In my VB.NET application, I'm trying to call a function from a 32-bit,
non-.NET dll file and I'm having problems.  I believe I have the
correct signature for the dll with:

<System.Runtime.InteropServices.DllImportAttribute("asdHTMLCompare.dll")>
_
Public Shared Function BuildCompositeFile(ByVal szOldFile As
System.IntPtr, _
ByVal szNewFile As System.IntPtr, _
ByVal szCompositeFile As System.IntPtr, _
ByVal szOldPrefix As System.IntPtr, _
ByVal szNewPrefix As System.IntPtr, _
ByVal szCompositePrefix As System.IntPtr, _
ByVal bCheckForChangedImages As System.Boolean) As System.Int32
End Function


I'm trying to call this function with the following code:

Dim html1 As System.String = "c:\test1.htm"
Dim html2 As System.String = "c:\test2.htm"
Dim composite As System.String = "c:\changes.htm"

Dim changes As System.Int32 = GlobalApp.BuildCompositeFile( _
System.Runtime.InteropServices.Marshal.ReadIntPtr(html1, 0), _
System.Runtime.InteropServices.Marshal.ReadIntPtr(html2, 0), _
System.Runtime.InteropServices.Marshal.ReadIntPtr(composite, 0), _
System.Runtime.InteropServices.Marshal.ReadIntPtr(".htm", 0), _
System.Runtime.InteropServices.Marshal.ReadIntPtr(".htm", 0), _
System.Runtime.InteropServices.Marshal.ReadIntPtr(".htm", 0), _
True)

When I run this, I get the error:
An exception of type 'System.EntryPointNotFoundException' occurred in
ProductVision.Windows.Forms.dll but was not handled in user code.
Additional information: Unable to find an entry point named
'BuildCompositeFile' in DLL 'asdHTMLCompare.dll'.

What am I doing wrong?

Thanks in advance!
Dave

Am 08.06.2010 00:05, schrieb Dave Wurtz:
Maybe the function has a different name.  You may want to use Dependency
Walker (<URL:http://www.dependencywalker.com/>) to examine the function
the DLL exports.

On Jun 7, 5:16 pm, "Herfried K. Wagner [MVP]" <hirf-spam-me-
h***@gmx.at> wrote:
Show quoteHide quoteThanks for the reply.

As suggested, I downloaded the Dependency Walker program and opened
the DLL.  In looking at the function I want to call and selecting
"Undecorate C++ Functions", this is what it shows:

int BuildCompositeFile(char *,char *,char *,char *,char *,char *,int)

Do I have the correct signature defined?

Thanks.
Dave

On Jun 8, 7:56 am, Dave Wurtz <dave_wu***@asdsoftware.com> wrote:
Show quoteHide quoteCan anyone tell me if I have the correct signature defined here?  Once
again, Dependency Walker showed the following for the function inside
the DLL that I am trying to call:

int BuildCompositeFile(char *,char *,char *,char *,char *,char *,int)

I have tried to create the equivalent signature in my VB.Net
application:


<System.Runtime.InteropServices.DllImportAttribute("asdHTMLCompare.dll")>
_
    Public Shared Function BuildCompositeFile(ByVal szOldFile As
String, _

ByVal szNewFile As String, _

ByVal szCompositeFile As String, _

ByVal szOldPrefix As String, _

ByVal szNewPrefix As String, _

ByVal szCompositePrefix As String, _

ByVal bCheckForChangedImages As Integer) As Integer
    End Function

I must be doing something wrong because when I call the function, I
get the error:

An exception of type 'System.EntryPointNotFoundException' occurred in
ProductVision.Windows.Forms.dll but was not handled in user code.
Additional information: Unable to find an entry point named
'BuildCompositeFile' in DLL 'asdHTMLCompare.dll'.

Can someone help me with this please.

Thanks in advance!
Dave

.Net Developer - Little Rock, AR (Citizens may only apply)
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