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Join them; it only takes a minute: Sign up Automation Error when instantiating a .Net COM visible class up vote 5 down vote favorite 1 I created a COM-interop .dll with this simple class: using System.Runtime.InteropServices; namespace ClassLibrary1 { [ComVisible(true)] [Guid("795ECFD8-20BB-4C34-A7BE-DF268AAD3955")] public interface IComWeightedScore { int Score { get; set; } int Weight { get; set; } } [ClassInterface(ClassInterfaceType.None)] run time error '-2147024894' [Guid("9E62446D-207D-4653-B60B-E624EFA85ED5")] public class ComWeightedScore : IComWeightedScore { private int _score; public int Score { get { return _score; } set { _score = value; } } private int _weight; public int Weight { get { return _weight; } set { _weight = value; } } public ComWeightedScore() { _score = 0; _weight = 1; } } } I registered it using: C:\WINDOWS\Microsoft.NET\Framework\v4.0.30319\regasm C:\ComClasses\Classlibrary1.dll /tlb: Classlibrary1.tlb Finally I succesfully added a reference to the .dll after which VB6 gave me intellisense on the object. Private Sub Form_Load() Dim score1 As ComWeightedScore Set score1 = New ComWeightedScore score1.Score = 500 End Sub On the line Set score1=new ComWeightedScore the exception Automation Error is raised. It can hardly be any simpler than this... Where is the error?! .net vb6 com-interop share|improve this question edited Aug 29 '11 at 4:07 asked Aug 28 '11 at 22:01 Dabblernl 7,2231366124 And why do you say the error is in assigning int or long? what fails is the constructor call. Does it still fail if you remove the assignments fr
resources Windows Server 2012 resources Programs MSDN subscriptions Overview Benefits Administrators Students Microsoft Imagine Microsoft Student Partners ISV Startups TechRewards Events Community Magazine Forums Blogs Channel 9 Documentation APIs and reference Dev centers Retired content Samples We’re sorry. The content you requested has been removed. You’ll be auto redirected in 1 second. Reference Trappable Errors Core Visual Basic Language Errors Core Visual Basic Language Errors 440 Automation error 440 Automation error 440 Automation error 3 Return without GoSub 5 Invalid procedure call or argument 6 Overflow 7 Out of memory 9 Subscript out of range 10 This array is fixed or http://stackoverflow.com/questions/7224255/automation-error-when-instantiating-a-net-com-visible-class temporarily locked 11 Division by zero 13 Type mismatch 14 Out of string space 16 Expression too complex 17 Can't perform requested operation 18 User interrupt occurred 20 Resume without error 28 Out of stack space 35 Sub, Function, or Property not defined 47 Too many DLL application clients 48 Error in loading DLL 49 Bad DLL calling convention 51 Internal error 52 Bad file name https://msdn.microsoft.com/en-us/library/aa264508(v=vs.60).aspx or number 53 Can't find specified file 54 Bad file mode 55 File already open 57 Device I\O error 58 File already exists 59 Bad record length 61 Disk full 62 Input past end of file 63 Bad record number 67 Too many files 68 Device unavailable 70 Permission denied 71 Disk not ready 74 Can't rename with different drive 75 Path\File access error 76 Path not found 91 Object variable or With block variable not set 92 For loop not initialized 93 Invalid pattern string 94 Invalid use of Null 96 Can't sink this object's events because it's already firing events... 97 Can't call Friend procedure on an object that isn't an instance of... 98 A property or method call cannot include a reference to a private ... 321 Invalid file format 322 Can't create necessary temporary file 400 Form already displayed; can't show modally 422 Property not found 429 ActiveX component can't create object or return reference to this... 430 Class doesn't support Automation 432 File name or class name not found during Automation operation 438 Object doesn't support this property or method 440 Automation error 442 Connection to type library or object libr
Ask a Question Need help? Post your question and get tips & solutions from a community of 418,497 IT https://bytes.com/topic/visual-basic-net/answers/598457-vb6-automation-error-trying-use-com-exposed-c-dll Pros & Developers. It's quick & easy. VB6 automation error trying to http://microsoft.public.winhttp.narkive.com/qv82SoD4/automation-error-error-in-the-dll use a COM-exposed C# DLL P: n/a Tremendo Hi, I have two PCs: PC1: Visual Studio 2005 (including .NET framework 2.0. PC2: Visual Studio 6 (using Visual Basic 6) + .NET framework 2.0 installed separately. On PC1 I wrote and built a C# DLL (see code below), automation error and created one .tlb and one .reg file to expose its methods to COM. On PC2 I copied the .dll, .tlb and .reg into WINDOWS\system32, and executed the .reg to insert new entries to the registry. In Visual Basic 6, I created a new project, and added a reference to the ..tlb. So far, everything seems to be ok. dll automation error I can see the class in the object inspector, and browse its methods and enumerations. Also, the tool that shows as I type the valid methods and parameters works ok. Compilation to exe works fine. Problems start at run time. Just trying to instantiate one instance of the COM exposed class gives me a "Run-time error '-2147024894 (80070002) Automation error'". See VB6 code below, too. Both listings have dummy code. Any hint about what can this be due to? Thank you, Tremendo %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% %%%%%%%%%%%%%%%% using System; using System.Text; using System.Runtime.InteropServices; namespace N_Proc_CC1100_Test { public enum RadiobandTypes { RadiobandR =0, RadiobandRC, RadiobandRCS, RadiobandT } // ================================================== ======================= [GuidAttribute("AEB5062F-6695-4484-B07A-53C37A99E92B")] [InterfaceTypeAttribute(ComInterfaceType.InterfaceI sIDispatch)] public interface _C_Proc_CC1100_Test { [DispIdAttribute(1)] bool EnterTestMode(int RadiobandType); [DispIdAttribute(2)] bool LeaveTestMode(); [DispIdAttribute(3)] bool GetSoftwareVersion(out int version); [DispIdAttribute(4)] bool TestRF(out double PeakFrequency_MHz,out double PeakPower_dBm); [DispIdAttribute(5)] bool SetOutputs(int outputs); [DispIdAttribute(6)] bool GetInputs(out int inputs); } // ================================================== ======================= [GuidAttribute("A9BA5B44-A432-44ab-9AFA-6C8058B20AA8")] [ClassInterfaceAttribute(ClassInterfaceType.None)] [ProgIdAttribute("N_Test.C_Test")] public class C_Proc_CC1100_Test : _C_Proc_CC1100_Test { public RadiobandTypes RadiobandType; public bool InTestMode; // .................................................. ................... public C_Proc_CC1100_Test() { RadiobandType =RadiobandTypes.RadiobandR; InTestMode =false; } // .................................................. ................... publi
try to instantiate a WinHttpRequest object, using WinHTTP5.0, as below:Private HttpReq As WinHttp.WinHttpRequestSet HttpReq = CreateObject("WinHttp.WinHttpRequest.5")This declaration is inside a Class module. I do not seem to get thesame error if it is in a form. Also, I have never experienced theerror when the project is compiled and run as an .exe. It onlyhappens when I am running the program in the IDE. On one PC, if iclose the project and re-open it, the error does not occur until afterseveral runs of the program. However, on other PCs, I have never beenable to successfully run the program in the IDE. The whole thingseems very odd!Does anyone know what might be causing this error and how I cancorrect it? Any suggestions would be greatly appreciated!Thanks,BrentBACKGROUND INFO:----------------Visual Basic 6Windows 2000 SP2IE 5.5WINHTTP5.dll is installed and registered Stephen Sulzer 2003-11-19 02:13:37 UTC PermalinkRaw Message Hello Brent,The "Error in the DLL" is a bug in WinHTTP 5.0 that sometimes causes theWINHTTP5.DLL to fail to load. (The DLL raises an exception while loading.)This bug was fixed in WinHTTP 5.1, which is available with Windows 2000SP3/SP4, Windows XP SP1 and Windows Server 2003.I do not believe a fix is available for WinHTTP 5.0, but I am not certainabout this. The latest set of patches for WinHTTP 5.0 is the "Rollup2Hotfix", which can be obtained from Microsoft PSS. See KB article 813793-http://support.microsoft.com/default.aspx?scid=kb;en-us;813793.If the Rollup2 Hotfix does not fix the problem, and you cannot migrate toWinHTTP 5.1, then you'll need to escalate a hotfix request with MicrosoftPSS.The only workaround I can suggest is to try to load the WinHTTP5.DLL intoyour process as early as possible, before other components are loaded. Ifyou are using WinHTTP5 in a VB project that uses many other components orclasses, then try creating a dummy global WinHttpRequest object during yourprogram's initialization before you instantiate any other components.StephenPost by Brent McLarenHi,I am receiving this error message ("Automation error, Error in theDLL") when I try to instantiate a WinHttpRequest object, using WinHTTPPrivate HttpReq As WinHttp.WinHttpRequestSet HttpReq = Crea