Is this possible?

[mitch]

In a c# client I have the following:

double [] data = {1.0,2.0,3.0,4.0};


I have an OCX wriiten in c++ using dev studio 6.0.


Can I pass the array to the OCX? How would you do this?


I've looked and looked and failed so far. Is it possible?


Thanks,
Mitch.

 

[Nicholas Paldino [.NET/C# MVP]]

Mitch,

Yes, you can, assuming that the method on the object from the OCX is
expecting a SAFEARRAY of doubles.

Have you imported the OCX into .NET? You can easily do this by adding
it to your toolbox (there is a COM tab when you configure the toolbox).

Hope this helps.

 

[mitch]

Hello,

Thanks for your reply.

You sound condifent - like someone whose done it before? I can't.

I have successfully imported the OCX into the toolbox and have a copy
on a form.

In the .odl file I declare:

[id(3)] void UseArray([in]SAFEARRAY(double) pArray);

In the ActiveX ctl's header I declare:

afx_msg void UseArray(SAFEARRAY* pArray);

and in the ctl's dispatch map I have:

DISP_FUNCTION(CTestOCXCtrl, "UseArray", UseArray, VT_EMPTY, VTS_R8)

Is this correct? It all compiles.

In c# I have:

double [] data = {1.0,2.0,3.0,4.0};
axTestOCX1.UseArray(pArray);

And I get and Interop COMException of type mismatch.

It should be so simple. Where am I going so wrong?

Mitch.

 

[mitch]

Typo: Should read:

In c# I have:

System.Array pArray = new double[10];
axTestOCX1.UseArray(pArray);

And I get and Interop COMException of type mismatch.

It should be so simple. Where am I going so wrong?