Re: InvalidCastException for interface - C# Discussion Boards

Colin Angus Mackay15-Aug-07 4:19

Colin Angus Mackay

15-Aug-07 4:19

lankaudaranga wrote:
c#

Gosh! That's an excellent subject for a post in the C# forum. I would never have guessed that the post might possibly have anything at all to do with C#.

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Scott Dorman15-Aug-07 4:21

Scott Dorman

15-Aug-07 4:21

Nice.

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Justin Perez15-Aug-07 4:22

Justin Perez

15-Aug-07 4:22

Whyis it that almost every incorrectly placed, wrong titled, and ridiclous question comes with "Location India" in the profile? Mad | :mad:

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Bert delaVega15-Aug-07 5:39

Bert delaVega

15-Aug-07 5:39

American companies should use these forums as a case study to forecast what things will be like before they convince themselves that outsourcing is such a great idea! Laugh | :laugh:

InvalidCastException for interface

Justin Perez15-Aug-07 5:43

Justin Perez

15-Aug-07 5:43

They should do that, but it will hurt us american developers too. They will see what we do here at CP during the "Research time" that will bill them for Smile | :)

I get all the news I need from the weather report - Paul Simon (from "The Only Living Boy in New York")

__DanC__15-Aug-07 3:54

__DanC__

15-Aug-07 3:54

I have two assemblies which both contain a definition for a specific interface, unfortunately these definitions differ in that some of the function signatures require different type like:

SomeFunction(IntPtr param1, int param2);

and

SomeFunction(MyClass param1, MyEnum param2);

(Obviously not the real function and class names)

When I try to bind to the interface from the other assembly I get an InvalidCastException even though they are both defined with the same GUID.

Is there any way I can get this to work without changing the signatures as this causes a lot of issues in the rest of the project (Both parts not mine BTW).

Thanks.

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Re: InvalidCastException for interface

Justin Perez15-Aug-07 3:57

Justin Perez

15-Aug-07 3:57

Have you tried casting to the required type?

I get all the news I need from the weather report - Paul Simon (from "The Only Living Boy in New York")

Re: InvalidCastException for interface

Scott Dorman15-Aug-07 4:14

Scott Dorman

15-Aug-07 4:14

So you have an interface that looks like this:

public interface IMyFunctions
{
   SomeFunction(IntPtr param1, int param2);
   SomeFunction(MyClass param1, MyEnum param2);
}

which is defined in assembly Interfaces.dll?

In some other assembly you have a class that looks like

public class SomeClass : IMyFunction
{
   SomeFunction(IntPtr param1, int param2) { ... };
   SomeFunction(MyClass param1, MyEnum param2) { ... };
}

Assuming that the above is reasonably correct to your implementation, you get an InvalidCastException when you try to do what?

What do you mean "they are defined with the same GUID"? There are no GUIDs that you can set that have any kind of impact on the compiler and runtime behavior.

Have you stepped through the code with a debugger attached to see where the exception is actually ocurring? That should give you a better idea of what is going wrong.

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Re: InvalidCastException for interface

__DanC__15-Aug-07 4:43

__DanC__

15-Aug-07 4:43

I should have been more clear. The interface is IShellFolder, it is defined in both assemblies as a ComImport

[ComImport, Guid("000214E6-0000-0000-C000-000000000046"),<br />
    InterfaceType(ComInterfaceType.InterfaceIsIUnknown)]

The problem is the the signatures are different, for example:

<br />
int BindToObject(IntPtr pidl, [In] IntPtr pbc, [In] ref Guid riid, [Out] out IntPtr ppv);<br />

and

<br />
int BindToObject(IntPtr pidl, [In] IntPtr pbc, [In] ref Guid riid, [Out, MarshalAs(UnmanagedType.Interface)] out IShellFolder ppv);<br />

When I call IShellFolder.BindToObject on from one assembly to the other I get a valid IntPtr but when I cast it using Marshal.GetObjectForIUnknown I get an error saying "Specified cast is not valid"

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Video/Picture Control [modified]

kibromg15-Aug-07 3:32

kibromg

15-Aug-07 3:32

Hi all,

I would like to have a control that can be binded either to *.Jpg for a picture or *.mpeg for a video content.

Can you please help me get which control i have to use to accopmlish this task?

Is there any control on the default microsoft Toolbox?

Thanks very much.

-- modified at 9:39 Wednesday 15th August, 2007

Judah Gabriel Himango15-Aug-07 4:28

Judah Gabriel Himango

15-Aug-07 4:28

You can use the WebBrowser control which can display pictures natively or embed WMP in the HTML to play video.

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kibromg15-Aug-07 4:50

kibromg

15-Aug-07 4:50

Thank you very much for your time.

Sorry can i get this control on the default C sharp or Asp.net Developent toolbox?
If not where can i find it?How would i include it in to my page?

I am using C sharp and Asp.net for reporting application.

Thanks for you time.

Judah Gabriel Himango15-Aug-07 5:13

Judah Gabriel Himango

15-Aug-07 5:13

The WebBrowser control is for the Windows Forms toolkit (e.g. C# desktop app development). I don't know ASP.NET well enough to tell you whether there's such a control. Probably not. My guess is you could simply have some logic that created an <img> tag for images, and otherwise used Flash or Windows Media Player for video.

Tech, life, family, faith: Give me a visit.
I'm currently blogging about: Just F-ing Do It Smile | :)
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kibromg15-Aug-07 7:27

kibromg

15-Aug-07 7:27

Thanks very much once again,

How will i get the Window Media player in to the toolbox?
sorry i havent used it before?
Can you please get me the steps in getting the media player on to My ASP page?

Thanks

problem with source safe bindings in visual studio

pbraun15-Aug-07 12:57

pbraun

15-Aug-07 12:57

This question is better posed in the ASP.NET message board.

Phil

blakey40415-Aug-07 3:23

blakey404

15-Aug-07 3:23

i know its naughty but nobody looks at the visual studio message board...

someone out there must have had this problem before!

http://www.codeproject.com/script/comments/forums.asp?msg=2183009&forumid=3831#xx2183009xx[^]

many thanks

C# toolbar

kkosala15-Aug-07 2:59

kkosala

15-Aug-07 2:59

how to save , edit,querry a database using C# toolbar

Re: C# toolbar

Judah Gabriel Himango15-Aug-07 4:27

Judah Gabriel Himango

15-Aug-07 4:27

What's C# toolbar? Is this something you designed?

Tech, life, family, faith: Give me a visit.
I'm currently blogging about: Just F-ing Do It Smile | :)
The apostle Paul, modernly speaking: Epistles of Paul

Judah Himango

How I can Convert the Language Type

Thaer Hamael15-Aug-07 2:53

Thaer Hamael

15-Aug-07 2:53

hi all
how i can convert the language (English to Arabic) When i Leave the TextBox1 to TextBox2 The Convert just in text language as
TextBox1 is write in English language and the TextBox2 is Write by Arabic Language
thanks for all body hellp me

Thaer

Giorgi Dalakishvili15-Aug-07 3:02

Giorgi Dalakishvili

15-Aug-07 3:02

First you will need to catch textbox2 enter event. In that event you can change input language. Then set input language using InputLanguage Class

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Thaer Hamael15-Aug-07 3:10

Thaer Hamael

15-Aug-07 3:10

thanks Mr Giorgi Dalakishvili
but your answer is not Complete my Quesion
Pleas if you have Code To ny Quesion Give me it
thanks Mr

Thaer

leckey15-Aug-07 3:12

leckey

15-Aug-07 3:12

First, you have asked this question before. Second, this forum is for people who are having issues with existing code. Asking someone to just hand over the code so you don't have to work on it is considered RUDE.

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Giorgi Dalakishvili15-Aug-07 3:12

Giorgi Dalakishvili

15-Aug-07 3:12

No one is going to give you complete code here. I gave you directions and you can explore them. If you are stuck at a specific point please say so and I'll be happy to help you Smile | :)

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