Hello,
Unfortunately, your library is incomplete and bugged. I am trying to use your library with this mql4 indicator http://codebase.mql4.com/7472. I follow your instructions and I get 47 errors and 14 warnings.
'JJN-Fibo_with_compat_library.mq5' JJN-Fibo_with_compat_library.mq5 1 1
'mql4compat.mqh' mql4compat.mqh 1 1
'i' - undeclared identifier JJN-Fibo_with_compat_library.mq5 150 8
'ObjectDelete' - wrong parameters count JJN-Fibo_with_compat_library.mq5 175 4
'ObjectDelete' - wrong parameters count JJN-Fibo_with_compat_library.mq5 176 4
'ObjectDelete' - wrong parameters count JJN-Fibo_with_compat_library.mq5 177 4
'ObjectDelete' - wrong parameters count JJN-Fibo_with_compat_library.mq5 178 4
'ObjectDelete' - wrong parameters count JJN-Fibo_with_compat_library.mq5 179 4
'ObjectDelete' - wrong parameters count JJN-Fibo_with_compat_library.mq5 180 4
'ObjectDelete' - wrong parameters count JJN-Fibo_with_compat_library.mq5 181 4
'DisplayDec' - undeclared identifier JJN-Fibo_with_compat_library.mq5 190 4
'ObjectCreate' - wrong parameters count JJN-Fibo_with_compat_library.mq5 196 4
'DisplayDec' - undeclared identifier JJN-Fibo_with_compat_library.mq5 197 100
'StringConcatenate' - wrong parameters count JJN-Fibo_with_compat_library.mq5 197 30
implicit conversion from 'number' to 'string' JJN-Fibo_with_compat_library.mq5 197 30
'ObjectCreate' - wrong parameters count JJN-Fibo_with_compat_library.mq5 198 4
'StringConcatenate' - wrong parameters count JJN-Fibo_with_compat_library.mq5 199 30
implicit conversion from 'number' to 'string' JJN-Fibo_with_compat_library.mq5 199 30
'ObjectCreate' - wrong parameters count JJN-Fibo_with_compat_library.mq5 200 4
'StringConcatenate' - wrong parameters count JJN-Fibo_with_compat_library.mq5 201 30
implicit conversion from 'number' to 'string' JJN-Fibo_with_compat_library.mq5 201 30
'ObjectCreate' - wrong parameters count JJN-Fibo_with_compat_library.mq5 202 4
'StringConcatenate' - wrong parameters count JJN-Fibo_with_compat_library.mq5 203 30
implicit conversion from 'number' to 'string' JJN-Fibo_with_compat_library.mq5 203 30
'ObjectCreate' - wrong parameters count JJN-Fibo_with_compat_library.mq5 204 4
'StringConcatenate' - wrong parameters count JJN-Fibo_with_compat_library.mq5 205 30
implicit conversion from 'number' to 'string' JJN-Fibo_with_compat_library.mq5 205 30
'ObjectCreate' - wrong parameters count JJN-Fibo_with_compat_library.mq5 206 4
'StringConcatenate' - wrong parameters count JJN-Fibo_with_compat_library.mq5 207 30
implicit conversion from 'number' to 'string' JJN-Fibo_with_compat_library.mq5 207 30
'ObjectCreate' - wrong parameters count JJN-Fibo_with_compat_library.mq5 208 4
'StringConcatenate' - wrong parameters count JJN-Fibo_with_compat_library.mq5 209 30
implicit conversion from 'number' to 'string' JJN-Fibo_with_compat_library.mq5 209 30
'ObjectCreate' - wrong parameters count JJN-Fibo_with_compat_library.mq5 214 4
'DisplayDec' - undeclared identifier JJN-Fibo_with_compat_library.mq5 215 104
'StringConcatenate' - wrong parameters count JJN-Fibo_with_compat_library.mq5 215 30
implicit conversion from 'number' to 'string' JJN-Fibo_with_compat_library.mq5 215 30
'ObjectCreate' - wrong parameters count JJN-Fibo_with_compat_library.mq5 216 4
'StringConcatenate' - wrong parameters count JJN-Fibo_with_compat_library.mq5 217 30
implicit conversion from 'number' to 'string' JJN-Fibo_with_compat_library.mq5 217 30
'ObjectCreate' - wrong parameters count JJN-Fibo_with_compat_library.mq5 218 4
'StringConcatenate' - wrong parameters count JJN-Fibo_with_compat_library.mq5 219 30
implicit conversion from 'number' to 'string' JJN-Fibo_with_compat_library.mq5 219 30
'ObjectCreate' - wrong parameters count JJN-Fibo_with_compat_library.mq5 220 4
'StringConcatenate' - wrong parameters count JJN-Fibo_with_compat_library.mq5 221 30
implicit conversion from 'number' to 'string' JJN-Fibo_with_compat_library.mq5 221 30
'ObjectCreate' - wrong parameters count JJN-Fibo_with_compat_library.mq5 222 4
'StringConcatenate' - wrong parameters count JJN-Fibo_with_compat_library.mq5 223 30
implicit conversion from 'number' to 'string' JJN-Fibo_with_compat_library.mq5 223 30
'ObjectCreate' - wrong parameters count JJN-Fibo_with_compat_library.mq5 224 4
'StringConcatenate' - wrong parameters count JJN-Fibo_with_compat_library.mq5 225 30
implicit conversion from 'number' to 'string' JJN-Fibo_with_compat_library.mq5 225 30
'ObjectCreate' - wrong parameters count JJN-Fibo_with_compat_library.mq5 226 4
'StringConcatenate' - wrong parameters count JJN-Fibo_with_compat_library.mq5 227 30
implicit conversion from 'number' to 'string' JJN-Fibo_with_compat_library.mq5 227 30
'ObjectDelete' - wrong parameters count JJN-Fibo_with_compat_library.mq5 99 4
'ObjectDelete' - wrong parameters count JJN-Fibo_with_compat_library.mq5 100 4
'ObjectDelete' - wrong parameters count JJN-Fibo_with_compat_library.mq5 101 4
'ObjectDelete' - wrong parameters count JJN-Fibo_with_compat_library.mq5 102 4
'ObjectDelete' - wrong parameters count JJN-Fibo_with_compat_library.mq5 103 4
'ObjectDelete' - wrong parameters count JJN-Fibo_with_compat_library.mq5 104 4
'ObjectDelete' - wrong parameters count JJN-Fibo_with_compat_library.mq5 105 4
'return' - 'void' function returns a value JJN-Fibo_with_compat_library.mq5 110 4
47 error(s), 14 warning(s) 48 15
Hello,
Unfortunately, your library is incomplete and bugged. I am trying to use your library with this mql4 indicator http://codebase.mql4.com/7472. I follow your instructions and I get 47 errors and 14 warnings.
ALso I did test that indicator on MT4, seems it did not work properly there too.
P.S> I did some minor update and tweaks for compatibility library so you might grab latest version 1.1 as soon as it will be approved. In v1.0 the string StringConcatenate() function would not work properly as it conflicts between MQL4 and MQL5 in way how it works - added StringConcatenateMQL4 in v1.1The function names which are giving errors need to be adjusted by adding MQL4 in the end of their names so compilation errors will go away.
ALso I did test that indicator on MT4, seems it did not work properly there too.
P.S> I did some minor update and tweaks for compatibility library so you might grab latest version 1.1 as soon as it will be approved. In v1.0 the string StringConcatenate() function would not work properly as it conflicts between MQL4 and MQL5 in way how it works - added StringConcatenateMQL4 in v1.1Thanks for your reply. I will check when your version 1.1 will be available.
- If a lot a function name need to be adjusted, it's no more a compatibility library, it would be better to adjust your library to suppress the 'MQL4' suffix. I know it's not possible for all function (StringConcatenate for example).
- I suggest you to check this kind of code, as WHOLE_ARRAY is not intended to work with Copyxxxx function, and the result of this function is probably not what you wish.
void __Open(double &_Open[]) { ArraySetAsSeries(_Open,true); CopyOpen(_Symbol,_Period,0,WHOLE_ARRAY,_Open); // What is the returned value ? }
This library seems unmaintened in 2021. I tried contacting the author by sending him messages through MQL5, but no answer. I connected continiously to the mentionned IRC chan for more than a month, but I was alone this whole time...
So I created a github version which fixes warning / errors when compiling with MQL5 version build 2981 as well as a very rough library which allows to run back a converted script / EA on MQL4.
So get the latest version here : https://github.com/eromawyn/mql4compat
And don’t hesitate to send me your patches if you did something interesting !

- github.com

- Free trading apps
- Over 8,000 signals for copying
- Economic news for exploring financial markets
You agree to website policy and terms of use
MQL4 to MQL5 compatibility library:
Author: T-1000