Hi,
I'm trying to read a database file written from a turbo Pascal program. I've
set a structure to map the records in the file, but
I have problem reading the file when I use VBFixedArray in my structure
instead of VBFixedString.
Here is the original code that works:
Structure CCat
Public code As Short
<VBFixedString( 17)> Public name As String
<VBFixedString( 30*10)> Public myList As String ' in fact, array of
10 strings of 30 chars
End Structure
Dim cat as CCat
Dim value as ValueType = cat
FileGet (1, value)
cat = CType(value, CCat)
The size of the array my change depending on the customer, so I cannot use a
fixed size structure. I've tried to replace it this way:
Structure CCat
Public code As Short
<VBFixedString( 17)> Public name As String
<VBFixedArray(3 0)> Public myList() As String
End Structure
Dim cat as CCat
redim cat.myList(9) ' from what I know, this is supposed to
create an array of 10 strings of 30 chars each.
Dim value as ValueType = cat
FileGet (1, value)
cat = CType(value, CCat)
The fileGet function raises an IOException: Bad record Length.
Can someone tell me what I did wrong ? Also, is there a way to get the
record length I'm requesting before the FileGet ?
Thanks a lot for your help
David 4 8010
The array of strings needs to include the VBFixedString attribute as well as the VBFixedArray attribute. Use the VB Len function to determine the size a structure would be if written using the VB file i/o functions.
Structure CCat
Public code As Short
<VBFixedString( 17)> Public name As String
<VBFixedArray(9 ), VBFixedString(3 0)> Public myList() As String
End Structure
Sub Main()
Dim Size As Integer
Dim cat As CCat
Size = Len(cat)
Stop
End Sub
--
Jim Cantwell, Visual Basic .NET Team
This posting is provided "AS IS" with no warranties, and confers no rights. Use of included script samples are subject to the terms specified at http://www.microsoft.com/info/cpyright.htm
-------------------- From: "David Scemama" <da***********@ wanadoo.fr> Subject: VBFixedArray problem Date: Mon, 20 Oct 2003 12:57:21 +0200 Lines: 45 X-Priority: 3 X-MSMail-Priority: Normal X-Newsreader: Microsoft Outlook Express 6.00.2800.1158 X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2800.1165 Message-ID: <u4************ **@TK2MSFTNGP09 .phx.gbl> Newsgroups: microsoft.publi c.dotnet.langua ges.vb NNTP-Posting-Host: aplessis-bouchard-103-2-1-167.w80-11.abo.wanadoo. fr 80.11.60.167 Path: cpmsftngxa06.ph x.gbl!TK2MSFTNG P08.phx.gbl!TK2 MSFTNGP09.phx.g bl Xref: cpmsftngxa06.ph x.gbl microsoft.publi c.dotnet.langua ges.vb:148341 X-Tomcat-NG: microsoft.publi c.dotnet.langua ges.vb
Hi,
I'm trying to read a database file written from a turbo Pascal program. I've set a structure to map the records in the file, but
I have problem reading the file when I use VBFixedArray in my structure instead of VBFixedString. Here is the original code that works:
Structure CCat Public code As Short <VBFixedString( 17)> Public name As String <VBFixedString( 30*10)> Public myList As String ' in fact, array of 10 strings of 30 chars End Structure
Dim cat as CCat Dim value as ValueType = cat FileGet (1, value) cat = CType(value, CCat)
The size of the array my change depending on the customer, so I cannot use a fixed size structure. I've tried to replace it this way: Structure CCat Public code As Short <VBFixedString( 17)> Public name As String <VBFixedArray(3 0)> Public myList() As String End Structure
Dim cat as CCat redim cat.myList(9) ' from what I know, this is supposed to create an array of 10 strings of 30 chars each. Dim value as ValueType = cat FileGet (1, value) cat = CType(value, CCat)
The fileGet function raises an IOException: Bad record Length.
Can someone tell me what I did wrong ? Also, is there a way to get the record length I'm requesting before the FileGet ?
Thanks a lot for your help David
I've tried what you suggest, but is the ReDim possible on such a structure ?
I need to define the size of the array at runtime !
If I get the size of cat before and after the ReDim, I have the same result
!
Sub Main()
Dim Size As Integer
Dim cat As CCat
Size = Len(cat)
ReDim cat.myList(20)
Size = Len(cat) ' gives the same result !
Stop
End Sub
And a FileGet will raise an exception "Bad Record Length"
David
"Jim Cantwell [MSFT]" <ji****@online. microsoft.com> wrote in message
news:I0******** ******@cpmsftng xa06.phx.gbl... The array of strings needs to include the VBFixedString attribute as well
as the VBFixedArray attribute. Use the VB Len function to determine the
size a structure would be if written using the VB file i/o functions. Structure CCat Public code As Short <VBFixedString( 17)> Public name As String <VBFixedArray(9 ), VBFixedString(3 0)> Public myList() As String End Structure
Sub Main() Dim Size As Integer Dim cat As CCat
Size = Len(cat) Stop End Sub
-- Jim Cantwell, Visual Basic .NET Team This posting is provided "AS IS" with no warranties, and confers no
rights. Use of included script samples are subject to the terms specified at http://www.microsoft.com/info/cpyright.htm --------------------From: "David Scemama" <da***********@ wanadoo.fr> Subject: VBFixedArray problem Date: Mon, 20 Oct 2003 12:57:21 +0200 Lines: 45 X-Priority: 3 X-MSMail-Priority: Normal X-Newsreader: Microsoft Outlook Express 6.00.2800.1158 X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2800.1165 Message-ID: <u4************ **@TK2MSFTNGP09 .phx.gbl> Newsgroups: microsoft.publi c.dotnet.langua ges.vb NNTP-Posting-Host: aplessis-bouchard-103-2-1-167.w80-11.abo.wanadoo. fr
80.11.60.167Path: cpmsftngxa06.ph x.gbl!TK2MSFTNG P08.phx.gbl!TK2 MSFTNGP09.phx.g bl Xref: cpmsftngxa06.ph x.gbl microsoft.publi c.dotnet.langua ges.vb:148341 X-Tomcat-NG: microsoft.publi c.dotnet.langua ges.vb
Hi,
I'm trying to read a database file written from a turbo Pascal program.
I'veset a structure to map the records in the file, but
I have problem reading the file when I use VBFixedArray in my structure instead of VBFixedString. Here is the original code that works:
Structure CCat Public code As Short <VBFixedString( 17)> Public name As String <VBFixedString( 30*10)> Public myList As String ' in fact, array
of10 strings of 30 chars End Structure
Dim cat as CCat Dim value as ValueType = cat FileGet (1, value) cat = CType(value, CCat)
The size of the array my change depending on the customer, so I cannot
use afixed size structure. I've tried to replace it this way: Structure CCat Public code As Short <VBFixedString( 17)> Public name As String <VBFixedArray(3 0)> Public myList() As String End Structure
Dim cat as CCat redim cat.myList(9) ' from what I know, this is supposed
tocreate an array of 10 strings of 30 chars each. Dim value as ValueType = cat FileGet (1, value) cat = CType(value, CCat)
The fileGet function raises an IOException: Bad record Length.
Can someone tell me what I did wrong ? Also, is there a way to get the record length I'm requesting before the FileGet ?
Thanks a lot for your help David
I've had a look in debug mode. The ReDim works perfectly, meaning that I can
see that the size of cat.myList changes after it occurs.
The problem is that the Len function does not report the correct size and
the FileGet does not like the structure length.
Is there any difference between
<VBFixedString( 30*10)> Public myList As String
and
<VBFixedArray(9 ), VBFixedString(3 0)> Public myList() As String
for the FileGet function ? (the first occurence works perfectly)
David
"David Scemama" <da***********@ wanadoo.fr> wrote in message
news:Oe******** ******@TK2MSFTN GP12.phx.gbl... I've tried what you suggest, but is the ReDim possible on such a structure
? I need to define the size of the array at runtime !
If I get the size of cat before and after the ReDim, I have the same
result !
Sub Main() Dim Size As Integer Dim cat As CCat
Size = Len(cat) ReDim cat.myList(20) Size = Len(cat) ' gives the same result !
Stop End Sub
And a FileGet will raise an exception "Bad Record Length"
David
"Jim Cantwell [MSFT]" <ji****@online. microsoft.com> wrote in message news:I0******** ******@cpmsftng xa06.phx.gbl... The array of strings needs to include the VBFixedString attribute as
well as the VBFixedArray attribute. Use the VB Len function to determine the size a structure would be if written using the VB file i/o functions. Structure CCat Public code As Short <VBFixedString( 17)> Public name As String <VBFixedArray(9 ), VBFixedString(3 0)> Public myList() As String End Structure
Sub Main() Dim Size As Integer Dim cat As CCat
Size = Len(cat) Stop End Sub
-- Jim Cantwell, Visual Basic .NET Team This posting is provided "AS IS" with no warranties, and confers no rights. Use of included script samples are subject to the terms specified
at http://www.microsoft.com/info/cpyright.htm --------------------From: "David Scemama" <da***********@ wanadoo.fr> Subject: VBFixedArray problem Date: Mon, 20 Oct 2003 12:57:21 +0200 Lines: 45 X-Priority: 3 X-MSMail-Priority: Normal X-Newsreader: Microsoft Outlook Express 6.00.2800.1158 X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2800.1165 Message-ID: <u4************ **@TK2MSFTNGP09 .phx.gbl> Newsgroups: microsoft.publi c.dotnet.langua ges.vb NNTP-Posting-Host: aplessis-bouchard-103-2-1-167.w80-11.abo.wanadoo. fr 80.11.60.167Path: cpmsftngxa06.ph x.gbl!TK2MSFTNG P08.phx.gbl!TK2 MSFTNGP09.phx.g bl Xref: cpmsftngxa06.ph x.gbl microsoft.publi c.dotnet.langua ges.vb:148341 X-Tomcat-NG: microsoft.publi c.dotnet.langua ges.vb
Hi,
I'm trying to read a database file written from a turbo Pascal program. I'veset a structure to map the records in the file, but
I have problem reading the file when I use VBFixedArray in my structure instead of VBFixedString. Here is the original code that works:
Structure CCat Public code As Short <VBFixedString( 17)> Public name As String <VBFixedString( 30*10)> Public myList As String ' in fact, array of10 strings of 30 chars End Structure
Dim cat as CCat Dim value as ValueType = cat FileGet (1, value) cat = CType(value, CCat)
The size of the array my change depending on the customer, so I cannot use afixed size structure. I've tried to replace it this way: Structure CCat Public code As Short <VBFixedString( 17)> Public name As String <VBFixedArray(3 0)> Public myList() As String End Structure
Dim cat as CCat redim cat.myList(9) ' from what I know, this is
supposed tocreate an array of 10 strings of 30 chars each. Dim value as ValueType = cat FileGet (1, value) cat = CType(value, CCat)
The fileGet function raises an IOException: Bad record Length.
Can someone tell me what I did wrong ? Also, is there a way to get the record length I'm requesting before the FileGet ?
Thanks a lot for your help David
I have confirmed that there is a bug in the FileGet in both VB.NET 7.0 and 7.1. Below is an alternate method of writing the data using non-fixed length arrays.
You can calculate the size required at runtime when using non-fixed arrays, which are written to the file with additional array information for dimensions and dimension length and bounds. The string data will be written out using the string length. If you wish to keep them
at fixed sizes, additional code will be required to validate the member sets and add padding if necessary. But the string length prefix will still be written.
Option Explicit On
Module Module1
Structure CCat
Public code As Short
<VBFixedString( 17)> Public name As String
Public myList As String()
End Structure
Sub Main()
Dim Size As Integer
Dim cat As CCat
Dim filename As String
filename = "c:\foo-workaround2.txt "
cat.code = 1
cat.name = "ABC"
ReDim cat.myList(9)
Dim i As Integer
'put something into the array to test
For i = 0 To 9
cat.myList(i) = StrDup(10, ChrW(AscW("A"c) + i))
Next
'Add the size for our dimensions
Size = 2 'Length of 'code' Short (2)
Size = Size + 17 'Lenght of 'name' Fixed String (17)
'Now calculate and add the size of 'myList'
Size = Size + 2 'Length of Short (for Dimension count)
Size = Size + (cat.myList.Ran k * 8) 'For each dimension, 4 for array Length, 4 for Lower bound
'Now add the size of the string data (30 characters + 2 bytes for length prefix)
Size = Size + cat.myList.Leng th * (30 + 2)
FileOpen(1, filename, OpenMode.Random , OpenAccess.Defa ult, OpenShare.Defau lt, Size)
FilePut(1, cat, 1)
FileClose(1)
Dim cat2 As CCat
FileOpen(1, filename, OpenMode.Random , OpenAccess.Defa ult, OpenShare.Defau lt, Size)
FileGet(1, cat2, 1)
FileClose(1)
Stop
End Sub
End Module
-------------------- From: "David Scemama" <da***********@ wanadoo.fr> References: <u4************ **@TK2MSFTNGP09 .phx.gbl> <I0************ **@cpmsftngxa06 .phx.gbl> <Oe************ **@TK2MSFTNGP12 .phx.gbl> Subject: Re: VBFixedArray problem Date: Tue, 21 Oct 2003 11:49:16 +0200 Lines: 142 X-Priority: 3 X-MSMail-Priority: Normal X-Newsreader: Microsoft Outlook Express 6.00.2800.1158 X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2800.1165 Message-ID: <ON************ *@TK2MSFTNGP11. phx.gbl> Newsgroups: microsoft.publi c.dotnet.langua ges.vb NNTP-Posting-Host: aplessis-bouchard-103-2-1-225.w80-11.abo.wanadoo. fr 80.11.60.225 Path: cpmsftngxa06.ph x.gbl!TK2MSFTNG P08.phx.gbl!TK2 MSFTNGP11.phx.g bl Xref: cpmsftngxa06.ph x.gbl microsoft.publi c.dotnet.langua ges.vb:148599 X-Tomcat-NG: microsoft.publi c.dotnet.langua ges.vb
I've had a look in debug mode. The ReDim works perfectly, meaning that I can see that the size of cat.myList changes after it occurs.
The problem is that the Len function does not report the correct size and the FileGet does not like the structure length.
Is there any difference between <VBFixedString( 30*10)> Public myList As String and <VBFixedArray(9 ), VBFixedString(3 0)> Public myList() As String
for the FileGet function ? (the first occurence works perfectly)
David
"David Scemama" <da***********@ wanadoo.fr> wrote in message news:Oe******* *******@TK2MSFT NGP12.phx.gbl.. . I've tried what you suggest, but is the ReDim possible on such a structure ? I need to define the size of the array at runtime !
If I get the size of cat before and after the ReDim, I have the same result !
Sub Main() Dim Size As Integer Dim cat As CCat
Size = Len(cat) ReDim cat.myList(20) Size = Len(cat) ' gives the same result !
Stop End Sub
And a FileGet will raise an exception "Bad Record Length"
David
"Jim Cantwell [MSFT]" <ji****@online. microsoft.com> wrote in message news:I0******** ******@cpmsftng xa06.phx.gbl... > The array of strings needs to include the VBFixedString attribute as well as the VBFixedArray attribute. Use the VB Len function to determine the size a structure would be if written using the VB file i/o functions. > Structure CCat > Public code As Short > <VBFixedString( 17)> Public name As String > <VBFixedArray(9 ), VBFixedString(3 0)> Public myList() As String > End Structure > > Sub Main() > Dim Size As Integer > Dim cat As CCat > > Size = Len(cat) > Stop > End Sub > > -- > Jim Cantwell, Visual Basic .NET Team > This posting is provided "AS IS" with no warranties, and confers no rights. Use of included script samples are subject to the terms specified at http://www.microsoft.com/info/cpyright.htm > -------------------- > >From: "David Scemama" <da***********@ wanadoo.fr> > >Subject: VBFixedArray problem > >Date: Mon, 20 Oct 2003 12:57:21 +0200 > >Lines: 45 > >X-Priority: 3 > >X-MSMail-Priority: Normal > >X-Newsreader: Microsoft Outlook Express 6.00.2800.1158 > >X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2800.1165 > >Message-ID: <u4************ **@TK2MSFTNGP09 .phx.gbl> > >Newsgroups: microsoft.publi c.dotnet.langua ges.vb > >NNTP-Posting-Host: aplessis-bouchard-103-2-1-167.w80-11.abo.wanadoo. fr 80.11.60.167 > >Path: cpmsftngxa06.ph x.gbl!TK2MSFTNG P08.phx.gbl!TK2 MSFTNGP09.phx.g bl > >Xref: cpmsftngxa06.ph x.gbl microsoft.publi c.dotnet.langua ges.vb:148341 > >X-Tomcat-NG: microsoft.publi c.dotnet.langua ges.vb > > > >Hi, > > > >I'm trying to read a database file written from a turbo Pascal program. I've > >set a structure to map the records in the file, but > > > >I have problem reading the file when I use VBFixedArray in my structure > >instead of VBFixedString. > >Here is the original code that works: > > > >Structure CCat > > Public code As Short > > <VBFixedString( 17)> Public name As String > > <VBFixedString( 30*10)> Public myList As String ' in fact, array of > >10 strings of 30 chars > >End Structure > > > >Dim cat as CCat > >Dim value as ValueType = cat > >FileGet (1, value) > >cat = CType(value, CCat) > > > >The size of the array my change depending on the customer, so I cannot use a > >fixed size structure. I've tried to replace it this way: > >Structure CCat > > Public code As Short > > <VBFixedString( 17)> Public name As String > > <VBFixedArray(3 0)> Public myList() As String > >End Structure > > > >Dim cat as CCat > >redim cat.myList(9) ' from what I know, this is supposed to > >create an array of 10 strings of 30 chars each. > >Dim value as ValueType = cat > >FileGet (1, value) > >cat = CType(value, CCat) > > > >The fileGet function raises an IOException: Bad record Length. > > > >Can someone tell me what I did wrong ? Also, is there a way to get the > >record length I'm requesting before the FileGet ? > > > >Thanks a lot for your help > >David > > > > > > > > > >
--
Jim Cantwell, Visual Basic .NET Team
This posting is provided "AS IS" with no warranties, and confers no rights. Use of included script samples are subject to the terms specified at http://www.microsoft.com/info/cpyright.htm This thread has been closed and replies have been disabled. Please start a new discussion. Similar topics |
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