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I don't understand the marshalling very well, so this is kind of stumping me. The ArraySubType field can optionally contain the UnmanagedType of the array elements when it is necessary to differentiate among string types. Runtime. Browse other questions tagged c# .net enums marshalling or ask your own question. check over here

If you need to do memory profiling, use a memory profiler, not Marshal.SizeOf. –Luaan Aug 6 '15 at 14:13 1 @AlexZhukovskiy The point is, really, if you need deterministic memory David Jul 21 '05 #4 P: n/a the openBack Mattias Sj÷gren wrote: [MarshalAs(UnmanagedType.ByValArray, SizeConst=Kernel.MAX_PATH)]public string szDisplayName; Change ByValArray to ByValTStr. Join them; it only takes a minute: Sign up Marshal.SizeOf error in computing size up vote 1 down vote favorite 1 i have a structure public struct SERVER_USB_DEVICE { USB_HWID usbHWID; Console:: WriteLine (string, object) L_0027: nop L_0028: ret Posts [ 7 ] Pages 1 You must login or register to post a reply Programmer's Town ┬╗.NET ┬╗Problems with Marshal. check these guys out

Marshal.sizeof String

What should I do when the boss "pulls rank" to get their problems solved over our customers' problems? It is allowed to be used with reference types only if the type layout is specified to be LayoutKind.Sequential or LayoutKind.Explicit; else the same exception above will be thrown at runtime. lowercase breadcrumbs 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 Obviously no, else I would not be writing this post.

Got any clue? Copyright Quinstreet Inc. 2002-2016 Skip to forum content Programmer's Town Welcome to the Programmer's Town community forums. It is a property in the underlying bytecode metadata. –Sam Harwell Jul 26 '13 at 12:39 Note that the following code is valid (even outside unsafe context) and gives Marshalas(unmanagedtype Application Lifecycle> Running a Business Sales / Marketing Collaboration / Beta Testing Work Issues Design and Architecture ASP.NET JavaScript C / C++ / MFC> ATL / WTL / STL Managed C++/CLI

Marshal.SizeOf(char) will return 1 since a char in the unmanaged world takes up one byte. If the runtime / compiler wanted, it could make every byte 77 bytes long, and it wouldn't break any contract whatsoever as long as it only stores values from 0 to If I receive written permission to use content from a paper without citing, is it plagiarism? http://stackoverflow.com/questions/19317529/marshal-sizeofstrurturetype-always-throws-error try changing it to U4 or I4. [MarshalAsAttribute(UnmanagedType.U4)] public uint currentLimit; Or change type of currentLimit to ulong as @Hans Passant suggested. [MarshalAsAttribute(UnmanagedType.I8)] //or U8 public ulong currentLimit; this works.

Marshal just was incompetent. –usr Jul 26 '13 at 11:29 add a comment| 2 Answers 2 active oldest votes up vote 24 down vote accepted This appears to be a limitation Structlayout Word for "using technology inappropriately"? Depalindromize this string! The 10'000 year skyscraper Is it safe to use cheap USB data cables?

Type 'system.string' Cannot Be Marshaled As An Unmanaged Structure

SizeOf Hello, nikov, you wrote:AZ>> The matter is that DateTime it is marked by attribute StructLayout with type of alignment LayoutKind. https://social.msdn.microsoft.com/Forums/vstudio/en-US/0ca73990-0be1-4311-ae46-f689f4c6caf7/error-aboutcannot-be-marshaled-as-an-unmanaged-structure?forum=vcgeneral List mainInfos = outPacket.m_mainInfos;---------------then i got the error: ┬ácannot convert from 'System.Collections.Generic.List' to 'System.Collections.Generic.List' Tuesday, April 04, 2006 12:57 PM Reply | Quote 0 Sign in to vote If the types Marshal.sizeof String Jul 21 '05 #2 P: n/a David Browne "the openBack" wrote in message news:42***********************@news.usenetmonster. Marshal.sizeof C# It's a constraint to demand a value-type. –Henk Holterman Jul 26 '13 at 11:41 Oh you are right, a enum is a managed struct, but this method wants a

Advanced Search Forum C# Programming C-Sharp Programming [RESOLVED] Error marshalling pointer to struct with char[] If this is your first visit, be sure to check out the FAQ by clicking the Reply With Quote August 5th, 2010,09:48 AM #2 Grofit View Profile View Forum Posts Member Join Date Nov 2006 Posts 357 Re: Error marshalling pointer to struct with char[] Just a SizeOf At attempt to define the size occupied with structure DateTime, ran into an exception:using System; using System. If you wish to pass an instance to C# then you don't need to do anything as C# will understand the definition of the type. C# Get Size Of Object

Change the attribute to UnmangedType.U4. –Hans Oct 11 '13 at 12:23 add a comment| 1 Answer 1 active oldest votes up vote 2 down vote accepted uint is actually alias for The point of Marshal.SizeOf is to give you the size of the structure when marshalled for unmanaged/native interop. But that doesn't really matter - even if it were the C# compiler, it would still mean the type would be dangerous and useless for unmanaged interop. –Luaan Aug 6 '15 this content Forum New Posts FAQ Calendar Forum Actions Mark Forums Read Quick Links Today's Posts View Site Leaders What's New?

SizeOf Hello, nikov, you wrote:N> Hello, AlexZu, you wrote:AZ>> the operator C# sizeof pours out in IL the instruction sizeofN> To tell the truth, never saw IL instructions sizeof.N> Dizassembler always Marshal C# For example, the managed application might want to allocate unmanaged memory for creating\filling a data structure for calling a native API, which takes the data structure as its input or would It simply marks the struct as "auto-layouted", and it's done.

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I'm having a problem that I don't quite understand. Is it possible to write division equation in more rows? When we say sizeof(GenValueType), the (closed) type definition GenValueType is not available at compile time but only at runtime. C# Sizeof Sign in using Search within: Articles Quick Answers Messages home articles Chapters and Sections> Search Latest Articles Latest Tips/Tricks Top Articles Beginner Articles Technical Blogs Posting/Update Guidelines Article Help Forum Article

Results 1 to 3 of 3 Thread: [RESOLVED] Error marshalling pointer to struct with char[] Tweet Thread Tools Show Printable Version Email this Page… Subscribe to this Thread… Display Linear Mode Marshalling is used for interop - and when doing interop, the two sides have to agree exactly on the structure of the struct. Anyone know what it is? Newton's second law for individual forces Why was Susan treated so unkindly?

always showed that sizeof it is replaced with literal whole value at a compilation stage. 6 Reply by AlexZu 2006-08-07 10:59:00 AlexZu Member Offline Registered: 2003-09-13 Posts: 587 Re: Problems with What is the total sum of the cardinalities of all subsets of a set? Can I get a dual entry Schengen visa for tourism purpose for me and my wife? DateTime ' cannot be marshaled as an unmanaged structure; no meaningful size or offset can be computed.at System.Runtime.InteropServices.Marshal.SizeOf (Type t)at Program.

If you choose to participate, the online survey will be presented to you when you leave the Msdn Web site.Would you like to participate? What is the origin of the word "pilko"? If you wish to pass an instance to C# then you don't need to do anything as C# will understand the definition of the type. My manager said I spend too much time on Stack Exchange.

Always use the MarshalAsAttribute.SizeConst field to indicate the size of the array. [StructLayout(LayoutKind.Sequential, CharSet = CharSet.Unicode)] // OR [StructLayout(LayoutKind.Sequential, CharSet = CharSet.Ansi)] public struct SERVER_USB_DEVICE { USB_HWID usbHWID; byte status; bool Not a compiler. DFB vs. Refer MSDN for the sizes of primitive types.