Question: run time error using a native lib

[Ladvánszky Károly]

I'm trying to use a statically linked C library. I've wrapped a .NET C++ DLL
around this lib and trying to drive the wrapper from a .NET VB testbed. The
whole build succeeds but I get the following error message at runtime:

An unhandled exception of type 'System.TypeLoadException' occurred in
TiffLibXTester.exe

Additional information: Could not load type tiff from assembly TiffLibX,
Version=1.0.1425.19884, Culture=neutral, PublicKeyToken=null.

I would appreciate any help on this and in general, on what the best way is
to use legacy libraries (either lib or dll) from .NET.

Thanks,

Ladvánszky Károly

[Pent]

it's probably forward declared as
struct tiff;
What you need to do in MC++ is:
struct tiff{};

"Ladvánszky Károly" <[e-mail]> wrote in message
news:%2***************@TK2MSFTNGP09.phx.gbl...

I'm trying to use a statically linked C library. I've wrapped a .NET C++ DLL around this lib and trying to drive the wrapper from a .NET VB testbed. The whole build succeeds but I get the following error message at runtime:

An unhandled exception of type 'System.TypeLoadException' occurred in
TiffLibXTester.exe

Additional information: Could not load type tiff from assembly TiffLibX,
Version=1.0.1425.19884, Culture=neutral, PublicKeyToken=null.

I would appreciate any help on this and in general, on what the best way is to use legacy libraries (either lib or dll) from .NET.

Thanks,

Ladvánszky Károly

[Ladvánszky Károly]

Thanks for your answer.
Where should I place it in MC++? Everything compiles and links with no
problem.

Károly

"Pent" <pent> az alábbiakat írta a következõ hírüzenetben:
#5*************@TK2MSFTNGP11.phx.gbl...

it's probably forward declared as
struct tiff;
What you need to do in MC++ is:
struct tiff{};

"Ladvánszky Károly" <[e-mail]> wrote in message
news:%2***************@TK2MSFTNGP09.phx.gbl...

I'm trying to use a statically linked C library. I've wrapped a .NET C++

DLL

around this lib and trying to drive the wrapper from a .NET VB testbed.

The

whole build succeeds but I get the following error message at runtime:

An unhandled exception of type 'System.TypeLoadException' occurred in
TiffLibXTester.exe

Additional information: Could not load type tiff from assembly TiffLibX,
Version=1.0.1425.19884, Culture=neutral, PublicKeyToken=null.

I would appreciate any help on this and in general, on what the best way

is

to use legacy libraries (either lib or dll) from .NET.

Thanks,

Ladvánszky Károly

[Pent]

anywhere

"Ladvánszky Károly" <[e-mail]> wrote in message
news:eG**************@TK2MSFTNGP12.phx.gbl...

Thanks for your answer.
Where should I place it in MC++? Everything compiles and links with no
problem.

Károly

"Pent" <pent> az alábbiakat írta a következõ hírüzenetben:
#5*************@TK2MSFTNGP11.phx.gbl...

it's probably forward declared as
struct tiff;
What you need to do in MC++ is:
struct tiff{};

"Ladvánszky Károly" <[e-mail]> wrote in message
news:%2***************@TK2MSFTNGP09.phx.gbl...

I'm trying to use a statically linked C library. I've wrapped a .NET C++

DLL

around this lib and trying to drive the wrapper from a .NET VB

testbed. The

whole build succeeds but I get the following error message at runtime:

An unhandled exception of type 'System.TypeLoadException' occurred in
TiffLibXTester.exe

Additional information: Could not load type tiff from assembly

TiffLibX, Version=1.0.1425.19884, Culture=neutral, PublicKeyToken=null.

I would appreciate any help on this and in general, on what the best

way is

to use legacy libraries (either lib or dll) from .NET.

Thanks,

Ladvánszky Károly

[Ladvánszky Károly]

To my surprise, it has worked. I have the source files of the library in
question and struct tiff is declared.
What does this empty struct declaration do?
Could you please explain the solution a little more detailed?
Is it MC++ specific?

Thanks,

Károly
"Pent" <pent> az alábbiakat írta a következõ hírüzenetben:
e6**************@TK2MSFTNGP11.phx.gbl...

anywhere

"Ladvánszky Károly" <[e-mail]> wrote in message
news:eG**************@TK2MSFTNGP12.phx.gbl...

Thanks for your answer.
Where should I place it in MC++? Everything compiles and links with no
problem.

Károly

"Pent" <pent> az alábbiakat írta a következõ hírüzenetben:
#5*************@TK2MSFTNGP11.phx.gbl...

it's probably forward declared as
struct tiff;
What you need to do in MC++ is:
struct tiff{};

"Ladvánszky Károly" <[e-mail]> wrote in message
news:%2***************@TK2MSFTNGP09.phx.gbl...
> I'm trying to use a statically linked C library. I've wrapped a .NET C++ DLL
> around this lib and trying to drive the wrapper from a .NET VB testbed. The
> whole build succeeds but I get the following error message at runtime: >
> An unhandled exception of type 'System.TypeLoadException' occurred in > TiffLibXTester.exe
>
> Additional information: Could not load type tiff from assembly TiffLibX, > Version=1.0.1425.19884, Culture=neutral, PublicKeyToken=null.
>
> I would appreciate any help on this and in general, on what the best way is
> to use legacy libraries (either lib or dll) from .NET.
>
> Thanks,
>
> Ladvánszky Károly
>
>

[Pent]

Forward declarations prevent MC++ compiler from generating "metadata" for
these types.

http://www.winterdom.com/mcppfaq/archives/000262.html
http://groups.google.com/groups?selm...ngxa06.phx.gbl

search: groups.google.com
for: TypeLoadException group:microsoft.public.dotnet.languages.vc.*

"Ladvánszky Károly" <[e-mail]> wrote in message
news:ei**************@TK2MSFTNGP10.phx.gbl...

To my surprise, it has worked. I have the source files of the library in
question and struct tiff is declared.
What does this empty struct declaration do?
Could you please explain the solution a little more detailed?
Is it MC++ specific?

Thanks,

Károly
"Pent" <pent> az alábbiakat írta a következõ hírüzenetben:
e6**************@TK2MSFTNGP11.phx.gbl...

anywhere

"Ladvánszky Károly" <[e-mail]> wrote in message
news:eG**************@TK2MSFTNGP12.phx.gbl...

Thanks for your answer.
Where should I place it in MC++? Everything compiles and links with no
problem.

Károly

"Pent" <pent> az alábbiakat írta a következõ hírüzenetben:
#5*************@TK2MSFTNGP11.phx.gbl...
> it's probably forward declared as
> struct tiff;
> What you need to do in MC++ is:
> struct tiff{};
>
> "Ladvánszky Károly" <[e-mail]> wrote in message
> news:%2***************@TK2MSFTNGP09.phx.gbl...
> > I'm trying to use a statically linked C library. I've wrapped a

..NET

C++

> DLL
> > around this lib and trying to drive the wrapper from a .NET VB

testbed.

> The
> > whole build succeeds but I get the following error message at runtime: > >
> > An unhandled exception of type 'System.TypeLoadException' occurred in > > TiffLibXTester.exe
> >
> > Additional information: Could not load type tiff from assembly

TiffLibX,

> > Version=1.0.1425.19884, Culture=neutral, PublicKeyToken=null.
> >
> > I would appreciate any help on this and in general, on what the

best way

> is
> > to use legacy libraries (either lib or dll) from .NET.
> >
> > Thanks,
> >
> > Ladvánszky Károly
> >
> >
>
>