.Net function call problem

[slemieux]

Hi!

I'm calling an .net object created by DotNetCoCreateObject. The object is successfully created, but when I call one of its public methods, I get an "The parameter is incorrect." error.

Here is my code:

set oObj = DotNetCoCreateObject (SUPPORTDIR ^ "SetupDBHelper.dll", "SetupDBHelper.SqlServerHelper","");
nResult = oObj.Ping(sLogRepositoryConnString);

Any idea of what could be the problem?

[ChristopheOce]

Hi,

I'm a beginner with installshield, but for your problem have you declare the prototype of the function dot net you want to use => who is : SetupDBHelper.SqlServerHelper ?

If not, here is it a sample :

prototype TypeOfReturn SetupDBHelper.SqlServerHelper(YourParameter1, yourParameter2, ...);

Have a nice day
Christophe

[Christopher_Pai]

You probably want to replace SUPPORTDIR with a call to MsiGetProperty to get the SUPPORTDIR directory property.

Otherwise you seem to have the right concept. In your .NET code, declarate your class as ComVisible(true) and instantiate it by using the NameSpace.Class like you show. You might also want to use some try catch blocks cause if you try to invoke a member on an object that isn't valid, kaboom.

Btw my blog has lots of examples in this area.