topic Re: error regarding events in Application Development and Automation Discussions

error regarding events

Former Member — Wed, 17 Sep 2008 10:50:03 GMT

Hi All,

I am getting the below error when the code provided below is getting executed. Am getting error at

call method G_TREE->SET_REGISTERED_EVENTS statement.

The error is

"Access not possible using 'NULL' object reference"

Please refer this code....

EVENT-EVENTID = CL_GUI_SIMPLE_TREE=>EVENTID_NODE_DOUBLE_CLICK.

EVENT-APPL_EVENT = ' '.

append EVENT to EVENTS.

call method G_TREE->SET_REGISTERED_EVENTS

exporting

EVENTS = EVENTS

exceptions

CNTL_ERROR = 1

CNTL_SYSTEM_ERROR = 2

ILLEGAL_EVENT_COMBINATION = 3.

set handler

G_APPLICATION->HANDLE_NODE_DOUBLE_CLICK

for G_TREE.

What could be the mistake i am commiting?

Re: error regarding events

Former Member — Wed, 17 Sep 2008 10:56:07 GMT

EVENT-EVENTID = CL_GUI_SIMPLE_TREE=>EVENTID_NODE_DOUBLE_CLICK.

EVENT-APPL_EVENT = ' '.

append EVENT to EVENTS.

call method G_TREE->SET_REGISTERED_EVENTS

exporting

EVENTS = EVENTS

exceptions

CNTL_ERROR = 1

CNTL_SYSTEM_ERROR = 2

ILLEGAL_EVENT_COMBINATION = 3.

set handler

G_APPLICATION->HANDLE_NODE_DOUBLE_CLICK

for G_TREE.

I guess you are declaring G_TREE Type Ref To CL_GUI_SIMPLE_TREE.

You need to create and Object

Create object G_TREE before you can use it to call a method

santhosh

Re: error regarding events

Former Member — Wed, 17 Sep 2008 11:19:42 GMT

Thanks Kaluvala. I had put the create object statement after that call method statement.

I am getting error for this statement as well.

SET HANDLER g_application->handle_node_double_click FOR g_tree.

I have declared a class as

CLASS lcl_application DEFINITION DEFERRED.

I created the ref variable for this class.

DATA: g_application TYPE REF TO lcl_application,

I appreciate your previous help. Thanks.

Re: error regarding events

Former Member — Wed, 17 Sep 2008 11:26:06 GMT

Hi,

Always remember if you are using -> it means you are reffering to some method of an object unlike while using => where the method is static or instance-independent

I guess before setting the handle you need to create object for g_application as well

Create Object G_APPLICATION. did you do this?

SET HANDLER g_application->handle_node_double_click FOR g_tree.

santhosh

Re: error regarding events

Former Member — Wed, 17 Sep 2008 11:36:59 GMT

Thanks for your help