How to receive events from objects?

[Antonio Linares]

And here an example of use:

__axRegisterHandler( o:__hObj, {| ... | MsgInfo( ... ) } )

[Jose Dolar]

Antonio,

The topic was posted sometime in 2008.

Sounds great that it is there, but I'm getting a link error .

What is the library file and where to get the MyInclude.ch?

BTW I used it this way: oOle:=OleWEvent():New(cProgId)

Regards, Saludos

Jose

[Antonio Linares]

Jose,

As I have explained, it seems as you don't need that library at all

Simply try to use this:
__axRegisterHandler( o:__hObj, {| ... | MsgInfo( ... ) } )

[Jose Dolar]

Antonio,

I didn't notice the info on the second page. I tried to follow the code in the prg sample.

But my application terminated after the Alert("here")

Error -2147220992 WINOLE/1014 Failed to obtain connection point: __AXREGISTERHANDLER Args: (P:0x484EA9C) (B:{|| ... })

Thanks,

Jose



Method Instantiate_Device(cProgID) class OPOSHardwareInterface
local oOle:='',n
::lDeviceInstantiated:=.f.
oOle:=CreateObject(cProgID)
if valtype(oOle)='O'
::lDeviceInstantiated:=.t.
alert('Here')
__axRegisterHandler( oOle:__hObj, {| a,b,c | MsgInfo( 'Test') }) && What are the parameters of the codeblock?
aadd(::aoDevices,oOle)
* aadd(::aoDevices,oOle:oOleAuto)
endif
return oOle

[Antonio Linares]

Please check this value:

MsgInfo( oOle:__hObj )

and let me know it

[Jose Dolar]

The valtype (oOle:__hObj) is P

The value differs as shown below.

OS Error -2147220992 WINOLE/1014 Failed to obtain connection point: __AXREGISTERHANDLER Args: (P:0x2CDAD04)
OS Error -2147220992 WINOLE/1014 Failed to obtain connection point: __AXREGISTERHANDLER Args: (P:0x30DA6CC)

[Antonio Linares]

Jose,

Please try suplying the third parameter: cIID

function __AXREGISTERHANDLER( pDisp, bHandler [, cIID] ) --> pSink

What are the parameters of the codeblock?

"..." means "whatever it is supplied". We may get different amount of params for an event based on the used OLE object.

[Jose Dolar]

Antonio,

What is cIID?

If cIID is the ole program ID (cProgID in my code) then I tried that and my up terminated.

error: WINOLE/1014 Failed to obtain connection point: __AXREGISTERHANDLER Args: (P:0x473A43C) (B:{|| ... }) (C:OPOS.POSPrinter)

Thanks,

Jose

[Antonio Linares]

Jose,

have you started the cIID with '{' ?

It must start with '{' and end with "}"

[Jose Dolar]

Hi Antonio,

What is {cIID}? A new syntax? Looks like an array..

Anyway I tried both as shown below and still resulted to the same error

Thanks,

Jose

Method Instantiate_Device(cProgID) class OPOSHardwareInterface
local oOle:='',n,cIID
::lDeviceInstantiated:=.f.
oOle:=CreateObject(cProgID)
if valtype(oOle)='O'
::lDeviceInstantiated:=.t.
alert(valtype(oOle:__hObj))
alert('Here')
*__axRegisterHandler( oOle:__hObj, {| ...| MsgInfo( 'Test') },{cProgID}) && What are the parameters of the codeblock?
__axRegisterHandler( oOle:__hObj, {| ...| MsgInfo( 'Test') },{cIID}) && What are the parameters of the codeblock?
alert('Done')
aadd(::aoDevices,oOle)
* aadd(::aoDevices,oOle:oOleAuto)
endif
return oOle

[Jose Dolar]

Antonio,

Do I need to include the oleWEvents0.c and oLeWEvents.prg to my App?

Thanks,

Jose

[Antonio Linares]

Jose,

You don't have to include those files in your app.

Here you can read about cIID:

cIID
Specifies the Interface ID GUID of cCLSID | cPROGID when you create an early bound instance of the class. If you pass an empty string as cIID Visual FoxPro attempts to access the default interface (IID) of cCLSID | cPROGID.
Example

x = CREATEOBJECTEX("excel.application","",;
"{000208D5-0000-0000-C000-000000000046}")

The "{" and "}" are part of the name. They are not related to arrays, etc.

We are not going to use it (like the above example) in CreateObject(). We just use it from __axRegisterHandler()

[Jose Dolar]

Antonio,

OK, I found cIID, but still got the following error. I also send you a screen shot of my COM viewer where I got cIID (I can't find attach option here). Please check. Thanks.

Error: OS Error -2147220992 WINOLE/1014 Failed to obtain connection point: __AXREGISTERHANDLER Args: (P:0x484F564) (B:{|| ... }) (C:{B196B284-BAB4-101A-B69C-00AA00341D07})

Thank you,

Jose

Code: Select all  Expand view

Method Instantiate_Device(cProgID) class OPOSHardwareInterface
local oOle:='',n
local ciid:='{B196B284-BAB4-101A-B69C-00AA00341D07}'  && <-- IconnectionPointContainer
::lDeviceInstantiated:=.f.
oOle:=CreateObject(cProgID)
if valtype(oOle)='O'
    ::lDeviceInstantiated:=.t.
if cprogid='OPOS.POSPrinter'
alert(ciid)
__axRegisterHandler( oOle:__hObj, {| ...| MsgInfo( 'Test') },ciid) && <-- IconnectionPointContainer
alert('Handler registered')
endif
    aadd(::aoDevices,oOle)
endif
return oOle

[Antonio Linares]

Jose,

Welcome to the nightmare of the OLE objects... :-S

Here you have the source code for __AXREGISTERHANDLER()

https://github.com/harbour/core/blob/master/contrib/hbwin/axcore.c

Check its code please, you will see there are just two places where it is checked. If it does not work, then I am afraid that very little we can do, except if you contact that OLE tech support service and show them the source code (in axcore.c) that you are using.

[Jose Dolar]

Antonio,

I agree, this might be beyond Harbour as Carlos was successful using this function with a different OLE service.

Or may be it's just the version of my compiler.

I am still using Harbour 2.1. I checked the logs and there was many changes related to axcore.c to date. I hope one of these changes fixed this issue..

Thank you for your support. I appreciate it.

Saludos,

Jose