MetaTrader 4 Build 574 with Updated MQL4 Language and Market of Applications Released - page 2

[Simon Gniadkowski]

Renat:

Press F1 and you will see mql4.chm file.

New version of online MQL4 documentation will be published after release.

I was asking about a beta version not the release version. Online not in application . . . but taking the chm help, start(), init() and deinit() are not documented, they are not listed as Obsolete so should still be documented.

[Simon Gniadkowski]

Is anything going to be done with the Object vs Object terminology ? isn't this a recipe to cause confusion ? how do I delete an object ?

Creating and Deleting Objects

After a mql4 program is loaded for execution, memory is allocated to each variable according to its type. According to the access level all variables are divided into two types - global variables and local variables. According to the memory class they can be input parameters of a mql4 program, static and automatic. If necessary, each variable is initialized by a corresponding value. After being used a variable is unintialized and memory used by it is returned to the MQL4 executable system.

or

ObjectDelete() ?

ObjectDelete

The function removes the object with the specified name at the specified chart. There are two variants of the function:

By the way, unintialized is spelt incorrectly, there is a missing i uninitialized

[Simon Gniadkowski]

Is the format of the .hst files changing ? I assume it is, if not where is spread and volume going to come from for OnCalculate, if it is how will existing compiled .ex4s that write offline charts work ? will they still work as intended ?

[Renat Fatkhullin]

RaptorUK:
Is the format of the .hst files changing ? I assume it is, if not where is spread and volume going to come from for OnCalculate, if it is how will existing compiled .ex4s that write offline charts work ? will they still work as intended ?

Changed.

Check the new version of PeriodConverter.mq4 from build 574.

[Simon Gniadkowski]

Renat:

Changed.

So this means that existing compiled ex4s that read and write .hst files will probably no longer function as intended ? I thought there was a promise that existing .ex4s would still work ? or perhaps I am misunderstanding the situation ?

Will there be spread and real_volume predefined variables so this can be read from start() or OnTick(), etc. or is the only option CopySpread() and CopyRealVolume() ? spread and real_volume predefined variables are not currently included in the chm help file.

[Renat Fatkhullin]

HST format is not documented and only for our service.

[Simon Gniadkowski]

Renat:
HST format is not documented and only for our service.

So what is the function of FileOpenHistory() if not to access .hst files, both reading and writing ?

[Ubzen]

Renat: Press F1 to see mql4.chm file. New version of online MQL4 documentation will be published after release.

Thanks. Pressing F1 within Meta-Editor gives me the User Guide. Following the Menu. Help->MQL4 Reference brings up the Mql4 stuff.

[Ubzen]

If you guys are still interested in bugs and suggestions, I found one today.

https://www.mql5.com/en/forum/148814.

My simple script below generates a Class location of the Memory-Leak within mt5 but not within mt4.

void OnStart(){
    CLeak* MemoryLeak = new CLeak;
    MemoryLeak.SetDummyValueTrue();
}

class CLeak{
    private:
        bool DummyValue;
    public:
        CLeak(){}; //Constructor
        ~CLeak(){}; //Destructor
        void SetDummyValueTrue();
};


void CLeak::SetDummyValueTrue(){
    DummyValue=true;
}

[Alexey Da]

Try to add following line at the end of OnStart function.

delete MemoryLeak;