com_module_sample
This is an old revision of the document!
Create a COM module for a VO application
- Create a prg file for the interface
begin namespace COMTest using System.Runtime.InteropServices [ComVisible(true)]; [Guid("750E557E-9DA6-4508-A36E-C4141D27B5D4")]; [InterfaceType(ComInterfaceType.InterfaceIsIDispatch)]; interface ICOMTester [DispId(1)]; method Output() as string end interface end namespace
The GUID needs to be created with the GuidGen.exe tool.
- Create a prg file for the functionality itself:
using System.Runtime.InteropServices begin namespace COMTest [ComVisible(true)]; [Guid("7D1DF22E-3A3D-431C-8BEE-A2F40C53A249")]; [ClassInterface(ClassInterfaceType.None)]; [ProgId("COMTest.COMTester")]; class COMTester implements ICOMTester public constructor() return public virtual method Output() as string return "Hi from my component" end class end namespace
- Build the application (i.e. the DLL)
- create a snk file: sn - k COMTest.snk
- add this snk file as signature to your DLL (Application Properties - Advanced - Assembly signing in XIDE)
- build your application
- read the public key from the application: sn -T COMTest.dll (upper case “T”) and write it somewhere
- create the TLB with administrative (elevated) rights: tlbexp COMTest.dll
- create the automation server in VO using the created TLB
- edit the Init() method of the created VO class adding the cProgId and the cClsId using the GUIDs from your library. The cClsId uses the GUID from your class, the cIID the one from your interface.
METHOD Init(ObjID, fROTCHECK) CLASS ICOMTester self:cProgID := "COMTest.COMTester" self:cClsID := "{7D1DF22E-3A3D-431C-8BEE-A2F40C53A249}" self:cIID := "{750E557E-9DA6-4508-A36E-C4141D27B5D4}" SUPER:Init(ObjID, 0, .T., fRotCheck) SELF:_dwFuncs := 1 SELF:_dwVars := 0 RETURN SELF
- create the manifest for your COM assembly: mt.exe -managedassemblyname:COMTest.dll -nodependency -out:COMTest.dll.manifest
- fix this manifest by replacing processorarchitecture “msil” by “win32” (and maybe beautify the file…)
Possible problems:
- you can encounter error 0x80131044 when trying to create the TLB from a already strong named DLL if the dependencies of your COM dll are not strong named. In this case simply compile your library without the signing option
- you should set the namespace also in the project properties
- the exported class cannot have the same name as the COM DLL itself
- to debug your VO application:
Debugging (if the VO application does not starts): sxstrace Trace -logfile:systrace.out sxstrace Parse -logfile:systrace.out -outfile:sxstrace.txt notepad sxstrace.txt
com_module_sample.1516637536.txt.gz · Last modified: 2018/01/22 16:12 by wolfgangriedmann