Examples with COMException com.sun.jna.platform.win32.COM.COMException used on opensource projects

Example 21 with COMException

use of com.sun.jna.platform.win32.COM.COMException in project jna by java-native-access.

the class ProxyObject method queryInterface.

@Override
public <T> T queryInterface(Class<T> comInterface) throws COMException {
    assert COMUtils.comIsInitialized() : "COM not initialized";
    try {
        ComInterface comInterfaceAnnotation = comInterface.getAnnotation(ComInterface.class);
        if (null == comInterfaceAnnotation) {
            throw new COMException("queryInterface: Interface must define a value for iid via the ComInterface annotation");
        }
        final IID iid = this.getIID(comInterfaceAnnotation);
        final PointerByReference ppvObject = new PointerByReference();
        HRESULT hr = ProxyObject.this.getRawDispatch().QueryInterface(new REFIID(iid), ppvObject);
        if (WinNT.S_OK.equals(hr)) {
            Dispatch dispatch = new Dispatch(ppvObject.getValue());
            T t = this.factory.createProxy(comInterface, dispatch);
            // QueryInterface returns a COM object pointer with a +1
            // reference, we must drop one,
            // Note: createProxy adds one;
            int n = dispatch.Release();
            return t;
        } else {
            String formatMessageFromHR = Kernel32Util.formatMessage(hr);
            throw new COMException("queryInterface: " + formatMessageFromHR);
        }
    } catch (Exception e) {
        throw new COMException("Error occured when trying to query for interface " + comInterface.getName(), e);
    }
}