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• Rendering Swing Components to an Offscreen buffer

  - by Nick C

  I have a Java (Swing) application, running on a 32-bit Windows 2008 Server, which needs to render it's output to an off-screen image (which is then picked up by another C++ application for rendering elsewhere). Most of the components render correctly, except in the odd case where a component which has just lost focus is occluded by another component, for example where there are two JComboBoxes close to each other, if the user interacts with the lower one, then clicks on the upper one so it's pull-down overlaps the other box. In this situation, the component which has lost focus is rendered after the one occluding it, and so appears on top in the output. It renders correctly in the normal Java display (running full-screen on the primary display), and attempting to change the layers of the components in question does not help. I am using a custom RepaintManager to paint the components to the offscreen image, and I assume the problem lies with the order in which addDirtyRegion() is called for each of the components in question, but I can't think of a good way of identifying when this particular state occurs in order to prevent it. Hacking it so that the object which has just lost focus is not repainted stops the problem, but obviously causes the bigger problem that it is not repainted in all other, normal, circumstances. Is there any way of programmatically identifying this state, or of reordering things so that it does not occur? Many thanks, Nick

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• transition of x-axis results in overflow

  - by peter

  First of all, no: this question is not about the (yet) ugly transition of the lines (I might open another one for that, though..). I'm displaying data in line charts and the user can select the time horizon. The x-axis then correspondingly transitions so as to fit to the changed time horizon. In attached image, e.g., the time horizon was 1 week and then I switched to 4 weeks. The number of ticks on the x-axis increases from 7 to 28, correspondingly. Question: How can I prevent the x-axis animation to display outside the svg container? As you can see, the additional dates fly in from the left and they are being animated far far outside the container. Any ideas? Right now, the transition works probably in the most simple way it could: // format for x-axis var xAxis = d3.svg.axis() .scale(x) .orient("bottom") .tickFormat(d3.time.format("%d.%m")) .ticks(d3.time.days, 1) .tickSubdivide(0); // Update x-axis svg.select(".x") .transition() .duration(500) .call(xAxis);

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• Multiple frame buffer in android

  - by user332158

  Hi All, I am working on creating multiple displays on a single screen, i.e., I want to run two different activities simultaneously. I came to know that, to achieve this requirement we need to change the surfaceflinger code and some hardware properties in the android source. Can anybody help me in finding the exact procedure in modifying the surfaceflinger and other parts of the android source in order to get two displays Thanks in advance.

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• Default input and output buffering for fopen'd files?

  - by Evan Teran

  So a FILE stream can have both input and output buffers. You can adjust the output stream using setvbuf (I am unaware of any method to play with the input buffer size and behavior). Also, by default the buffer is BUFSIZ (not sure if this is a POSIX or C thing). It is very clear what this means for stdin/stdout/stderr, but what are the defaults for newly opened files? Are they buffered for both input and output? Or perhaps just one? If it is buffered, does output default to block or line mode?

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• MySQL database Int overflow and can't login in.

  - by Ryan SMith

  I have a MySQL database on my server and I"m pretty sure it's an int over flow on one table with an auto_increment field that's crashing it. I can delete the table, it's not very important, but I can't get into the server. Is there anyway to delete that database from the file system or without logging into MySQL? HELP! THE WORLD IS ENDING!

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• How can I avoid the overflow when wheel scolling WPF DataGrid

  - by Jan Bannister

  When I use the mouse wheel to scroll the WPF Toolkit DataGrid on a Vista 64 Machine I get a cryptic low level error: at System.IntPtr.op_Explicit(IntPtr value) at System.Windows.Interop.HwndMouseInputProvider.FilterMessage(IntPtr hwnd, Int32 msg, IntPtr wParam, IntPtr lParam, Boolean& handled) at System.Windows.Interop.HwndSource.InputFilterMessage(IntPtr hwnd, Int32 msg, IntPtr wParam, IntPtr lParam, Boolean& handled) at MS.Win32.HwndWrapper.WndProc(IntPtr hwnd, Int32 msg, IntPtr wParam, IntPtr lParam, Boolean& handled) at MS.Win32.HwndSubclass.DispatcherCallbackOperation(Object o) at System.Windows.Threading.ExceptionWrapper.InternalRealCall(Delegate callback, Object args, Boolean isSingleParameter) at System.Windows.Threading.ExceptionWrapper.TryCatchWhen(Object source, Delegate callback, Object args, Boolean isSingleParameter, Delegate catchHandler) I logged an issue on CodePlex. But has anyone found a way to resolve this already?

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• how to post questions in stack overflow.com [closed]

  - by stackuser1

  what is this 2. how to do this? 3. why do we do this? 3. why do we do this? 3. why do we do this? 3. why do we do this? 3. why do we do this?

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• How large is a "buffer" in PostgreSQL

  - by Konrad Garus

  I am using pg_buffercache module for finding hogs eating up my RAM cache. For example when I run this query: SELECT c.relname, count(*) AS buffers FROM pg_buffercache b INNER JOIN pg_class c ON b.relfilenode = c.relfilenode AND b.reldatabase IN (0, (SELECT oid FROM pg_database WHERE datname = current_database())) GROUP BY c.relname ORDER BY 2 DESC LIMIT 10; I discover that sample_table is using 120 buffers. How much is 120 buffers in bytes?

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• displaying a saved buffer in OpenGL ES

  - by Adam

  Hi everyone, So basically I have a screenshot that I've saved that I want to later display on the screen. I've saved it with: glReadPixels(0, 0, self.bounds.size.width, self.bounds.size.height, GL_RGBA, GL_UNSIGNED_BYTE, savedBuffer); And later I'm trying to write it to the screen with: GLuint RenderedTex; glGenTextures(1, &RenderedTex); glEnable(GL_TEXTURE_2D); glBindTexture(GL_TEXTURE_2D, RenderedTex); glTexImage2D (GL_TEXTURE_2D, 0, GL_RGBA, self.bounds.size.width, self.bounds.size.height, 0, GL_RGBA, GL_UNSIGNED_BYTE, savedBuffer); glDisable(GL_TEXTURE_2D); I'm pretty new to OpenGL so I don't know if I'm doing things right... actually I know I'm not, because nothing shows up. Also not sure how to dispose of the texture when I'm done with it. Anyone know the correct way to do this? Edit: I think I might be having a problem loading the texture because it's not a power of 2, it's 320x480... also, I think this code is just loading the texture, but not drawing it, I'd need a call to glDrawArrays(GL_TRIANGLE_STRIP, 0, 4) in there somewhere...

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• Emacs: have save-buffer happen in background

  - by EoghanM

  Emacs seems to save synchronously, i.e. the interface locks up during a save. This is especially noticeable when using tramp. Is there any way to have the save happen in the background?

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• Stack Overflow like Watermarks in Forms

  - by Kaushik Gopal

  Hey people, I remember seeing a tutorial somewhere that talks of how to style your input forms in a more "usable" way. Essentially, you have a placeholder value and when you enter the input, it hides the hint so to speak. Now, just to be clear: I don't want the hint (placeholder value text) to disappear onFocus, but rather to go lighter when I first start typing something. Good e.gs: Check out the forms on Aardvark http://vark.com/. This is exactly how I wish to have my input forms. Our very own stackoverflow. When you try to ask a question, on clicking inside any input form, it doesn't hide the text right away. You see your cursor as well as the hint. but when you start to type, it hides the hint(I would prefer having it go to a much lighter shade rather than hiding all together, like above example). I remember very clearly reading a tutorial somewhere on the interwebz with this exact requirement, but darn forgot to bookmark it. Any suggestions/links?

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• C# Class Instantiation Overflow

  - by Goober

  Scenario I have a C# Win Forms App, where the Main Form contains a loop that creates 3000 Instances of another form (Form B). Inside Form B there are a large number of properties and fields and a bunch of methods that do a fair amount of processing. Question Will the creation of 3000 of these classes give me problems? I'm thinking along the lines of memory exceptions? I've had 1 or 2 already, and I've also had an exception that says something along the lines of "Something went bang and this is usually a sign of corrupt memory somewhere else". Setup I'm using a DevExpress Ribbon Form and I haven't implemented Dispose on anything....Do I need to? Help greatly appreciated.

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• Using read() directly into a C++ std:vector

  - by Joe

  I'm wrapping up user space linux socket functionality in some C++ for an embedded system (yes, this is probably reinventing the wheel again). I want to offer a read and write implementation using a vector. Doing the write is pretty easy, I can just pass &myvec[0] and avoid unnecessary copying. I'd like to do the same and read directly into a vector, rather than reading into a char buffer then copying all that into a newly created vector. Now, I know how much data I want to read, and I can allocate appropriately (vec.reserve). I can also read into &myvec[0], though this is probably a VERY BAD IDEA. Obviously doing this doesn't allow myvec.size to return anything sensible. Is there any way of doing this that 1) Doesn't completely feel yucky from a safety/C++ perspective and 2) Doesn't involve two copies of the data block - once from kernel to user space and once from a C char * style buffer into a C++ vector. Any thoughts collective?

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• vim plugin to show current Perl subroutine

  - by Andrew

  I'm trying to make a vim plugin that will split the window on load and simulate a info bar at the top of my terminal. I've got it sorta working but I think I've either reached limits of my knowledge of vim syntax or there's a logic problem in my code. The desired effect would be to do a reverse search for any declaration of a Perl subroutine form my current location in the active buffer and display the line in the top buffer. I'm also trying to make it skip that buffer when I switch buffers with <C-R>. My attempt at that so far can be seen in the mess of nested if statements. Anyway, here's the code. I would greatly appreciate feedback from anyone. (pastebin pastebin.com/8cuMPn1Q) let s:current_function_bufname = 'Current\ Function\/Subroutine' function! s:get_current_function_name(no_echo) let lnum = line(".") let col = col(".") if a:no_echo let s:current_function_name = getline(search("^[^s]sub .$", 'bW')) else echohl ModeMsg echo getline(search("^[^s]sub .$", 'bW')) "echo getline(search("^[^ \t#/]\{2}.[^:]\s$", 'bW')) echohl None endif endfunction let s:previous_winbufnr = 1 let s:current_function_name = '' let s:current_function_buffer_created = 0 let s:current_function_bufnr = 2 function! s:show_current_function() let total_buffers = winnr('$') let current_winbufnr = winnr() if s:previous_winbufnr != current_winbufnr if bufname(current_winbufnr) == s:current_function_bufname if s:previous_winbufnr < current_winbufnr let i = current_winbufnr + 1 if i total_buffers let i = 1 endif if i == s:current_function_bufnr let i = i + 1 endif if i total buffers let i = 1 endif exec i.'wincmd w' else let i = current_winbufnr - 1 if i < 1 let i = total_buffers endif if i == s:current_function_bufnr let i = i - 1 endif if i < 1 let i = total_buffers endif try exec i.'wincmd w' finally exec total_buffers.'wincmd w' endtry endif endif let s:previous_winbufnr = current_winbufnr return 1 endif if s:current_function_buffer_created == 0 exec 'top 1 split '.s:current_function_bufname call s:set_as_scratch_buffer() let s:current_function_buffer_created = 1 let s:current_function_bufnr = winnr() endif call s:activate_buffer_by_name(s:current_function_bufname) setlocal modifiable call s:get_current_function_name(1) call setline(1, s:current_function_name) setlocal nomodifiable call s:activate_buffer_by_name(bufname(current_winbufnr)) endfunction function! s:set_as_scratch_buffer() setlocal noswapfile setlocal nomodifiable setlocal bufhidden=delete setlocal buftype=nofile setlocal nobuflisted setlocal nonumber setlocal nowrap setlocal cursorline endfunction function! s:activate_buffer_by_name(name) for i in range(1, winnr('$')) let name = bufname(winbufnr(i)) let full_name = fnamemodify(bufname(winbufnr(i)), ':p') if name == a:name || full_name == a:name exec i.'wincmd w' return 1 endif endfor return 0 endfunction set laststatus=2 autocmd! CursorMoved,CursorMovedI,BufWinEnter * call s:show_current_function() (pastebin pastebin.com/8cuMPn1Q) similar to VIM: display custom reference bar on top of window and http://vim.wikia.com/wiki/Show_current_function_name_in_C_programs

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• TCP and UDP are using different OS Buffer?

  - by Jack

  HI all. Here is the scenario. I have port 8888 for my program to use. I build a TCP and a UDP listener on that port. (This can do, c# allows, because they are two different protocols) My question is If the network traffic is very busy, TCP sockets may refuse or signalling the other end to stop sending things, it is called congestion control, right? So if TCP is congestion controlling, other ends may not send more data, in this "TCP quiet period", UDP channel should have not that much of traffic, right? I want to figure out the TCP traffic will affect UDP traffic or not?

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• jquery simplemodal question (about window overflow)

  - by Matthew Steiner

  I noticed that if the height of the window is too small (meaning that the modal is taller than the window is), then even scrolling up or down won't reveal more of the modal, since it is constantly centering itself to the center of the window. Is there a good way of changing this? I have a tall modal that if someone's using a short monitor it may cause problems. Not to mention just general usability. I would guess that somewhere in the code you can test for if the window height is less than the modal to not worry about centering it vertically? Ideas?

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• [PHP] - Output buffer based progress bar

  - by KPL

  Hello people, I have been trying to get the following code working. It's a progress bar trick which uses ob_get_clean() function. Don't know why but this script just don't work! Only the initial percent - 1% comes up and nothing after that. <?php error_reporting(8191); function flush_buffers(){ @ob_end_flush(); @ob_flush(); @flush(); @ob_start(); } $ini = 2; echo '<script>document.getElementById(\'lpt\').style.width=\'1%\';</script><br>'; for($i=1;$i<=100;$i++) { $k=$ini-1; $str=str_replace("width=\'$k%\'","width=\'$i%\'",ob_get_clean()); $ini++; echo $str; flush_buffers(); } ?>

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• OpenAL device, buffer and context relationship

  - by Markus

  I'm trying to create an object oriented model to wrap OpenAL and have a little problem understanding the devices, buffers and contexts. From what I can see in the Programmer's Guide, there are multiple devices, each of which can have multiple contexts as well as multiple buffers. Each context has a listener, and the alListener*() functions all operate on the listener of the active context. (Meaning that I have to make another context active first if I wanted to change it's listener, if I got that right.) So far, so good. What irritates me though is that I need to pass a device to the alcCreateContext() function, but none to alGenBuffers(). How does this work then? When I open multiple devices, on which device are the buffers created? Are the buffers shared between all devices? What happens to the buffers if I close all open devices? (Or is there something I missed?)

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• Protocol buffer deserialization and a dynamically loaded DLL in Compact Framework

  - by cloudraven

  I saw a question related to this on the full framework here. Since it seems to have stayed unresolved for quite a while and this is for the compact framework, I though it would be better to create a new question for it. I want to deserialize types for which I am loading assemblies dynamically (with Assembly.LoadFrom) and I am getting a "Unable to identify known-type for ProtoIncludeAttribute" error. In the related question I mentioned, it was hinted that hooking AppDomain.AssemblyResolve event would help solving the problem. It makes sense for the full framework, but that event is not available in the CF. I wonder if there is a way to do this with CF. The structures I am using look a lot like this and all the classes required for deserialization are loaded from the same Assembly. If the assembly is referenced instead of dynamically loaded it works fine, but fails if done dynamically.

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• Copying a byte buffer with JNI

  - by Daniel

  I've found plenty of tutorials / questions on Stackoverflow that deal with copying char arrays from C/JNI side into something like a byte[] in Java, but not the other way around. I am using a native C library which expects a byte array. I simply want to get data from a byte[] in java, into preferably an unsigned char[] in C. Long story short: What is the best way of copying data from a jBytearray in JNI? Is there any way to detect it's size?

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• CSS Overflow issue in IE7

  - by BrynJ

  I'm working on a site for a client at the moment, and have it working correctly in all browsers except IE7 (IE6 and IE8 tested fine). It's a WordPress site and the theme is a child theme of the Thematic framework. This is an example of a page that is not displayed correctly in IE7: http://roynesbitt.credit-medics.co.uk/our-donors The main content is forcing vertical and horizontal scrollbars on the main wrapper and is also not pushing the footer down, so that is appearing midway through it. The irony is that this works correctly in IE6, it's just IE7 that is displaying this issue. Any suggestions on how to fix are gratefully received.

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• No-overflow cast on x64

  - by Cheeso

  I have an existing C codebase that works on x86. I'm now compiling it for x64. What I'd like to do is cast a size_t to a DWORD, and throw an exception if there's a loss of data. Q: Is there an idiom for this? Here's why I'm doing this: A bunch of Windows APIs accept DWORDs as arguments, and the code currently assumes sizeof(DWORD)==sizeof(size_t). That assumption holds for x86, but not for x64. So when compiling for x64, passing size_t in place of a DWORD argument, generates a compile-time warning. In virtually all of these cases the actual size is not going to exceed 2^32. But I want to code it defensively and explicitly. This is my first x64 project, so... be gentle.

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• IE jQuery ajax results in a stack overflow

  - by dave

  I have the following code that in IE gives me an error in jQuery for "open(G,M.url,M.async" $("#submitButton").click(function(){ $.ajax({ type: "POST", url: "http://url.com/postChat.php", data: "comment="+$("#userInput").val(), success: function(msg){ } }); }); Any ideas as to why this would happen in IE?

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• CSS horizontal scrolling overflow with jQuery slider

  - by Jeffrey

  I'm trying to setup a full screen jquery slider. I've broken the project into two steps 1) css and 2) js. 1) CSS, below is a picture of what I'm shooting for (no fixed height) and below that is the code I have so far that doesn't work. <html xmlns="http://www.w3.org/1999/xhtml" xml:lang="en" lang="en"> <head> <style type="text/css"> /* Positioning */ #container { width: 2500px; } .block { display: inline; } /* Styling */ .block img { padding: 5px; } </style> </head> <body> <div id="container"> <div class="block"><img src="http://i42.tinypic.com/1zp2poz.gif"></div> <div class="block"><img src="http://i42.tinypic.com/1zp2poz.gif"></div> <div class="block"><img src="http://i42.tinypic.com/1zp2poz.gif"></div> </div> </body> </html> 2) Javascript, using jquery I'd like the divs to slide left when clicked on them... like the jQuery Coda Slider if possible. Thanks, any help is appreciated.

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• Boost::asio bug in MSVC10 - Failing BOOST_WORKAROUND in ~buffer_debug_check() in buffer.hpp

  - by shaz

  A straight compilation of example http://www.boost.org/doc/libs/1_43_0/doc/html/boost_asio/tutorial/tutdaytime3/src.html results in a runtime null pointer exception. Stack trace points to the buffer_debug_check destructor which contains this comment: // MSVC's string iterator checking may crash in a std::string::iterator // object's destructor when the iterator points to an already-destroyed // std::string object, unless the iterator is cleared first. The test #if BOOST_WORKAROUND(BOOST_MSVC, = 1400) succeeds in MSVC10 and (but) results in a null pointer exception in c:\Program Files (x86)\Microsoft Visual Studio 10.0\VC\include\xutility line 123 _Iterator_base12& operator=(const _Iterator_base12& _Right) { // assign an iterator if (_Myproxy != _Right._Myproxy) _Adopt(_Right._Myproxy->_Mycont); return (*this); } _Right._Myproxy is NULL

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