call

I am quite new to C and C++. But I have some C++ functions which I need to call them from C. I made an example of what I need to do main.c : #include "example.h" #include <stdio.h> int main(){ helloWorld(); return 0; } example.h : #ifndef HEADER_FILE #define HEADER_FILE #ifdef __cplusplus extern "C" { #endif void helloWorld(); #ifdef __cplusplus } #endif #endif example.cpp : #include <iostream.h> void helloWorld(){ printf("hello from CPP"); } It just doesn't work. I still receive the error of undefined reference to _helloWorld in my main.c . Where is the the problem? Short answer: example.cpp

I've been sitting over this the whole day and Im a little tired already so please excuse me being brief. Im new to python. I just rewrote a working program, into a bunch of functions in a class and everything messed up. I dont know if it's me but I'm very surprised I couldn't find a beginner's tutorial on how to handle classes on the web so I have a few questions. First of all, in the __init__ section of the class I have declared a bunch of variables with self.variable=something . Is it correct that I should be able to access/modify these variables in every function of the class by using self

To make a normal (near direct relative) call to an absolute address, in NASM or AT&T syntax you write call 0x1234567 , and the assembler + linker take care of calculating a rel32 to reach that target from wherever the linker puts the call instruction. e.g. on Linux assembling that into a static 64-bit ELF executable with yasm -felf64 foo.asm && ld foo.o -o foo , then disassembled with objdump -drwC -Mintel foo gives you: foo: file format elf64-x86-64 Disassembly of section .text: 0000000000400080 <_start>: 400080: e8 e2 44 e3 00 call 1234567 <_end+0xc344df> The linker calculated the right

Basically what I want to do is get a start button to initiate a method running in another class and acting on another object. My code for the listener: button1a.addActionListener(new ActionListener() { public void actionPerformed (ActionEvent event) { // Figure out how to make this work //sim.runCastleCrash(); } } ); My code for the other class: public static void main(String[] args) { CastleCrash sim; sim = new CastleCrash(); } and public void runCastleCrash() { System.out.println("Castle Crash is beginning..."); //Other method parts here to be added } I get the feeling this can't be too hard

I have two components. I want to call a method of the first component from the second component. How can I do it? Here is my code. First Component class Header extends React.Component{ constructor(){ super(); } checkClick(e, notyId){ alert(notyId); } } export default Header; Second Component class PopupOver extends React.Component{ constructor(){ super(); // here i need to call Header class function check click.... // How to call Header.checkClick() from this class } render(){ return ( <div className="displayinline col-md-12 "> Hello </div> ); } } export default PopupOver; You can do something

I want to call class2 from class1 but class2 doesn't have a main function to refer to like Class2.main(args); Suposse you have Class1 public class Class1 { //Your class code above } Class2 public class Class2 { } and then you can use Class2 in different ways. Class Field public class Class1{ private Class2 class2 = new Class2(); } Method field public class Class1 { public void loginAs(String username, String password) { Class2 class2 = new Class2(); class2.invokeSomeMethod(); //your actual code } } Static methods from Class2 Imagine this is your class2. public class Class2 { public static void

What are some alternatives to the x86 call instruction? Maybe something like a push of the return address then a jump? Also is their a command for obtaining the current position in memory? CALL actually does this for you for example CALL my_func would do something like push ret_address jmp my_func and a subsequent RET call would just use the address you just pushed to JMP back in a sense. Is there a specific reason that you don't want to use CALL or is it not available for you? For current position in memory you can try to read EIP register (can't write to it). You can just push a dword value