On Tue, 10 Feb 2009, Ken G. Brown wrote:
> I cannot seem to find the good docs for the file handling routines assign, > rewrite and reset in the pdf's that came with fpc-2.2.2. Where might the best > ones be? > I have: > User's Manual.pdf > Units Reference Guide.pdf Normally, the routines are documented here. > Programmer's Manual.pdf > Language Reference Guide.pdf > Free Component Library.pdf > Compiler Switches.pdf > Code Documented.pdf > > I would like to find good descriptions of how they work, along with error > handling and examples of how > to how to best use them. > > eg. can an internal memory based file be set to be written and read at the > same time? Yes. > Is the file read position independent of the write position? This kind of thing is not explained. > > If the internal file has been written to the end and the write operation is > finished but > the file is still open for writing, what needs to be done in order to start > reading the file from the beginning? With standard file I/O, this is not possible. > > Are streams available for reading and writing and are they preferable to > while not eof (inFi) read(inFi) > then write(outFi)? They are. > > Are exceptions useful? Yes :-) > > Examples? > > My goal is to create an internal file then dump it to a system usb printer. >From your questions, I think you're better off using TMemoryStream and class based programs. They're more flexible than the standard Pascal file I/O. > > I've found an example of writing to a pipe using assignlst (f,'|/usr/bin/lpr > -m'); that seems to sorta work, > from here: <http://ubuntuforums.org/showthread.php?t=656110>, 2nd message. > Is that a good way to do output to a printer? On linux/unix there is no other reliable way. Michael. _______________________________________________ fpc-pascal maillist - fpc-pascal@lists.freepascal.org http://lists.freepascal.org/mailman/listinfo/fpc-pascal
