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Forums > Silicon-package-board > Shared code - SKILL

Subject: Override or hook read-only function - how?
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shirsch
Posts: 1
Online: User is Offline
2/22/2006 11:18 AM  
This is more in the nature of a general Skill question, but this topic seems to be the most active, so forgive the intrusion.

Does anyone know if there's a means to hook or override native code function objects? For example, if I wanted to log all invocations of the various ipc* functions it would be handy to be able to place a routine of my own in the control flow, grab and log the args and then pass control to the "real" ipc routine.

All the ipc* functions show up as being read-only and any attempt at assigning a new function to the symbol results in an error.

Any input or insight will be appreciated.

Steve
AshCan
Posts: 20
Online: User is Offline
2/22/2006 1:23 PM  
Here is an example that may be useful.
The ipc356_out command is called when you select File -> Export -> IPC356 from the main Allegro menu. You want to do something a little different then the generic ipc356_out function.

First you would need to build the function you do wish to execute (some special extracta routines or specialized database reads, perhaps using a customized form UI). Let's say that you call this compiled Skill function "my_IPC_out".

You can use the axlCmdRegister utility to "create" a user-defined Allegro command or, in this case, you would use this utility to redefine the existing Allegro command.

axlCmdRegister("ipc356_out" 'my_IPC_out)

Now when you enter ipc356_out from the Allegro command line the compiled function "my_IPC_out is executed. If you want to call the custom function from the Allegro menu you could ....

axlCmdRegister("ipc356_private" 'my_IPC_out)

and then modify your Allegro menu from ....
MENUITEM "IP&C 356...", "ipc356 out"
to ....
MENUITEM "IP&C 356...", "ipc356_private"
AshCan
Posts: 20
Online: User is Offline
2/22/2006 1:25 PM  
Or you could just use:
axlCmdRegister("ipc356 out" 'my_IPC_out)
and make no Allegro menu changes.
Dave Elder
Moderator
Posts: 150
Online: User is Offline
2/22/2006 1:43 PM  
I think the function you are after is clearFnWriteProtect

However, this will not work with system functions, such as ipcBeginProcess. I doubt that you can (or would want to) hijack these commands directly.
Dave Elder
Tait Electronics
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Forums > Silicon-package-board > Shared code - SKILL > Override or hook read-only function - how?


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