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Marshal.sizeof Cannot Be Marshaled As An Unmanaged Structure


So for such reasons, it does not make sense to determine the size of a reference type using sizeof (at least at compile time). What is this line of counties voting for the Democratic party in the 2016 elections? You'll probably need to define the Charset in your struct as well.    [StructLayout(LayoutKind.Sequential, CharSet=CharSet.Ansi)]    struct WAVEHDROther than that you can possibly use an IntPtr for lpData and Marshal methods to extract/insert Polyglot Anagrams Robbers' Thread How to decline a postdoc interview if there is some possible future collaboration?

It is possible that the size returned by sizeof and Marshal.SizeOf are different, as with the case of char. 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 How to reply? asked 3 years ago viewed 7176 times active 10 months ago Upcoming Events 2016 Community Moderator Election ends Nov 22 Get the weekly newsletter! http://stackoverflow.com/questions/17879787/marshal-sizeof-throws-argumentexception-on-enums

Marshal.sizeof String

Last edited by Grofit; August 5th, 2010 at 06:29 AM. Is adding the ‘tbl’ prefix to table names really a problem? 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.

c# .net interop share|improve this question asked Oct 16 '13 at 16:11 FusterCluck 91110 add a comment| 1 Answer 1 active oldest votes up vote 3 down vote accepted UnmanagedType.FunctionPtr requires ThreadPool.QueueUserWorkItem() could be very slow ThreadPool.QueueUserWorkItem() could be very slow if callback being executed as a work item calls Thread.Sleep() . more hot questions question feed default about us tour help blog chat data legal privacy policy work here advertising info mobile contact us feedback Technology Life / Arts Culture / Recreation Marshalas(unmanagedtype very helpful January 15, 2014 6:42 PM Post a Comment Newer Post Older Post Home Subscribe to: Post Comments (Atom) Subscribe it!

License This article, along with any associated source code and files, is licensed under The Code Project Open License (CPOL) Share email twitter facebook linkedin reddit google+ About the Author Vivek Type 'system.string' Cannot Be Marshaled As An Unmanaged Structure Alternating Fibonacci What legal documents are Italian citizens supposed to carry when traveling to Ireland? What do I do? SizeOf Programmer's Town ».NET »Problems with Marshal.

This method has two overloads - one taking the type as input and the other an instance. Structlayout DateTime//sizeof (DateTime) L_001d: box int32 L_0022: call void [mscorlib] System. What now? On 1941 Dec 7, could Japan have destroyed the Panama Canal instead of Pearl Harbor in a surprise attack?

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

Not the answer you're looking for? http://www.codeproject.com/Articles/97711/sizeof-vs-Marshal-SizeOf Safety - Improve braking power in wet conditions more hot questions question feed lang-cs about us tour help blog chat data legal privacy policy work here advertising info mobile contact us Marshal.sizeof String Wednesday, October 03, 2007 10:01 PM Reply | Quote All replies 0 Sign in to vote If it's an LPSTR you're after you should be able to get away with using Marshal.sizeof C# Auto () which says that alignment will be selected in runtime and has that objects marked LayoutKind.

What's the matter? 2 Reply by AlexZu 2006-08-07 08:47:00 AlexZu Member Offline Registered: 2003-09-13 Posts: 587 Re: Problems with Marshal. Can a text in Latin be understood by an educated Italian who never had any formal teaching of that language? Unlike sizeof (C# keyword), this one is offered from the BCL. Find the Emirps! C# Get Size Of Object

Runtime. SizeOf Hello, nikov, you wrote:AZ>> The matter is that DateTime it is marked by attribute StructLayout with type of alignment LayoutKind. And here is how runtime aligns structure in storage I.e. What is a size of DateTime type in C#? - A trivial question, unexcitingly facing few obstacles.

Usually CallingConvention.Cdecl, not the default of Stdcall. Marshal C# 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 Self-explanatory code below describes how yo...

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What do I do? Boss sends a birthday message. UPDATE Marshal.Sizeof() failed on me in this generic method: public bool IoControlReadExact(uint ioControlCode, out T output) where T : struct { output = new T(); int outBufferSize = Marshal.SizeOf(typeof(T)); IntPtr outBuffer C# Sizeof Let me discuss what they offer and how they differ.

And the error makes sense - Type cannot be marshaled as an unmanaged structure; no meaningful size or offset can be computed. Related Sites Visual Studio Visual Studio Integrate VSIP Program Microsoft .NET Microsoft Azure Connect Forums Blog Facebook LinkedIn Stack Overflow Twitter Visual Studio Events YouTube Developer Resources Code samples Documentation Downloads However,Marshal.SizeOf(SomeStruct) may report to that its char member consumes two bytes (by default) or made to take up one byte (if the StructLayout.CharSet=CharSet.Ansi). sizeof(char) is 2 since CLR is an Unicode beast.

Pardon me if I happen to ramble a bit. 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 In it, you'll get: The week's top questions and answers Important community announcements Questions that need answers see an example newsletter By subscribing, you agree to the privacy policy and terms The sizeof operator returns the size of the type in bytes as allocated by the CLR (on the current platform).

Are “la malplej juna” and “la plej maljuna” entirely interchangeable? asked 3 years ago viewed 1617 times active 3 years ago Upcoming Events 2016 Community Moderator Election ends Nov 22 Related 947Why is Dictionary preferred over hashtable?147Why can't I define a Let me discuss what they offer and how they differ.