what could be?*** solution found

[vetrikam]

hi pals,

an application developed in vb 6

when executed in another NT machine popped up with an error message like:
RunTime error: 430

class does not support automaiton or does not suport expected interface


the applicaiton is a set up developed with package and tool deployment tool

what is the reason for this error? and how to solve it

thanx in advance

this was my state

[vetrikam]

hi pals ,

above is the problem faced,

when i tried to install the setup in a non vbmachine

after a gr8 struggle v found the MDAC version was the problem


it should have the version of 2.5 or higher



so if future if u see the runtime error 430:


there is a chance of MDAC ( behind the problem)


keep working

[amitabh]

Error 430 can occur whenever a COM object is not of the required version, especially when a conflict of CLSID & IID is present between different versions.

[vetrikam]

can u help me out in realting them both

so i could catch hold of the root of the problem


does MDAC has anything to do with this CLIS ID And IID


could u plz explain me in details


thanx in advance

[amitabh]

All COM Objects, no matter where and how they are created, use the CLSID & IID. Since MDAC also contains COM component(you use ADO through these components in VB), these play a major role.
What happens is that whenever you compile a COM object, the whole prog gets a unique GUID, throuch which it is known to the OS and other applications. The classes are given CLSID and the interfaces are given IID. Now when you make some changes and your prog version number increases, the Prog GUID doesnot change( when the project is in Binary compatibility mode), but the CLSID and IID might change.
If you have an exe that uses this prog, it will call the interfaces of your COM prog, which will be broken down by the OS into GUID, CLSID and IID. If there is a change in any of this variable, it becomes a problem. But if its a case of a higher version of your prog, the OS undertsands this and gives you a message box, depending upon the setting. The problem occurs when you have a lower version. The OS then refuses to run the exe because it might break the functionality of the exe.

[vetrikam]

ur explanation was really good and useful

thanx a lot

[amitabh]