Need help on csv

Can some programmer please help me with csv.
H= FileOpen("D.csv",FILE_READ | FILE_WRITE,';');
opened the file and
write it
FileWrite(H,Open[0]);
with double H declared
but
double C;
if(H>0)
{
C=FileReadNumber(H);
FileClose(H);
}
does not read anything.
Error 4051.
Also, how to make that it write to second column instead of placing delimiter ';'?
Thanks in advance.

I understand that the question is hard. It is one of the hardest points in the programming and not all programmers know the solution.
Is there on this forum some programmer who knows the answer?
Looks like nobody knows.

Nobody knows based on the pathetic information you have posted. Instead of just guessing at snippets of code that do not paint the whole picture of what your error laden program is doing why not post the entire file so someone can dig through it and clean up the mess you left behind?

Magnumfreak,
thanks for the reply.
I know you are an expert in programming. I saw your posts.
Here you go:
double H;
H= FileOpen("D.csv",FILE_READ | FILE_WRITE,';');
if(H>0)
{
FileWrite(H,Open[0]);//, Close[0]);// delimiter ';' is inserted
FileClose(H);
}
double C;
if(H>0)
{
C=FileReadNumber(H);
FileClose(H);
}
//Comment(C);
Comment(GetLastError());
return(0);
}
it cannot read the number and also it sets ';' instead of writing to the next column

What is the data type of file handles? Highlight FileOpen and hit F1.

Probably because you close the file after you write the data to it but you never re open the file prior to trying to read from it.

Magnumfreak,

it works!!! thank you.
may i ask you also how to write to
the next column because
it inserts delimiter within the same column.
I tried and it did not
work.
Please help.
Thank you.

FileSeek(handle, 0, SEEK_END);

Just tell it to move to the end of the file with the FileSeek command.

I did try but i could not make it.
But did it by other way and it works also.
But thanks for your time.
May i please ask you next help?
H= FileOpen("DD.csv",FILE_CSV, ';');
double C;
if(H>0)
{
C=FileReadNumber(H);//let me think
FileClose(H);
}
Comment(C);
1) how to read the number which is in 2nd line of the 2nd row
2) is it possible to get Open[0] to the file
from the second broker?
Thank you very much.

Since Magnumfreak is probably busy, can somebody please help.
Thank you.

Can somebody please help?
H= FileOpen("DD.csv",FILE_CSV, ';');
double C;
if(H>0)
{
C=FileReadNumber(H);//let me think
FileClose(H);
}
Comment(C);
1) how to read the number which is in 2nd line of the 2nd row
2) is it possible to get Open[0] to the file
from the second broker?
Thank you very much.

Nobody wants to help.
That is OK with me.
Is on this forum at least one good person that
can give me an information on how to work with csv files?
I believe there is no programmer who knows everything.
Some bug can take days to find it. Is it so difficult to help?
Why is this programming discussion section?
Is it just to give a vague answers to show that I am an expert and
that all see and get more clients? What about having good will?
This thread is over for me.

1.) Every built-in function is documented in the mql4 reference. Read the documentation for FileReadNumber(). This function will read from the current position to the next delimiter.

1a) So logically if you have two numbers on one line you have to call it two times per line.

1b) If you want to read a line other than the first one, you have to first read all other lines before that line, because there is no way of guessing where exactly you should put the filepointer for a given line, because they dont have fixed size.

2) the filetype of file handles is int, not double. Again you could have found this in the documentation for the FileOpen() function.

3) if you want to learn programming then don't start with mql4. This won't work! If you don't want to learn programming then immediately stop mesing around with mql4!

If you want to learn programming (you must really want it), there are lots of resources on the web and beginner friendly programming languages. I suggest you make the first steps by learning Python. After you mastered the first steps and feel more or less secure in the very basics of programming (variables, functions, classes, objects) you may be interested in learning a statically typed language, this will again give you some challenges to master and additionaly a new syntax to learn, but already learned concepts remain valid, i suggest using ObjectPascal because it unforgivingly enforces type safety, something you must be familiar with when dealing with C like languages that have a static but very weak type system.

These two languages are good candidates for two important extremes you must have seen and worked with before proceding to error prone and difficult to debug languages like C, C++ and their crippled child MQL. Both languages are easy to get started with, free to download and use and beginner friendly. They are also both heavily used in productive environments, so you dont learn something theoretical only.