That is how the function definition appears in the inteop assembly that VS creates from an ActiveX library.
Jeff K. Steinkamp N7YG Tucson, AZ SCUD Missile Coordinates: N032-13-55.02 W110-55-52.79 Registered Linux User: 420428 ------------------------------------------------------ Tov Mallorn - The Googooplex Names of Tom Servo! From: Charles A. Lopez Sent: Wednesday, January 05, 2011 16:57 To: [email protected] Subject: Re: [DotNetDevelopment] Marshel array of integers to C++ ActiveX method who wrote: Public Overridable Function ReadFFT(ByRef pArray As Integer, ByVal wCount As Short) As Short ? On 4 January 2011 08:44, Jeff Steinkamp (N7YG) <[email protected]> wrote: Nope. Tried that and others to get the address of the array and I ether get, “This applications has quite working” without anything bubbling up though the debugger, or and error that says we are trying to address protected memory. Jeff K. Steinkamp N7YG Tucson, AZ SCUD Missile Coordinates: N032-13-55.02 W110-55-52.79 Registered Linux User: 420428 ------------------------------------------------------ Give thanks to the Lord, for he is good! From: Arsalan Tamiz Sent: Monday, January 03, 2011 23:42 To: [email protected] Subject: Re: [DotNetDevelopment] Marshel array of integers to C++ ActiveX method Reading the parameter name which is pArray, it seems that the whole array should be passed. Have you tried passing the address of array? Maybe the declaration of API method is also NOT valid. Anyways to get the address of a variable, you case System.Runtime.InteropServices namespace and can use GCHandle class. Example: Dim a() As Integer = {5, 6, 4, 10} Dim gh As GCHandle = System.Runtime.InteropServices.GCHandle.Alloc(a, GCHandleType.Pinned) Dim i As IntPtr = gh.AddrOfPinnedObject() Debug.Print(i.ToInt32()) ' <--- getting address of array gh.Free() On Mon, Jan 3, 2011 at 5:52 PM, Jeff Steinkamp (N7YG) <[email protected]> wrote: The reference to parray is an array of 2048 integers that represents FFT data. I’m trying to get those from the ActiveX control into my program so I can manipulate them for further processing Jeff K. Steinkamp N7YG Tucson, AZ SCUD Missile Coordinates: N032-13-55.02 W110-55-52.79 Registered Linux User: 420428 ------------------------------------------------------ Small white pigeons mysteriously appeared in people's clothing. From: Charles A. Lopez Sent: Sunday, January 02, 2011 22:47 To: [email protected] Subject: Re: [DotNetDevelopment] Marshel array of integers to C++ ActiveX method What are you trying to do? On 1 January 2011 01:41, Jeff Steinkamp (N7YG) <[email protected]> wrote: I have an ActiveX library that was built using C++ with the following method: � Public Overridable Function ReadFFT(ByRef pArray As Integer, ByVal wCount As Short) As Short � I can dissemble the Interop files created and the declaration is ReadFFT(int32&, int16) � I assumed you could write the following and it would work: � dim ar(2047) as int32 myActiveXLib.ReadFFT(ar(0),arr.length) � But the CLR croaks with some cryptic messages about MDR � � How do you marshal this into the unmanaged ActiveX world? � � Jeff K. Steinkamp N7YG Tucson, AZ SCUD Missile Coordinates: N032-13-55.02 W110-55-52.79 Registered Linux User: 420428 ------------------------------------------------------ Orville Bullitt - Mouth is in gear, brain is in neutral. -- Charles A. Lopez [email protected] -- Charles A. Lopez [email protected] What's your vision for your organization? What's your biggest challenge? Let's talk. (IBM Partner)
