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what was I going to say again? A uint in C# has only a size of 4 bytes. Type * can not be marshaled as an unmanaged structure P: n/a the openBack I'm having a problem that I don't quite understand. Type * can not be marshaled as an unmanaged structure Conversion between managed class and unmanaged structure This type can not be marshaled as a structure field How can I know http://mediastartpage.com/cannot-be/operator-cannot-be-applied-to-operands-of-type-string-and-string-c.html

more stack exchange communities company blog Stack Exchange Inbox Reputation and Badges sign up log in tour help Tour Start here for a quick overview of the site Help Center Detailed MFC - Part I Window Tabs (WndTabs) Add-In for DevStudio SAPrefs - Netscape-like Preferences Dialog AngleSharp Comments and Discussions You must Sign In to use this message board. There are two facilities in C# to determine the size of a type - sizeof operator andMarshal.SizeOf method. While this code doesn't throw an exception and size contains 4: public enum MyEnum { V1, V2, V3 } public struct MyStruct { public MyEnum en; } int size = Marshal.SizeOf(typeof(MyStruct)); http://stackoverflow.com/questions/17879787/marshal-sizeof-throws-argumentexception-on-enums

Marshal.sizeof String

Can I get a dual entry Schengen visa for tourism purpose for me and my wife? Anyone know what it is? David "David Browne" wrote in message news:Ob**************@TK2MSFTNGP12.phx.gbl... "the openBack" wrote in message news:42***********************@news.usenetmonster. Let us say we want to allocate some memory in the unmanaged heap to call a native API (SendMessage orVirtualAlloc or ReadProcessMemory).

In a broader sense, there is one situation. more stack exchange communities company blog Stack Exchange Inbox Reputation and Badges sign up log in tour help Tour Start here for a quick overview of the site Help Center Detailed 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 Marshalas(unmanagedtype DateTime//sizeof (DateTime) L_001d: box int32 L_0022: call void [mscorlib] System.

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 ? Reference Types: The sizeof operator cannot be used on reference types. Refer MSDN for the sizes of primitive types. http://stackoverflow.com/questions/1345178/marshal-sizeof-error-in-computing-size I'm currently populating the struct by doing Marshal.GetFunctionPointerForDelegate(whatever).

asked 3 years ago viewed 1610 times active 3 years ago Related 944Why is Dictionary preferred over hashtable?147Why can't I define a default constructor for a struct in .NET?6IntPtr to Byte Structlayout 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; Why was Susan treated so unkindly? DFB vs.

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

Browse other questions tagged c# c++ .net pinvoke or ask your own question. How to use namedpipe as temporary file? Marshal.sizeof String Pardon me if I happen to ramble a bit. Marshal.sizeof C# But what if you need to give it an alias, rather than use h...

SizeOf Hello, AlexZu, you wrote:AZ> the operator C# sizeof pours out in IL the instruction sizeofTo tell the truth, never saw IL instructions sizeof. check over here Let me discuss what they offer and how they differ. How to make plots 'blacker'? Does The Amazing Lightspeed Horse work, RAW? C# Get Size Of Object

com... Linux questions C# questions ASP.NET questions fabric questions SQL questions discussionsforums All Message Boards... How do I sort files into a sub-folder based on filename part? his comment is here Pardon me if I happen to ramble a bit.

You only need to marshall types like this if you are going between the native world (Win32) and the managed world (CLR). Marshal C# The nth numerator Is the English word "ikebana" a suitable translation for "華道"? What is a size of DateTime type in C#? - A trivial question, unexcitingly facing few obstacles.

Tuesday, April 04, 2006 11:05 AM Reply | Quote Moderator 0 Sign in to vote but i want to pass the struct like this: public ref struct OutPacket{ int m_replyIndex; List^ m_mainInfos;}; if

The layout must be sequential or explicit. 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. And the expectations of Marshal.SizeOf: You can use this method when you do not have a structure. C# Sizeof 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.

Also you can always marshal it as a big byte array and sort it out after the fact. The character type used with ByValTStr is determined by the System.Runtime.InteropServices.CharSet argument of the System.Runtime.InteropServices.StructLayoutAttribute applied to the containing structure. Hence the compiler does not allow computing the size of a generic value type. weblink Should we consider the header size too and the same question applies here too - 16 bytes or the mazy data structure that the header actually refers to.

Not the answer you're looking for? Just use your type as the return type: you don't need to do any marshalling if you are going between C++/CLI and C#.     Tuesday, April 04, 2006 11:35 AM WriteLine (sizeof (DateTime));//8 Console. 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.

Recently I was needed to read context of some log file that's in use by another process when I trying to read from it. Let us enter the second half (or the better half) - Marshal.SizeOf. My intention is to send a structure for a native DLL through pInvoke but when I try to allocate memory for my structure in Managed code through Marshal it always throw Lying means deliberately telling untruth.

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