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  • Messing with the stack in assembly and c++

    - by user246100
    I want to do the following: I have a function that is not mine (it really doesn't matter here but just to say that I don't have control over it) and that I want to patch so that it calls a function of mine, preserving the arguments list (jumping is not an option). What I'm trying to do is, to put the stack pointer as it was before that function is called and then call mine (like going back and do again the same thing but with a different function). This doesn't work straight because the stack becomes messed up. I believe that when I do the call it replaces the return address. So, I did a step to preserve the return address saving it in a globally variable and it works but this is not ok because I want it to resist to recursitivy and you know what I mean. Anyway, i'm a newbie in assembly so that's why I'm here. Please, don't tell me about already made software to do this because I want to make things my way. Of course, this code has to be compiler and optimization independent. My code (If it is bigger than what is acceptable please tell me how to post it): // A function that is not mine but to which I have access and want to patch so that it calls a function of mine with its original arguments void real(int a,int b,int c,int d) { } // A function that I want to be called, receiving the original arguments void receiver(int a,int b,int c,int d) { printf("Arguments %d %d %d %d\n",a,b,c,d); } long helper; // A patch to apply in the "real" function and on which I will call "receiver" with the same arguments that "real" received. __declspec( naked ) void patch() { _asm { // This first two instructions save the return address in a global variable // If I don't save and restore, the program won't work correctly. // I want to do this without having to use a global variable mov eax, [ebp+4] mov helper,eax push ebp mov ebp, esp // Make that the stack becomes as it were before the real function was called add esp, 8 // Calls our receiver call receiver mov esp, ebp pop ebp // Restores the return address previously saved mov eax, helper mov [ebp+4],eax ret } } int _tmain(int argc, _TCHAR* argv[]) { FlushInstructionCache(GetCurrentProcess(),&real,5); DWORD oldProtection; VirtualProtect(&real,5,PAGE_EXECUTE_READWRITE,&oldProtection); // Patching the real function to go to my patch ((unsigned char*)real)[0] = 0xE9; *((long*)((long)(real) + sizeof(unsigned char))) = (char*)patch - (char*)real - 5; // calling real function (I'm just calling it with inline assembly because otherwise it seems to works as if it were un patched // that is strange but irrelevant for this _asm { push 666 push 1337 push 69 push 100 call real add esp, 16 } return 0; }

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  • How to find the real user home directory using python?

    - by nsharish
    I see that if we change the HOME(linux) or USERPROFILE(windows) environmental variable and run a python script, it returns the new value as the user home when I tried, os.environ['HOME'] os.exp Is there any way to find the real user home directory without relying on the environmental variable?. Thanx.

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  • NHibernate (or other worth recommendation ORM), real life example?

    - by migajek
    I'd like to learn database applications in C# and I'm about to select some framework. I heard many recommendations of NHibernate, however I haven't decided yet. Anyway, I'd like to know if there's any real-life example (with sources) of NHibernate in C#, to learn best practices etc.? I know all of them are probably covered in the docs, but working example helps a lot understanding the proper development pattern.

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  • How to format given string using regex?

    - by icoolninja
    So I have defined variables in such a way in my file: public static final String hello_world = "hello world" public static final String awesome_world = "awesome world" public static final String bye_world= "bye world" I have many declarations like that. Is it possible to format them as(All '=' in a line): public static final String hello_world = "hello world" public static final String awesome_world = "awesome world" public static final String bye_world = "bye world" I can't even think of a way to do it. Any kind of help is appreciated. P.S If it matters, I use sublime text 2.

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  • Why is this simple hello world PHP code not working?

    - by Silva
    class saySomething { var $helloWorld = 'hello world'; function sayHelloWorld($helloWorld) { echo $helloWorld; } } $saySomething = new saySomething(); $saySomething->sayHelloWorld(); the above gives this error: Warning: Missing argument 1 for saySomething::sayHelloWorld(), called in C:\xampp\htdocs\test.php on line 15 and defined in C:\xampp\htdocs\test.php on line 7

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  • Find UI components in real time run, under Android OS, it is possible?

    - by kimo
    Hi All, I want to know if I can find/reach UI components of running application under Android OS. it is possible to catch the Button/DDL/.. that was clicked by the user in real-time, example from other subject(web): In browser I can listen to the events and catch the DOM object that was clicked, in this way I can save the DOM object data. catching UI components that was changed by the user will give the option to save UI componentdata, and to perform the user actions automatic. Thanks.

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  • How to port real time video service by FMS from PC to mobile phone(symbian,android,iphone)?

    - by wamp
    Now I've set up the flash application to work in to stage: the uploading stage: uploading the stream from pc A's camera to FMS play stage: watch the real time stream from PC B's browser I want to make stage 2 work on mobile phones too. But currently it's using flash(actionscript) to connect and play the stream, which is not supported out of the box. How to port this kind of application to mobile phones?

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  • How to prevent regex from stopping at the first match of alternatives ?

    - by miket2e
    If I have the string hello world , how can I modify the regex world|wo|w so that it will match all of "world", "wo" and "w" rather than just the single first match of "world" that it comes to ? If this is not possible directly, is there a good workaround ? I'm using C# if it makes a difference: Regex testRegex = new Regex("world|wo|w"); MatchCollection theMatches = testRegex.Matches("hello world"); foreach (Match thisMatch in theMatches) { ... }

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  • Mandelbrot set not displaying properly

    - by brainydexter
    I am trying to render mandelbrot set using glsl. I'm not sure why its not rendering the correct shape. Does the mandelbrot calculation require values to be within a range for the (x,y) [ or (real, imag) ] ? Here is a screenshot: I render a quad as follows: float w2 = 6; float h2 = 5; glBegin(GL_QUADS); glVertex3f(-w2, h2, 0.0); glVertex3f(-w2, -h2, 0.0); glVertex3f(w2, -h2, 0.0); glVertex3f(w2, h2, 0.0); glEnd(); My vertex shader: varying vec3 Position; void main(void) { Position = gl_Vertex.xyz; gl_Position = gl_ModelViewProjectionMatrix * gl_Vertex; } My fragment shader (where all the meat is): uniform float MAXITERATIONS; varying vec3 Position; void main (void) { float zoom = 1.0; float centerX = 0.0; float centerY = 0.0; float real = Position.x * zoom + centerX; float imag = Position.y * zoom + centerY; float r2 = 0.0; float iter; for(iter = 0.0; iter < MAXITERATIONS && r2 < 4.0; ++iter) { float tempreal = real; real = (tempreal * tempreal) + (imag * imag); imag = 2.0 * real * imag; r2 = (real * real) + (imag * imag); } vec3 color; if(r2 < 4.0) color = vec3(1.0); else color = vec3( iter / MAXITERATIONS ); gl_FragColor = vec4(color, 1.0); }

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  • Delving into design patterns, and what that means for the Oracle user experience

    - by Kathy.Miedema
    By Kathy Miedema, Oracle Applications User Experience George Hackman, Senior Director, Applications User Experiences The Oracle Applications User Experience team has some exciting things happening around Fusion Applications design patterns. Because we’re hoping to have some new offerings soon (stay tuned with VoX to see what’s in the pipeline around Fusion Applications design patterns), now is a good time to talk more about what design patterns can do for the individual user as well as the entire company. George Hackman, Senior Director of Operations User Experience, says the first thing to note is that user experience is not just about the user interface. It’s about understanding how people do things, observing them, and then finding the patterns that emerge. The Applications UX team develops those patterns and then builds them into Oracle applications. What emerges, Hackman says, is a consistent, efficient user experience that promotes a productive workplace. Creating design patterns What is a design pattern in the context of enterprise software? “Every day, people use technology to get things done,” Hackman says. “They navigate a virtual world that reaches from enterprise to consumer apps, and from desktop to mobile. This virtual world is constantly under construction. New areas are being developed and old areas are being redone. As this world is being built and remodeled, efficient pathways and practices emerge. “Oracle's user experience team watches users navigate this world. We measure their productivity and ask them about their satisfaction. We take the most efficient, most productive pathways from the enterprise and consumer world and turn them into Oracle's user experience patterns.” Hackman describes the process as combining all of the best practices from every part of a user’s world. Members of the user experience team observe, analyze, design, prototype, and measure each work task to find the best possible pattern for a particular work flow. As the team builds the patterns, “we make sure they are fully buildable using Oracle technology,” Hackman said. “So customers know they can use these patterns. There’s no need to make something up from scratch, not knowing whether you can even build it.” Hackman says that creating something on a computer is a good example of a user experience pattern. “People are creating things all the time,” he says. “On the consumer side, they are creating documents. On the enterprise side, they are creating expense reports. On a mobile phone, they are creating contacts. They are using different apps like iPhone or Facebook or Gmail or Oracle software, all doing this creation process.” The Applications UX team starts their process by observing how people might create something. “We observe people creating things. We see the patterns, we analyze and document, then we apply them to our products. It might be different from phone to web browser, but we have these design patterns that create a consistent experience across platforms, and across products, too. The result for customers Oracle constantly improves its part of the virtual world, Hackman said. New products are created and existing products are upgraded. Because Oracle builds user experience design patterns, Oracle's virtual world becomes both more powerful and more familiar at the same time. Because of design patterns, users can navigate with ease as they embrace the latest technology – because it behaves the way they expect it to. This means less training and faster adoption for individual users, and more productivity for the business as a whole. Hackman said Oracle gives customers and partners access to design patterns so that they can build in the virtual world using the same best practices. Customers and partners can extend applications with a user experience that is comfortable and familiar to their users. For businesses that are integrating different Oracle applications, design patterns are key. The user experience created in E-Business Suite should be similar to the user experience in Fusion Applications, Hackman said. If a user is transitioning from one application to the other, it shouldn’t be difficult for them to do their work. With design patterns, it isn’t. “Oracle user experience patterns are the building blocks for the virtual world that ensure productivity, consistency and user satisfaction,” Hackman said. “They are built for the enterprise, but incorporate the best practices from across the virtual world. They empower productivity and facilitate social interaction. When you build with patterns, you get all the end-user benefits of less training / retraining from the finished product. You also get faster / cheaper development.” What’s coming? You can already access design patterns to help you build Dashboards with OBIEE here. And we promised you at the beginning that we had something in the pipeline on Fusion Applications design patterns. Look for the announcement about when they are available here on VoX.

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  • Where can work-at-home coders go to find other coders to real-time chat with and get support like they were on a large team at an established company?

    - by cypherblue
    I used to work in an office surrounded by a large team of programmers where we all used the same languages and had different expertises. Now that I am on my own forming a startup at home, my productivity is suffering because I miss having people I can talk to for specific help, inspiration and reality checks when working on a coding problem. I don't have access to business incubators or shared (co-working) office spaces for startups so I need to chat with people virtually. Where can I go for real-time chat with other programmers and developers (currently I'm looking for people developing for the web, javascript and python) for live debugging and problem-solving of the tasks I am working on? And what other resources can I use to get fellow programmer support?

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  • Android "Hello World" tutorial program. Error: [Parse Error] There is a problem parsing the package

    - by ConfusedDeveloper
    Today I decided to start developing for the Android OS. I went on their website, downloaded all the required software (Eclipse, The Android SDK, ADT Plugin for Eclipse etc.). I followed the "Hello World" tutorial supplied (link text). I have it using the Android SDK 2.1. The program worked almost flawlessly. It runs fine on the Android emulator, but doesn't install on any Android phones. I don't own an Android phone, so I had three of my friends try to install the program on theirs. The phones we used were: ROOTED G1 running 2.1 Droid running 2.1 Another Droid running 2.1 I emailed the .apk to myself in gmail, and accessed it via the Android emulator. It ran and installed the package just fine. However, when my friends tried to install it on their phones, they were all met with this error: "[Parse Error] There is a problem parsing the package" I'm wondering if anyone has any suggestions as to what may be wrong. Thanks for your help.

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  • Is there any real benefit to using ASP.Net Authentication with ASP.Net MVC?

    - by alchemical
    I've been researching this intensely for the past few days. We're developing an ASP.Net MVC site that needs to support 100,000+ users. We'd like to keep it fast, scalable, and simple. We have our own SQL database tables for user and user_role, etc. We are not using server controls. Given that there are no server controls, and a custom membershipProvider would need to be created, where is there any benefit left to use ASP.Net Auth/Membership? The other alternative would seem to be to create custom code to drop a UniqueID CustomerID in a cookie and authenticate with that. Or, if we're paranoid about sniffers, we could encrypt the cookie as well. Is there any real benefit in this scenario (MVC and customer data is in our own tables) to using the ASP.Net auth/membership framework, or is the fully custom solution a viable route?

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  • Lock-free multi-threading is for real threading experts...

    - by vdhant
    I was reading through an answer that Jon Skeet gave to a question and in it he mentioned this: As far as I'm concerned, lock-free multi-threading is for real threading experts, of which I'm not one. Its not the first time that I have heard this, but I find very few people talking about how you actually do it if you are interested in learning how to write lock-free multi-threading code. So my question is besides learning all you can about threading, etc where do you start trying to learn to specifically write lock-free multi-threading code and what are some good resources. Cheers

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  • What are the real-world benefits of declarative-UI languages such as XAML and QML?

    - by Stu Mackellar
    I'm currently evaluating QtQuick (Qt User Interface Creation Kit) which will be released as part of Qt 4.7. QML is the JavaScript-based declarative language behind QtQuick. It seems to be a very powerful concept, but I'm wondering if anybody that's made extensive use of other, more mature declarative-UI languages like XAML in WPF or Silverlight can give any insight into the real-world benefits that can be gained from this style of programming. Various advantages are often cited: Speed of development Forces separation between presentation and logic Better integration between coders and designers UI changes don't require re-compilation Also, are there any downsides? A few potential areas of concern spring to mind: Execution speed Memory usage Added complexity Are there any other considerations that should be taken into account?

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