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  • Problem getting correct parameters for C# P/Invoke call to C++ dll

    - by Jim Jones
    Trying to Interop a functionality from the Outside In API from Oracle. Have the following function: SCCERR EXOpenExport {VTHDOC hDoc, VTDWORD dwOutputId, VTDWORD dwSpecType, VTLPVOID pSpec, VTDWORD dwFlags, VTSYSPARAM dwReserved, VTLPVOID pCallbackFunc, VTSYSPARAM dwCallbackData, VTLPHEXPORT phExport); From the header files I reduced the parameters to: typedef VTSYSPARAM VTHDOC, VTLPHDOC * typedef DWORD_PTR VTSYSPARAM typedef unsigned long DWORD_PTR typedef unsigned long VTDWORD typedef VTVOID* VTLPVOID #define VTVOID void typedef VTHDOC VTHEXPORT, *VTLPEXPORT These are for 32 bit windows Going through the header files, the example programs, and the documentation I found: 1. That pSpec could be a pointer to a buffer or NULL, so I set it to a IntPtr.Zero (documentation). 2. That dwFlags and dwReserved according to the documentation "Must be set by the developer to 0". 3. That pCallbackFunc can be set to NULL if I don't want to handle callbacks. 4. That the last two are based on structs that I wrote C# wrappers for using the [StructLayout(LayoutKind.Sequential)]. Then instatiated an instance and generated the parameters by first creating a IntPtr with Marshal.AllocHGlobal(Marshal.SizeOf(instance)), then getting the address value which is passed as a uint for dwCallbackData and a IntPtr for phExport. The final parameter list is as follows: 1. phDoc as a IntPtr which was loaded with an address by the DAOpenDocument function called before. 2. dwOutputId as uint set to 1535 which represents FI_JPEGFIF 3. dwSpecType as int set to 2 which represents IOTYPE_ANSIPATH 4. pSpec as an IntPtr.Zero where the output will be written 5. dwFlags as uint set to 0 as directed 6. dwReserved as uint set to 0 as directed 7. pCallbackFunc as IntPtr set to NULL as I will handle results 8. dwCallBackDate as uint the address of a buffer for a struct 9. phExport as IntPtr to another struct buffer still get an undefined error from the API. Meaning that the call returns a 961 which is not defined in any of the header files. In the past I have gotten this when my choice of parameter types are incorrect. I started out using Interop Assistant which was helpful in learning how many of the parameter types get translated. It is however limited by how well I am able to glean the correct native type from the header files. For example the hDoc parameter used in the preceding function was defined as a non-filesytem handle, so attempted to use Marshal to create a handle, then used an IntPtr, and finally it turned out to be an int (actually it was &phDoc used here). So is there a more scientific way of doing this, other than trial and error? Jim

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  • Is there a solution that lets Node.js act as an HTTP reverse proxy?

    - by Igor Zinov'yev
    Our company has a project that right now uses nginx as a reverse proxy for serving static content and supporting comet connections. We use long polling connections to get rid of constant refresh requests and let users get updates immediately. Now, I know there is a lot of code already written for Node.js, but is there a solution that lets Node.js act as a reverse proxy for serving static content as nginx does? Or maybe there is a framework that allows to quickly develop such a layer using Node.js?

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  • Further explanation of IntentService

    - by rayman
    Hi all, I was trying to get the purpose of the IntentService, and when should I use it? I tried to understand from the API, but not enough details on that one. Is there any analogy between this and running long-task on a working thread? Any further explanation and samples on why I would use IntentService would be very welcome. Thanks, ray.

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  • Possiblity of loading/executing ELF files on OSX

    - by Daniel Brotherston
    I'm just curious as to the possibility of loading and executing elf files on OSX. I know the standard executable format is MACHO, but NASM is unable to generate debug information for MACHO objects (and I am required to use NASM). I imagine its a long shot, but I don't suppose I can use ELF files. I can build them with NASM, but I can't seem to even link them with LD.

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  • WPF: Disable ListBox, but enable scrolling

    - by Matt Briggs
    Been banging my head against this all morning. Basically, I have a listbox, and I want to keep people from changing the selection during a long running process, but allow them to still scroll. Solution: All the answers were good, I went with swallowing mouse events since that was the most straight forward. I wired PreviewMouseDown and PreviewMouseUp to a single event, which checked my backgroundWorker.IsBusy, and if it was set the IsHandled property on the event args to true.

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  • grep + add time out after some time if not find the relevant match

    - by yael
    Dear friends I use the following command syntax to search params in my script grep -qsRw -m1 "any_param" /dir/..../ Some times the search take avery long time The question is how to add time out to grep command For example after 20 seconds grep will break out If it not illegal to add time out to grep , how it will possible on other way? THX Yael

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  • Fast or asynchronous AS3 JPEG encoding

    - by Bart van Heukelom
    I'm currently using the JPGEncoder from the AS3 core lib to encode a bitmap to JPEG var enc:JPGEncoder = new JPGEncoder(90); var jpg:ByteArray = enc.encode(bitmap); Because the bitmap is rather large (3000 x 2000) the encoding takes a long while (about 20 seconds), causing the application to seemingly freeze while encoding. To solve this, I need either: An asynchronous encoder so I can keep updating the screen (with a progress bar or something) while encoding An alternative encoder which is simply faster Is either possible?

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  • Should I include user_id in multiple tables?

    - by Drarok
    I'm at the planning stages of a multi-user application where each user will only have access their own data. There'll be a few tables that relate to each other, so I could use JOINs to ensure they're accessing only their data, but should I include user_id in each table? Would this be faster? It would certainly make some of the queries easier in the long run. Thanks!

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  • pretty print makefiles

    - by wickedchicken
    The linux kernel (and various other projects including git) have very nice makefiles that hide the giant cc calls into nice little acronyms. For example: gcc -O2 -o cool.o cool.c -llib gcc -O2 -o neat.o neat.c -llib would become: CC cool.c CC neat.c Which is really nice if you have a project with a large number of files and long compiler flags. I recall that this had to do with suppressing the default output and making a custom one. How do you do it?

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  • java double[][] - display as image

    - by joe_shmoe
    Hi all, just wondering if there is a simple way in java to display the contents of say 16x16 array of doubles [0..1] as a greyscale image (ala matlab)? using an unfamiliar matrix library, so I'd like to check that I'm on the right track. don't really care if it is slow or ugly, or if it requires external library - it's just there for a quick look, so as long as it works, I'm fine.

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  • informix odbc connection slow to open in asp.net

    - by zombiegx
    I have an application that takes a long time to open odbc connections (like 20 sec) also takes forever using arcmap and arcsde but when I try the connection on the odbc data source administrator, it tests it really fast Does anyone have any idea of what my be causing this? btw the application works fine in another computer with another database thanks.

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  • When should I use Dependency Injection and when utility methods?

    - by Roman
    I have a Java EE project with Spring IoC container. I've just found in Utils class static method sendMail(long list of params). I don't know why but I feel that it would look better if we had separate class (Spring bean with singleton scope) which will be responsible for sending email. But I can't find any arguments which can prove my position. So, are there any pros (or cons) in using DI in this (rather general) situation?

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  • [PHP-GD] How to use imagefill() from file?

    - by KPL
    Hello people, Thanks for looking at this question. I wanted to know how can I use the GD function imagefill() to patch an image with another image. imagefill() currently accepts resource of a color. I can do that. But wanted to know how this can be done with a file. I noticed a user note - But that didn't worked and took a long time for completion :-( http://www.php.net/manual/en/function.imagefill.php#84288

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  • Is there an easy way to compare if 2 XDocuments are equal ignoring element/attribute order?

    - by Davy8
    Unit testing my serialization code I found one failed because I had attributes listed in a different order (I'm just comparing the XDocument.ToString() values) and while I could fix that, it really doesn't matter to me in what order the elements or attributes appear as long as they're all there with the right name at the right level of hierarchy. I could probably write a method do this, but I'm wondering if there's an easy built in way I'm not aware of.

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  • Ruby on Rails wildcard routing such as /foo.htm /foo.php /foo.something

    - by fregas
    I'm trying to create a routing situation where by default, any URL's such as this: /foo /something /foo.php /somethingelse.xml /something.something.else etc. will all route to one controller, assuming they don't route anywhere else. i can get this to work with the following code in my routes: map.myroute '/:file_or_folder', :controller = 'mycontroller' this works fine as long as there are no dots in the URL: /something but this wont work: /something.foo any ideas?

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  • Why aren't static const floats allowed?

    - by Jon Cage
    I have a class which is essentially just holds a bunch of constant definitions used through my application. For some reason though, longs compile but floats do not: class MY_CONSTS { public : static const long LONG_CONST = 1; // Compiles static const float FLOAT_CONST = 0.001f; // C2864 }; Gives the following error: 1>c:\projects\myproject\Constant_definitions.h(71) : error C2864: 'MY_CONSTS::FLOAT_CONST' : only static const integral data members can be initialized within a class Am I missing something?

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  • Should I use PHP or PHP + J2EE?

    - by Sean Xiong
    I'm going to start a new project with instant message support. I find that there is no good long polling solution in PHP, but there is some good ones in J2EE. I'm wondering if I can integrate PHP and J2EE to get the function? Or should I just use J2EE instead of PHP? Thanks.

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