How to call one static method from another?
Hi, Just can't found information about "this" for static methods. Can anyone explain how to call current class from static methods? For example I have some class and I need to call some static method of current class from another static method. I don't like to use full class name for that, but I didn't know what need to use instead of "this". I sure it must be something like "self". :(
Re: How to call one static method from another?
May be my question was not enought clean...
this is example of code:
```
class ClassName {
public static void function method1()
{
// do something
// and now I need to call other static method
ClassName.method2(); // What I can use insted of full
class name?
// Like "self.method2()"
}
public static void function method2()
{
//...
}
}
```
Re: How to call one static method from another?
On Tuesday, 14 June 2016 at 07:35:36 UTC, Andrea Fontana wrote:
On Tuesday, 14 June 2016 at 07:20:47 UTC, Konstantin Kutsevalov
wrote:
May be my question was not enought clean...
this is example of code:
```
class ClassName {
public static void function method1()
{
// do something
// and now I need to call other static method
ClassName.method2(); // What I can use insted of full
class name?
// Like "self.method2()"
}
public static void function method2()
{
//...
}
}
```
Simply:
method2();
Anyway I guess you mean public static void method1() { }
without "function"
Andrea
Yep, it's my mistake about "function" :)
Thanks!
How to get a screenshot?
Hello everyone, do anybody know how to get screenshot (for now in Linux only)? May be some library , examples?
Re: How to get a screenshot?
On Wednesday, 21 September 2016 at 16:36:32 UTC, Adam D. Ruppe
wrote:
On Wednesday, 21 September 2016 at 16:33:58 UTC, Konstantin
Kutsevalov wrote:
do anybody know how to get screenshot (for now in Linux only)?
May be some library , examples?
simplest might be to just call out to `shellExec("import
-window root filename.png");` and it will write the file.
Hmm, that's good idea as fast solution. Thank you Adam.
Re: How to get a screenshot?
On Thursday, 22 September 2016 at 16:09:23 UTC, Antonio Corbi wrote: On Thursday, 22 September 2016 at 07:50:07 UTC, Antonio Corbi wrote: Ok, took the time to translate it to D and created a github repo to clone. You can download and try it from: https://github.com/antoniocorbibellot/dsshot Hope It helps you. Antonio Thank you Antonio, I'll try :)
Re: How to get a screenshot?
On Thursday, 22 September 2016 at 16:09:23 UTC, Antonio Corbi wrote: Ok, took the time to translate it to D and created a github repo to clone. You can download and try it from: https://github.com/antoniocorbibellot/dsshot Hope It helps you. Antonio Hey! It really works! https://github.com/antoniocorbibellot/dsshot/blob/master/source/app.d Thank you!
Re: How to get a screenshot?
This is example:
```
import std.stdio;
import gtk.Main;
import gtk.MainWindow;
import gtk.VBox, gtk.Label, gtk.Button;
import gdk.Gdk;
import gdk.Window;
import gdk.Pixbuf;
private import stdlib = core.stdc.stdlib : exit;
int main(string[] args)
{
Main.init(args);
new ApMainWindow();
Main.run();
return 0;
}
class ApMainWindow : MainWindow
{
this()
{
super("Screen Capture");
setTitle("Screen Capture Example");
setDefaultSize(250, 120);
VBox box = new VBox(false, 2);
box.add(new Button("ScreenShot", &screenSave));
box.add(new Button("Exit", &exitProg));
add(box);
showAll();
}
void screenSave(Button button)
{
Window win = Window.getDefaultRootWindow();
int width = win.getWidth;
int height = win.getHeight;
Pixbuf screenshot = getFromWindow(win, 0, 0, width, height);
screenshot.savev("screenshot.png", "png", null, null);
}
void exitProg(Button button)
{
stdlib.exit(0);
}
}
```
Re: Easy sockets - don't exist yet?
On Monday, 26 September 2016 at 23:40:10 UTC, Vincent wrote: Hello, guys! I was very surprised that module 'socketstream' was deprecated. Usually if something become obsolete, there is some perfect replacement! But my digging in Inet and forums gave nothing, but "outdated" examples with 'SocketStream' class. So first question is WHAT Phobos has to replace SocketStream? Hello, I'm agree with your main question. This looks very good http://dsfml.com/docs/sockets.html, but, there is no any answer for the question. Why 'socketstream' was deprecated when no any replacement modules? It looks strange, like you are removing feature from your app because his code old and don't write new code for same feature, and just say to users: no feature anymore, haha. So anyone know the answer?
Re: Easy sockets - don't exist yet?
On Monday, 10 October 2016 at 02:54:09 UTC, Jonathan M Davis wrote: On Monday, October 10, 2016 01:43:54 Konstantin Kutsevalov via So, it's simply gone. But if someone wants to propose a replacement, they're certainly still free to do so. - Jonathan M Davis I see, thank you for answer
Re: Easy sockets - don't exist yet?
On Monday, 10 October 2016 at 07:37:48 UTC, Bauss wrote: Wrote some pretty simple sockets that you could use (Based on vibe.d though.) https://github.com/bausshf/cheetah Hi, Yes I saw it, but not sure. Does it make sense to use vibe.d only for sockets. I mean, it like a web framework with many dependencies etc...
is there "this"?
The question is simple.
Is there something like "this" word for classes?
For example:
```
class CLS {
int numberValue;
public this(numberValue)
{
// how can I put the local numberValue to class property?
// in some prog language I can do like:
// this.numberValue = numberValue;
}
}
```
Re: is there "this"?
On Wednesday, 2 November 2016 at 02:20:43 UTC, rikki cattermole
wrote:
On 02/11/2016 3:17 PM, Konstantin Kutsevalov wrote:
The question is simple.
Is there something like "this" word for classes?
For example:
```
class CLS {
int numberValue;
public this(numberValue)
{
// how can I put the local numberValue to class
property?
// in some prog language I can do like:
// this.numberValue = numberValue;
}
}
```
You forgot an int in the arguments but otherwise that would
work fine with your line uncommented.
yes I missed "int", but it's just an example.
so if I'll write "this.property = value" it will work?
Re: is there "this"?
On Wednesday, 2 November 2016 at 02:33:10 UTC, Konstantin
Kutsevalov wrote:
On Wednesday, 2 November 2016 at 02:20:43 UTC, rikki cattermole
wrote:
On 02/11/2016 3:17 PM, Konstantin Kutsevalov wrote:
The question is simple.
Is there something like "this" word for classes?
For example:
```
class CLS {
int numberValue;
public this(numberValue)
{
// how can I put the local numberValue to class
property?
// in some prog language I can do like:
// this.numberValue = numberValue;
}
}
```
You forgot an int in the arguments but otherwise that would
work fine with your line uncommented.
yes I missed "int", but it's just an example.
so if I'll write "this.property = value" it will work?
I tested already and it really works, thank you.
I asked that because I tried once to use "this" in past but I got
error. So I asked on some forum "how to get property of class?"
and peoples said that I may use just a name of property. So I
thought that there isn't "this" word.
system's "kill " signal
Hi, is there a way to catch system signal of "kill" command or "shutdown"? PS: are there some other ways also to send signals to running a D application?
Re: is there "this"?
On Thursday, 3 November 2016 at 13:40:11 UTC, Steven Schveighoffer wrote: On 11/2/16 4:43 AM, Jonathan M Davis via Digitalmars-d-learn In the case of the original post, however, you *need* to use this.value, as the parameter masks the member of the same name. Using 'this' removes ambiguity. This is a typical pattern seen in many languages. Often the intuitive name of a member is the same name as you want for the parameter of the constructor. -Steve I'd like to use "this" because when I see something like "this.pumpurum = 10;" then I understand that "pumpurum" is property of class and not some local variable :)
Re: system's "kill " signal
On Saturday, 5 November 2016 at 07:52:53 UTC, Basile B. wrote: On Saturday, 5 November 2016 at 06:17:51 UTC, Basile B. wrote: 3rd option, from my Windows times I remember that people tend to use launchers to handle the real application, i.e a process that launches the main process. Then the launcher can have a thread that checks the PID (like in "After Term..."). If SIGKILL isn't handled by a signal() callback then this could be an option. Do you have to check if a server crashes or something like that ? not a system crash. just a signal of sistems shutdown or process kill.
Re: system's "kill " signal
On Sunday, 6 November 2016 at 16:05:44 UTC, Konstantin Kutsevalov wrote: On Saturday, 5 November 2016 at 07:52:53 UTC, Basile B. wrote: On Saturday, 5 November 2016 at 06:17:51 UTC, Basile B. wrote: 3rd option, from my Windows times I remember that people tend to use launchers to handle the real application, i.e a process that launches the main process. Then the launcher can have a thread that checks the PID (like in "After Term..."). If SIGKILL isn't handled by a signal() callback then this could be an option. Do you have to check if a server crashes or something like that ? not a system crash. just a signal of sistems shutdown or process kill. *of system
Re: system's "kill " signal
On Saturday, 5 November 2016 at 06:17:51 UTC, Basile B. wrote: On Saturday, 5 November 2016 at 02:24:00 UTC, Konstantin Kutsevalov wrote: Hi, is there a way to catch system signal of "kill" command or "shutdown"? During the Run-time: You can register a signal callback, like in this sample (hit CTRL+C once running in a terminal): After termination: == if (tryWait(PID)[0] == true) then the value carried by tryWait(PID)[1] will tell you if the process has exited because of a signal whatever it's, e.g SIGKILL, SIGTERM, SIGINT, ... Thank you!
Thread (spawn) for object's method
Is there a way to make new thread for class method? E.g. I have some class and I need to run one of them method in new thread. I found wxamples only with function...
Re: Thread (spawn) for object's method
On Tuesday, 8 November 2016 at 06:40:32 UTC, Basile B. wrote:
On Monday, 7 November 2016 at 16:15:44 UTC, Konstantin
Kutsevalov wrote:
Is there a way to make new thread for class method?
E.g. I have some class and I need to run one of them method in
new thread.
I found wxamples only with function...
import core.thread;
class Foo
{
void method(){}
}
void main()
{
Foo foo = new Foo;
Thread t = new Thread(&foo.method);
}
oh, so simple... :) thank you!
Question about dsfml.system.err
I need to see errors from dsfml.system.err, but it doesn't write
to terminal as I expected.
The general problem is that I cannot listen any port by
tcplistener. And listen method is:
Status accept(TcpSocket socket)
{
import dsfml.system.string;
Status toReturn = sfTcpListener_accept(sfPtr, socket.sfPtr);
err.write(dsfml.system.string.toString(sfErr_getOutput()));
return toReturn;
}
so, as you can see, there is "err.write". I need to see which
error is wrining ro "err"...
Is it possible to redeclate "err" File() object?
:(
Re: Question about dsfml.system.err
ADD:
I tried to open other stream in main()
```
...
import dsfml.system.err;
int main(string[] args)
{
err.open("errors.log", "a");
err.write("test\n");
}
...
```
but as can I see, that hasn't any effect for tcplistener module...
Re: Question about dsfml.system.err
On Tuesday, 8 November 2016 at 16:34:04 UTC, Konstantin
Kutsevalov wrote:
ADD:
I tried to open other stream in main()
```
...
import dsfml.system.err;
int main(string[] args)
{
err.open("errors.log", "a");
err.write("test\n");
}
...
```
but as can I see, that hasn't any effect for tcplistener
module...
OK ... problem with tcplistener solved, just a code mistake. But
the question is actual.
Re: Question about dsfml.system.err
On Tuesday, 8 November 2016 at 19:00:15 UTC, Steven Schveighoffer
wrote:
On 11/8/16 11:48 AM, Konstantin Kutsevalov wrote:
On Tuesday, 8 November 2016 at 16:34:04 UTC, Konstantin
Kutsevalov wrote:
ADD:
I tried to open other stream in main()
```
...
import dsfml.system.err;
int main(string[] args)
{
err.open("errors.log", "a");
err.write("test\n");
}
...
```
but as can I see, that hasn't any effect for tcplistener
module...
OK ... problem with tcplistener solved, just a code mistake.
But the
question is actual.
I can honestly say, I don't know what dsfml is or any of the
code you have posted.
-Steve
oh, it's ok because it's all work fine, I just was too
inattentive.
Correct way to create singleton?
Hi, what is a correct (and simple) way to create an singleton?
This is how I see that now:
```
class ApMessageRouter
{
static ApMessageRouter instance = null;
private this() { } // for disable constructor to use from
outside
public ApMessageRouter getInstance()
{
if (this.instance is null) {
this.instance = new ApMessageRouter();
}
return this.instance;
}
}
```
Thank you.
Re: Correct way to create singleton?
On Thursday, 10 November 2016 at 17:22:48 UTC, Anonymouse wrote: On Thursday, 10 November 2016 at 17:17:51 UTC, Konstantin Kutsevalov wrote: Hi, what is a correct (and simple) way to create an singleton? https://wiki.dlang.org/Low-Lock_Singleton_Pattern great!
How to correct share data between threads?
I need to receiving data in main thread and send its to other
thread for processing. There is a simple (but wrong) code for
example.
What need I to change to make it correct?
```
import std.stdio, std.string, std.array, core.thread,
std.datetime, std.conv;
int main() {
Pumpurum pp = new Pumpurum();
Thread ppt = new Thread(&pp.processingData);
ppt.start();
while(pp.waitData())
{
// some operations may be
}
writeln("finished main");
return 0;
}
class Pumpurum
{
private string[string] Data;
private string[string] Result;
private bool _quit = false;
private int _counter = 0;
bool waitData()
{
// waits for new data and adds to Data
string key;
string line = readln(); // just for example, in real its will
be data from several socket connections
if (line !is null) {
if (line == "quit\n") {
this._quit = true;
return false;
}
key = Clock.currTime().toString() ~ " " ~
to!string(this._counter);
this.Data[key] = line; // adds new data to "Data"
}
return true;
}
void processingData()
{
string key, value;
while(!this._quit) {
if (this.Data.length > 0) {
// todo checks the "Data" for some data, processing its and
saves a result to "Result"
foreach (key, value; this.Data) {
writeln(value); // some processing :)
this.Result[key] = value;
this.Data.remove(key);
}
}
}
writeln("finished processing");
}
}
```
Any advice may help. Thank you.
Re: How to correct share data between threads?
On Saturday, 19 November 2016 at 19:04:12 UTC, Nicolas Gurrola
wrote:
On Saturday, 19 November 2016 at 17:29:30 UTC, Konstantin
Kutsevalov wrote:
I need to receiving data in main thread and send its to other
thread for processing. There is a simple (but wrong) code for
example.
What need I to change to make it correct?
```
import std.stdio, std.string, std.array, core.thread,
std.datetime, std.conv;
int main() {
Pumpurum pp = new Pumpurum();
Thread ppt = new Thread(&pp.processingData);
ppt.start();
while(pp.waitData())
{
// some operations may be
}
writeln("finished main");
return 0;
}
class Pumpurum
{
private string[string] Data;
private string[string] Result;
private bool _quit = false;
private int _counter = 0;
bool waitData()
{
// waits for new data and adds to Data
string key;
string line = readln(); // just for example, in real its
will be data from several socket connections
if (line !is null) {
if (line == "quit\n") {
this._quit = true;
return false;
}
key = Clock.currTime().toString() ~ " " ~
to!string(this._counter);
this.Data[key] = line; // adds new data to "Data"
}
return true;
}
void processingData()
{
string key, value;
while(!this._quit) {
if (this.Data.length > 0) {
// todo checks the "Data" for some data, processing its
and saves a result to "Result"
foreach (key, value; this.Data) {
writeln(value); // some processing :)
this.Result[key] = value;
this.Data.remove(key);
}
}
}
writeln("finished processing");
}
}
```
Any advice may help. Thank you.
I'd recommend using std.concurrency or std.parallelism instead
of core.thread, as they're higher level APIs. You probably want
to check out std.parallelism first to see if it has what you
need. Otherwise, the generic messaging API of std.concurrency
should be easier to use than core.thread while still being very
flexible.
Ok, thank you. But I cannot to find good example. May be you know
some good article about it?
