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  • Why is System.arraycopy native in Java?

    - by James B
    I was surprised to see in the Java source that System.arraycopy is a native method. Of course the reason is because it's faster. But what native tricks is the code able to employ that make it faster? Why not just loop over the original array and copy each pointer to the new array - surely this isn't that slow and cumbersome? Thanks, -James

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  • Using memcpy to change a jnz to a jmp.

    - by Phil
    Not used memcpy much but here's my code that doesn't work. memcpy((PVOID)(enginebase+0x74C9D),(void *)0xEB,2); (enginebase+0x74C9D) is a pointer location to the address of the bytes that I want to patch. (void *)0xEB is the op code for the kind of jmp that I want. Only problem is that this crashes the instant that the line tries to run, I don't know what I'm doing wrong, any incite?

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  • NullPointerException when trying to add an object to a PriorityQueue

    - by meagan
    i keep getting a null pointer exception when trying to add an object to a priority queue i initialize the queue: private PriorityQueue<NodeObject> nodes; and here i try to add to it: NodeObject childNode = new NodeObject(child, 1); nodes.add(childNode); why doesn't this work? i know my NodeObject is not null because i create it right before i add it.

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  • How to download a folder of files from a web server using Delphi

    - by Brian Frost
    I've checked out the usefule link how to download a file from internet using Delphi and my question related but I would appreciate a pointer to get started. I need to be able to copy all files in a web server folder down to a local folder. I wont know how many files there are, or indeed whether there is an internet connection. Are there component(s) that would help me please? Or can I use Windows API? Thanks Brian

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  • char array to LPCTSTR

    - by Yan Cheng CHEOK
    May I know how I can perform the following conversion? // el.strCap is char[50] // InsertItem is expecting TCHAR pointer (LPCTSTR) // How I can perform conversion? // I do not have access in both "list" and "el" source code // Hence, there is no way for me to modify their signature. list.InsertItem(i, el.strCap); And No. I do not want to use WideCharToMultiByte They are too cumbersome to be used.

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  • Draggable Clones Jquery?

    - by jbatson
    Any ideas on how to make the clones draggable? $("#draggable").draggable({ helper: 'clone', cursor: 'pointer', }); $("#snaptarget").droppable({ drop: function(event, ui) { var randomnumber = Math.floor(Math.random()*1000000); var newId = '#draggable_'+randomnumber; $(ui.helper).clone(true).removeAttr('id').attr('id',newId).appendTo('#snaptarget'); $(newId).draggable(); } }); $(newId).draggable(); does not work.

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  • AVAudioPlayer error for Iphone Development

    - by KamalBhr
    Hello , I am developing an iphone application using "AVAudioPlayer" for playing a ".wav" file . For this i am adding header file "#import <AVFoundation/AVAudioPlayer.h>" . But while compiling i am getting error like : ".objc_class_name_AVAudioPlayer", referenced from: literal-pointer@__OBJC@__cls_refs@AVAudioPlayer in WebviewController.o ld: symbol(s) not found collect2: ld returned 1 exit status" . So can you please tell me the solution for this type of error.... Thanks & Regards, KamalBhr "

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  • header confusion. Compiler not recognizing datatypes

    - by numerical25
    I am getting confused on why the compiler is not recognizing my classes. So I am just going to show you my code and let you guys decide. My error is this error C2653: 'RenderEngine' : is not a class or namespace name and it's pointing to this line std::vector<RenderEngine::rDefaultVertex> m_verts; Here is the code for rModel, in its entirety. It contains the varible. the class that holds it is further down. #ifndef _MODEL_H #define _MODEL_H #include "stdafx.h" #include <vector> #include <string> //#include "RenderEngine.h" #include "rTri.h" class rModel { public: typedef tri<WORD> sTri; std::vector<sTri> m_tris; std::vector<RenderEngine::rDefaultVertex> m_verts; std::wstring m_name; ID3D10Buffer *m_pVertexBuffer; ID3D10Buffer *m_pIndexBuffer; rModel( const TCHAR *filename ); rModel( const TCHAR *name, int nVerts, int nTris ); ~rModel(); float GenRadius(); void Scale( float amt ); void Draw(); //------------------------------------ Access functions. int NumVerts(){ return m_verts.size(); } int NumTris(){ return m_tris.size(); } const TCHAR *Name(){ return m_name.c_str(); } RenderEngine::cDefaultVertex *VertData(){ return &m_verts[0]; } sTri *TriData(){ return &m_tris[0]; } }; #endif at the very top of the code there is a header file #include "stdafx.h" that includes this // stdafx.h : include file for standard system include files, // or project specific include files that are used frequently, but // are changed infrequently // #include "targetver.h" #define WIN32_LEAN_AND_MEAN // Exclude rarely-used stuff from Windows headers // Windows Header Files: #include <windows.h> // C RunTime Header Files #include <stdlib.h> #include <malloc.h> #include <memory.h> #include <tchar.h> #include "resource.h" #include "d3d10.h" #include "d3dx10.h" #include "dinput.h" #include "RenderEngine.h" #include "rModel.h" // TODO: reference additional headers your program requires here as you can see, RenderEngine.h comes before rModel.h #include "RenderEngine.h" #include "rModel.h" According to my knowledge, it should recognize it. But on the other hand, I am not really that great with organizing headers. Here my my RenderEngine Declaration. #pragma once #include "stdafx.h" #define MAX_LOADSTRING 100 #define MAX_LIGHTS 10 class RenderEngine { public: class rDefaultVertex { public: D3DXVECTOR3 m_vPosition; D3DXVECTOR3 m_vNormal; D3DXCOLOR m_vColor; D3DXVECTOR2 m_TexCoords; }; class rLight { public: rLight() { } D3DXCOLOR m_vColor; D3DXVECTOR3 m_vDirection; }; static HINSTANCE m_hInst; HWND m_hWnd; int m_nCmdShow; TCHAR m_szTitle[MAX_LOADSTRING]; // The title bar text TCHAR m_szWindowClass[MAX_LOADSTRING]; // the main window class name void DrawTextString(int x, int y, D3DXCOLOR color, const TCHAR *strOutput); //static functions static LRESULT CALLBACK WndProc(HWND hWnd, UINT message, WPARAM wParam, LPARAM lParam); static INT_PTR CALLBACK About(HWND hDlg, UINT message, WPARAM wParam, LPARAM lParam); bool InitWindow(); bool InitDirectX(); bool InitInstance(); int Run(); void ShutDown(); void AddLight(D3DCOLOR color, D3DXVECTOR3 pos); RenderEngine() { m_screenRect.right = 800; m_screenRect.bottom = 600; m_iNumLights = 0; } protected: RECT m_screenRect; //direct3d Members ID3D10Device *m_pDevice; // The IDirect3DDevice10 // interface ID3D10Texture2D *m_pBackBuffer; // Pointer to the back buffer ID3D10RenderTargetView *m_pRenderTargetView; // Pointer to render target view IDXGISwapChain *m_pSwapChain; // Pointer to the swap chain RECT m_rcScreenRect; // The dimensions of the screen ID3D10Texture2D *m_pDepthStencilBuffer; ID3D10DepthStencilState *m_pDepthStencilState; ID3D10DepthStencilView *m_pDepthStencilView; //transformation matrixs system D3DXMATRIX m_mtxWorld; D3DXMATRIX m_mtxView; D3DXMATRIX m_mtxProj; //pointers to shaders matrix varibles ID3D10EffectMatrixVariable* m_pmtxWorldVar; ID3D10EffectMatrixVariable* m_pmtxViewVar; ID3D10EffectMatrixVariable* m_pmtxProjVar; //Application Lights rLight m_aLights[MAX_LIGHTS]; // Light array int m_iNumLights; // Number of active lights //light pointers from shader ID3D10EffectVectorVariable* m_pLightDirVar; ID3D10EffectVectorVariable* m_pLightColorVar; ID3D10EffectVectorVariable* m_pNumLightsVar; //Effect members ID3D10Effect *m_pDefaultEffect; ID3D10EffectTechnique *m_pDefaultTechnique; ID3D10InputLayout* m_pDefaultInputLayout; ID3DX10Font *m_pFont; // The font used for rendering text // Sprites used to hold font characters ID3DX10Sprite *m_pFontSprite; ATOM RegisterEngineClass(); void DoFrame(float); bool LoadEffects(); void UpdateMatrices(); void UpdateLights(); }; The classes are defined within the class class rDefaultVertex { public: D3DXVECTOR3 m_vPosition; D3DXVECTOR3 m_vNormal; D3DXCOLOR m_vColor; D3DXVECTOR2 m_TexCoords; }; class rLight { public: rLight() { } D3DXCOLOR m_vColor; D3DXVECTOR3 m_vDirection; }; Not sure if thats good practice, but I am just going by the book. In the end, I just need a good way to organize it so that rModel recognizes RenderEngine. and if possible, the other way around.

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  • Problem loading java properties

    - by markovuksanovic
    I am trying to load properties from a file (test.properties) The code I use is as follows: URL url = getClass().getResource("../resources/test.properties"); properties.load(url.openStream()); But when executing the second line I get a NPE. (null pointer exception) I'm not sure what's wrong here... I have checked that the file exists at the location where URL points to... Any help is appreciated....

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  • ui tabs and position relative

    - by ntan
    Hi, I am using ui tabs a lot.In my last project i add an icon just before tabs and the tab links start a strange behavior, you can not click to change the tabs if you are above tab name BUT only when you are outside tab name. Here is the code <div style="float:left;display:inline;width:718px;padding:5px;border:1px solid #ececec"> <!--ICON just before TABs--> <div style="z-index:1;position:relative;top:30px;left:5px"> <img src="../graphics/icons/add.gif" onclick="AddTab();" href="javascript:void(0);" id="addNewTab"/> </div> <div id="tabs" > <ul > <li > <img src="../graphics/icons/x.gif" onclick="RemoveTab(this)" style="cursor: pointer;" /> <a href="#tab-1"><span id="tabContent-1"><span class="tabText" >TAB1</span></span></a> </li> <li > <img src="../graphics/icons/x.gif" onclick="RemoveTab(this)" style="cursor: pointer;" /> <a href="#tab-2"><span id="tabContent-2"><span class="tabText" >TAB2</span></span></a> </li> </ul> <div id="tab-1" > contents </div> <div id="tab-2" > contents </div> </div><!--tabs--> I know that ui.css has position relative for tabs .ui-tabs .ui-tabs-nav { list-style:none outside none; padding:0.2em 0.2em 0; position:relative; } and i dont know if meshing up with my icon. If i remove the position:relative from the icon (add.gif) everything works fine Any help is appreciated

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  • Freeing memory twice

    - by benjamin button
    Hi, AFAIK, freeing a NULL pointer will result in nothing. I mean nothing is being done by the compiler/no functionality is performed. Still, I do see some statements where people say that one of the scenarios where memory corruption can occur is "freeing memory twice"? Is this still true?

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  • How to get webcam video stream bytes in c++

    - by Mr Bell
    I am targeting windows machines. I need to get access to the pointer to the byte array describing the individual streaming frames from an attached usb webcam. I saw the playcap directshow sample from the windows sdk, but I dont see how to get to raw data, frankly, I don't understand how the video actually gets to the window. Since I don't really need anything other than the video capture I would prefer not to use opencv. Visual Studio 2008 c++

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  • Returning a shared library symbol table

    - by joemoe
    For instance: void* sdl_library = dlopen("libSDL.so", RTLD_LAZY); void* initializer = dlsym(sdl_library,"SDL_Init"); Assuming no errors, initializer will point to the function SD_Init in the shared library libSDK.so. However this requires knowing the symbol "SDL_Init" exists. Is it possibly to query a library for all its symbols? Eg, in this case it would return SDL_Init, the function pointer, and any other symbols exported by libSDL.so.

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  • Ajax load div , part of CSS not working

    - by user225228
    Hello, I'm using the ajax to load a div content, but the div content is not taking the CSS of the page. Example :- This link will load into <a href="#" onclick="javascript:loadAjax('test.html')">Test</a> <div id="result"> <table class="tablesorter"> <thead> <tr> <th>Header 1</th><th>Header 2</th> </tr> </thead> <tbody> <tr><td>Record 1</td><td>Desc 1</td></tr> </tbody> </table> </div> In my CSS : table.tablesorter thead tr th, table.tablesorter tfoot tr th { background-color: #e6EEEE; border: 1px solid #FFF; font-size: 8pt; padding: 4px; } table.tablesorter thead tr .header { background-image: url(bg.gif); background-repeat: no-repeat; background-position: center right; cursor: pointer; } In my test.html, it's the same table with different record : <table class="tablesorter"> <thead> <tr> <th>Header 1</th><th>Header 2</th> </tr> </thead> <tbody> <tr><td>Record 2</td><td>Desc 2</td></tr> </tbody> </table> The issue I'm facing is that before "test.html" is load, the CSS is fine. But after clicking on the link which suppose to loads test.html, the CSS background still shows but "cursor:pointer" and "background-image" not longer works. What should I do to make it work? Thanks in advance!

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  • Injected EJB sometimes Null

    - by carrier
    I'm using a stateless EJB via the @EJB annotation... most of the time everything works as it should but it seems that from time to time what is supposed to be injected resolves to a NULL causing a null pointer exception. What could cause this intermittent problem?

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  • IE Automation - How to Trap 'NewProcess' event

    - by dpb
    In Environment - Standard User, Win7x64, IE8 on opening Unprotected URL, IE 8 will first start a tab with low integrity and the swap out this tab with another tab of medium integrity. This is done behind the scene and the original IWebBrowser2 pointer is lost. I want to catch the 'NewProcess' Event which will get generated during this swap out, please help me how to go about this. Sample code can help me, me using C++ Ref - http://blogs.msdn.com/b/ieinternals/archive/2011/08/03/internet-explorer-automation-protected-mode-lcie-default-integrity-level-medium.aspx Thank You

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  • An interview question

    - by maddy
    Hi, The questions shown below is an interview question Q)You are given have a datatype, say X in C. The requirement is to get the size of the datatype, without declaring a variable or a pointer variable of that type, And, of course without using sizeof operator ! I am not sure if this question was asked before in SO. Thanks and regards Maddy

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  • Get specific process memory space

    - by Saul Rennison
    Hi, I have a pointer (void *) to a function and I want to know which process this function belongs to. I have no idea which way to go about it, but I think it's possible by using some form of VirtualQuery trickery. Any help would be appreciated. Thanks in advance,

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  • Moving a unit precisely along a path in x,y coordinates

    - by Adam Eberbach
    I am playing around with a strategy game where squads move around a map. Each turn a certain amount of movement is allocated to a squad and if the squad has a destination the points are applied each turn until the destination is reached. Actual distance is used so if a squad moves one position in the x or y direction it uses one point, but moving diagonally takes ~1.4 points. The squad maintains actual position as float which is then rounded to allow drawing the position on the map. The path is described by touching the squad and dragging to the end position then lifting the pen or finger. (I'm doing this on an iPhone now but Android/Qt/Windows Mobile would work the same) As the pointer moves x, y points are recorded so that the squad gains a list of intermediate destinations on the way to the final destination. I'm finding that the destinations are not evenly spaced but can be further apart depending on the speed of the pointer movement. Following the path is important because obstacles or terrain matter in this game. I'm not trying to remake Flight Control but that's a similar mechanic. Here's what I've been doing, but it just seems too complicated (pseudocode): getDestination() { - self.nextDestination = remove_from_array(destinations) - self.gradient = delta y to destination / delta x to destination - self.angle = atan(self.gradient) - self.cosAngle = cos(self.angle) - self.sinAngle = sin(self.angle) } move() { - get movement allocation for this turn - if self.nextDestination not valid - - getNextDestination() - while(nextDestination valid) && (movement allocation remains) { - - find xStep and yStep using movement allocation and sinAngle/cosAngle calculated for current self.nextDestination - - if current position + xStep crosses the destination - - - find x movement remaining after self.nextDestination reached - - - calculate remaining direct path movement allocation (xStep remaining / cosAngle) - - - make self.position equal to self.nextDestination - - else - - - apply xStep and yStep to current position - } - round squad's float coordinates to integer screen coordinates - draw squad image on map } That's simplified of course, stuff like sign needs to be tweaked to ensure movement is in the right direction. If trig is the best way to do it then lookup tables can be used or maybe it doesn't matter on modern devices like it used to. Suggestions for a better way to do it? an update - iPhone has zero issues with trig and tracking tens of positions and tracks implemented as described above and it draws in floats anyway. The Bresenham method is more efficient, trig is more precise. If I was to use integer Bresenham I would want to multiply by ten or so to maintain a little more positional accuracy to benefit collisions/terrain detection.

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  • Pointers to threads

    - by viswanathan
    Suppose i have pointer to a thread like this CWinThread *m_pThread = AfxBeginThread(StartThread, this, THREAD_PRIORITY_NORMAL, 0, 0); Now in my StartThread function assume i did all operations and the function returned like this UINT CClassThread::StartThread(LPVOID pVoid) { return true; } Will my m_pThread be invalid when the return statement is executed?

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