How is the callback control ID parameter determined?

The reason I ask is that I seem to be getting unexpected results in a control callback. I have a Table control, which is then duplicated (many times) in the same position as the original. I switch between them by setting the ATTR_VISIBLE attribute on just one at a time, but whichever one is presented on the GUI I always get the same control ID passed in the common callback - the ID is of the last one duplicated, even if it is not visible. I have a workaround, of course, since I know which one I have made visible: it's just that to have the correct callback ID would have been more convenient.
Just guessing, but it seems that CVI searches for any control whose XY coordinates match the position of the mouse, and ignores whether that control is visible or not. Surely not the best way to do it...
Mike
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According to my experience, when the callback responds to EVENT_COMMIT and EVENT_GOT_FOCUS events it receives the correct control ID even in case of overlapping controls; I never used EVENT_xxx_CLICK events in such a manner (which I suppose you are using since you are speaking of mouse coordinates) so I cannot tell anything for sure but in my opinion the system can respond returning the control ID of the topmost control (which is the last one created and seconds your observations). While I don't know if this is true and agree with you that an invisible control should not respond to any event, I can suggest you to add one simple SetCtrlAttribute instruction immediately after making visible one of the tables to make it the topmost control (I seem to remember that the related attribute is ATTR_ZPLANE_POSITION with a value of 0 to let it topmost but I cannot check at the moment; look in the online help for detailed documentation).
Proud to use LW/CVI from 3.1 on.
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How: Using the same control panel for multiple vi and propogating changes to the control panel.

I have created a labview project that contains about 40 vi. Each vi has a control panel in common that is a group of ip address, or port address, and settings that are passed from high level vi to low level vi for the purposes of controlling and accessing our daq cards. As this control panel exist in all vi's and is required to be identical there is a problem when needing make a change or update the controls during development. The problem is how much time it takes to go and change every single vi's control panel. I wish to have a way of propogating a change in the control panel across all vi simultaneously.
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Attachments:
Labjack Comm Settings.vi ‏15 KB

Yes a type def would help you out and I'd take the next step to make it a strict type def if you want the appearence to be the same across all of its instances. You can also review this Nugget on Type definitions for more idea on this topic.
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Originally Posted by wyldkao
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I created 8 command buttons and created same callback for all the buttons. Also have a 2x4 array initialized to value of 1. When user clicks any button the 2x4 array value should change to 0 (as command button does not change value to 1 when selected). In order to fill the array I thought of using control from CVICALLBACK.
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Hi, this is a common isue that has been discussed several times on the forums and does not have a fast response.
First of all, you should not modify the include file associated to the UIR file, as stated on top of it, since the system automatically regenerates it every time it saves the UIR. Additionally, the ID assigned to the controls depends on the tab order you define on the panel, so it is subject to change. FYI, this is a discussion on this subject that you may want to read: as you can see, it originates from a question very similar to yours.
Despite what I have said, control IDs actually can be used to discriminate between controls, so in your situation, and provided the buttons are assigned a progressive ID with the tab editor (Ctrl+T on the panel and assign the IDs clicking on the controls), your code could be rewritten this way:
if(control >= PANEL_BUTTON1 && control <= PANEL_BUTTON4)
row = 0;
else if(control >= PANEL_BUTTON5 && control <= PANEL_BUTTON8)
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else if(control >= PANEL_BUTTON9 && control <= PANEL_BUTTON12)
row = 2;
else
row = 3;
For the same reason, you cannot use 'control' as an index on the array, as you have no possibility to foreseen the ID value. That is, even if rewritten the way I told you, that code is not likely to work...
In my opinion the correct way of discriminating between controls is to add a switch inside the callback:
switch (control) {
case PANEL_BUTTON1: ctr_btns[0][0] = 1; break;
case PANEL_BUTTON2: ctr_btns[0][1] = 1; break;
case PANEL_BUTTON5: ctr_btns[1][0] = 1; break;
( but you should create a 4x4 array of values).
Proud to use LW/CVI from 3.1 on.
My contributions to the Developer Zone Community
If I have helped you, why not giving me a kudos?

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How to handle the table control in bapi?

how to handle the table control in bapi? example va01.
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Message was edited by:
Karthikeyan Pandurangan

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Set sapFunctions=CreateObject("SAP.Functions")
Following code snippet shows how I attempt to set exports and add a table row before calling the function module:
sapFunctions.Connection = sapConnection
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With sapMaterialUpd
'set exports
 .Exports("PA_GLPUPDLEVEL") = "S"
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End With
'call the function module
If sapMaterialUpd.Call() = True Then
 'do something with the return tables here...Else
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End If
The Call() returns FALSE and the exception is "SYSTEM_FAILURE". The connection also resets.
The local logfile that the control generates shows that an exception occurs at the point of the call:
10.02.2005 17:54:20.766 Packing Parameters for Z_SD_BAPI_SALES_DATA_UPD
Packing Parameter PA_GLPUPDLEVEL.
Packing Parameter PA_VKORG.
Packing Table 0.
Packing Table 1.
10.02.2005 17:54:20.766 *** Calling RFC Function 'Z_SD_BAPI_SALES_DATA_UPD'
10.02.2005 17:54:20.986 RFC CALL status = RFC_SYS_EXCEPTION
10.02.2005 17:54:20.986 RFC Error: RFC_IO27
-Status:CODE=CM_DEALLOCATED_NORMAL STATUS=CM_NO_STATUS_RECEIVED DATA=CM_COMPLETE_DATA_RECEIVED ID=69415076
-Message:connection closed
-Internal Status:IO HANDLE=23 DRV=EXT LINE=1420 CODE=27 : GET ID=ffff LINE=861 CODE=7
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Seen next code snippet. If the Table object is not touched, the function call goes through without any problems:
sapFunctions.Connection = sapConnection
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 'do not append a table row, for testing only ;-)
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Any hints are welcome!

hi All partner,
who solved this problem , I meet it too and
can't clear it.
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SAPitab := sapfunc.tables.item ('I_DNMO');
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SAPitab.value(1,'DEDAT') := '2005/09/09';
SAPitab.value(1,'LFIMG') := '100';
IF SAPfunc.call = true then
begin
end
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 showmessage('call fail!!') ;
 end;
end;
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FUNCTION z_get_sfcs_dn_mo.
""Local interface:
*" TABLES
*" I_DNMO STRUCTURE ZDN_MO
data: wa type zdn_mo.
LOOP AT i_dnmo.
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 wa-lfimg = i_dnmo-lfimg.
 modify zdn_mo from wa.
 insert into zdn_mo values wa. --dump at here
 commit work.
ENDLOOP.
T/C: ST22 error message say at
insert into zdn_mo values wa. ---dump at here
the sapfunc.call returns fail.
Message was edited by: jorry wang

How is the callback control ID parameter determined?

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