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Specified cast is not valid exception when moved from v1.0 to v1.1

Raj
I have a c# program in which I used cast. That worked perfectly on .Net
platform 1.0. When I moved to .Net 2003, I am getting the execption
"Specified cast is not valid". I have not made any changes to the code. Is
there any difference in project settings or something else between v1.0 and
v1.1?

Thanks in advance.
--
Raj
Jul 21 '05 #1
6 1817
Raj <Ra*@discussion s.microsoft.com > wrote:
I have a c# program in which I used cast. That worked perfectly on .Net
platform 1.0. When I moved to .Net 2003, I am getting the execption
"Specified cast is not valid". I have not made any changes to the code. Is
there any difference in project settings or something else between v1.0 and
v1.1?


Could you post a short but complete program which demonstrates the
problem?

See http://www.pobox.com/~skeet/csharp/complete.html for details of
what I mean by that.

--
Jon Skeet - <sk***@pobox.co m>
http://www.pobox.com/~skeet
If replying to the group, please do not mail me too
Jul 21 '05 #2
Raj

pos = new AutoMath.DPosit ionClass();
"Jon Skeet [C# MVP]" wrote:
Raj <Ra*@discussion s.microsoft.com > wrote:
I have a c# program in which I used cast. That worked perfectly on .Net
platform 1.0. When I moved to .Net 2003, I am getting the execption
"Specified cast is not valid". I have not made any changes to the code. Is
there any difference in project settings or something else between v1.0 and
v1.1?


Could you post a short but complete program which demonstrates the
problem?

See http://www.pobox.com/~skeet/csharp/complete.html for details of
what I mean by that.

--
Jon Skeet - <sk***@pobox.co m>
http://www.pobox.com/~skeet
If replying to the group, please do not mail me too

Jul 21 '05 #3
Raj <Ra*@discussion s.microsoft.com > wrote:
pos = new AutoMath.DPosit ionClass();


In what way is that a short but complete program?

See http://www.pobox.com/~skeet/csharp/incomplete.html

--
Jon Skeet - <sk***@pobox.co m>
http://www.pobox.com/~skeet
If replying to the group, please do not mail me too
Jul 21 '05 #4
Raj
Jon,

Thanks for your reply. Here is a code snippet. It is not complete but it is
small.

IJDPosition, iLogicalDistPor t are COM interfaces defined in VC++ idl files.
DPosoition is COM class ( an ATL object ).

AutoMath.IJDPos ition pos = null;
pos = new AutoMath.DPosit ionClass();

iLogicalDistPor t.SetCenterLoca tion((NozzleEnt ities.IJDPositi on)pos); //This
throws Specified cast in not valid exception.

Why cast is needed :
The iLogicalDistPor t is in defined in the idl file of
NozzleEntities VC++ project. Following is the idl file:

import "AutoMath.i dl";

interface IJLogicalDistPo rt : IDispatch
{
[id(2), helpstring("met hod GetCenterLocati on")] HRESULT
GetCenterLocati on([out,retval] IJDPosition ** ppPosition);
[id(4), helpstring("met hod SetCenterLocati on")] HRESULT
SetCenterLocati on([in] IJDPosition * pPostion);
};

library NozzleEntities
{
coclass DistribPorts
{
[default] interface IDispatch;
interface IJLogicalDistPo rt;
};
}

Since the object is in the type library of NozzleEntities, the method is
expecting NozzleEntities. IJDPosition as argument.

I can only create AutoMath.DPosit ionClass(), since that is where my
DPosition class is implemented.

I hope the scenario is clear. If not I can provide more details. Basically
I am creating an unmanaged object and calling a method on it in managed code.

My main question is, this used to work in v1.0. I haven't make any changes
except moving to v1.1. Now I get the exception. Is there any known problem
or known solution for this problem.

Thanks,
Raj

"Jon Skeet [C# MVP]" wrote:
Raj <Ra*@discussion s.microsoft.com > wrote:
I have a c# program in which I used cast. That worked perfectly on .Net
platform 1.0. When I moved to .Net 2003, I am getting the execption
"Specified cast is not valid". I have not made any changes to the code. Is
there any difference in project settings or something else between v1.0 and
v1.1?


Could you post a short but complete program which demonstrates the
problem?

See http://www.pobox.com/~skeet/csharp/complete.html for details of
what I mean by that.

--
Jon Skeet - <sk***@pobox.co m>
http://www.pobox.com/~skeet
If replying to the group, please do not mail me too

Jul 21 '05 #5
Raj <Ra*@discussion s.microsoft.com > wrote:
Thanks for your reply. Here is a code snippet. It is not complete but it is
small.


Unfortunately, that still doesn't really help me, as I still can't
reproduce the problem.

Given that it's COM stuff though, I suggest you ask in the interop
group - you're more likely to get an answer there. (I'm not
particularly hot on interop, I'm afraid.)

--
Jon Skeet - <sk***@pobox.co m>
http://www.pobox.com/~skeet
If replying to the group, please do not mail me too
Jul 21 '05 #6
Raj
Thanks for your suggestion Jon,
I will try interop.

Raj

"Jon Skeet [C# MVP]" wrote:
Raj <Ra*@discussion s.microsoft.com > wrote:
Thanks for your reply. Here is a code snippet. It is not complete but it is
small.


Unfortunately, that still doesn't really help me, as I still can't
reproduce the problem.

Given that it's COM stuff though, I suggest you ask in the interop
group - you're more likely to get an answer there. (I'm not
particularly hot on interop, I'm afraid.)

--
Jon Skeet - <sk***@pobox.co m>
http://www.pobox.com/~skeet
If replying to the group, please do not mail me too

Jul 21 '05 #7

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