I access a dll via dllimport (see below). It workes fine at framework
version 1.1 but now I try to run it in the Beta 1 of VS 2005 and I get
this error message. I have only this problem if a use this function in
a web project.
If I make a standard windows program: no problem.

[DllImport("special.dll", CallingConvention = CallingConvention.Cdecl
)]
private static extern void specialfunction(string name, ....);

Remark:

If I use it in a web project I have to access it via a thread, strange
but it workes.


Has someone an idea?

Dick van der Sar

"Dick van der Sar" <(E-Mail Removed)> wrote in message
news:(E-Mail Removed)...
>I access a dll via dllimport (see below). It workes fine at framework
> version 1.1 but now I try to run it in the Beta 1 of VS 2005 and I get
> this error message. I have only this problem if a use this function in
> a web project.
> If I make a standard windows program: no problem.
>
> [DllImport("special.dll", CallingConvention = CallingConvention.Cdecl
> )]
> private static extern void specialfunction(string name, ....);
>
> Remark:
>
> If I use it in a web project I have to access it via a thread, strange
> but it workes.
>
>
> Has someone an idea?
>
> Dick van der Sar


Please post the whole DllImport function declaration and the C function
export declaration.
Make sure the calling convention is cdecl. Point is that you are passing a
wrong pointer or that are messing with the stack, what would explain why it
works from a separate thread.

Willy.

Ok:

private void opendb()
{
ConnectServerAndOpenDatabase("NDBCN", "NAVISIONSERVER", "tcp", "" ,
8000, true, false, "dick", "");
}

[DllImport("cfront.dll", CallingConvention = CallingConvention.Cdecl)]
private static extern void DBL_ConnectServerAndOpenDatabase(string
NDBCDriverName, string ServerName, string NetType,
string DatabaseName, int CacheSize, bool UseCommitCache, bool
UseNTAuthentication, string UserID, string PassWord);

public void ConnectServerAndOpenDatabase(string NDBCDriverName, string
ServerName, string NetType,
string DatabaseName, int CacheSize, bool UseCommitCache, bool
UseNTAuthentication, string UserID, string PassWord)
{
DBL_ConnectServerAndOpenDatabase(NDBCDriverName, ServerName, NetType,
DatabaseName, CacheSize, UseCommitCache, UseNTAuthentication, UserID,
PassWord);
}


Willy: Can you also explain that you understand "what would explain why
it works from a separate thread."?

Dick


*** Sent via Developersdex http://www.developersdex.com ***

"dick van der sar" <(E-Mail Removed)> wrote in message
news:(E-Mail Removed)...
>
> Ok:
>
> private void opendb()
> {
> ConnectServerAndOpenDatabase("NDBCN", "NAVISIONSERVER", "tcp", "" ,
> 8000, true, false, "dick", "");
> }
>
> [DllImport("cfront.dll", CallingConvention = CallingConvention.Cdecl)]
> private static extern void DBL_ConnectServerAndOpenDatabase(string
> NDBCDriverName, string ServerName, string NetType,
> string DatabaseName, int CacheSize, bool UseCommitCache, bool
> UseNTAuthentication, string UserID, string PassWord);
>
> public void ConnectServerAndOpenDatabase(string NDBCDriverName, string
> ServerName, string NetType,
> string DatabaseName, int CacheSize, bool UseCommitCache, bool
> UseNTAuthentication, string UserID, string PassWord)
> {
> DBL_ConnectServerAndOpenDatabase(NDBCDriverName, ServerName, NetType,
> DatabaseName, CacheSize, UseCommitCache, UseNTAuthentication, UserID,
> PassWord);
> }
>
>
> Willy: Can you also explain that you understand "what would explain why
> it works from a separate thread."?
>
> Dick
>
>
> *** Sent via Developersdex http://www.developersdex.com ***

Dick,

This is good but not yet enough, we need the C function declaration too,
preferably from the header file or from the documentation. Most notably we
need to know what is expected as string and bool.

When you run just this ... ConnectServerAndOpenDatabase on a separate
thread, it might work even if you corrupt the stack, each thread has his own
stack, so when the thread proc returns it's stack is removed anyway.

Willy.