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mrtaikandi
mrtaikandi

Reputation: 6958

InvalidCastException: RPC_E_CANTCALLOUT_ININPUTSYNCCALL

I'm building an application in C# that has a static class which initiate a COM class and handles some event handlers of another class that hooks keyboard. When I call a method of the COM class from a button event handler in my WPF window, the method works without any problems but when I call it in one of the event callbacks within my static class it throws following exception:

Unable to cast COM object of type 'BLAHBLAH' to interface type 'BLAHBLAH'. This operation failed because the QueryInterface call on the COM component for the interface with IID '{9DD6680B-3EDC-40DB-A771-E6FE4832E34A}' failed due to the following error: An outgoing call cannot be made since the application is dispatching an input-synchronous call. (Exception from HRESULT: 0x8001010D (RPC_E_CANTCALLOUT_ININPUTSYNCCALL)).

Can you please tell me, what this exception means and how can I solve it?

Upvotes: 1

Views: 3911

Answers (2)

mvermand
mvermand

Reputation: 6137

Wrap your code in a new thread:

Thread thread = new Thread(() =>
{
    ManagementObjectSearcher theSearcher = new ManagementObjectSearcher("SELECT * FROM Win32_DiskDrive");
    foreach (ManagementObject currentObject in theSearcher.Get())
    {
        Debug.WriteLine("Device present: " + currentObject);          
        ManagementObject theSerialNumberObjectQuery = new ManagementObject("Win32_PhysicalMedia.Tag='" + currentObject["DeviceID"] + "'");
        serial = theSerialNumberObjectQuery["SerialNumber"].ToString();
    }
});
thread.Start();
thread.Join(); //wait for the thread to finish

Upvotes: 1

Vinay
Vinay

Reputation: 4793

Refer this KB http://support.microsoft.com/kb/198996 Looks like it is because of threads(May not be user defined threads)

Upvotes: 0

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