load/unload C dll with C# problems

Posted by Goran on Stack Overflow See other posts from Stack Overflow or by Goran
Published on 2010-04-12T18:36:39Z Indexed on 2010/04/12 18:43 UTC
Read the original article Hit count: 405

Filed under:

c

|

dll

|

c#

|

load

|

unload

I'm having problems with external native DLL.

I'm working on ASP.NET 1.1 web application and have this DLL which I load through DLLImport directives.

This is how I map DLL functions:

    [DllImport("somedllname",  CallingConvention=CallingConvention.StdCall)] 
    public static extern int function1(string lpFileName,string lpOwnerPw,string lpUserPw);

    [DllImport("somedllname",  CallingConvention=CallingConvention.StdCall)] 
    public static extern int function2(int nHandle);

I call the dll methods and all works great, but I have problems with this DLL crashing my web site on some cases, so I would like an option to unload the dll after I use it.

I found a solution at this link, but I don't have 'UnmanagedFunctionPointer' attribute in .NET 1.1 available.

http://blogs.msdn.com/jonathanswift/archive/2006/10/03/Dynamically-calling-an-unmanaged-dll-from-.NET-_2800_C_23002900_.aspx

Is there a way I can achieve what this guy did with his example?

Related posts about dll

Mixing Silverlight-Specific System.Xml.Linq dll with Non-Silverlight System.Xml.Linq dll

as seen on Stack Overflow - Search for 'Stack Overflow'
I have a Logic layer that references Silverlight's System.Xml.Linq dll and a GUI that is in WPF (hence using the non-Silverlight System.Xml.Linq dll). When I attempt to pass an XElement from GUI project to a method in the Logic project, I am getting (basically) "XElement is not of type XElement" errors… >>> More
SetupAPI.DLL to HID.DLL

as seen on Stack Overflow - Search for 'Stack Overflow'
With the SetupAPI.DLL I execute Function SetupDiGetClassDevs and get a pointer or handle Then Begin a loop Then I run Return = Function SetupDiEnumDeviceInterfaces with SP_DEVICE_INTERFACE_DATA.cbSize = 0 to get my size of what SP_DEVICE_INTERFACE_DATA needs to be Then I set size and execute again… >>> More
ASP.Net error: “The type ‘foo’ exists in both ”temp1.dll“ and ”temp2.dll" (pt 2)

as seen on Stack Overflow - Search for 'Stack Overflow'
I'm experiencing the same problem as in this question, but none of the answers fixed my problem. (edit: Setting the web.config batch attribute works, but that's a coverup, not a solution) The problem I'm having is with a User Control that I moved from the root directory to a subdirectory within the… >>> More
Application Specific Paths for DLL Loading when DLL is loaded dynamically

as seen on Stack Overflow - Search for 'Stack Overflow'
Hi: I am building a program that uses a very simple plugin system. This is the code I'm using to load the possible plugins: public interface IPlugin { string Name { get; } string Description { get; } bool Execute(System.Windows.Forms.IWin32Window parent); } private void loadPlugins() … >>> More
StackOverflow Exception in Umanaged Dll When Called from Managed DLL

as seen on Stack Overflow - Search for 'Stack Overflow'
My question is similar to this one here, but there are some difference. I have a fortran dll as the backend, and a C# exe as the front end. I use PInvoke to pass data between them. There are 22 parameters between the C# and the fortran code. And some of them are integer, double, pointers ( C#… >>> More

Developer IT