Fix Argumentexception Type Cannot Be Marshaled As An Unmanaged Structure (Solved)

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Argumentexception Type Cannot Be Marshaled As An Unmanaged Structure


create and initialize the native representation yourself. Is adding the ‘tbl’ prefix to table names really a problem? 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 Search Comments Spacing RelaxedCompactTight Layout NormalOpen TopicsOpen AllThread View Per page 102550 First Prev Next Using CustomMarshaller schlingel00177-Feb-13 23:56 schlingel00177-Feb-13 23:56 When I use a custom marshaller (implements ICustomMarshaller)

Unlike sizeof (C# keyword), this one is offered from the BCL. Type 'System.String' cannot be marshaled as an unmanaged structure; no meaningful size or offset can be computed. And the expectations of Marshal.SizeOf: You can use this method when you do not have a structure. In a broader sense, there is one situation.

Marshal.sizeof String

Does that mean we don't need to compute the size of a type at all when working in the CLR world? I'm having a problem that I don't quite understand. If I bypass that line of code, the report generates just fine. Post your question and get tips & solutions from a community of 418,747 IT Pros & Developers.

I just saw this bird outside my apartment. WriteLine (Marshal. Can anyone help? Marshalas(unmanagedtype Marshal.SizeOf(char) will return 1 since a char in the unmanaged world takes up one byte.

If Systems-C# is ever released, it might be a better choice, but that's not ready yet. Auto () which says that alignment will be selected in runtime and has that objects marked LayoutKind. THANKS! The struct is not a generic value type.sizeof should be imagined as a compile-time construct.

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 Structlayout SizeOf Hello, AlexZu, you wrote:AZ> The matter is that DateTime it is marked by attribute StructLayout with type of alignment LayoutKind. If you read the documentation for Marshal.SizeOf, it specifically says Returns the size of an unmanaged type in bytes. The compiler didn't complain about enum not being a struct –Wouter Huysentruit Jul 26 '13 at 11:37 1 where T : struct does not mean T has to be struct.

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

List mainInfos = outPacket.m_mainInfos;---------------then i got the error:  cannot 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 I think currentLimit can't be converted to 8 bytes in memory, that is why you get an error. [MarshalAsAttribute(UnmanagedType.I8)] public uint currentLimit; I8 is for signed 8 byte integer. Marshal.sizeof String c# c++ .net pinvoke share|improve this question edited Oct 11 '13 at 12:18 Agustin Meriles 3,68321636 asked Oct 11 '13 at 11:54 nishantcop 430416 1 Why c++ tag..? –Soner Gönül Marshal.sizeof C# 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;

I was sure that this attribute reorders struct fields and then compiles it, but it doesn't. Value Types: User-defined value (and reference types) are composed of the primitive value types exposed by the compiler, most of which exist as keywords – int, bool, char, long, double etc. Marshalling is used for interop - and when doing interop, the two sides have to agree exactly on the structure of the struct. Making a large file using the terminal How can tilting a N64 cartridge cause such subtle glitches? C# Get Size Of Object

The layout must be sequential or explicit. Reference Types: The sizeof operator cannot be used on reference types. A uint in C# has only a size of 4 bytes. Reference types are basically (C++) pointer like.

Why did the best potions master have greasy hair? Marshal C# Borders table Latex What is the origin of the word "pilko"? The point of Marshal.SizeOf is to give you the size of the structure when marshalled for unmanaged/native interop.

Let me discuss what they offer and how they differ.

Besides, the subtle and bitter thing is that the size depends on other factors such as the pack size used (StructLayout.Pack) or character set (StructLayout.CharSet) applied on the type definition or SizeOf Programmer's Town ».NET »Problems with Marshal. Abdul Khaliq c# marshalling structure sizeof share|improve this question asked Aug 28 '09 at 5:28 Abdul Khaliq 96092657 Show us the attribute with your struct. –AVD Aug 28 '09 C# Sizeof If you wish to pass it to Win32 then you can't have the system do it automatically instead you are going to have to do it manually - i.e.

SOLUTION I could refactor my generic method to make it work for both struct and enum: // determine the correct output type: Type outputType = typeof(T).IsEnum ? share|improve this answer edited Oct 11 '13 at 13:02 answered Oct 11 '13 at 12:25 Sriram Sakthivel 51.7k34394 Right, or make it ulong. –Hans Passant Oct 11 '13 at What is the origin of the word "pilko"? check my blog Linked 6 C# sizeof(enum) alternative? (to workaround resharper false error)?

AutoN> And what then the operator sizeof works???Marshal. Enum.GetUnderlyingType(typeof(T)) : typeof(T); //... You only need to marshall types like this if you are going between the native world (Win32) and the managed world (CLR). Do students wear muggle clothing while not in classes at Hogwarts (like they do in the films)?