call | 易学教程

How does `lua_load()` work?

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问题 How would I load a chunk of Lua code as a char and run it using this function? If not, what other function can I use and how does lua_load() work? 回答1: Use luaL_dofile and luaL_dostring to load and run Lua code. Read their definitions in lauxlib.h to see how these are implemented in terms of lower-level primitives. To learn how lua_load works, read the code of luaL_loadfile and luaL_loadstring . 来源： https://stackoverflow.com/questions/4272231/how-does-lua-load-work

consequences of calling a function with fewer arguments in C?

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问题 I wrote a function that that takes some argument and a pointer argument . when calling the function , sometimes I need to pass along the pointer for use inside the function and sometimes I don't . what are the consequences of calling a function with fewer arguments ? it compiles correctly and during runtime its still fine , but is this good programming ? is it better if I call the function with a dummy variable ? Thanks and sorry for beginner question . 回答1: If you call a function with too

Change attribute after each object calling

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问题 I'm trying to figure out how to change some value after each call of the object. I thougt that call () function is executed after each call. This should be a simple counter class which decreases value attribute after being called. class counter(): def __init__(self,value): self.value = value def __call__(self): self.value -= 1 count = counter(50) print count.value print count.value >> 50 >> 50 <-- this should be 49 What am I doing wrong? 回答1: If you're not committed to classes, you could use

Magento: How to include a php call in the CMS pages

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问题 Following the instructions from this page: http://www.magento.cc/how-to-use-php-on-a-cms-page.html 1) i declared the module in the app/etc/modules : <?xml version="1.0"?> <config> <modules> <Stock_status> <active>true</active> <codePool>local</codePool> </Stock_status> </modules> </config> 2) Then i created the config.xml in app\code\local\Stock\status\Custom\etc with these contents in it: <?xml version="1.0"?> <config> <global> <blocks> <Stock_status> <class>Stock_status_Block</class> <

The return address in the assembly code

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问题 The assembly code goes like this: call next next: popl %eax I thought after call next , the return address will be pushed onto the stack, right? But in the above code, what's the return address? 回答1: After that code executes %eax will have the address of label "next" the call branches to the target which happens to be the next sequential instruction and pushes the return address, which is always the address of the next sequential instruction the popl will pop the return address from the stack

UWP use skype to call number

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问题 I want my c# UWP App to support calling numbers. When I'm on W10 mobile I want it to use W10 PhoneCall API normal (this is working) Windows.ApplicationModel.Calls.PhoneCallManager.ShowPhoneCallUI(number, name); but on W10 Desktop/PC I won't have a GSM provider, so I thought, maybe use skype to call the number, the user pressed. Is that possible via UWP? Maybe similar like opening websites: await Windows.System.Launcher.LaunchUriAsync(new Uri(website)); 回答1: Yes， it's possible and you're right

static <T extends Number & Comparable<? super Number>>

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问题 I have following class with one static method: public class Helper { public static <T extends Number & Comparable<? super Number>> Boolean inRange(T value, T minRange, T maxRange) { // equivalent (value >= minRange && value <= maxRange) if (value.compareTo(minRange) >= 0 && value.compareTo(maxRange) <= 0) return true; else return false; } } I try to call this method: Integer value = 2; Integer min = 3; Integer max = 8; Helper.inRange(value, min, max) ; Netbeans compiler show me this error

Calling onResume in Android's activity

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问题 is it ok in an activity's procedure to force the onResume event by calling this.OnResume() ? Or should I implement another procedure that's called by both OnResume and by the first member ? 回答1: Implement another procedure that's called in your override of onResume() . The latter is not intended to be called by you, it's a convenience method that tidies up or readies the activity when its state changes to resume . A lot like onCreate() through to onDestroy() . 回答2: What @SK9 said, but also

How to call variables from a list of variable names in R

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I have of list of variable names. list = c("smoke", "ptd", "ht", "ui", "racecat", "visit") I want to make a series of plots like this. plot(low[somevariable=="0"] ~ age[somevariable=="0"]) I'd like to replace somevariable with each of the variable name in the list. For example, plot(low[smoke=="0"] ~ age[smoke=="0"]) plot(low[ptd=="0"] ~ age[ptd=="0"]) ...... plot(low[visit=="0"] ~ age[visit=="0"]) I've tried to create a for-loop and use a variety of things to replace somevariable, such as list[i], paste(list[i]), substitute(list[i]), parse(list[i]) But none of them works. I would really

x86 function call types

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I'm new in x86. My question is about function calls. As far as i know there is three function call types: short call (0xe8), far call (0x9a) and near call (0x??). Some call short call a relative call (ip += arg / cs = inv) and far call an absolute call (ip = arg / cs = arg), but what about near call (ip = ? / cs = ?). Some say that calling function far (9a) is almost certainly wrong on 32-bit systems. Why? Doesn't x86 mean 32-bit system? Is far call's argument a flat address (the one we use in c++ or other languages) or cs:ip notated and how do i convert a plain address into cs:ip form? Is