open, read, write file binary ?

[dongtrien]

I want to search example simple file binary read,write... in the form record, can i help you ? thanks

[WoF]

What do you mean "in the form record"?
Binary access is like

Open FileName for Binary As #FNum
Get #FNum, ChunkSize, BufferVar
'or
Put #FNum, BufferVar 'if writing.
Close #FNum

You can Get any number of bytes.
If you leave away the ChunkSize, the amount of bytes read depends on the data type of the BufferVar-variable you are using. If you specify the ChunkSize, the BufferVar must be able to hold the resulting data.

[dongtrien]

The mean is my many records and one record have got fields:

Fullname
Address
PhoneNumber

and i want to write records into file FileReord.dat, what do you understand ?

[WoF]

I think you are referring to random access mode
Open FileName For Random As #FNum Len=RecordLen
You need to know the length of your record, then you can use the Get statement to read records from the file. You have to provide a buffer for one record like that:
Dim RecBuf As String
RecBuf = Space$(RecordLen)
Then you use Get:
Get #Fnum, RecordNumber, RecBuf
If you omit RecordNumber, always the next record is read with consecutive Get statements.
After you have read one record you have to know the field lengths of your data fields to separte them from the record buffer.

I think it is also possible to declare the record as a UDT and read consecutive records in that UDT which is already divided in the field sections

Private Type MyRecordType
  FullName As String * 25
  Address As String *40
  PhoneNumber as String * 20
End Type

Private CurRecord as MyRecordType

and in a sub you could read all records like
...

Dim CurRecord As MyRecordType
Open FileName For Random As #1 Len = Len(CurRecord)
  While Not EOF(1)
    Get #1, , CurRecord
    Print "Name: "; CurRecord.FullName
    Print "Address: "; CurRecord.Address
    Print "Phone: "; CurRecord.PhoneNumber
  Wend
Close #1

Instead of printing you might wish to do something useful with the record's data.
Note that I only used made-up field lengths in the UDT. 24, 40 and 20 might not be the lengths of your data fields.
You need to know the field lengths of your record fields and use them in the definition of the Record type instead.

[WoF]

I forgot: To write records you need the same declaration of the record type.

  Dim Rec As MyRecordType
  Open FileName For Random As #1 Len = Len(CurRecord)
  Rec.Name = "wahwah"
  Rec.Address = "Somewhere"
  Rec.PhoneNumber = "1234"
  Put #1, , Rec
  Close #1

This would write a new record to the file. After Open, it would start writing at the first record.
Put allows you always to specify the recordnumber, so as you can overwrite any record even in the middle of a file.
And there is the Seek statement to put your current record pointer to a specific record.