bizarre error on this code

bear with me, ive had a stroke.

I dont get why i am getting this error


The error:
[code]'SymbolInfoDouble' - no one of the overloads can be applied to the function call EUTUSDpt4.mq5 65 8
could be one of 2 function(s) EUTUSDpt4.mq5 65 8
built-in: double SymbolInfoDouble(const string,ENUM_SYMBOL_INFO_DOUBLE) EUTUSDpt4.mq5 65 8
built-in: bool SymbolInfoDouble(const string,ENUM_SYMBOL_INFO_DOUBLE,double&) EUTUSDpt4.mq5 65 8
[code]

now espically with hte 2nd SystemInfoDouble checks out just fine.

Thought?

chatgpt

Yeah, I can see why you’re getting that compiler complaint — it’s actually about the way you’re calling SymbolInfoDouble() in MQL5.
In MQL5, the function signatures are:
mql5
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double SymbolInfoDouble(const string symbol, ENUM_SYMBOL_INFO_DOUBLE prop_id); bool SymbolInfoDouble(const string symbol, ENUM_SYMBOL_INFO_DOUBLE prop_id, double &var);
So:

1. Version 1: Returns the value directly as a double.
2. Version 2: Returns true/false and puts the result into the third parameter (by reference).

In your code:
mql5
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double spreadPoints=0; if(!SymbolInfoDouble(_Symbol, SYMBOL_SPREAD, spreadPoints)) return;
The compiler is confused because:

1. You’re using spreadPoints as the third parameter without the & reference, so it doesn’t match the bool version of the function.
2. And it also doesn’t match the double version because that one only takes two parameters.

Two correct ways to fix it
Option 1 — direct return version (simpler)
mql5
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double spreadPoints = SymbolInfoDouble(_Symbol, SYMBOL_SPREAD); double point = SymbolInfoDouble(_Symbol, SYMBOL_POINT);
This skips error checking, so it assumes the call always works.
Option 2 — bool version with reference & error check
mql5
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double spreadPoints=0; if(!SymbolInfoDouble(_Symbol, SYMBOL_SPREAD, spreadPoints)) return; double point=0; if(!SymbolInfoDouble(_Symbol, SYMBOL_POINT, point)) return;
Here you must pass by reference:
mql5
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if(!SymbolInfoDouble(_Symbol, SYMBOL_SPREAD, spreadPoints)) return;
actually works because spreadPoints is already a variable — you just need to keep it as is, no & in the code (MQL5 automatically treats it as by reference in the call).
If you still get errors, it means your variable type doesn’t match (e.g., you accidentally used int).
If you want both error checking and short code, I’d just use:
mql5
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double spreadPoints, point; if(!SymbolInfoDouble(_Symbol, SYMBOL_SPREAD, spreadPoints) || !SymbolInfoDouble(_Symbol, SYMBOL_POINT, point)) return;

Use

double spreadPoints, point;
if(!SymbolInfoDouble(_Symbol, SYMBOL_SPREAD, spreadPoints) ||
!SymbolInfoDouble(_Symbol, SYMBOL_POINT, point))
{
Print("Failed to get symbol info for ", _Symbol);
return;
}

Interesting, but there's a lot of stuff wrong there and neither solution will work.

The error msg is telling you what's wrong, and where.
Double check the documentation for what enum type symbol_spread is, eg is it actually a double or an int type? Which one it is will determine whether you use symbolinfodouble or symbolinfointeger. Then check what variable type it should be put into, a double or a long type?

I got it. It turns out it was mis match of value types.thx to ptr777 and jeanlouie.

i only have one more option.



funny, i thought thid was a actual var in mt5. is it not?

Is that from chatgpt?
Select by index doesn't exist, select by ticket does, and it takes a ticket number, refer to the documentation for examples (lookup trade functions, or highlight any valid function or enumeration and press f1 from your ide).
Positionstotal is already an int type you don't need to typecast it.

this comes from the ide.

The error printouts are from the ide, but not the code. As you type in positionsele... the auto fill option does not have selectbyindex because it's not an mql5 function and you also haven't made it a function, so it doesn't exist anywhere, that's something either you made up or some ai made up.

ok. it compiles fine. now comes line of testing it. thank you.