------------- TotSize ( KB) Pct(Tots) Usage 618f000 ( 99900) : 03.61% : <free> 13e22000 ( 325768) : 11.78% : MEM_IMAGE 1e77000 ( 31196) : 01.13% : MEM_MAPPED 8cdc8000 ( 2307872) : 83.48% : MEM_PRIVATE -------------------- State SUMMARY -------------------------- TotSize ( KB) Pct(Tots) Usage 57235000 ( 1427668) : 51.64% : MEM_COMMIT 618f000 ( 99900) : 03.61% : MEM_FREE 4b82c000 ( 1237168) : 44.75% : MEM_RESERVE Largest free region: Base 7e4a1000 - Size 000ff000 (1020 KB)

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  • Migration of .NET COM object to 64 bit.

    - by Victor Ronin
    Hi, We have C++ application which uses several COM object. COM object are .NET based (using COM Interop). I need to migrate application to 64 bit. I specifically need C++ application to be 64 bit. I don't want to recompile all of .NET com object to 64 bit and deliver two sets of DLL's (32 bit and 64 bit). I was investigating and found that I can load 32 bit COM Dll's in 32 bit surrogate process using (DllSurrogate in registry). I know how to do that, but it means that all COM objects will become out of process. In the C++ I had the code: CoCreateInstance(CLSID_SomeClass, NULL, CLSCTX_INPROC_SERVER, IID_SomeInterface, (void**)&pobj); It worked fine, but as soon as I switch to CLSCTX_LOCAL_SERVER (and add registry keys for DllSurrogate), it can't find interfaces (error 0x80004002). I checked registry and found out that when .NET COM DLL is registered, it adds ClsID registry keys, but doesn't add Interface and TypeLib registry key. The question is, how to create these registry keys for .NET COM? Regards, Victor

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  • Which persistent & lightweight queue messaging for cross domain (> 2) data exchange with rails integ

    - by Erwan
    Hi all, I'm looking for the right messaging system for my needs. Can you help me ? For now, there won't be a huge amount of data to process, but I don't want to be limited later ... The machines are not just web servers, so the messaging tool should be lightweight, even if processing is not very speed. When some data change on a server, all servers should have the information and process it locally. (should I create one channel per server on each of them ?) The frontend is written on Rails, so it is important, in order to simplify the development, that there is a gem / plugin to manage communications and data sent. At this time : RabbitMQ + workling seems to fit my needs. Could this be a right choice ? ActiveMQ make me afraid, because of Java (I really don't know very well Java, but it seems to me to be big CPU consumer) Others don't seem to be as mature as them. There might be lot of development using this kind of technology, so I can't go to the wrong way ! Thank you for help.

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  • Beginning with SQL

    - by Natasha
    Hey ALL; I am enthusiastic to enter the world of Databases through SQL , but i don't know if there's pre-requisits of any significance , i only know c# and java . Besides what tools do i need? i have visual studio 2008 and sql server management studio what else do i need? is it necessary to download a server OS? Bare with me i'm just a beginner lol Thanks all Natasha

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  • Why would some $_POST variables go missing for a form with PHP?

    - by Chad Johnson
    Sometimes, multiple times a day in fact, users of my web application are submitting a certain form which has about a dozen form fields, half of which are hidden fields, and half of the $_POST data is simply not present in the processing script. Note that the fields that are not present are at the very bottom of the form. I know this because this raises a fatal error, and an email is dispatched to me which includes the post data. And of course, neither I nor any of the developers on my team can reproduce the problem. Flash is involved in the process, as I'm using a library called Uploadify to display a progress meter. Here is the flow...does anyone have ANY ideas at all why some of the post data would be getting wiped out? User visits edit screen for a page in the CMS I am using. Record id for the page is put into a form as a hidden value. User clicks the Uploadify browse button and selects a file (only single file selection is allowed). User clicks Submit button for my form. jQuery intercepts the form submit action, triggers Uploadify to start uploading, and returns false for the submit action (manually cancelling the form submit event so that Uploadify can take over). Uploadify uploads to a custom process script. Uploadify finishes uploading and triggers the Javascript completion callback. The Javascript callback calls $('#myForm').submit() to submit the form. This happens on multiple browsers (Firefox 3.5, 3.6, Safari, Internet Explorer 7, 8) and multiple platforms (Mac OS 10.5, 10.6 and Windows XP, 7).

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  • How to create a console application that does not terminate?

    - by John
    Hello, In C++,a console application can have a message handler in its Winmain procedure.Like this: int WINAPI WinMain(HINSTANCE hInstance, HINSTANCE hPrevInstance, LPSTR lpCmdLine, int nCmdShow) { HWND hwnd; MSG msg; #ifdef _DEBUG CreateConsole("Title"); #endif hwnd = CreateDialog(hInstance, MAKEINTRESOURCE(IDD_DIALOG1), NULL, DlgProc); PeekMessage(&msg, NULL, 0, 0, PM_NOREMOVE); while(msg.message != WM_QUIT) { if(PeekMessage(&msg, NULL, 0, 0, PM_REMOVE)) { if(IsDialogMessage(hwnd, &msg)) continue; TranslateMessage(&msg); DispatchMessage(&msg); } } return 0; } This makes the process not close until the console window has received WM_QUIT message. I don't know how to do something similar in delphi. My need is not for exactly a message handler, but a lightweight "trick" to make the console application work like a GUI application using threads. So that, for example, two Indy TCP servers could be handled without the console application terminating the process. My question: How could this be accomplished?

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  • Signals and Variables in VHDL - Problem

    - by Morano88
    I have a signal and this signal is a bitvector. The length of the bitvector depends on an input n, it is not fixed. In order to find the length, I have to do some computations. Can I define a signal after defining the variables ? It is ggiving me errors when I do that. It is working fine If I keep the signal before the variables .. but I don't want that .. the length of Z depends on the computations of the variables. What is the solution ? library IEEE; use IEEE.STD_LOGIC_1164.ALL; use IEEE.STD_LOGIC_ARITH.ALL; use IEEE.STD_LOGIC_UNSIGNED.ALL; entity BSD_Full_Comp is Generic (n:integer:=8); Port(X, Y : inout std_logic_vector(n-1 downto 0); FZ : out std_logic_vector(1 downto 0)); end BSD_Full_Comp; architecture struct of BSD_Full_Comp is Component BSD_BitComparator Port ( Ai_1 : inout STD_LOGIC; Ai_0 : inout STD_LOGIC; Bi_1 : inout STD_LOGIC; Bi_0 : inout STD_LOGIC; S1 : out STD_LOGIC; S0 : out STD_LOGIC ); END Component; Signal Z : std_logic_vector(2*n-3 downto 0); begin ass : process Variable length : integer := n; Variable pow : integer :=0 ; Variable ZS : integer :=0; begin while length /= 0 loop length := length/2; pow := pow+1; end loop; length := 2 ** pow; ZS := length - n; wait; end process; end struct;

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  • Configure database mail settings

    - by Paresh
    How can I configure database mail settings and send the mail from the database in Sharepoint created default database instance as i can not find where to configure the database mail settings from the management after login sa user.

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  • Database schema for multiple category/product relationship

    - by sree01
    I want to design a database for an e-commerce application with category/subcategory management. Please suggest a database schema where we can create categories and subcategories and add products to those categories. Each product can have multiple categories and we can select products belong to multiple categories using a boolean database query Thanks

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  • How can I substitute the nth occurrence of a match in a Perl regex?

    - by Zaid
    Following up from an earlier question on extracting the n'th regex match, I now need to substitute the match, if found. I thought that I could define the extraction subroutine and call it in the substitution with the /e modifier. I was obviously wrong (admittedly, I had an XY problem). use strict; use warnings; sub extract_quoted { # à la codaddict my ($string, $index) = @_; while($string =~ /'(.*?)'/g) { $index--; return $1 if(! $index); } return; } my $string = "'How can I','use' 'PERL','to process this' 'line'"; extract_quoted ( $string, 3 ); $string =~ s/&extract_quoted($string,2)/'Perl'/e; print $string; # Prints 'How can I','use' 'PERL','to process this' 'line' There are, of course, many other issues with this technique: What if there are identical matches at different positions? What if the match isn't found? In light of this situation, I'm wondering in what ways this could be implemented.

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  • Abort SAX parsing mid-document?

    - by CSharperWithJava
    I'm parsing a very simple XML schema with a SAX parser in Android. An example file would be <Lists> <List name="foo"> <Note title="note 1" .../> <Note title="note 2" .../> </List> <List name="bar"> <Note title="note 3" .../> </List> </Lists> The ... represents more note data as attributes that aren't important to question. I use a SAX parser to parse the document and only implement the startElement and 'endElement' methods of the HandlerBase to handle Note and List nodes. However, In some cases the files can be very large and take some time to process. I'd like to be able to abort the parsing process at any time (i.e. user presses cancel button). The best way I've come up with is to throw an exception from my startElement method when certain conditions are met (i.e. boolean stopParsing is true). Is there a better way to do this? I've always used DOM style parsers, so I don't fully understand the SAX parser. One final note, I'm running this on Android, so I will have the Parser running on a worker thread to keep the UI responsive. If you know how I can kill the thread safely while the parser is running that would answer my question as well.

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  • Is there a way to use sharepoint as the back-end versioning and storage for my custom document manag

    - by Aaron Palmer
    I want to build a custom document management web application that ties in with sharepoint for the actual document versioning and storage. I'm hoping for something like a sharepoint widget that I can plug into my web application that would allow me to tie in with sharepoint and download documents, make edits to them, and upload them back to sharepoint, with sharepoint handling all of the versioning and storage. If WSS is the answer to this, are there licensing issues that I need to consider? Thanks.

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  • SSAS Cube reprocessing fails - then succeeds if I try again

    - by EdgarVerona
    So I'm basically brand new to the concept of BI, and I've inherited an existing ETL process that is a two step process: 1) Loads the data into a database that is only used by the cube processing 2) Starts off the SSAS cube processing against said database It seems pretty well isolated, but occasionally (once a week, sometimes twice) it will fail with the following exception: "Errors in the OLAP storage engine: The attribute key cannot be found" Now the interesting thing is that: 1) The dimension having the issue is not usually the same one (i.e. there's no single dimension that consistently has this failure) 2) The source table, when I inspect it, does actually contain the attribute key that it says could not be found And, most interestingly... 3) If I then immediately reprocess the dimensions and cubes manually through SSMS, they reprocess successfully and without incident. In both the aforementioned job and when I reprocess them through SSMS, I am using "ProcessFull", so it should be reprocessing them completely. Has anyone run into such an issue? I'm scratching my head about it... because if it was a genuine data integrity issue, reprocessing the cube again wouldn't fix it. What on earth could be happening? I've been tasked with finding out why this happens, but I can neither reproduce it consistently nor can I point to a data integrity problem as the root cause. Thanks for any input you can provide!

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  • Get script of SQL Server data

    - by Jared
    I'm looking for a way to do something analogous to the MySql dump from SQL Server. I need to be able to pick the tables and export the schema and the data (or I can export the schema via SQL Server Management Studio and export the data separately somehow). I need this data to be able to turn around and go back into SQL Server so it needs to maintain GUIDs/uniqueidentifiers and other column types. Does anyone know of a good tool for this?

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  • tsql replace value on select

    - by Zelter Ady
    I have a column (SERVICE_ID) in my table where I can have only 3 values: 0, 1 and 2. I'd like on select, on displayed result table, to change those value with some english words. select client, SERVICE_ID from customers displays now: -------------------------- | John | 1 | Mike | 0 | Jordan | 1 | Oren | 2 -------------------------- I'd like to change the query to get: -------------------------- | John | QA | Mike | development | Jordan | QA | Oren | management -------------------------- There is any way to do this using only the select?

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  • GetEffectiveRightsFromAcl throws invalid acl error

    - by apoorv020
    I am trying to get the effective rights a user has on a file using interop in C#. Following is the code I am using : public static FileSystemRights GetFileEffectiveRights(string FileName, string UserName) { IntPtr pDacl, pZero = IntPtr.Zero; int Mask = 0; uint errorReturn = GetNamedSecurityInfo(FileName, SE_OBJECT_TYPE.SE_FILE_OBJECT, SECURITY_INFORMATION.Dacl , out pZero, out pZero, out pDacl, out pZero, out pZero); if (errorReturn != 0) { throw new Exception("Win error : " + errorReturn); } Program.TRUSTEE pTrustee = new TRUSTEE(); pTrustee.pMultipleTrustee = IntPtr.Zero; pTrustee.MultipleTrusteeOperation = (int)Program.MULTIPLE_TRUSTEE_OPERATION.NO_MULTIPLE_TRUSTEE; pTrustee.ptstrName = UserName; pTrustee.TrusteeForm = (int)Program.TRUSTEE_FORM.TRUSTEE_IS_NAME; pTrustee.TrusteeType = (int)Program.TRUSTEE_TYPE.TRUSTEE_IS_USER; errorReturn = GetEffectiveRightsFromAcl(pDacl, ref pTrustee, ref Mask); if (errorReturn != 0) { throw new Exception("Win error : " + errorReturn); } return (FileSystemRights)Mask; } This code works fine until I start modifying the ACL structure using the classes FileAccessRule and FileInfo, and then I start getting Windows Error 1336 : ERROR_INVALID_ACL. Same is the case if I debug the process call GetFileEffectiveRights once, pause the process,change the ACL through windows API, and resume and call GetFileEffectiveRights again(the 1st call succeeds but the second gives 1336.) What is going wrong?

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