DllImport and Windows 2000

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Hello, Newsgroupians:

I have created an unmanaged DLL using Visual Studio 2005, which was created
in Visual C++. I have some functions in the DLL that I am trying to call.
When I "dumpbin -exports ManipLib.dll" I can see all of my exported
functions, which I have defined in my definition file. They are not name
mangled or decorated.

Now, when I call the function in my C# program, I have the following
definition...

[System.Runtime. InteropServices .DllImport(@".\ ManipLib.dll", CharSet =
System.Runtime. InteropServices .CharSet.Unicod e)]
public static extern IntPtr UserFindWindowW (string lpszWndClass);

All UserFindWindowW does is call FindWindowEx(). Now, I know I can import
the user32.dll instead of this, but I have some other methods later that wrap
functionality of what I am going to do to the window, so this is just my base
case, and it doesn't work in Windows 2000.

When I run the program in WindowsXP, the function succeeds and returns an
IntPtr, or handle, to the window I'm looking for. However, when I run the
program in Windows2000, I am constantly receiving a
System.DllNotFo undException: "Unable to load DLL '.\ManipLib.dll ': The
specified procedure could not be found. (Exception from HRESULT: 0x8007007F)."

Now, I know the working directory contains the DLL that I have created, for
just prior to making my extern-call, I do a
MessageBox.Show (System.IO.Dire ctory.GetCurren tDirectory()); This shows my
current working directory correctly, which the directory also contains my
ManipLib.dll. As soon as I hit "OK," the exception is thrown as it tries to
call my DLL method.

What would make this program work for all versions of XP that I have tried,
but continually fail for every Windows 2000 version? I've tried 4 computers
with Windows 2000, each has SP4. Thank you for your help.
Trecius

[Ashutosh Bhawasinka]

Not sure what's the issue here. Seems that there is difference in the
way the files are searched.

Try to use this (Remove ".\" before the dll's name)

[System.Runtime. InteropServices .DllImport(@"Ma nipLib.dll", CharSet =
System.Runtime. InteropServices .CharSet.Unicod e)]

-
Ashutosh

Trecius wrote:

Hello, Newsgroupians:

I have created an unmanaged DLL using Visual Studio 2005, which was created
in Visual C++. I have some functions in the DLL that I am trying to call.
When I "dumpbin -exports ManipLib.dll" I can see all of my exported
functions, which I have defined in my definition file. They are not name
mangled or decorated.

Now, when I call the function in my C# program, I have the following
definition...

[System.Runtime. InteropServices .DllImport(@".\ ManipLib.dll", CharSet =
System.Runtime. InteropServices .CharSet.Unicod e)]
public static extern IntPtr UserFindWindowW (string lpszWndClass);

All UserFindWindowW does is call FindWindowEx(). Now, I know I can import
the user32.dll instead of this, but I have some other methods later that wrap
functionality of what I am going to do to the window, so this is just my base
case, and it doesn't work in Windows 2000.

When I run the program in WindowsXP, the function succeeds and returns an
IntPtr, or handle, to the window I'm looking for. However, when I run the
program in Windows2000, I am constantly receiving a
System.DllNotFo undException: "Unable to load DLL '.\ManipLib.dll ': The
specified procedure could not be found. (Exception from HRESULT: 0x8007007F)."

Now, I know the working directory contains the DLL that I have created, for
just prior to making my extern-call, I do a
MessageBox.Show (System.IO.Dire ctory.GetCurren tDirectory()); This shows my
current working directory correctly, which the directory also contains my
ManipLib.dll. As soon as I hit "OK," the exception is thrown as it tries to
call my DLL method.

What would make this program work for all versions of XP that I have tried,
but continually fail for every Windows 2000 version? I've tried 4 computers
with Windows 2000, each has SP4. Thank you for your help.
Trecius