binary file: how to Read and Write

[fx.practic]

Josh or any advanced c# programmer please help!

Please. show example how to read from binary file (how open, read and close binary file correct).

Exactly how to read in array.

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I didn't find complete examples on forum, and examples from MSDN didn't work

[NinjaTrader_Bertrand]

fx.practic, please check into the refererance samples we have published here - http://www.ninjatrader-support2.com/...splay.php?f=30

There're entries for using System.IO File and StreamReader / Writer to reading / writing from files.

[fx.practic]

Here http://www.ninjatrader-support2.com/...splay.php?f=30 there are 3 three threads about files I/O:

1. Indicator: Using System.IO File properties to write to and read from a text file (http://www.ninjatrader-support2.com/...ead.php?t=3477)

2. Indicator: Using StreamReader to read from a text file (http://www.ninjatrader-support2.com/...ead.php?t=3476

3. Indicator: Using StreamWriter to write to a text file (http://www.ninjatrader-support2.com/...ead.php?t=3475

This samples illustrate how to use text files only.

To everybody who will interesting in binary files I propose my empirisch experience.
If advanced programmers can correct my example - you are welcome.


using System.IO;
...........................

string FILE_NAME = "C:\\Users\\Andrei\\Documents\\NinjaTrader 6.5\\files\\DigitFilter\\DigitFilter_0.bin";

if(System.IO.File.Exists(FILE_NAME))
{
Log("Strategy DF_v01__Original: OK, file" + FILE_NAME +" is open", LogLevel.Information);
FileStream fs = new FileStream(FILE_NAME, FileMode.Open, FileAccess.Read);
BinaryReader r = new BinaryReader(fs);
try
{
int i = 0;
while (true) {a_B_DiFi[0, i] = Math.Round(r.ReadDouble(), 8); i++; }
}
catch (Exception e) { r.Close(); fs.Dispose(); fs = null;}
}
else Log("Strategy DF_v01__Original: file "+FILE_NAME+" don't exist", LogLevel.Error);

[marticora]

Hallo, I tried to read and write from a file using the example in (http://www.ninjatrader-support2.com/...ead.php?t=3477)

but if I copy and paste that code in my strategy, not using it as an indicator, I cannot read/write a file.
Could anybody help me on this?
Thanks in advance

[NinjaTrader_Bertrand]

marticora, welcome to our forums - any errors in the log tab if you run your modified stratregy then? Since the link you posted was broken, which sample did you use here?

[marticora]

Hallo Bertrand,
I found the following indicator that works fine to read/write:

http://www.ninjatrader-support2.com/vb/showthread.php?t=3477

I am very new to C# programming, so this is very likely a beginner mistake... but I am learning.
I am trying to get the same above to run within a strategy file I am developping, but this does not work: in fact the file is not created and nothig happens.
Attached you find what I did.
Thank you

[NinjaTrader_Bertrand]

It might not find your path, please try exact as per our sample -

 
private string path = [B]Cbi.Core.UserDataDir.ToString()[/B] + "SampleFileReadWrite-MyTestFile.txt";

[marticora]

It works!
Thank you very much!