Error in StructureToPtr

[javad_2005]

[StructLayout(LayoutKind::Sequential, Pack=1, CharSet=CharSet::Ansi)] ref struct MyStruct { [MarshalAs(UnmanagedType::ByValArray, SizeConst=1024 )] array^data; }; /////////////////////// array ^Serialize(MyStruct ^Struct) { int len=Marshal::SizeOf(Struct); IntPtr ptr=Marshal::AllocHGlobal(len); array^ rawdatas = gcnew array(len); try { Marshal::StructureToPtr(Struct,ptr,false); Marshal::Copy( ptr, rawdatas, 0, len ); Marshal::FreeHGlobal( ptr ); ////////////////////////////////////////////////////////////////// return rawdatas; } catch(ArgumentException ^e) { MessageBox::Show(e->Message); } return rawdatas; } ////////////// Error in StructureToPtr: Type could not be marshaled because the length of an embedded array instance does not match the declared length in the layout.

[Mark Salsbery]

Please format your posted code in a readable and compilable  fashion!! Use the pre tags and fix the <> brackets! Mark

Mark Salsbery Microsoft MVP - Visual C++ :java:

[javad_2005]

[StructLayout(LayoutKind::Sequential, Pack=1, CharSet=CharSet::Ansi)] ref struct MyStruct { [MarshalAs(UnmanagedType::ByValArray, SizeConst=1024 )] array<Byte>^data; }; /////////////////////// array<Byte> ^Serialize(MyStruct ^Struct) { int len=Marshal::SizeOf(Struct); IntPtr ptr=Marshal::AllocHGlobal(len); array<Byte>^ rawdatas = gcnew array(len); try { Marshal::StructureToPtr(Struct,ptr,false); Marshal::Copy( ptr, rawdatas, 0, len ); Marshal::FreeHGlobal( ptr ); ////////////////////////////////////////////////////////////////// return rawdatas; } catch(ArgumentException ^e) { MessageBox::Show(e->Message); } return rawdatas; } ////////////// Error in StructureToPtr: Type could not be marshaled because the length of an embedded array instance does not match the declared length in the layout.

[Luc Pattyn]

If you add < PRE> tags as Mark suggested, I might actually look at your code... They tend to preserve indentation, making things much easier to read. :)

Luc Pattyn [Forum Guidelines] [My Articles]

---

This month's tips: - before you ask a question here, search CodeProject, then Google; - the quality and detail of your question reflects on the effectiveness of the help you are likely to get; - use PRE tags to preserve formatting when showing multi-line code snippets.

---

[Mark Salsbery]

I don't have any idea how you're actually using this code, but from the error message, is the number of elements in the data array == 1024 as specified by SizeConst? Mark

Mark Salsbery Microsoft MVP - Visual C++ :java: