Why [ MetaTrader 4 ] can't write/open a file in windows 10 with the FileWrite() function? - mql4

Question

I tried implementing the solutions from this post
Cannot open file on Ubuntu
But to no avail. I keep getting a 5002 error. (failed to open file) after FileWrite()
Even when I try out the example script on https://docs.mql4.com/files/filewrite
I get the same error. I tried running MetaTrader Terminal 4 in administrator mode but to no avail either.Does anyone know a solution to this?
#property version "1.00"
#property strict
//--- show the window of input parameters when launching the script
#property script_show_inputs
//--- parameters for receiving data from the terminal
input string InpSymbolName = "EURUSD"; // Сurrency pair
input ENUM_TIMEFRAMES InpSymbolPeriod = PERIOD_H1; // Time frame
input int InpFastEMAPeriod = 12; // Fast EMA period
input int InpSlowEMAPeriod = 26; // Slow EMA period
input int InpSignalPeriod = 9; // Difference averaging period
input ENUM_APPLIED_PRICE InpAppliedPrice = PRICE_CLOSE; // Price type
//--- parameters for writing data to file
input string InpFileName = "MACD.csv"; // File name
input string InpDirectoryName = "Data"; // Folder name
//+------------------------------------------------------------------+
//| Script program start function |
//+------------------------------------------------------------------+
void OnStart()
{
bool sign_buff[]; // signal array (true - buy, false - sell)
datetime time_buff[]; // array of signals' appear time
int sign_size=0; // signal array size
double macd_buff[]; // array of indicator values
datetime date_buff[]; // array of indicator dates
int macd_size=0; // size of indicator arrays
//--- set indexing as time series
ArraySetAsSeries( sign_buff, true );
ArraySetAsSeries( time_buff, true );
ArraySetAsSeries( macd_buff, true );
ArraySetAsSeries( date_buff, true );
//--- reset last error code
ResetLastError();
//--- copying the time from last 1000 bars
int copied = CopyTime( NULL, 0, 0, 1000, date_buff );
if ( copied <= 0 )
{ PrintFormat( "Failed to copy time values. Error code = %d", GetLastError() );`
return;
}
//--- prepare macd_buff array
ArrayResize( macd_buff, copied );
//--- copy the values of main line of the iMACD indicator
for ( int i = 0; i< copied; i++ )
{ macd_buff[i] = iMACD( InpSymbolName, InpSymbolPeriod, InpFastEMAPeriod, InpSlowEMAPeriod, InpSignalPeriod, InpAppliedPrice, MODE_MAIN, i );
}
//--- get size
macd_size = ArraySize( macd_buff );
//--- analyze the data and save the indicator signals to the arrays
ArrayResize( sign_buff, macd_size - 1 );
ArrayResize( time_buff, macd_size - 1 );
for ( int i = 1; i < macd_size; i++ )
{
//--- buy signal
if ( macd_buff[i-1] < 0
&& macd_buff[i] >= 0 )
{
sign_buff[sign_size] = true;
time_buff[sign_size] = date_buff[i];
sign_size++;
}
//--- sell signal
if ( macd_buff[i-1] > 0
&& macd_buff[i] <= 0 )
{
sign_buff[sign_size] = false;
time_buff[sign_size] = date_buff[i];
sign_size++;
}
}
//--- open the file for writing the indicator values (if the file is absent, it will be created automatically)
ResetLastError();
int file_handle = FileOpen( InpDirectoryName // aDirNAME
+ "//" // aFileSystemTreeBranchSEPARATOR
+ InpFileName, // aFileNAME
FILE_READ|FILE_WRITE|FILE_CSV // fileIoMODE_FLAGs
);
if ( file_handle != INVALID_HANDLE )
{
PrintFormat( "%s file is available for writing", InpFileName );
PrintFormat( "File path: %s\\Files\\", TerminalInfoString( TERMINAL_DATA_PATH ) );
//--- first, write the number of signals
FileWrite( file_handle, sign_size );
//--- write the time and values of signals to the file
for ( int i = 0; i < sign_size; i++ )
FileWrite( file_handle, time_buff[i], sign_buff[i] );
//--- close the file
FileClose( file_handle );
PrintFormat( "Data is written, %s file is closed", InpFileName );
}
else
PrintFormat( "Failed to open %s file, Error code = %d", InpFileName, GetLastError() );
}

Answer 1

Alt. A)
the algo does not check for a positive presence of an InpDirectoryName node in the filesystem.
Alt. B)
in case the Alt. A) passes, there ought be used a compatible delimiter in aFilePATH + aFileNAME string, i.e. == "\\", ( aFileSystemTreeBranchSEPARATOR ref.: Help for details )
thena fileIO shall take place in \Terminal\Common\Files ( in case a FILE_COMMON bitmask flag was added (used) in the int open_flags parameter),
otherwise,the operations will take place in a (sub)-directory of a MetaTrader Terminal 4 local folder== MQL4\Files ( for a live ExpertAdvisor or Custom Indicator or Script mode of operations )or== MQL4\Tester\Files ( in case of using ExpertAdvisor or Custom Indicatorinside a back-testing framework of MT4 Strategy Tester).