Hello MQL community,
I am trying to adjust the script PeriodConverter that is included in MT4 samples, to use multiple timeframe periods in one conversion script.
The modified script works partially, but the modified part isn't updating on chart as original does.
With this script can be generated and used as regular charts, (even they are opened with File -> Open Offline), any custom periods of existing charts, M2, M3, H2, H5... even strange periods like M7 , M11 or H9.
I attach code (see SRC below) , I think it can be usefull for other users if can be made to work with multiple periods output, maybe 4-5 periods in a shot (first, let's make it work with 2 periods).
I found very interesting that when opening offline chart generated by original script, can be seen updated prices, add indicators, additional scripts, even activate "Show Ask line".
There is only a delay of about one second in updating chart (initially it was 2 seconds but I changed value of delay to 1).
In the modified part , the calculation is made OK as it seems, but only to history part and doesn't update Ask & Bid lines.
If I open in Offline mode the generated charts, the first chart is updating and works great, but the second isn't.
I'm new in programing MQL, can anyone help to correct this problem, and maybe to eliminate redundant / not necessary parameters that can be used only once in a run, to speed up script execution?
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Please, any ideas ?
For easier view, I attach source code in text. The second period variables that I added have 2 in the endpart of the name.
Waiting for your help please, to tell what is the issue for the second chart doesn't update the same as the original does.
This is the begining part of the modified script, that seems to work OK:
//| PeriodConverter.mq4 |
//| Copyright 2006-2014, MetaQuotes Software Corp. |
//| http://www.metaquotes.net |
#property copyright "2006-2014, MetaQuotes Software Corp."
#property link "https://www.mql4.com"
#property description "Period Converter to updated format of history base"
input int InpPeriodMultiplier=2; // Period multiplier factor 1
input int InpPeriodMultiplier2=3; // Period multiplier factor 2 // ** Supplementary variable added
int ExtHandle2=-1; // ** Supplementary variable handle added
//| script program start function |
ulong last_fpos2=0; // ** Supplementary fileposition added
//---- History header
MqlRates rate, rate2;
c_copyright="(C)opyright 2003, MetaQuotes Software Corp.";
//--- write history file header
//--- write history file header2
//--- write history file
//--- normalize open time
for(i=start_pos-1; i>=0; i--)
//--- history may be updated
//--- modify index if history was updated
if(time0>=rate.time+periodseconds || i==0)
if(i==0 && time0<rate.time+periodseconds)
//--- // Start RATE2:
if(time0>=rate2.time+periodseconds2 || i==0)
if(i==0 && time0<rate2.time+periodseconds2)
// FINAL RATE2
FileFlush(ExtHandle2); // This part works fine
Waiting for any ideas ...
I suppose the problem with refreshing second chart & file comes from the end part of the script, but I don't know exactly where :
Print(cnt," record(s) written // ",cnt2," record2(s) written");
//--- collect incoming ticks
//--- check for new rates
//--- is there current bar?
//--- no, there is new bar
//--- write previous bar remains
//--- no, there is new bar
//--- write previous bar remains
Print("Chart window detected period ", i_period);
Print("Chart window detected period ", i_period2);
//--- refresh window not frequently than 1 time in 1 second
if(hwnd!=0 && hwnd2!=0 && cur_time-last_time>=1)
void OnDeinit(const int reason)
For easier view,
I added supplementary variables ending in 2 , for example InpPeriodMultiplier2 , ExtHandle2 .
The changes were that I made again all the original calculation for another period, all new variables ending with 2.
This is just a prototype, when will be working I will use an array of MQLrates. As soon as will update on all charts the values.
Searching on internet, I found another function that could help (thanks to pips4life & original idea of rangebound) :
// This routine by pips4life is an offshoot of an incomplete (but useful)
// suggestion by rangebound how to solve the problem that WindowHandle()
// only returns the first window it finds.
// GetWindowTextA overwrites gwstr but it should initially be at least as long as it will become.
// //12345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789 //119 chars
gwstr = " ";
hwnd = WindowHandle(symboloutput,NewPeriodDisplayed); //This is non-zero if at least one matching window exists
if (hwnd != 0)
hwnd = GetWindow(hwnd,GW_HWNDFIRST);
while (hwnd !=0)
len = GetWindowTextA(hwnd,gwstr,80);
if ((len > 0) ) // MY MODIFIED !!! initially was : if ((len >0) && gwstr == offlineChartName)
hwnd = GetWindow(hwnd,GW_HWNDNEXT);
} // end of UpdateMultipleChartWindows
I try to intregrate this in script but give error : gwstr : Parameter conversion not allowed
Original script from pips4life is attached. Pips4life also had the problem with only one chart updating, but he solved the problem by this function.
His script seems to be very good, complex but I want to keep the script very simple.
"I try to intregrate this in script but give error : gwstr : Parameter conversion not allowed"
Put a 'W' on the end of the function call