main

I'm having some difficulty understanding how the OS passes data from the address space of a parent process to the address space of a child process. Namely, in a C program, where is argc and argv stored upon being passed into main? I understand how argv is essentially a double pointer. What I'm not understanding is what the OS does with those values after loading them into the kernel. After creating an address space for the child process does it push these values on the stack of the new space? We obviously don't want to pass in pointers to another address space. For the record, I'm working with

I would like to know if there is a simple way to access the main window or view in IOS. Something similar to: [UIScreen mainScreen] Thank you. Try : UIWindow *frontWindow = [[[UIApplication sharedApplication] windows] lastObject]; or simply : UIWindow *frontWindow = [[UIApplication sharedApplication] keyWindow]; The main window is best found using UIWindow * mainWindow = [UIApplication sharedApplication].windows.firstObject; Using keyWindow can return a keyboard or UIAlertView window, which lie above your application window. If you have a pointer to some subview in the window, you can easily

I have some code: object Main extends App { val NameTemplate = """^([A-Za-z]+)_(\d+)\.png""".r override def main (args:Array[String]) { // Why is NameTemplate null here? } } Why is NameTemplate not initialized within the main method? tenshi If you are using App trait, then you don't need to override main method - just write your code in the body of the object : object Main extends App { val NameTemplate = """^([A-Za-z]+)_(\d+)\.png""".r println(NameTemplate) val NameTemplate(name, version) = args(0) println(name + " v" + version) } It works because App trait extends DelayedInit trait which has

When I wrote the following code and executed it, the compiler said deprecated conversion from string constant to char* int main() { char *p; p=new char[5]; p="how are you"; cout<< p; return 0; } It means that I should have written const char * . But when we pass arguments into main using char* argv[] we don't write const char* argv[] . Why? Because ... argv[] isn't const. And it certainly isn't a (static) string literal since it's being created at runtime. You're declaring a char * pointer then assigning a string literal to it, which is by definition constant; the actual data is in read-only