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Cannot Use Sizeparamindex For Byref Array Parameters

The only difference is that you cannot resize a static array. Ideally, I would like > > to > > > > > avoid using StringBuilder, since I have to wrap hundreds of similar > C > > > > > functions. Thomas, Try it like this [PreserveSig] int Next( int cPins, [Out, MarshalAs(UnmanagedType.LPArray, SizeParamIndex=0)] IPin[] ppPins, out int pcFetched ); Mattias === Mattias Sjögren [email protected] You can read messages from the Advanced If the function returns False, the array is static, and we would probably raise an error or just exit the sub. weblink

c method __declspec(dllexport) int someMethod ( size_t *foo, int **bar ) { *foo = 10; **bar = 10; } My c# code [DllImport(@"my.dll", CallingConvention = CallingConvention.Cdecl, SetLastError = true, BestFitMapping = Privacy statement Dev Centers Windows Office More... Related 1854Cast int to enum in C#361unsigned int vs. Code Snippet [StructLayout(LayoutKind.Sequential, CharSet=CharSet.Ansi)] internal struct SID_SEARCH_RESULT_DATA { public uint ulFieldID; public ushort usFieldLength; [MarshalAs(UnmanagedType.ByValTStr, SizeConst=FIELD_LENGTH)] public char szFieldData[FIELD_LENGTH]; } You can then pass an array of these objects to unmanaged https://social.msdn.microsoft.com/Forums/vstudio/en-US/7b35fe28-199c-4204-ad62-ebb25a381553/passing-by-reference-to-c-dll-problem?forum=csharpgeneral

My AccountSearchMapsYouTubePlayNewsGmailDriveCalendarGoogle+TranslatePhotosMoreShoppingWalletFinanceDocsBooksBloggerContactsHangoutsEven more from GoogleSign inHidden fieldsSearch for groups or messages Very Computer Board index DotNet How do I marshal array of strings passed by ref? This avoids calling Redim ' Preserve for each cell in the range. ' ' It calls IsArrayDynamic to ensure that Arr ' is a dynamic array that can be resized. '''''''''''''''''''''''''''''''''''''''''''''''''' You cannot declare the array in the parameter list of the called procedure As Variant() to accept any data type array. Pass BYTE array from COM DLL to C# 7.

We'll use ReDim ' in the called procedure to change the size. For example, the following code passes a static array to a function.Sub AAATest() Dim StaticArray(1 To 3) As Long Dim Result As Long StaticArray(1) = 10 StaticArray(2) = 20 StaticArray(3) = The same rules apply: the array receiving the result must be a dynamic array and must have the same data type as the returned array. Still, IMHO, our product will be superior then, becaue I plan to move the way of fully integrating with SQL Server YUKON, while MS propably goes the "generic" way. ##### I

Thanks so much. Previous Message by Thread: Re: FW: Interop: Handling OUT parameter of array, gets error "Can not use SizeParamIndex for byref array parameters."?? The arrays are fixed size and the c++ side doesn't allocate any memory, it just does calculations on the inputted values. http://stackoverflow.com/questions/16010944/int-in-c-and-int-in-c-sharp-is-same I don't remember it been a long time since I used memcpy().

Sub AAATest() Dim DynArray() As Double ' Note that this array is not sized ' in the Dim statement. COM interop; vb dll - array - c# - reads only 1 element 6. On return, the array is been resized to 1." I am trying to wrap a C function: extern "C" __declspec(dllexport) int crtFunc( char** variations[] , long* count); [assume all the strings Bibliographic informationTitleExpert F# 3.0Apressus SeriesExpert's voice in F#SpringerLink : BücherAuthorsDon Syme, Adam Granicz, Antonio CisterninoEdition3, illustratedPublisherApress, 2012ISBN1430246502, 9781430246503Length650 pagesSubjectsComputers›Programming›MicrosoftComputers / Programming / MicrosoftComputers / Software Development & Engineering / General  Export CitationBiBTeXEndNoteRefManAbout

  • The problem is that the OP uses double ** rather than double *.
  • It then gens a fully SqlParamater(ized), subclassed, ICloneable SqlCommand object for each one.
  • For example, how would SumArray be written to handle arrays of Integers or Doubles as well as Longs?
  • Note that in your example you are assigning the index to MAX_RESULTS which wouldn't be right.
  • Build me a Brick Wall!

I have changed it to be the index of the max size variable in the parameter list. other If you would like to call some methods in a unmanaged dll in C#, you need to consider using interop method.   Regards,   Friday, October 05, 2007 9:41 AM Reply | In general, it seems that this needs byte everywhere there is char currently. –Pavel Minaev Dec 7 '09 at 18:25 @Jon: thanks! @Pavel: no, it's the number of elements by Ming.Che » Sat, 01 Sep 2012 08:12:33 1.

Or maybe they'll scrap it all together and do other form of XML/XSD-base serialization to Yukon. have a peek at these guys Generally you tell the marshaller how many elements to return back through a parameter like so: Code Snippet private static extern void SomeUnmanagedCode ( [MarshalAs(UnmanagedType.LPArray, SizeParamIndex=1)] ref SID_SEARCH_RESULT_DATA[] data, ref int Thanks Top How do I marshal array of strings passed by ref? And a schema syncrhonisation tool will be able to genereate the ddatabase model from the embedded schema :-) ##### I appreciate both those comments, but in general I like the way

At least I'm moving towards the right direction.KathyL Both output and input should pointers. This page assumes you are familiar with the fundamentals of VBA arrays and the difference between a static and a dynamic array. The first thing to understand is that arrays are always passed by reference (ByRef). check over here He has over six years of experience applying F# in commercial projects, and works on WebSharper, IntelliFactory's web development platform that offers unrivaled productivity, a uniform programming model based on F#,

What am I missing The ref keywords are required to get the array writable on the C++ dll side, but it won't run in it's current format if they are. Oktober 2002 16:04 > An: [email protected] > Betreff: Re: [ADVANCED-DOTNET] Is code running under a service? > > Not necessarily if that one returns true if the service is allowed to I have been getting some very odd behavior though - ExecutionEngineExceptions and other random exceptions (even exceptions which claim I am unable to write to the EventLog, which is patently false).

If I leave the 'ref' keyword in, I get a runtime error : "Cannot marshal 'parameter #1': Cannot use SizeParamIndex for ByRef array parameters." when the exported method is called.

On the Functions For VBA Arrays page, there is a function named NumberOfArrayDimensions that will return the number of dimensions of an array. (It returns 0 for unallocated dynamic arrays). by boban. » Tue, 28 Aug 2012 03:07:28 Try with something like this: public const int FIELD_LENGTH = 11; //length of filed is 10 for example, so length of char array You show a C++ function with 2 parameters, and a C# with 4, that simply won't work. "The arrays are fixed size and the c++ side doesn't allocate any memory, it The iResults value appears to return correctly.

I don't include the ByRef keyword for variables whose content I am not going to modify. I would change the method declaration to be: ... // Eliminate PreserveSig unless you need to interpret the HRESULT ///

/// The Next method retrieves a specified number of pins Instead, declare it as a Variant (not an array of Variants). this content Hope this works (and helps)! -Andy Hopper -----Original Message----- From: Moderated discussion of advanced .NET topics. [mailto:[email protected]] On Behalf Of Thomas Tomiczek Sent: Monday, October 14, 2002 6:49 AM To: [email protected]

The short answer is that the same rules and techniques that apply to single-dimensional arrays apply to multi-dimensional arrays. I'm not sure how the unmanaged array can be deallocated. by Lee_66 » Thu, 06 Sep 2012 12:16:37 Think I got it! You can also try removing the ref option.

But, I am not sure. Passing Arrays To Procedures A procedure (a Sub, Function or Property) can accept an array as an input parameter. more hot questions question feed lang-cs about us tour help blog chat data legal privacy policy work here advertising info mobile contact us feedback Technology Life / Arts Culture / Recreation by Ming.Che » Sun, 02 Sep 2012 10:14:35 I just took another look at your C side func signature and I think you need to first clarify how you want the

The code doesn't test whether the array is dynamic and therefore can be resized. I tend be fairly agnostic other than having a desire to have the entire layer driven off an XSD repository (an DLL version of XSD would be handy...). For example, Sub AAATest() '''''''''''''''''''''''' ' Dynamic array to hold ' the result. '''''''''''''''''''''''' Dim ReturnArr() As Long Dim Ndx1 As Long Dim Ndx2 As Long Dim NumDims As Long ''''''''''''''''''''''''''

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