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  • Write raw struct contents (bytes) to a file in C. Confused about actual size written

    - by d11wtq
    Basic question, but I expected this struct to occupy 13 bytes of space (1 for the char, 12 for the 3 unsigned ints). Instead, sizeof(ESPR_REL_HEADER) gives me 16 bytes. typedef struct { unsigned char version; unsigned int root_node_num; unsigned int node_size; unsigned int node_count; } ESPR_REL_HEADER; What I'm trying to do is initialize this struct with some values and write the data it contains (the raw bytes) to the start of a file, so that when I open this file I later I can reconstruct this struct and gain some meta data about what the rest of the file contains. I'm initializing the struct and writing it to the file like this: int esprime_write_btree_header(FILE * fp, unsigned int node_size) { ESPR_REL_HEADER header = { .version = 1, .root_node_num = 0, .node_size = node_size, .node_count = 1 }; return fwrite(&header, sizeof(ESPR_REL_HEADER), 1, fp); } Where node_size is currently 4 while I experiment. The file contains the following data after I write the struct to it: -bash$ hexdump test.dat 0000000 01 bf f9 8b 00 00 00 00 04 00 00 00 01 00 00 00 0000010 I expect it to actually contain: -bash$ hexdump test.dat 0000000 01 00 00 00 00 04 00 00 00 01 00 00 00 0000010 Excuse the newbiness. I am trying to learn :) How do I efficiently write just the data components of my struct to a file?

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  • Emulator TCP Packet Size

    - by jpspringall
    Has anyone tried to do a tcp client server app using the emulator using the pc as a server and the phone as the client? I've got a bit of an issue where its only sending one packet, ie 1491 bytes of data regardless of how much there actually is to send, from the client(Phone) to the server(PC) Thanks James

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  • UISegmentedControl not expanding size for navigation bar/very squished

    - by davetron5000
    Running through an iPhone SDK book and one of the examples has me creating a table and then later adding a UISegmentedControl to the table for sorting. I dutifully did this in IB, and it looks great: When I run it in the simulator or my phone, it's totally squished: The buttons work perfectly, it's just they are not sizing according to their content. Any ideas what's going wrong? Here's the attributes I have set:

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  • ImageAdapter and ListView (java.lang.OutOfMemoryError: bitmap size exceeds VM budget)

    - by theDude
    Hi, I'm using ListView to display images which I provide through an ImageAdapter class. it works great on my device (and on many other devices which I tested it on), but somehow when I'm using the emulator and I'm long-pressing the up/down button - I'm getting an outOfMemory error after 10-15 seconds. I tried clearing cache, canceling cache, etc. - nothing helped. I know this crash is pretty rare (i couldn't reproduced it on any "real" device), but I can see on DDMS that "GC freed" are getting bigger during that long press and I can't find a way to clear them. Any help will be appreciated, Tnx.

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  • How to initialize F# list when size is unknown, using while..do loop

    - by James Black
    I have a function that will parse the results of a DataReader, and I don't know how many items are returned, so I want to use a while..do loop to iterate over the reader, and the outcome should be a list of a certain type. (fun(reader) -> [ while reader.Read() do new CityType(Id=(reader.GetInt32 0), Name=(reader.GetString 1), StateName=(reader.GetString 2)) ]) This is what I tried, but the warning I get is: This expression should have type 'unit', but has type 'CityType'. Use 'ignore' to discard the result of the expression, or 'let' to bind the result to a name. So what is the best way to iterate over a DataReader and create a list?

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  • CSS: Size of buttons in Chrome is different than Firefox

    - by Hank
    I have the following HTML code: <style type="text/css"> .submitbutton{margin-left:-2px} </style> ... <form> ... <input class=submitbutton type=submit value="Create Listings" /> </form> In Firefox, the input button has more padding than in Chrome. Any ideas why? UPDATE: If you're wondering why I have the negative margin - it's because between the input field and the input button - there is too much space.

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  • Eclipse RCP Preferences Dialog Tree Size

    - by nerduban
    In my RCP application, I'm trying to use the Eclipse preferences dialog. I'm adding extensions to the "org.eclipse.ui.preferencePages" and preparing related IWorkbenchPreferencePage implementations. My preference page names are a bit long, so that they are not totally visible on the left side tree of the preferences dialog. Dragging the sash bar to the right increases the width of this tree, but it is resetted after the program is closed and reopened. Is it possible to increase the default width of this tree?

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  • PHPMailer attachment type and size limit

    - by SomeoneS
    i have one form and i am using PHPMailer to send data from that form to my email. Users can send attachments as well, but i have one rpoblem: how to make PHPMailer to deny attachments larger than 2Mb and to allow only iamge attachments (no other types of documents)? This is code i using for multiply email attachments with PHPMailer: foreach(array_keys($_FILES['fileAttach']['name']) as $key) { $source = $_FILES['fileAttach']['tmp_name'][$key]; $filename = $_FILES['fileAttach']['name'][$key]; $mail->AddAttachment($source, $filename); }

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  • Does the size of monitor Matters ?

    - by Arsheep
    I have a old computer , i want to buy a big LCD now the best i can found is Viewsonic's 24" lcd TFT monitor . So will it run without any problems or i need to upgrade the video cards or something too ? The computer is not that much old it has P4 bord and celeron processor with 128 graphics memory . And in properties it shows i can maximum use 1280 x 1024 resolution. I am noob hardware wise So need help on this stuff. Thanks

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  • Discovering maximum packet size

    - by ereOn
    I'm working on a network-related project and I am using DTLS (TLS/UDP) to secure communications. Reading the specifications for DTLS, I've noted that DTLS requires the DF flag (Don't Fragment) to be set. On my local network if I try to send a message bigger than 1500 bytes, nothing is sent. That makes perfect sense. On Windows the sendto() reports a success but nothing is sent. I obviously cannot unset the DF flag manually since it is mandatory for DTLS and i'm not sure whether the 1500 bytes limit (MTU ?) could change in some situations. I guess it can. So, my question is : "Is there a way to discover this limit ?" If not, what would be the lowest possible value ? My software runs under UNIX (Linux/MAC OSX) and Windows OSes so different solutions for each OS are welcome ;) Many thanks.

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  • Is there a buffer size attached to stdout?

    - by jameswelle
    I am trying to find some information on data limits related to stdout on Windows. I can't seem to find the information on MSDN. Is there a limit to how much data can be written to stdout? If so, what happens if the limit is reached? Is the data lost? If stdout is redirected (for example, by launching the process from .Net and using the ProcessStartInfo.RedirectStandardOutput property), does that have any effect on how much data can be written? As I read from the stdout stream in the calling process, does that affect the limitations? Are these limits related in any way to named pipes?

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  • Java heap size - will this work?

    - by UnCon
    Hi, I try this with NetBeans desktop application template - increasing heapsize (to 512 MiB) of executed .jar file. (I believe that NetBeans uses Singleton app by default - SingleFrameView) Will it work? public static void main(String[] args) { if (args == null) { args = new String[1]; args[0] = "Xmx512m"; } else { String[] tempArgs = new String[args.length+1]; for (int i=0; i<args.length; i++) { tempArgs[i] = args[i]; } tempArgs[tempArgs.length-1] = "Xmx512m"; args = tempArgs; } launch(MyApp.class, args); } }

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  • How to determine the width of content or size a container to content

    - by ISVK
    My goal is to display the entire contents of a FlowDocument (that is, without paginating) in a column layout. It would have a fixed height, but the width would depend on the contents of the FlowDocument. My problem is: FlowDocumentReader does not automatically resize to the contents of the FlowDocument. As you see in my XAML below, FlowDocumentReader.Width is 5000 units (just a large number that can accommodate most documents) -- when I make it Auto, it just clips to the width of the ScrollViewer and paginates my stuff! Is there a proper way of solving this problem? I also made a screenshot of what this looks like now, but the ScrollViewer scrolls past the end of the document in most cases: http://i.imgur.com/3FSRl.png <ScrollViewer x:Name="scrollViewer" HorizontalScrollBarVisibility="Visible" VerticalScrollBarVisibility="Disabled" > <FlowDocumentReader x:Name="flowDocReader" ClipToBounds="False" Width="5000" > <FlowDocument x:Name="flowDoc" Foreground="#FF404040" ColumnRuleWidth="2" ColumnGap="40" ColumnRuleBrush="#FF404040" IsHyphenationEnabled="True" IsOptimalParagraphEnabled="True" ColumnWidth="150"> <Paragraph> Lorem ipsum dolor sit amet, ...etc... </Paragraph> <Paragraph> Lorem ipsum dolor sit amet, ...etc... </Paragraph> <Paragraph> Lorem ipsum dolor sit amet, ...etc... </Paragraph> </FlowDocument> </FlowDocumentReader> </ScrollViewer>

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  • Core Text CTFrameSetter error with size suggestion

    - by JK
    I am trying to use the CTFramesetterSuggestFrameSizeWithConstraints method of CTFrameSetter to calculate the rect for a given attributed string. However, both the width and height are slightly less than needed. I would appreciate any suggestions on what may be causing this or how to correct it please.

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  • Max size of localStorage values?

    - by user269386
    Hi, since the localStorage (currently) only supports strings as values and in order to that the objects have to be stringified (stored as JSON-string), before they can be stored, i wondered if there is a defined limitation regarding the length of the values. Does anyone know if there is a definition which applies to all browsers, respectively does anyone know the limitations for Chrome5? Thanks, in advance, for your help

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  • K-means algorithm variation with minimum measure of size

    - by user1464628
    I'm looking for some algorithm such as k-means for grouping points on a map into a fixed number of groups, by distance. The number of groups has already been decided, but the trick part (at least for me) is to meet the criteria that the sum of MOS of each group should in the certain range, say bigger than 1. Is there any way to make that happen? ID MOS X Y 1 0.47 39.27846 -76.77101 2 0.43 39.22704 -76.70272 3 1.48 39.24719 -76.68485 4 0.15 39.25172 -76.69729 5 0.09 39.24341 -76.69884

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  • Size SKU in Magento

    - by latvian
    Hi, How can I allow SKU be longer than 34 characters (for simple products) for all products? When i add new product(simple) and enter more than 34 characters, Magento cuts it to 34 after saving. In the database the 'sku' attributes ( for quete item,order item,invoice item, shipment item) from eav_attribute table hold varchar(255). For Catalog_Product_Entity the attributed is VarChar(64). In either case, it is more than 34characters. Thus, I could change SKU to 64 characters without making any change in database, correct? How do i do that? I have good understanding of the user side magento code, but not Admin side. Can you suggest me good tutorial on making changes in Admin side that could help me figure this question myself. Thank you, Margots

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  • Android: Is decreasing size of .png files have some effect to resulted Bitmap in memory

    - by nahab
    I'm writing game with a large amount of .png pictures. All worked fine. Than I added new activity with WebView and got memory shortage. After that I made some experiment - replace game .png images with ones that just fully filled with some color. As result memory shortage had gone. But I suppose that Bitmap internally hold each pixel separately so such changes should have no effect. Maybe this because of initial images have alpha channel and my test images have not it? But actually question is: Will decreasing .png images files sizes make some effect on decreasing usage of VM application heap or not?

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  • number of elements in a static array of a predefined size

    - by cppb
    I have an array like this: int a[100]; I am filling only the first 4 elements in this array: a[0] = 1; a[1] = 2; a[2] = 3; a[3] = 4; When I do sizeof(a)/sizeof(a[0]) it returns 100. Is there a way I can get number of elements to which I have assinged a value and thus filtering out the remaining 96 unassigned elements? thanks

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