Amiga Computing - Commodore Is Awesome

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Paul Overaa starts work on a date stamping utility Over the next two months I'm going to turn the skeleton code provided on the February coverdisk (or on our Web site) ^^^B into a utility that will run in Workbench that can extract date stamps (in ASCII form) from all files in a given directory. There are plenty of uses for such a program but the one I have in mind is one which will allow easy date stamping of Web pages. If, for example, you check out my corner of Amiga Computing's Web site you will see all pages have a last updated date stamp in them. These dates are in fact generated automatically by a utility currently written in C, but I thought a directly coded 680x0 version might be useful for the purposes of this column because, once you've seen the ideas involved, you'll realise that the same framework can be used to create many other utilities. The starting point for the discussions is the DirHandler() routine whose main job at the moment (if we disregard the temporary print/clear name operations) is to copy the selected directory name from the asl requester. Copying is usually done so a selected filename can be added to a directory to produce a complete path for the file. For our current application however, being only interested in drawer names, we can eliminate the copying and use the asl requester's own directory buffer. This approach involves some minor changes in that the text pointers of the intuiText structures cannot now be defined using the original static dimame reference. Instead we install the pointers at run time (after the internal asi buffers have been allocated). The new method, which you'll find in my AllocFileReqO routine, is to load aO with the asl requester base and load ai with each IntuiText base in turn to copy the pointers using indirect addressing instruc tions like this: ■0«.l frJrauer(aO),it_lTeJt(a1) These and a few other minor alterations - such as adding an image to the display using the Intuition Drawlmage() function and changing the window and menu text - will be easy enough to recognise by comparing this month's source with that from the previous issue. The real work however, involves extending the DirHandlerO routine so it can search the named directory and locate any files present. Dos Operations Once a directory name is available the directory must be locked using the Dos library LockO func tion. An FIB (File Info Block) must also be allocated using AlIocDosObject() and it's initial directory val ues set by calling Examine(). An ExNextO loop can then be used to examine all the files in the select ed directory. The easiest way to explain the relationship Amiga Computing MARCH 1997 DirHandler .deallocate .t»it rts StampOnIT! movem.l lea tfO-d5/iO-a2/a5,-
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