Calling ASCOM ICameraV3.StartExposure Method throw exception

[tsat...@gmail.com]

Hi ,

I am Calling ASCOM  ICameraV3.StartExposure Method  example  :

AscomDriver extends COMLateBindingObject ......

public void invokeAscom(String methodName , Variant.VARIANT param1, Variant.VARIANT param2) {

try {

this.invoke(methodName, param1, param2);

}catch(COMInvokeException ex) { ex.printStackTrace(); }

} double expoTime = 5.0d; boolean light = true ;

ascomDriver.invokeAscom("StartExposure" , new VARIANT(expoTime) , new VARIANT(light) ;

throw this exception : 

com.sun.jna.platform.win32.COM.COMInvokeException: Exception occurred.(HRESULT: 80020009)

Source: ASCOM.OmegonPro

Description: External component has thrown an exception.

at com.sun.jna.platform.win32.COM.COMUtils.checkRC(COMUtils.java:187)

at com.sun.jna.platform.win32.COM.COMBindingBaseObject.oleMethod(COMBindingBaseObject.java:421)

at com.sun.jna.platform.win32.COM.COMBindingBaseObject.oleMethod(COMBindingBaseObject.java:191)

at com.sun.jna.platform.win32.COM.COMLateBindingObject.invoke(COMLateBindingObject.java:281)

at com.sun.jna.platform.win32.COM.COMLateBindingObject.invoke(COMLateBindingObject.java:298)

at server.AscomDriver.invokeAscom(AscomDriver.java:113)

at server.AscomCcdCamera$1.run(AscomCcdCamera.java:353)

[Matthias Bläsing]

Hi,

80020009 is DISP_E_EXCEPTION:

https://learn.microsoft.com/de-de/dotnet/api/microsoft.visualstudio.vsconstants.disp_e_exception?view=visualstudiosdk-2022

That leads me to this:

https://ascom-standards.org/Help/Platform/html/M_ASCOM_DeviceInterface_ICameraV3_StartExposure.htm

and that leads me to the assumption, that the parameters are wrong.

Greetings

Matthias

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[tsat...@gmail.com]

Hi ,

thanks for the answer I pass double value as first parameter and boolean as second parameter as stated in the ASCOM Platform for the the StartExposure method  both parameters in VARIANT ??  I checked both parameters VARIANT objects and they have correct values 1 parameter as double and 2 parameter as boolean ??

Best Regards

[Matthias Bläsing]

Hi,

I mean, that your device might

a) not be connected (NotConnectedException)

b) true for light or 5.0d for expoTime is not supported for your device (InvalidValueException)

c) Another problem occurs (DriverException)

Greetings

Matthias

[tsat...@gmail.com]

Hi  Matthias ,

true for light or 5.0d for expoTime are just an example to illustrate the issue , the camera is connected and checked and its proprieties are read correctly using JNA   , the program is far more complex than that , the problem  there is no clear exception indicate the real cause , is there any way to catch the exception from ASCOM driver from JNA ??

Best Regards

[tsat...@gmail.com]

Hi  Matthias,

after analyzing and testing the issue it turn out to be a driver issue and not JNA  , thanks foe efforts.

Best Regards