Question

Open Binary File Created in C++

Asked by: GerryLemay

I'm trying to open a file in VB that was created by the following code in C++.  

for( cnt = 0 ; cnt < 16 ; cnt++ )
      {
            Data_Double[int(FILTER_ID_OFFSET) + cnt] = DATA[cnt + 1 ];
      }


      
      if( (fp_file = fopen(FILE_NAME, "wb" )) != NULL )
      {
        fwrite (Data_Double , sizeof(double ) , 640, fp_file );
            fclose(fp_file );

I'm using variations of the following code as a test and can't seem to make it work:

Public Function CreateMemoryFile()
Dim TempArray As Variant, Nxt As Integer  'NewData As MemFile,
Open App.Path & "\Memory\PRE_MEM_1.flt" For Binary As #1
    Get #1, , TempArray
Close #1

MsgBox TempArray(0)
End Function

Any suggestions?

Gerry

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Asked On
2007-06-12 at 19:31:31ID22630182
Tags

binary

,

file

,

open

Topics

C++ Programming Language

,

Visual Basic Programming

Participating Experts
2
Points
250
Comments
5

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Answers

 

by: vinnyd79Posted on 2007-06-12 at 19:53:35ID: 19271571

are you just looking to read the whole file? You could try:

Public Function CreateMemoryFile()
Dim FileData As String

Open App.Path & "\PRE_MEM_1.flt" For Binary As #1
    FileData = Space$(LOF(1))
    Get #1, , FileData
Close #1

Debug.Print FileData
End Function

 

by: GerryLemayPosted on 2007-06-12 at 20:03:19ID: 19271599

Actually the file is an array of unique data elemets stored as doubles.  I need to read each element of the array and process them.  I then need to create the same file with the new data.  I forgot to add that.  I'm reading the file but when I check individual array elements I get a type mismatch when I try to read any of the elements  If I change the type to double I end up with a subscript out of range error.  

Thanks
Gerry

 

by: danaseamanPosted on 2007-06-12 at 20:22:03ID: 19271728

'Try this:

Option Explicit

Private Sub Form_Load()
   Dim i                As Long
   Dim lCount           As Long
   Dim dblArray()       As Double
   Dim FF               As Integer
   Dim sValues          As String
   
   FF = FreeFile
   Open App.Path & "\Memory\PRE_MEM_1.flt" For Binary As #FF
   lCount = LOF(FF) \ 8
   ReDim dblArray(lCount - 1)
   For i = 0 To lCount - 1
      Get #FF, , dblArray(i)
   Next
   Close #FF

   For i = 0 To UBound(dblArray)
      sValues = sValues & dblArray(i) & vbCrLf
   Next
   MsgBox sValues
End Sub

 

by: danaseamanPosted on 2007-06-12 at 20:27:49ID: 19271752

'To create new file:

   'Modify dblArray Values ...
   'Write new file with updated calues
   FF = FreeFile
   Open App.Path & "\Memory\PRE_MEM_1.flt" For Binary As #FF
   For i = 0 To UBound(dblArray)
      Put #FF, , dblArray(i)
   Next
   Close #FF

 

by: GerryLemayPosted on 2007-06-13 at 05:49:30ID: 19273978

That's it!  It worked perfectly.

Thanks so much!!!

Gerry

20120131-EE-VQP-002

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