Microsoft Access Automation Error
The Microsoft Excel Support Team Blog The Microsoft Excel Support Team Blog 'Unspecified Automation Error' after applying MS12-060 (updated 9/26) Will Buffington MSFT August 15, 2012 29. Automation of Business Processes (including accounting, CRM, emailing, faxing, and custom document production). Microsoft Access® Data Projects (ADP) upgrades to Microsoft Access.accdb format. Microsoft® Access® Database Developers, Microsoft Access Help, & Microsoft Access Technical Support. Free Microsoft® Access® Database Templates.
Summary
A .Net 64 bit application automating Microsoft Access throws an error while opening Access database. Same code works fine when run as 32 bit .Net application. Below is the sample code to reproduce this issue:
Microsoft.Office.Interop.Access.Application accessApplication;
accessApplication = new Microsoft.Office.Interop.Access.Application(); Ide ata atapi controllers drivers.
accessApplication.OpenCurrentDatabaseOld('<Path to .accdb file>', true);
Microsoft Access Error Codes
Below is the exception message:
'Unable to cast COM object of type 'system._comObject' to interface type 'Microsoft.Office.Interop.Access.Application'. This operation failed because the QueryInterface call on the COM component for the interface with IID '{<missing text>}'failed due to the following error: Error loading type library/DLL. (Exception from HRESULT:0x80029C4A(TYPE_E_CANTLOADLIBRARY)).'.
Symptoms
Error message : “Error loading type library/DLL. (Exception from HRESULT:0x80029C4A(TYPE_E_CANTLOADLIBRARY)) “.
Microsoft Access Automation Error The Remote Procedure Call Failed
Cause
64 bit .Net application is not able to find DAO360.dll which is looked-up during Access automation and is located at 'C:Program Files (x86)Common FilesMicrosoft sharedDAO'. This Path is not listed in the probing directories of .Net application.
Also DAO360.dll is registered only under Wow6432Node and hence 64 bit .Net application is not able to find it via registry lookup.
Resolution
Adding DAO360.dll’s path to ‘PATH’ environment variable resolve this issue. Note that directories listed under PATH environment variable are included in the proving directories of .Net application.
Below is the code to modify ‘PATH’ environment variable in-process. In-process means that changes to PATH environment variable will not be visible outside the process or after application quits. This code should be pasted before instantiating Access.
string PathValue = ';
string sAdd = ';
string strCommonFiles =
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System.Environment.GetEnvironmentVariable('CommonProgramFiles(x86)');
sAdd = ';' + strCommonFiles + 'microsoft sharedDAO';
PathValue = System.Environment.GetEnvironmentVariable('Path');
PathValue += sAdd;
bool result = SetEnvironmentVariable('path', PathValue);
-->When you access Automation objects, specific types of errors can occur. This error has the following possible causes and solutions:
An error occurred while executing a method or getting or setting a property of an object variable. The error was reported by the application that created the object.
Check the properties of the Err object to determine the source and nature of the error. Also try using the On Error Resume Next statement immediately before the accessing statement, and then check for errors immediately following the accessing statement.
The Office add-in that you are trying to use has been disabled by your System Administrator.
For additional information, select the item in question and press F1 (in Windows) or HELP (on the Macintosh).
Note
Interested in developing solutions that extend the Office experience across multiple platforms? Check out the new Office Add-ins model. Office Add-ins have a small footprint compared to VSTO Add-ins and solutions, and you can build them by using almost any web programming technology, such as HTML5, JavaScript, CSS3, and XML.
Support and feedback
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