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  • Dereferencing within a buffer

    - by kaykun
    Let's say I had a char pointer pointing to a buffer that contained these values (in hex): 12 34 56 78 00 00 80 00 I want to modify the last two bytes to a short value of 42. So I would think I would have to do something like this: (short)*(pointer+6)=42; The compiler doesn't complain but it does not do what I'm expecting it to do. Can someone tell me the correct way to assign the value?

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  • OpenGL Motion blur with the accumulation buffer

    - by Klaus
    Hello, I'm trying to achieve a motion blur effect in my OpenGL application. I read somewhere this solution, using the accumulation buffer: glAccum(GL_MULT, 0.90); glAccum(GL_ACCUM, 0.10); glAccum(GL_RETURN, 1.0); glFlush(); at the end of the render loop. But nothing happens... What I am missing ?

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  • Removing a line from the buffer in a vim script

    - by ahe
    According to http://vimdoc.sourceforge.net/htmldoc/usr_41.html#function-list vim script has functions setline() and append() to modify the current buffer but how do i delete a line from within a script? With setline(1, "") the line is only emptied but I want to get rid of it.

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  • Yank file name / path of current buffer in Vim

    - by Dave Tapley
    Assuming the current buffer is a file open for edit, so :e does not display E32: No file name. I would like to yank one or all of: The file name exactly as show on the status line, e.g. ~\myfile.txt A full path to the file, e.g. c:\foo\bar\myfile.txt Just the file name, e.g. myfile.txt

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  • buffer size for socket connection in c++

    - by wyatt
    I'm trying to build a basic POP3 mail client in C/++, but I've run into a bit of an issue. Since you have to define the buffer size when building the program, but a message can be arbitrarily large, how do you, say, get the mail server to send it to you in parts? And if this isn't the correct means of solving the problem, what is? And while I'm here, can anyone confirm for me that RFC 2822 is still the current document defining email layout? Thanks

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  • Google Protocol Buffers - Fixed size buffer?

    - by Roey
    Hi All. Using Google Protocol Buffers, can I set a maximum size for all messages I encode? if I know that what I encode is never larger than X bytes, then Google Protobuffs would always produce a buffer of size Y, and if I give it a smaller amount of data, pad it to size Y?

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  • Convert image buffer to pdf with ImageMagick in C++

    - by Chris
    Hi, I've downloaded the dll's for ImageMagick and am wondering if anybody knows of some example code to accomplish a simple task: I have generated an image in C++ and have the buffer in RGB format. I need to convert it to PDF format (without writing to a file) before sending it over a TCP socket. Is this doable with ImageMagick (or any other library)?

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  • Do we set the bar too high by requiring that code tests not suffer from buffer overflow?

    - by brice
    We are currently recruiting for a Junior Developer position working mainly in C on Linux. As part of the process, we require candidates to complete a code test at their leisure in C. So far we have rejected two candidates on the basis that their code, although readable and in one case rather idiomatic, suffered from buffer overflow errors due to unbounded buffer writes. Are buffer overflows acceptable from a graduate developer? Are we setting the bar too high? What is the expected capability of graduate/Junior engineers? [Edit]: We explicitly ask for error-checked, production quality code. We provide a test & build framework for the candidates

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  • Java OpenGL color material darkens when depth test is disabled

    - by Jeff Storey
    I've been working with the depth buffer in OpenGL (JOGL) to ensure certain items are rendered in front of others by disabling the depth buffer (detailed in my previous question http://stackoverflow.com/questions/2516086/java-opengl-saving-depth-buffer). This works, except when I set the color of an item that is being drawn when the depth test is disabled, none of the material shininess shows up. The item is rendered as a darker version of the original color (it seems like there is no lighting effect really applied to it). Is there a reason why this would be happening? and how might I prevent this? thanks, Jeff

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  • Python MQTT: TypeError: coercing to Unicode: need string or buffer, bool found

    - by user2923860
    When my python code tries to connect to the MQTT broker it gives me this Type Error: Update- I added the Complete Error Traceback (most recent call last): File "test.py", line 20, in <module> mqttc.connect(broker, 1883, 60, True) File "/usr/local/lib/python2.7/dist-packages/mosquitto.py", line 563, in connect return self.reconnect() File "/usr/local/lib/python2.7/dist-packages/mosquitto.py", line 632, in reconnect self._sock = socket.create_connection((self._host, self._port), source_address=(self._bind_address, 0)) File "/usr/lib/python2.7/socket.py", line 561, in create_connection sock.bind(source_address) File "/usr/lib/python2.7/socket.py", line 224, in meth return getattr(self._sock,name)(*args) TypeError: coercing to Unicode: need string or buffer, bool found The code of the python file is: #! /usr/bin/python import mosquitto broker = "localhost" #define what happens after connection def on_connect(rc): print "Connected" #On recipt of a message do action def on_message(msg): n = msg.payload t = msg.topic if t == "/test/topic": if n == "test": print "test message received" # create broker mqttc = mosquitto.Mosquitto("python_sub") #define callbacks mqttc.on_message = on_message mqttc.on_connect = on_connect #connect mqttc.connect(broker, 1883, 60, True) #Subscribe to topic mqttc.subscribe("/test/topic", 2) #keep connected while mqttc.loop() == 0: pass I have no idea why its giving me this it work 2 days ago.

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  • How do I run gtk demos?

    - by Runner
    They are located under: share\gtk-2.0\demo But none of them contains a main function, how can I make the following textscroll.c actually work: /* Text Widget/Automatic scrolling * * This example demonstrates how to use the gravity of * GtkTextMarks to keep a text view scrolled to the bottom * while appending text. */ #include <gtk/gtk.h> #include "demo-common.h" /* Scroll to the end of the buffer. */ static gboolean scroll_to_end (GtkTextView *textview) { GtkTextBuffer *buffer; GtkTextIter iter; GtkTextMark *mark; char *spaces; static int count; buffer = gtk_text_view_get_buffer (textview); /* Get "end" mark. It's located at the end of buffer because * of right gravity */ mark = gtk_text_buffer_get_mark (buffer, "end"); gtk_text_buffer_get_iter_at_mark (buffer, &iter, mark); /* and insert some text at its position, the iter will be * revalidated after insertion to point to the end of inserted text */ spaces = g_strnfill (count++, ' '); gtk_text_buffer_insert (buffer, &iter, "\n", -1); gtk_text_buffer_insert (buffer, &iter, spaces, -1); gtk_text_buffer_insert (buffer, &iter, "Scroll to end scroll to end scroll " "to end scroll to end ", -1); g_free (spaces); /* Now scroll the end mark onscreen. */ gtk_text_view_scroll_mark_onscreen (textview, mark); /* Emulate typewriter behavior, shift to the left if we * are far enough to the right. */ if (count > 150) count = 0; return TRUE; } /* Scroll to the bottom of the buffer. */ static gboolean scroll_to_bottom (GtkTextView *textview) { GtkTextBuffer *buffer; GtkTextIter iter; GtkTextMark *mark; char *spaces; static int count; buffer = gtk_text_view_get_buffer (textview); /* Get end iterator */ gtk_text_buffer_get_end_iter (buffer, &iter); /* and insert some text at it, the iter will be revalidated * after insertion to point to the end of inserted text */ spaces = g_strnfill (count++, ' '); gtk_text_buffer_insert (buffer, &iter, "\n", -1); gtk_text_buffer_insert (buffer, &iter, spaces, -1); gtk_text_buffer_insert (buffer, &iter, "Scroll to bottom scroll to bottom scroll " "to bottom scroll to bottom", -1); g_free (spaces); /* Move the iterator to the beginning of line, so we don't scroll * in horizontal direction */ gtk_text_iter_set_line_offset (&iter, 0); /* and place the mark at iter. the mark will stay there after we * insert some text at the end because it has right gravity. */ mark = gtk_text_buffer_get_mark (buffer, "scroll"); gtk_text_buffer_move_mark (buffer, mark, &iter); /* Scroll the mark onscreen. */ gtk_text_view_scroll_mark_onscreen (textview, mark); /* Shift text back if we got enough to the right. */ if (count > 40) count = 0; return TRUE; } static guint setup_scroll (GtkTextView *textview, gboolean to_end) { GtkTextBuffer *buffer; GtkTextIter iter; buffer = gtk_text_view_get_buffer (textview); gtk_text_buffer_get_end_iter (buffer, &iter); if (to_end) { /* If we want to scroll to the end, including horizontal scrolling, * then we just create a mark with right gravity at the end of the * buffer. It will stay at the end unless explicitely moved with * gtk_text_buffer_move_mark. */ gtk_text_buffer_create_mark (buffer, "end", &iter, FALSE); /* Add scrolling timeout. */ return g_timeout_add (50, (GSourceFunc) scroll_to_end, textview); } else { /* If we want to scroll to the bottom, but not scroll horizontally, * then an end mark won't do the job. Just create a mark so we can * use it with gtk_text_view_scroll_mark_onscreen, we'll position it * explicitely when needed. Use left gravity so the mark stays where * we put it after inserting new text. */ gtk_text_buffer_create_mark (buffer, "scroll", &iter, TRUE); /* Add scrolling timeout. */ return g_timeout_add (100, (GSourceFunc) scroll_to_bottom, textview); } } static void remove_timeout (GtkWidget *window, gpointer timeout) { g_source_remove (GPOINTER_TO_UINT (timeout)); } static void create_text_view (GtkWidget *hbox, gboolean to_end) { GtkWidget *swindow; GtkWidget *textview; guint timeout; swindow = gtk_scrolled_window_new (NULL, NULL); gtk_box_pack_start (GTK_BOX (hbox), swindow, TRUE, TRUE, 0); textview = gtk_text_view_new (); gtk_container_add (GTK_CONTAINER (swindow), textview); timeout = setup_scroll (GTK_TEXT_VIEW (textview), to_end); /* Remove the timeout in destroy handler, so we don't try to * scroll destroyed widget. */ g_signal_connect (textview, "destroy", G_CALLBACK (remove_timeout), GUINT_TO_POINTER (timeout)); } GtkWidget * do_textscroll (GtkWidget *do_widget) { static GtkWidget *window = NULL; if (!window) { GtkWidget *hbox; window = gtk_window_new (GTK_WINDOW_TOPLEVEL); g_signal_connect (window, "destroy", G_CALLBACK (gtk_widget_destroyed), &window); gtk_window_set_default_size (GTK_WINDOW (window), 600, 400); hbox = gtk_hbox_new (TRUE, 6); gtk_container_add (GTK_CONTAINER (window), hbox); create_text_view (hbox, TRUE); create_text_view (hbox, FALSE); } if (!gtk_widget_get_visible (window)) gtk_widget_show_all (window); else gtk_widget_destroy (window); return window; }

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  • Android source code not working, reading frame buffer through glReadPixels

    - by Muhammad Ali Rajput
    Hi, I am new to Android development and have an assignment to read frame buffer data after a specified interval of time. I have come up with the following code: public class mainActivity extends Activity { Bitmap mSavedBM; private EGL10 egl; private EGLDisplay display; private EGLConfig config; private EGLSurface surface; private EGLContext eglContext; private GL11 gl; protected int width, height; //Called when the activity is first created. @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); // get the screen width and height DisplayMetrics dm = new DisplayMetrics(); getWindowManager().getDefaultDisplay().getMetrics(dm); int screenWidth = dm.widthPixels; int screenHeight = dm.heightPixels; String SCREENSHOT_DIR = "/screenshots"; initGLFr(); //GlView initialized. savePixels( 0, 10, screenWidth, screenHeight, gl); //this gets the screen to the mSavedBM. saveBitmap(mSavedBM, SCREENSHOT_DIR, "capturedImage"); //Now we need to save the bitmap (the screen capture) to some location. setContentView(R.layout.main); //This displays the content on the screen } private void initGLFr() { egl = (EGL10) EGLContext.getEGL(); display = egl.eglGetDisplay(EGL10.EGL_DEFAULT_DISPLAY); int[] ver = new int[2]; egl.eglInitialize(display, ver); int[] configSpec = {EGL10.EGL_NONE}; EGLConfig[] configOut = new EGLConfig[1]; int[] nConfig = new int[1]; egl.eglChooseConfig(display, configSpec, configOut, 1, nConfig); config = configOut[0]; eglContext = egl.eglCreateContext(display, config, EGL10.EGL_NO_CONTEXT, null); surface = egl.eglCreateWindowSurface(display, config, SurfaceHolder.SURFACE_TYPE_GPU, null); egl.eglMakeCurrent(display, surface, surface, eglContext); gl = (GL11) eglContext.getGL(); } public void savePixels(int x, int y, int w, int h, GL10 gl) { if (gl == null) return; synchronized (this) { if (mSavedBM != null) { mSavedBM.recycle(); mSavedBM = null; } } int b[] = new int[w * (y + h)]; int bt[] = new int[w * h]; IntBuffer ib = IntBuffer.wrap(b); ib.position(0); gl.glReadPixels(x, 0, w, y + h, GL10.GL_RGBA,GL10.GL_UNSIGNED_BYTE,ib); for (int i = 0, k = 0; i < h; i++, k++) { //OpenGLbitmap is incompatible with Android bitmap //and so, some corrections need to be done. for (int j = 0; j < w; j++) { int pix = b[i * w + j]; int pb = (pix >> 16) & 0xff; int pr = (pix << 16) & 0x00ff0000; int pix1 = (pix & 0xff00ff00) | pr | pb; bt[(h - k - 1) * w + j] = pix1; } } Bitmap sb = Bitmap.createBitmap(bt, w, h, Bitmap.Config.ARGB_8888); synchronized (this) { mSavedBM = sb; } } static String saveBitmap(Bitmap bitmap, String dir, String baseName) { try { File sdcard = Environment.getExternalStorageDirectory(); File pictureDir = new File(sdcard, dir); pictureDir.mkdirs(); File f = null; for (int i = 1; i < 200; ++i) { String name = baseName + i + ".png"; f = new File(pictureDir, name); if (!f.exists()) { break; } } if (!f.exists()) { String name = f.getAbsolutePath(); FileOutputStream fos = new FileOutputStream(name); bitmap.compress(Bitmap.CompressFormat.PNG, 100, fos); fos.flush(); fos.close(); return name; } } catch (Exception e) { } finally { //if (fos != null) { // fos.close(); // } } return null; } } Also, if some one can direct me to better way to read the framebuffer it would be great. I am using Android 2.2 and virtual device of API level 8. I have gone through many previous discussions and have found that we can not know read frame buffer directly throuh the "/dev/graphics/fb0". Thanks, Muhammad Ali

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  • How to merge two FBOs?

    - by DevDevDev
    OK so I have 4 buffers, 3 FBOs and a render buffer. Let me explain. I have a view FBO, which will store the scene before I render it to the render buffer. I have a background buffer, which contains the background of the scene. I have a user buffer, which the user manipulates. When the user makes some action I draw to the user buffer, using some blending. Then to redraw the whole scene what I want to do is clear the view buffer, draw the background buffer to the view buffer, change the blending, then draw the user buffer to the view buffer. Finally render the view buffer to the render buffer. However I can't figure out how to draw a FBO to another FBO. What I want to do is essentially merge and blend two FBOs, but I can't figure out how! I'm very new to OpenGL ES, so thanks for all the help.

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  • Table alias has an effect with execution time?

    - by RedFux227
    So I have this query : SELECT A.e_cd "INFLATE" , A.ccgpt "1" , ( SELECT J.comp FROM JBB J WHERE J.e_cd=A.e_cd AND emplo_RCD=:1 AND J.Dte = ( SELECT MAX(J1.Dte) FROM JBB J1 WHERE J.e_cd=J1.e_cd AND TO_CHAR(J1.Dte,'MM') <=A.mth_to AND TO_CHAR(J1.Dte,'YYYY') <=A.year ) AND J.seq = ( SELECT MAX(J2.seq) FROM PS_JOB J2 WHERE J2.e_cd=J.e_cd AND J2.Dte=J.Dte)) "Company" FROM PPS A WHERE orcd=:2 AND rcd=:3 AND tx_cd=:4 AND year=:5 With this one : SELECT A.e_cd "INFLATE" , A.ccgpt "1" , ( SELECT J.comp FROM JBB J WHERE J.e_cd=A.e_cd AND emplo_RCD=:1 AND J.Dte = ( SELECT MAX(J1.Dte) FROM JBB J1 WHERE J.e_cd=J1.e_cd AND TO_CHAR(J1.Dte,'MM') <=A.mth_to AND TO_CHAR(J1.Dte,'YYYY') <=A.year ) AND J.seq = ( SELECT MAX(J1.seq) **FROM PS_JOB J1 WHERE J1.e_cd=J.e_cd AND J1.Dte=J.Dte**)) "Company" FROM PPS A WHERE orcd=:2 AND rcd=:3 AND tx_cd=:4 AND year=:5 The 1st query run for about 3.20 sec with buffer gets 8,134 and for the 2nd query it run for about 1.73 sec with buffer gets 7,006. So, is the table alias somehow has an impact on the execution time / buffer gets? Thanks in advance!

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