some questions about adding text by "A" on K line chart and time counting.
1. a question about adding text on "K" line chart by text tool--"A" on MT4
when I add the text--"Words on Test" on "M15" line chart as below:
then I change to "H1" line chart, and I get the below image:
in the fact, I add "Word on Test" on "M15" line chart and just want these words showed on "M15" line chart rather than any other line chart.
My question is : how shall I do for this?
for example, I want to send an order after 10 minutes by an EA which I have set it well for this.
Now I am reviewing "M15" line chart and execute above EA, then 10 minutes later, the order can be sent; that is ok.
But if 5 minutes later, I go to "H1" line chart, then the time is counted from 0 rather than 5, so the order should be sent after 15 minutes from the very beginning rather than 10 minutes, even if I set the variable of counting time as " extern" variable outside of function--start().I want to the order should be sent after 10 minutes, whatever I go to any line chart within the 10 minutes.
My question is : how shall I do for this?
When you change timeframe the EA will reinitialise and your start time variable gets reset so an order is not placed for a additional 10 minutes . . . the simple solution is to not change timeframes. If you need to review a H1 chart open a new H1 chart . . . if this is not to your liking then you need to explain what triggers the start time ? is it from the time the EA is attached or some other event ?
yes, it is from the time the EA is attached.
the code is as below:
#include <WinUser32.mqh> #property show_inputs //--- input parameters extern int time_count=1; extern datetime time_current; //+------------------------------------------------------------------+ //| expert initialization function | //+------------------------------------------------------------------+ int init() { //---- if (time_count==1) { time_current=TimeCurrent(); time_count--; } //---- return(0); } //+------------------------------------------------------------------+ //| expert deinitialization function | //+------------------------------------------------------------------+ int deinit() { //---- //---- return(0); } //+------------------------------------------------------------------+ //| expert start function | //+------------------------------------------------------------------+ int start() { Print("time_passed(Minutes) is:",(TimeCurrent()-time_current)/60); .... ... }
I think the variable will never be initialized again for above code, but it is. how shall i do?
yes, it is from the time the EA is attached.
the code is as below:
https://www.mql5.com/en/forum/143987
thank you,these problems have been resolved.
I have another question:
what is the difference between "A" and "B" as below?
A:
bool isFirst = true; datetime time_current; int init(){ if(isFirst) { isFirst = false; time_current=TimeCurrent(); }
B:
extern bool isFirst = true; extern datetime time_current; int init(){ if(isFirst) { isFirst = false; time_current=TimeCurrent(); }
thank you,these problems have been resolved.
I have another question:
what is the difference between "A" and "B" as below?
extern
You inverted A and B.
extern bool isFirst = true; extern datetime time_current; int init(){ if(isFirst) { isFirst = false; time_current=TimeCurrent(); }
Remember, that static and common (globally declared) variables are only reset on EA recompile (or you reseting the extern or you removing and re-adding the EA.)
When you change pairs or time frames the EA will go through a deinit() / init() cycle but the variables will not be reset.
Your isFirst only indicates if this is the first time init() has been called or not.
In B: the parameters/inputs isFirst and time_current can be set by the user in the Inputs tab of the EA/Indicator/Script in the case of A: the values can not be set by the user.
extern
Just now I have test the difference between A and B according to your points.
What you said is correct but not all, because I find that as below:
1. A has match my purpose very well, but B can't. when B has been attached to chart(suppose: extern datetime time_current=2013.11.14 0:00 in B), if I go to other pair or other time frame chart, "time_current" will be 2013.11.14 0:00 again. so i think there must be other difference between A and B.
2. So I think "extern" has only one effect which can allow us assign its variables before EA's attached.
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1. a question about adding text on "K" line chart by text tool--"A" on MT4
when I add the text--"Words on Test" on "M15" line chart as below:
then I change to "H1" line chart, and I get the below image:
in the fact, I add "Word on Test" on "M15" line chart and just want these words showed on "M15" line chart rather than any other line chart.
My question is : how shall I do for this?
2. a question about time counting
for example, I want to send an order after 10 minutes by an EA which I have set it well for this.
Now I am reviewing "M15" line chart and execute above EA, then 10 minutes later, the order can be sent; that is ok.
But if 5 minutes later, I go to "H1" line chart, then the time is counted from 0 rather than 5, so the order should be sent after 15 minutes from the very beginning rather than 10 minutes, even if I set the variable of counting time as " extern" variable outside of function--start().I want to the order should be sent after 10 minutes, whatever I go to any line chart within the 10 minutes.
My question is : how shall I do for this?