Hello,
i'm having problems to call a api dll in vb dot net.
I absolutely want to use this api call and none of the frame calls.
This is my declaration:
*****************
Public Structure SECURITY_ATTRIBUTES
Public nLength As UInt32
Public lpSecurityDescriptor As IntPtr
Public bInheritHandle As Int32
End Structure
' Desired Access
Public Const FILE_READ_DATA = 1
Public Const FILE_WRITE_DATA = 2
Public Const FILE_APPEND_DATA = 4
' ShareMode
Public Const FILE_SHARE_READ = &H1
Public Const FILE_SHARE_WRITE = &H2
' CreationDisposition
Public Const CREATE_NEW = 1
Public Const OPEN_EXISTING = 3
Declare Function CreateFile Lib "kernel32" Alias "CreateFileA" _
(ByVal lpFileName As String, _
ByVal dwDesiredAccess As Long, _
ByVal dwShareMode As Long, _
ByVal lpSecurityAttributes As SECURITY_ATTRIBUTES, _
ByVal dwCreationDisposition As Long, _
ByVal dwFlagsAndAttributes As Long, _
ByVal hTemplateFile As IntPtr) _
As Long
This is the call:
***********
Dim lFile As Long = LibWrap.CreateFile("c:\test\myfile.dat",
LibWrap.FILE_READ_DATA, LibWrap.FILE_SHARE_READ, Nothing,
LibWrap.OPEN_EXISTING, 0, Nothing)
Anyone an idea?
This is my first api call.
Grtz.
8  2093 
You need to be aware of data type mapping between .Net and the API calls and also be aware that if you are using declarations from
VB5/6 that a VB5/6 Long maps to a VB.Net Integer.
Without looking in any detail, first try changing all Long to Integer in the CreateFile declaration.
--
Al Reid
"news.microsoft.com" <Yv**********@hotmail.com> wrote in message news:u8**************@tk2msftngp13.phx.gbl... Hello,
i'm having problems to call a api dll in vb dot net.
I absolutely want to use this api call and none of the frame calls.
This is my declaration:
*****************
Public Structure SECURITY_ATTRIBUTES
Public nLength As UInt32
Public lpSecurityDescriptor As IntPtr
Public bInheritHandle As Int32
End Structure
' Desired Access
Public Const FILE_READ_DATA = 1
Public Const FILE_WRITE_DATA = 2
Public Const FILE_APPEND_DATA = 4
' ShareMode
Public Const FILE_SHARE_READ = &H1
Public Const FILE_SHARE_WRITE = &H2
' CreationDisposition
Public Const CREATE_NEW = 1
Public Const OPEN_EXISTING = 3
Declare Function CreateFile Lib "kernel32" Alias "CreateFileA" _
(ByVal lpFileName As String, _
ByVal dwDesiredAccess As Long, _
ByVal dwShareMode As Long, _
ByVal lpSecurityAttributes As SECURITY_ATTRIBUTES, _
ByVal dwCreationDisposition As Long, _
ByVal dwFlagsAndAttributes As Long, _
ByVal hTemplateFile As IntPtr) _
As Long
This is the call:
***********
Dim lFile As Long = LibWrap.CreateFile("c:\test\myfile.dat",
LibWrap.FILE_READ_DATA, LibWrap.FILE_SHARE_READ, Nothing,
LibWrap.OPEN_EXISTING, 0, Nothing)
Anyone an idea?
This is my first api call.
Grtz.
I've changed the code with no luck:
Declaration:
*********
Const FILE_READ_DATA = 1
Const OPEN_EXISTING = 3
Const FILE_SHARE_READ = &H1
Const FILE_SHARE_WRITE = &H2
Const FILE_ATTRIBUTE_NORMAL = &H80
<StructLayout(LayoutKind.Sequential)> _
Structure SECURITY_ATTRIBUTES
Public nLength As Int32
Public lpSecurityDescriptor As IntPtr
Public bInheritHandle As Boolean
End Structure
Declare Auto Function CreateFile Lib "kernel32" ( _
ByVal lpFileName As String, _
ByVal dwDesiredAccess As Int32, _
ByVal dwShareMode As Int32, _
ByRef lpSecurityAttributes As IntPtr, _
ByVal dwCreationDistribution As Int32, _
ByVal dwFlagsAndAttributes As Int32, _
ByVal hTemplateFile As IntPtr _
) As IntPtr
Call:
****
Dim fh As IntPtr
fh = CreateFile("c:\test\test.txt", FILE_READ_DATA, FILE_SHARE_READ,
IntPtr.Zero, OPEN_EXISTING, 0, IntPtr.Zero)
If fh.ToInt32 = -1 Then
MessageBox.Show("Invalid")
End If
I don't see what's wrong ...
"Al Reid" <ar*****@reidDASHhome.com> wrote in message
news:%2****************@TK2MSFTNGP09.phx.gbl... You need to be aware of data type mapping between .Net and the API calls
and also be aware that if you are using declarations from VB5/6 that a VB5/6 Long maps to a VB.Net Integer.
Without looking in any detail, first try changing all Long to Integer in
the CreateFile declaration.
--
Al Reid
"news.microsoft.com" <Yv**********@hotmail.com> wrote in message
news:u8**************@tk2msftngp13.phx.gbl... Hello,
i'm having problems to call a api dll in vb dot net.
I absolutely want to use this api call and none of the frame calls.
This is my declaration:
*****************
Public Structure SECURITY_ATTRIBUTES
Public nLength As UInt32
Public lpSecurityDescriptor As IntPtr
Public bInheritHandle As Int32
End Structure
' Desired Access
Public Const FILE_READ_DATA = 1
Public Const FILE_WRITE_DATA = 2
Public Const FILE_APPEND_DATA = 4
' ShareMode
Public Const FILE_SHARE_READ = &H1
Public Const FILE_SHARE_WRITE = &H2
' CreationDisposition
Public Const CREATE_NEW = 1
Public Const OPEN_EXISTING = 3
Declare Function CreateFile Lib "kernel32" Alias "CreateFileA" _
(ByVal lpFileName As String, _
ByVal dwDesiredAccess As Long, _
ByVal dwShareMode As Long, _
ByVal lpSecurityAttributes As SECURITY_ATTRIBUTES, _
ByVal dwCreationDisposition As Long, _
ByVal dwFlagsAndAttributes As Long, _
ByVal hTemplateFile As IntPtr) _
As Long
This is the call:
***********
Dim lFile As Long = LibWrap.CreateFile("c:\test\myfile.dat",
LibWrap.FILE_READ_DATA, LibWrap.FILE_SHARE_READ, Nothing,
LibWrap.OPEN_EXISTING, 0, Nothing)
Anyone an idea?
This is my first api call.
Grtz.
That's because you changed the Longs to Int32, which was no change at all. You need to use either Integer or Int16. A DWORD is two
(2) 8 bit words or a 16-bit integer.
--
Al Reid
"news.microsoft.com" <Yv**********@hotmail.com> wrote in message news:eC**************@tk2msftngp13.phx.gbl... I've changed the code with no luck:
Declaration:
*********
Const FILE_READ_DATA = 1
Const OPEN_EXISTING = 3
Const FILE_SHARE_READ = &H1
Const FILE_SHARE_WRITE = &H2
Const FILE_ATTRIBUTE_NORMAL = &H80
<StructLayout(LayoutKind.Sequential)> _
Structure SECURITY_ATTRIBUTES
Public nLength As Int32
Public lpSecurityDescriptor As IntPtr
Public bInheritHandle As Boolean
End Structure
Declare Auto Function CreateFile Lib "kernel32" ( _
ByVal lpFileName As String, _
ByVal dwDesiredAccess As Int32, _
ByVal dwShareMode As Int32, _
ByRef lpSecurityAttributes As IntPtr, _
ByVal dwCreationDistribution As Int32, _
ByVal dwFlagsAndAttributes As Int32, _
ByVal hTemplateFile As IntPtr _
) As IntPtr
Call:
****
Dim fh As IntPtr
fh = CreateFile("c:\test\test.txt", FILE_READ_DATA, FILE_SHARE_READ,
IntPtr.Zero, OPEN_EXISTING, 0, IntPtr.Zero)
If fh.ToInt32 = -1 Then
MessageBox.Show("Invalid")
End If
I don't see what's wrong ...
"Al Reid" <ar*****@reidDASHhome.com> wrote in message
news:%2****************@TK2MSFTNGP09.phx.gbl... You need to be aware of data type mapping between .Net and the API calls
and also be aware that if you are using declarations from VB5/6 that a VB5/6 Long maps to a VB.Net Integer.
Without looking in any detail, first try changing all Long to Integer in
the CreateFile declaration.
--
Al Reid
"news.microsoft.com" <Yv**********@hotmail.com> wrote in message
news:u8**************@tk2msftngp13.phx.gbl... Hello,
i'm having problems to call a api dll in vb dot net.
I absolutely want to use this api call and none of the frame calls.
This is my declaration:
*****************
Public Structure SECURITY_ATTRIBUTES
Public nLength As UInt32
Public lpSecurityDescriptor As IntPtr
Public bInheritHandle As Int32
End Structure
' Desired Access
Public Const FILE_READ_DATA = 1
Public Const FILE_WRITE_DATA = 2
Public Const FILE_APPEND_DATA = 4
' ShareMode
Public Const FILE_SHARE_READ = &H1
Public Const FILE_SHARE_WRITE = &H2
' CreationDisposition
Public Const CREATE_NEW = 1
Public Const OPEN_EXISTING = 3
Declare Function CreateFile Lib "kernel32" Alias "CreateFileA" _
(ByVal lpFileName As String, _
ByVal dwDesiredAccess As Long, _
ByVal dwShareMode As Long, _
ByVal lpSecurityAttributes As SECURITY_ATTRIBUTES, _
ByVal dwCreationDisposition As Long, _
ByVal dwFlagsAndAttributes As Long, _
ByVal hTemplateFile As IntPtr) _
As Long
This is the call:
***********
Dim lFile As Long = LibWrap.CreateFile("c:\test\myfile.dat",
LibWrap.FILE_READ_DATA, LibWrap.FILE_SHARE_READ, Nothing,
LibWrap.OPEN_EXISTING, 0, Nothing)
Anyone an idea?
This is my first api call.
Grtz.
I tried it but that doesn't work either.
thanks.
"Al Reid" <ar*****@reidDASHhome.com> wrote in message
news:%2****************@TK2MSFTNGP10.phx.gbl... That's because you changed the Longs to Int32, which was no change at all.
You need to use either Integer or Int16. A DWORD is two (2) 8 bit words or a 16-bit integer.
--
Al Reid
"news.microsoft.com" <Yv**********@hotmail.com> wrote in message
news:eC**************@tk2msftngp13.phx.gbl... I've changed the code with no luck:
Declaration:
*********
Const FILE_READ_DATA = 1
Const OPEN_EXISTING = 3
Const FILE_SHARE_READ = &H1
Const FILE_SHARE_WRITE = &H2
Const FILE_ATTRIBUTE_NORMAL = &H80
<StructLayout(LayoutKind.Sequential)> _
Structure SECURITY_ATTRIBUTES
Public nLength As Int32
Public lpSecurityDescriptor As IntPtr
Public bInheritHandle As Boolean
End Structure
Declare Auto Function CreateFile Lib "kernel32" ( _
ByVal lpFileName As String, _
ByVal dwDesiredAccess As Int32, _
ByVal dwShareMode As Int32, _
ByRef lpSecurityAttributes As IntPtr, _
ByVal dwCreationDistribution As Int32, _
ByVal dwFlagsAndAttributes As Int32, _
ByVal hTemplateFile As IntPtr _
) As IntPtr
Call:
****
Dim fh As IntPtr
fh = CreateFile("c:\test\test.txt", FILE_READ_DATA, FILE_SHARE_READ,
IntPtr.Zero, OPEN_EXISTING, 0, IntPtr.Zero)
If fh.ToInt32 = -1 Then
MessageBox.Show("Invalid")
End If
I don't see what's wrong ...
"Al Reid" <ar*****@reidDASHhome.com> wrote in message
news:%2****************@TK2MSFTNGP09.phx.gbl... You need to be aware of data type mapping between .Net and the API
calls and also be aware that if you are using declarations from VB5/6 that a VB5/6 Long maps to a VB.Net Integer.
Without looking in any detail, first try changing all Long to Integer
in the CreateFile declaration.
--
Al Reid
"news.microsoft.com" <Yv**********@hotmail.com> wrote in message
news:u8**************@tk2msftngp13.phx.gbl... > Hello,
>
> i'm having problems to call a api dll in vb dot net.
> I absolutely want to use this api call and none of the frame calls.
>
> This is my declaration:
> *****************
> Public Structure SECURITY_ATTRIBUTES
> Public nLength As UInt32
> Public lpSecurityDescriptor As IntPtr
> Public bInheritHandle As Int32
> End Structure
>
> ' Desired Access
> Public Const FILE_READ_DATA = 1
> Public Const FILE_WRITE_DATA = 2
> Public Const FILE_APPEND_DATA = 4
>
> ' ShareMode
> Public Const FILE_SHARE_READ = &H1
> Public Const FILE_SHARE_WRITE = &H2
>
> ' CreationDisposition
> Public Const CREATE_NEW = 1
> Public Const OPEN_EXISTING = 3
>
> Declare Function CreateFile Lib "kernel32" Alias "CreateFileA" _
> (ByVal lpFileName As String, _
> ByVal dwDesiredAccess As Long, _
> ByVal dwShareMode As Long, _
> ByVal lpSecurityAttributes As SECURITY_ATTRIBUTES, _
> ByVal dwCreationDisposition As Long, _
> ByVal dwFlagsAndAttributes As Long, _
> ByVal hTemplateFile As IntPtr) _
> As Long
>
>
> This is the call:
> ***********
>
> Dim lFile As Long = LibWrap.CreateFile("c:\test\myfile.dat",
> LibWrap.FILE_READ_DATA, LibWrap.FILE_SHARE_READ, Nothing,
> LibWrap.OPEN_EXISTING, 0, Nothing)
>
>
> Anyone an idea?
> This is my first api call.
>
> Grtz.
>
>
"news.microsoft.com" <Yv**********@hotmail.com> schrieb: i'm having problems to call a api dll in vb dot net.
I absolutely want to use this api call and none of the frame calls.
Any reason for using 'CreateFile' instead of .NET's 'System.IO.FileStream'
class or similar classes?
--
M S Herfried K. Wagner
M V P <URL:http://dotnet.mvps.org/>
V B <URL:http://classicvb.org/petition/>
See inline
"Al Reid" <ar*****@reidDASHhome.com> wrote in message
news:%2****************@TK2MSFTNGP10.phx.gbl... That's because you changed the Longs to Int32, which was no change at all.
You need to use either Integer or Int16. A DWORD is two
(2) 8 bit words or a 16-bit integer.
Ehh, no. A DWORD is 32 bits, same as Long in VB6 and Int32/Integer in VB.NET
--
Al Reid
"news.microsoft.com" <Yv**********@hotmail.com> wrote in message
news:eC**************@tk2msftngp13.phx.gbl... I've changed the code with no luck:
Declaration:
*********
Const FILE_READ_DATA = 1
Const OPEN_EXISTING = 3
Const FILE_SHARE_READ = &H1
Const FILE_SHARE_WRITE = &H2
Const FILE_ATTRIBUTE_NORMAL = &H80
<StructLayout(LayoutKind.Sequential)> _
Structure SECURITY_ATTRIBUTES
Public nLength As Int32
Public lpSecurityDescriptor As IntPtr
Public bInheritHandle As Boolean
End Structure
Declare Auto Function CreateFile Lib "kernel32" ( _
ByVal lpFileName As String, _
ByVal dwDesiredAccess As Int32, _
ByVal dwShareMode As Int32, _
ByRef lpSecurityAttributes As IntPtr, _
ByVal dwCreationDistribution As Int32, _
ByVal dwFlagsAndAttributes As Int32, _
ByVal hTemplateFile As IntPtr _
) As IntPtr
Call:
****
Dim fh As IntPtr
fh = CreateFile("c:\test\test.txt", FILE_READ_DATA, FILE_SHARE_READ,
IntPtr.Zero, OPEN_EXISTING, 0, IntPtr.Zero)
If fh.ToInt32 = -1 Then
MessageBox.Show("Invalid")
End If
I don't see what's wrong ...
Try this:
Const FILE_READ_DATA As Int32 = 1
Const OPEN_EXISTING As Int32 = 3
Const FILE_SHARE_READ As Int32 = &H1
Const FILE_SHARE_WRITE As Int32 = &H2
Const FILE_ATTRIBUTE_NORMAL As Int32 = &H80
<StructLayout(LayoutKind.Sequential)> _
Structure SECURITY_ATTRIBUTES
Public nLength As Int32
Public lpSecurityDescriptor As IntPtr
Public bInheritHandle As Boolean
End Structure
Declare Auto Function CreateFile Lib "kernel32" ( _
<MarshalAs(UnmanagedType.LPTStr)> ByVal lpFileName As String, _
ByVal dwDesiredAccess As Int32, _
ByVal dwShareMode As Int32, _
ByRef lpSecurityAttributes As SECURITY_ATTRIBUTES, _
ByVal dwCreationDistribution As Int32, _
ByVal dwFlagsAndAttributes As Int32, _
ByVal hTemplateFile As IntPtr _
) As IntPtr
If this doesn't work try changing the lpSecurityAttributes parameter to
ByVal instead of ByRef
/claes
Sorry, ehh, you're right. My bad. Anyhow, when converting VB5/6 Declarations, the VB5/6 Long converts to a VB.Net Integer.
Also the SECURITY_ATTRIBUTES structure needs to be adjusted as well.
--
Al Reid
"Claes Bergefall" <cl*************@nospam.nospam> wrote in message news:em**************@tk2msftngp13.phx.gbl... See inline
"Al Reid" <ar*****@reidDASHhome.com> wrote in message
news:%2****************@TK2MSFTNGP10.phx.gbl... That's because you changed the Longs to Int32, which was no change at all.
You need to use either Integer or Int16. A DWORD is two
(2) 8 bit words or a 16-bit integer.
Ehh, no. A DWORD is 32 bits, same as Long in VB6 and Int32/Integer in VB.NET
--
Al Reid
"news.microsoft.com" <Yv**********@hotmail.com> wrote in message
news:eC**************@tk2msftngp13.phx.gbl... I've changed the code with no luck:
Declaration:
*********
Const FILE_READ_DATA = 1
Const OPEN_EXISTING = 3
Const FILE_SHARE_READ = &H1
Const FILE_SHARE_WRITE = &H2
Const FILE_ATTRIBUTE_NORMAL = &H80
<StructLayout(LayoutKind.Sequential)> _
Structure SECURITY_ATTRIBUTES
Public nLength As Int32
Public lpSecurityDescriptor As IntPtr
Public bInheritHandle As Boolean
End Structure
Declare Auto Function CreateFile Lib "kernel32" ( _
ByVal lpFileName As String, _
ByVal dwDesiredAccess As Int32, _
ByVal dwShareMode As Int32, _
ByRef lpSecurityAttributes As IntPtr, _
ByVal dwCreationDistribution As Int32, _
ByVal dwFlagsAndAttributes As Int32, _
ByVal hTemplateFile As IntPtr _
) As IntPtr
Call:
****
Dim fh As IntPtr
fh = CreateFile("c:\test\test.txt", FILE_READ_DATA, FILE_SHARE_READ,
IntPtr.Zero, OPEN_EXISTING, 0, IntPtr.Zero)
If fh.ToInt32 = -1 Then
MessageBox.Show("Invalid")
End If
I don't see what's wrong ...
Try this:
Const FILE_READ_DATA As Int32 = 1
Const OPEN_EXISTING As Int32 = 3
Const FILE_SHARE_READ As Int32 = &H1
Const FILE_SHARE_WRITE As Int32 = &H2
Const FILE_ATTRIBUTE_NORMAL As Int32 = &H80
<StructLayout(LayoutKind.Sequential)> _
Structure SECURITY_ATTRIBUTES
Public nLength As Int32
Public lpSecurityDescriptor As IntPtr
Public bInheritHandle As Boolean
End Structure
Declare Auto Function CreateFile Lib "kernel32" ( _
<MarshalAs(UnmanagedType.LPTStr)> ByVal lpFileName As String, _
ByVal dwDesiredAccess As Int32, _
ByVal dwShareMode As Int32, _
ByRef lpSecurityAttributes As SECURITY_ATTRIBUTES, _
ByVal dwCreationDistribution As Int32, _
ByVal dwFlagsAndAttributes As Int32, _
ByVal hTemplateFile As IntPtr _
) As IntPtr
If this doesn't work try changing the lpSecurityAttributes parameter to
ByVal instead of ByRef
/claes
That did it.
Thank you all.
"Claes Bergefall" <cl*************@nospam.nospam> wrote in message
news:em**************@tk2msftngp13.phx.gbl... See inline
"Al Reid" <ar*****@reidDASHhome.com> wrote in message
news:%2****************@TK2MSFTNGP10.phx.gbl... That's because you changed the Longs to Int32, which was no change at
all. You need to use either Integer or Int16. A DWORD is two
(2) 8 bit words or a 16-bit integer.
Ehh, no. A DWORD is 32 bits, same as Long in VB6 and Int32/Integer in
VB.NET
--
Al Reid
"news.microsoft.com" <Yv**********@hotmail.com> wrote in message
news:eC**************@tk2msftngp13.phx.gbl... I've changed the code with no luck:
Declaration:
*********
Const FILE_READ_DATA = 1
Const OPEN_EXISTING = 3
Const FILE_SHARE_READ = &H1
Const FILE_SHARE_WRITE = &H2
Const FILE_ATTRIBUTE_NORMAL = &H80
<StructLayout(LayoutKind.Sequential)> _
Structure SECURITY_ATTRIBUTES
Public nLength As Int32
Public lpSecurityDescriptor As IntPtr
Public bInheritHandle As Boolean
End Structure
Declare Auto Function CreateFile Lib "kernel32" ( _
ByVal lpFileName As String, _
ByVal dwDesiredAccess As Int32, _
ByVal dwShareMode As Int32, _
ByRef lpSecurityAttributes As IntPtr, _
ByVal dwCreationDistribution As Int32, _
ByVal dwFlagsAndAttributes As Int32, _
ByVal hTemplateFile As IntPtr _
) As IntPtr
Call:
****
Dim fh As IntPtr
fh = CreateFile("c:\test\test.txt", FILE_READ_DATA, FILE_SHARE_READ,
IntPtr.Zero, OPEN_EXISTING, 0, IntPtr.Zero)
If fh.ToInt32 = -1 Then
MessageBox.Show("Invalid")
End If
I don't see what's wrong ...
Try this:
Const FILE_READ_DATA As Int32 = 1
Const OPEN_EXISTING As Int32 = 3
Const FILE_SHARE_READ As Int32 = &H1
Const FILE_SHARE_WRITE As Int32 = &H2
Const FILE_ATTRIBUTE_NORMAL As Int32 = &H80
<StructLayout(LayoutKind.Sequential)> _
Structure SECURITY_ATTRIBUTES
Public nLength As Int32
Public lpSecurityDescriptor As IntPtr
Public bInheritHandle As Boolean
End Structure
Declare Auto Function CreateFile Lib "kernel32" ( _
<MarshalAs(UnmanagedType.LPTStr)> ByVal lpFileName As String, _
ByVal dwDesiredAccess As Int32, _
ByVal dwShareMode As Int32, _
ByRef lpSecurityAttributes As SECURITY_ATTRIBUTES, _
ByVal dwCreationDistribution As Int32, _
ByVal dwFlagsAndAttributes As Int32, _
ByVal hTemplateFile As IntPtr _
) As IntPtr
If this doesn't work try changing the lpSecurityAttributes parameter to
ByVal instead of ByRef
/claes
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