ImagePro>Re: Can a IPBasic macro call a Macro made with the SDK?

[Stan Voynick <svoynick[at]selmar.com>]

Kevin Ryan wrote:
> 
> Normally we don't recommend calling macros from C/C++ code. There's 
> no guarantee that the appropriate macro is available! 

... but there are occasionally cases where it might be useful.  I had coded
an application in a plug-in, but I wanted to give my (relatively
sophisticated) end-user some the ability to reprogram one particular part of
the process, so at the appropriate place in my "C" code, I inserted a call
to a pre-defined script file and macro name.  That kept most of the process
in fast, efficient C-code, but still gave the user the flexibility to
experiment and change the process in the desired way.


#############################################################
##################  "C" code  ###############################

char szScriptFile[_MAX_PATH];
char szNUCMacroFile[512];

// get the existing script file name so it can be restored

::SendMessage(hWndApp, MCM_PLUGIN, PLUGM_GETSCRIPTNAME, (LPARAM) (LPSTR)
szScriptFile);

// we specified that the user-modifiable script must be
// in the IPWin install directory, so we get that and 
// append the pre-defined script file name to it

ret = IpAppGet(GETAPPDIR, 0, szNUCMacroFile);
strcat(szNUCMacroFile,"UserScript.scr");

ret = IpMacroRun("UserMacro",szNUCMacroFile);

if ( ret )
{
   sprintf(str,"problem running script; return code %d",ret);
   ::MessageBox(hWndApp,str,"User Macro",MB_OK);
}

// reload previous macro file, to leave things as we found them
ret = IpMacroLoad(szScriptFile);

#############################################################

   In another application, I used the PLUGM_GETMACROCOUNT followed by a loop
of PLUGM_GETMACRONAME calls to enumerate the list of currently available
macros in a certain file.  Then I was able to provide a drop-down list box
in a dialog to let the user pick a macro that he/she wanted to execute at a
particular spot.

   Bottom line: either way, if you do error checking (checking the return
value of IpMacroRun), you can provide a "graceful" failure mode so that
things don't have to crash if a macro is not available.  You could even set
it up so that if the macro is available, it gets run, but if it's not, you
have some section of "default" C-Code that executes instead.  This way, you
can provide for customizability, but it keeps operating transparently if the
user chooses not to provide a customized macro.

Regards,

   - Stan -

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