author | Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com> |
Fri, 22 Jan 2010 11:06:30 +0200 | |
changeset 0 | 08ec8eefde2f |
permissions | -rw-r--r-- |
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Notes about the Background Only application template |
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==================================================== |
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RCS: @(#) $Id: Background.doc,v 1.2 1998/09/14 18:40:03 stanton Exp $ |
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We have included sample code and project files for making a Background-Only |
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application (BOA) in Tcl. This could be used for server processes (like the |
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Tcl Web-Server). |
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Files: |
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------ |
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* BOA_TclShells.¼ - This is the project file. |
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* tclMacBOAAppInit.c - This is the AppInit file for the BOA App. |
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* tclMacBOAMain - This is a replacement for the Tcl_Main for BOA's. |
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Caveat: |
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------- |
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This is an unsupported addition to MacTcl. The main feature that will certainly |
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change is how we handle AppleEvents. Currently, all the AppleEvent handling is |
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done on the Tk side, which is not really right. Also, there is no way to |
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register your own AppleEvent handlers, which is obviously something that would be |
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useful in a BOA App. We will address these issues in Tcl8.1. If you need to |
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register your own AppleEvent Handlers in the meantime, be aware that your code |
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will probably break in Tcl8.1. |
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I will also improve the basic code here based on feedback that I recieve. This |
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is to be considered a first cut only at writing a BOA in Tcl. |
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Introduction: |
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------------- |
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This project makes a double-clickable BOA application. It obviously needs |
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some Tcl code to get it started. It will look for this code first in a |
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'TEXT' resource in the application shell whose name is "bgScript.tcl". If |
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it does not find any such resource, it will look for a file called |
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bgScript.tcl in the application's folder. Otherwise it will quit with an |
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error. |
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It creates three files in the application folder to store stdin, stdout & |
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stderr. They are imaginatively called temp.in, temp.out & temp.err. They |
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will be opened append, so you do not need to erase them after each use of |
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the BOA. |
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The app does understand the "quit", and the "doScript" AppleEvents, so you can |
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kill it with the former, and instruct it with the latter. It also has an |
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aete, so you can target it with Apple's "Script Editor". |
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For more information on Macintosh BOA's, see the Apple TechNote: 1070. |
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Notifications: |
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-------------- |
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BOA's are not supposed to have direct contact with the outside world. They |
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are, however, allowed to go through the Notification Manager to post |
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alerts. To this end, I have added a Tcl command called "bgnotify" to the |
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shell, that simply posts a notification through the notification manager. |
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To use it, say: |
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bgnotify "Hi, there little buddy" |
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It will make the system beep, and pop up an annoying message box with the |
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text of the first argument to the command. While the message is up, Tcl |
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is yielding processor time, but not processing any events. |
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Errors: |
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Usually a Tcl background application will have some startup code, opening |
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up a server socket, or whatever, and at the end of this, will use the |
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vwait command to kick off the event loop. If an error occurs in the |
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startup code, it will kill the application, and a notification of the error |
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will be posted through the Notification Manager. |
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If an error occurs in the event handling code after the |
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vwait, the error message will be written to the file temp.err. However, |
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if you would like to have these errors post a notification as well, just |
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define a proc called bgerror that takes one argument, the error message, |
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and passes that off to "bgnotify", thusly: |
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proc bgerror {mssg} { |
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bgnotify "A background error has occured\n $mssg" |
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} |
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Support: |
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-------- |
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If you have any questions, contact me at: |
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jim.ingham@eng.sun.com |