MetaTrader 4 Build 600 with Updated MQL4 Language and Market of Applications Released - page 61

[Alain Verleyen]

As a reminder :

Build 613/614 are not official release but beta release only available through Metaquotes-Demo or Test servers.

It can happen that your terminal connected to other brokers are also updated if you have one terminal connected to one of the Metaquotes servers.

[[Deleted]]

@ angevoyageur, where can i review the update history of the mt4?

[Alain Verleyen]

investor89:
@ angevoyageur, where can i review the update history of the mt4?

In your log files. File Menu, Open Data Folder, then logs subfolder.

[darksamu]

I think I've found a bug in builds 613 and 614.

If you open a file for writing, fill it up with data, then go back to beginning of the file and change e.g. the first 4 bytes, all the other contents of the file will be deleted. In builds 610 (and older) only the 4 bytes were changed and the other parts of the file wouldn't be touched.

Here is an example code:

//+------------------------------------------------------------------+
//|                                                       FLtest.mq4 |
//|                        Copyright 2014, MetaQuotes Software Corp. |
//|                                              https://www.mql5.com |
//+------------------------------------------------------------------+
#property copyright "Copyright 2014, MetaQuotes Software Corp."
#property link      "https://www.mql5.com"
#property version   "1.00"
#property strict
#property indicator_chart_window
//+------------------------------------------------------------------+
//| Custom indicator initialization function                         |
//+------------------------------------------------------------------+
int OnInit()
{
   return(INIT_SUCCEEDED);
}
//+------------------------------------------------------------------+
//| Custom indicator iteration function                              |
//+------------------------------------------------------------------+
int OnCalculate(const int rates_total,
                const int prev_calculated,
                const datetime &time[],
                const double &open[],
                const double &high[],
                const double &low[],
                const double &close[],
                const long &tick_volume[],
                const long &volume[],
                const int &spread[])
{

   int i, change, flhandle;



   flhandle=FileOpen("test.bin", FILE_BIN|FILE_WRITE);
   if (flhandle>0)
     {
        for(i=0; i<100; i++)
          {
             FileWriteDouble (flhandle, i, 4);
          }

        FileSeek(flhandle, 0, SEEK_SET);                        // goes to beginning of file
        change=45;
        FileWriteDouble(flhandle, change, 4);                   // writes 4 bytes to the beginning of file

        FileClose(flhandle);
     }



   return(rates_total);
}

The code above gives a 400 byte file in build 610, however in build 613 and 614 test.bin will be only 4 bytes in size.

[Simon Gniadkowski]

darksamu:

I think I've found a bug in builds 613 and 614.

If you open a file for writing, fill it up with data, then go back to beginning of the file and change e.g. the first 4 bytes, all the other contents of the file will be deleted. In builds 610 (and older) only the 4 bytes were changed and the other parts of the file wouldn't be touched.

Here is an example code:

The code above gives a 400 byte file in build 610, however in build 613 and 614 test.bin will be only 4 bytes in size.

How can you FileSeek() without opening the file for reading ? try adding FILE_READ to your flags.

This might help also: https://www.mql5.com/en/forum/108526

[Alain Verleyen]

RaptorUK:
How can you FileSeek() without opening the file for reading ? try adding FILE_READ to your flags.

This might help also: https://www.mql5.com/en/forum/108526

FileSeek has nothing to do with read/write.

darksamu:

I think I've found a bug in builds 613 and 614.

If you open a file for writing, fill it up with data, then go back to beginning of the file and change e.g. the first 4 bytes, all the other contents of the file will be deleted. In builds 610 (and older) only the 4 bytes were changed and the other parts of the file wouldn't be touched.

Here is an example code:

The code above gives a 400 byte file in build 610, however in build 613 and 614 test.bin will be only 4 bytes in size.

It's a bug. Can you please report it to ServiceDesk of Metaquotes (you have to register at mql5.com) ?

[darksamu]

angevoyageur:
FileSeek has nothing to do with read/write.It's a bug. Can you please report it to ServiceDesk of Metaquotes (you have to register at mql5.com) ?

Ok, I submitted the bug to Service Desk.

[Alain Verleyen]

darksamu:

Ok, I submitted the bug to Service Desk.

Thank you.

[mt_nix]

Where can I download the latest mt4 build?

[darksamu]

ArturZ:
Where can I download the latest mt4 build?

Connect to demo.metaquotes.net:444 from your MT4 and it will update itself automatically.