I'm trying to set up a structure using unions (fieldoffset) and I'm running
into a problem. When I try to setup a union of data array or
message type, I get the following error:
System.TypeLoad Exception: Could not load type 'Test.Message' from assembly
'Test, Version=1.0.222 8.19435, Culture=neutral , PublicKeyToken= null' because
it contains an object field at offset 1 that is incorrectly aligned or
overlapped by a non-object field.
WHY?
<StructLayout(L ayoutKind.Expli cit)> _
Public Structure R_OMNI_LINK_MES SAGE
<FieldOffset(0) > Public MessageLength As Byte
' ....... THIS ONE DOESN'T WORK!!.... Throws Error
<FieldOffset(1) , MarshalAs(Unman agedType.ByValA rray, SizeConst:=255) > Public
Data() As Byte
'.............. ............... ............... ............... ............... .....
<FieldOffset(1) > Public MessageType As Byte
<FieldOffset(2) > Public NAME_DATA As olmNAME_DATA ' 8bit / 16bit
<FieldOffset(2) > Public EVENT_LOG_DATA As olmEVENT_LOG_DA TA
<FieldOffset(2) > Public COMMAND_MESSAGE As olmCOMMAND_MESS AGE
<FieldOffset(2) > Public SET_TIME As olmSET_TIME
<FieldOffset(2) > Public SYSTEM_STATUS As olmSYSTEM_STATU S
<FieldOffset(2) > Public REQUEST_ZONE_ST ATUS As olmREQUEST_ZONE _STATUS
<FieldOffset(2) > Public REQUEST_UNIT_ST ATUS As olmREQUEST_UNIT _STATUS '8bit
/ 16bit
<FieldOffset(2) > Public REQUEST_AUXILIA RY_STATUS As
olmREQUEST_AUXI LIARY_STATUS
<FieldOffset(2) > Public REQUEST_THERMOS TAT_STATUS As
olmREQUEST_THER MOSTAT_STATUS
<FieldOffset(2) > Public LOGIN As olmLOGIN
<FieldOffset(2) > Public REQUEST_SECURIT Y_CODE_VALIDATI ON As
olmREQUEST_SECU RITY_CODE_VALID ATION
<FieldOffset(2) > Public SECURITY_CODE_V ALIDATION As
olmSECURITY_COD E_VALIDATION
End Structure
4  5906 
Quick update... If I change the StructLayout to
<StructLayout(L ayoutKind.Auto) >, the code compiles without errors... haven't
check to see if it works as intended... anyone see any problems with using
Auto?
Thanks,
Danny
"Danny Mavromatis" <ne**@mavromati s.com> wrote in message
news:11******** *****@corp.supe rnews.com... I'm trying to set up a structure using unions (fieldoffset) and I'm
running
into a problem. When I try to setup a union of data array or
message type, I get the following error:
System.TypeLoad Exception: Could not load type 'Test.Message' from assembly
'Test, Version=1.0.222 8.19435, Culture=neutral , PublicKeyToken= null'
because
it contains an object field at offset 1 that is incorrectly aligned or
overlapped by a non-object field.
WHY?
<StructLayout(L ayoutKind.Expli cit)> _
Public Structure R_OMNI_LINK_MES SAGE
<FieldOffset(0) > Public MessageLength As Byte
' ....... THIS ONE DOESN'T WORK!!.... Throws Error
<FieldOffset(1) , MarshalAs(Unman agedType.ByValA rray, SizeConst:=255) >
Public
Data() As Byte
'.............. ............... ............... ............... ............... .....
<FieldOffset(1) > Public MessageType As Byte
<FieldOffset(2) > Public NAME_DATA As olmNAME_DATA ' 8bit / 16bit
<FieldOffset(2) > Public EVENT_LOG_DATA As olmEVENT_LOG_DA TA
<FieldOffset(2) > Public COMMAND_MESSAGE As olmCOMMAND_MESS AGE
<FieldOffset(2) > Public SET_TIME As olmSET_TIME
<FieldOffset(2) > Public SYSTEM_STATUS As olmSYSTEM_STATU S
<FieldOffset(2) > Public REQUEST_ZONE_ST ATUS As olmREQUEST_ZONE _STATUS
<FieldOffset(2) > Public REQUEST_UNIT_ST ATUS As olmREQUEST_UNIT _STATUS
'8bit
/ 16bit
<FieldOffset(2) > Public REQUEST_AUXILIA RY_STATUS As
olmREQUEST_AUXI LIARY_STATUS
<FieldOffset(2) > Public REQUEST_THERMOS TAT_STATUS As
olmREQUEST_THER MOSTAT_STATUS
<FieldOffset(2) > Public LOGIN As olmLOGIN
<FieldOffset(2) > Public REQUEST_SECURIT Y_CODE_VALIDATI ON As
olmREQUEST_SECU RITY_CODE_VALID ATION
<FieldOffset(2) > Public SECURITY_CODE_V ALIDATION As
olmSECURITY_COD E_VALIDATION
End Structure
More updates: Changing it to Auto isn't what I need since the fieldoffsets,
don't seem to be doing anything with Auto.
"Danny Mavromatis" <ne**@mavromati s.com> wrote in message
news:11******** *****@corp.supe rnews.com... Quick update... If I change the StructLayout to
<StructLayout(L ayoutKind.Auto) >, the code compiles without errors...
haven't check to see if it works as intended... anyone see any problems
with using Auto?
Thanks,
Danny
"Danny Mavromatis" <ne**@mavromati s.com> wrote in message
news:11******** *****@corp.supe rnews.com... I'm trying to set up a structure using unions (fieldoffset) and I'm
running
into a problem. When I try to setup a union of data array or
message type, I get the following error:
System.TypeLoad Exception: Could not load type 'Test.Message' from
assembly
'Test, Version=1.0.222 8.19435, Culture=neutral , PublicKeyToken= null'
because
it contains an object field at offset 1 that is incorrectly aligned or
overlapped by a non-object field.
WHY?
<StructLayout(L ayoutKind.Expli cit)> _
Public Structure R_OMNI_LINK_MES SAGE
<FieldOffset(0) > Public MessageLength As Byte
' ....... THIS ONE DOESN'T WORK!!.... Throws Error
<FieldOffset(1) , MarshalAs(Unman agedType.ByValA rray, SizeConst:=255) >
Public
Data() As Byte
'.............. ............... ............... ............... ............... .....
<FieldOffset(1) > Public MessageType As Byte
<FieldOffset(2) > Public NAME_DATA As olmNAME_DATA ' 8bit / 16bit
<FieldOffset(2) > Public EVENT_LOG_DATA As olmEVENT_LOG_DA TA
<FieldOffset(2) > Public COMMAND_MESSAGE As olmCOMMAND_MESS AGE
<FieldOffset(2) > Public SET_TIME As olmSET_TIME
<FieldOffset(2) > Public SYSTEM_STATUS As olmSYSTEM_STATU S
<FieldOffset(2) > Public REQUEST_ZONE_ST ATUS As olmREQUEST_ZONE _STATUS
<FieldOffset(2) > Public REQUEST_UNIT_ST ATUS As olmREQUEST_UNIT _STATUS
'8bit
/ 16bit
<FieldOffset(2) > Public REQUEST_AUXILIA RY_STATUS As
olmREQUEST_AUXI LIARY_STATUS
<FieldOffset(2) > Public REQUEST_THERMOS TAT_STATUS As
olmREQUEST_THER MOSTAT_STATUS
<FieldOffset(2) > Public LOGIN As olmLOGIN
<FieldOffset(2) > Public REQUEST_SECURIT Y_CODE_VALIDATI ON As
olmREQUEST_SECU RITY_CODE_VALID ATION
<FieldOffset(2) > Public SECURITY_CODE_V ALIDATION As
olmSECURITY_COD E_VALIDATION
End Structure
>System.TypeLoa dException: Could not load type 'Test.Message' from assembly 'Test, Version=1.0.222 8.19435, Culture=neutral , PublicKeyToken= null' because
it contains an object field at offset 1 that is incorrectly aligned or
overlapped by a non-object field.
WHY?
The error message pretty much tells you why. You can't have a
reference type (such as a byte array) overlap a value type.
Mattias
--
Mattias Sjögren [C# MVP] mattias @ mvps.org http://www.msjogren.net/dotnet/ | http://www.dotnetinterop.com
Please reply only to the newsgroup.
Yes, I'm trying to do unions, but, it freaks out when I want to have a union
with a fixed amount of data (255 bytes) and the data broken out by
structures.
So, I'd like to be able to to look at the data as the complete byte(255)
array or by name (defined by the structures). It can be done in VC.NET but
not in VB.NET???
The problem is that it thinks it overlapping when I compile, but it
shouldn't care, it's either one view or another (of the same data)... do I
need to use the overload method to achieve this?
Danny
"Mattias Sjögren" <ma************ ********@mvps.o rg> wrote in message
news:eX******** ******@TK2MSFTN GP09.phx.gbl... System.TypeLoa dException: Could not load type 'Test.Message' from
assembly
'Test, Version=1.0.222 8.19435, Culture=neutral , PublicKeyToken= null'
because
it contains an object field at offset 1 that is incorrectly aligned or
overlapped by a non-object field.
WHY?
The error message pretty much tells you why. You can't have a
reference type (such as a byte array) overlap a value type.
Mattias
--
Mattias Sjögren [C# MVP] mattias @ mvps.org
http://www.msjogren.net/dotnet/ | http://www.dotnetinterop.com
Please reply only to the newsgroup.
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