Ben Reser wrote on Fri, Apr 05, 2013 at 22:50:04 -0700: > On Fri, Apr 5, 2013 at 10:02 PM, Bo Chen <bo.irvine.c...@gmail.com> wrote: > > I need help for the following two questions. Any help will be appreciated. > > > > 1 Given a revision number, which function can (should be in libsvn_fs_fs/) > > can read the corresponding revision from the repository (FSFS)? > > You really shouldn't be using libsvn_fs_fs directly and should use > libsvn_repos and libsvn_fs. Beyond that I really don't know what you > mean by "read the corresponding revision." There are all sorts of > APIs for getting specific information about a revision. I don't think > we have a function or a structure to represent an entire revision in > memory. Generally you get a revision root by using > svn_fs_revision_root() which gives you a svn_fs_root_t and then you > use functions against it. You may find the source for svnlook
Note that that's the svn_fs.h way of doing things, i.e., the lowest-level public API we provide. You might want to use libsvn_repos (or even libsvn_client with file:// URLs) instead, which provide different APIs (and hide the entire concept of "roots"). > > 2 For a variable of svn_stream_t, how can I print the information (e.g., the > > string) stored in this variable. > The information is not stored in the variable. svn_stream_t is an opaque struct, but if you look up its definition you'll see it only contains an svn_read_fn_t and an svn_write_fn_t. In other words, the "string" the variable represents is not stored in it. (Oh, and there are APIs for converting streams to/from svn_stringbuf_t's, which you might find useful.) Daniel > If you want something quick and dirty for debugging without worrying > about encoding you probably want to use > svn_stream_for_stdout() or svn_stream_for_stderr() to get stdout or > stderr as a stream and then use svn_stream_copy3(). > > If you need something more permanent and care about the encoding I > think you have to use the svn_cmdline_* functions, which don't take > svn_stream_t's so you'll have to consume the stream with > svn_stream_read() and then write the output with svn_cmdline_*.
