Re: DllImport with ASP.NET ?
From: Brian Anderson (nospam_at_127.0.0.1)
Date: 12/26/04
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- In reply to: Chris R. Timmons: "Re: DllImport with ASP.NET ?"
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Date: Sun, 26 Dec 2004 08:58:00 -0000
Hello Chris !
> You stated that using pac.dll's full path in the DllImport
> attibute didn't work. Did you get an error message?
> If so, what was it?
It was exactly the same error message (not found).
Will try your tip and report back.
Thx!
---
"Chris R. Timmons" <crtimmons@X_NOSPAM_Xcrtimmonsinc.com> wrote in message
news:Xns95CAB4AAA66BBcrtimmonscrtimmonsin@207.46.248.16...
> "Brian Anderson" <nospam@127.0.0.1> wrote in
> news:eXDWhys6EHA.1264@TK2MSFTNGP12.phx.gbl:
>
> > Hello,
> >
> > is it possible to use DllImport to call a DLL in ASP.NET ?
> > Or is it necessarry that my DLL has to be copied into \System32
> > ?
> >
> > My DLL is a native C++ 7.1 DLL (not managed, no COM, no
> > regsvr32) and uses Assembler to make some math in SSE.
> > The result is given out as an Int.
> >
> > Using a C# console app (code below) it work fine & fast.
> >
> > However, once again ASP.NET refuses to execute my inline ASP.NET
> > code (code below).
> >
> > Error Code:
> >
> > Description: An unhandled exception occurred during the
> > execution of the current web request. Please review the stack
> > trace for more information about the error and where it
> > originated in the code. Exception Details:
> > System.DllNotFoundException: Unable to load DLL (pac.dll).nable
> > to load DLL (pac.dll).]Stack Trace: [DllNotFoundException:
> > Unable to load DLL (pac.dll).]
> >
> > :(
> >
> > Even the tip out of G00gle to use the full path in DllImport
> > wasn't a solution.
> > I've check this on my ISPs websapce and on my local IIS6.
> >
> > Is the reason for this problem the general extremely
> > over-limited runtime permission of ASP.NET ?
> > Can ASP.NET or IIS6 be told to allow DllImport calls to my DLL ?
> > My ISP is ready to make configuration changes for my case but
> > don't know a solution, too.
> >
> > Thx for your opinions !
> >
> >
> > // Code EXE Console
> >
> > public class Class1
> > {
> > [DllImport("pac.dll")]
> > public static extern int PaqGetVersion();
> >
> > public static void Main(string[] args)
> > {
> > int t = Class1.PaqGetVersion();
> > Console.WriteLine(t);
> >
> > [...]
> >
> >
> > // CODE ASP.NET
> >
> ><%@ Page Language="C#" Debug="true" %>
> ><%@ Import Namespace="System.Runtime.InteropServices" %>
> ><HTML>
> ><HEAD>
> ><Meta Name="CODE_LANGUAGE" Content="C#">
> >
> ><Script Language=CS Runat=Server>
> >
> > [DllImport(@"pac.dll")]
> > public static extern int PaqGetVersion();
> >
> > void Page_Load(object sender, System.EventArgs e)
> > {
> > int i = PaqarGetVersion();
> > TextBox1.Text = i.ToString();
> > }
> > </script>
> ></HEAD>
> >
> > [...]
>
> Brian,
>
> It could be a security problem, but it seems more likely that
> pac.dll is not being found. This is because it is not in the same
> folder as your .aspx page dll [*1], nor is it on the system's
> search path for dlls [*2].
>
> You stated that using pac.dll's full path in the DllImport
> attibute didn't work. Did you get an error message?
> If so, what was it?
>
> It's also possible that your application does not have
> sufficient permissions to call unmanaged code. You can
> find out by running the .aspx page at the end of this article.
>
> If your page cannot call unmanaged code, you will need to have
> your ISP configure the .Net security to grant your pages that
> permission.
>
> --
> Hope this helps.
>
> Chris.
> -------------
> C.R. Timmons Consulting, Inc.
> http://www.crtimmonsinc.com/
>
> ------------------------------------------------------------
>
> [*1]
> ASP.Net compiles each in-lined .aspx page into its own separate
> DLL and places it in a temporary directory under c:\windows\microsoft.net.
> An example would be:
>
> C:\WINDOWS\Microsoft.NET\Framework\v1.1.4322\Temporary ASP.NET
Files\WebApplication1\64f05764\576f54e7
>
> There's no way to know what name ASP.Net will give this temporary
> directory, so you can't put pac.dll there.
>
> In contrast, code in separate code-behind files is compiled into a
> single DLL, and that is placed into a \bin folder under the web
application,
> e.g. c:\inetpub\wwwroot\WebApplication1\bin.
>
> [*2]
>
> Windows uses the algorithm described here to locate DLLs:
>
>
http://msdn.microsoft.com/library/default.asp?url=/library/en-us/dllproc/base/loadlibrary.asp
>
> ------------------------------------------------------------
>
> <%@ Page Language="C#" AutoEventWireup="True" %>
> <%@ Import Namespace="System.Security" %>
> <%@ Import Namespace="System.Security.Permissions" %>
>
> <html>
> <script runat="server">
>
> private static bool CanCallUnmanagedCode
> {
> get
> {
> try
> {
> new
SecurityPermission(SecurityPermissionFlag.UnmanagedCode).Demand();
> }
> catch(SecurityException)
> {
> return false;
> }
>
> return true;
> }
> }
>
> void Page_Load(Object sender, EventArgs e)
> {
> if (CanCallUnmanagedCode)
> Label1.Text = "This page can call unmanaged code.";
> else
> Label1.Text = "This page can NOT call unmanaged code.";
> }
>
> </script>
>
> <body>
> <form runat=server>
> <asp:Label id="Label1" Text="Label Control" runat="server"/>
> </form>
> </body>
> </html>
- Previous message: Willy: "Include User Control in Repeater Control"
- In reply to: Chris R. Timmons: "Re: DllImport with ASP.NET ?"
- Messages sorted by: [ date ] [ thread ]
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