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Learning Subversion's Client C API

From: Martin Piecyk <mpiecyk_at_gmail.com>
Date: 2006-08-17 20:53:09 CEST


I am a developer who wants to build a client application using
Subversion's C client API. Running on Windows XP, I downloaded
and http://subversion.tigris.org/files/documents/15/32473/svn-win32-1.3.2.zip
to gain access to the header files and pre-compiled static libraries.
I read the entire Subversion book located in the Windows .exe
installation (since it was newer than
http://svnbook.red-bean.com/en/1.1/index.html), including the chapter
for developers. I understand Subversion's use of APR's memory pools
and reasons for doing so and the modularized layered library design,
such as the libraries for the Repository Access and Repository layers.
Additionally, I looked read through Subversion's documentation in
http://svn.collab.net/svn-doxygen/, looking mostly at the client
functions and data types, and the APR documentation in
http://apr.apache.org/docs/apr/, http://apr.apache.org/docs/apr-util/,
and http://apr.apache.org/docs/apr-iconv/. I read through
http://subversion.tigris.org/hacking.html and a tutorial using the
client API at http://www.linuxdevcenter.com/pub/a/linux/2003/04/24/libsvn1.html
(but this uses an older version of Subversion).

However, after reading all of these documents, I still do not know how
to make a simple console application in C that does something with
Subversion such as checkout a repository into a particular directory
using a particular user name and password. I believe that in all of
the aforementioned papers I read through, none had a complete working
example written in the C or C++ language with a "main" function. I was
hoping that maybe someone knew of a tutorial that can help someone
such as myself get off to a good start with developing with the
Subversion API. Looking through the actual source code of the command
line client, svn.exe, confused me since I was not sure which lines of
code I would need for performing a simple checkout and what the
purpose of each line was.

Eventually, I found
http://svn.collab.net/repos/svn/trunk/tools/examples/, but I could not
get any of the C files to compile with Microsoft Visual C++ 6.0.
Additionally, they seemed a bit complicated to me since there were
several lines of code I wasn't sure of but no tutorial that goes
through them line by line.

Here is my error output of headrev.c, which is in the examples
directory. All of the other C files in the examples directory I
compiled had similar errors.

--------------------Configuration: subversionheadnumber - Win32
E:\subversionheadnumber\headrev.c(132) : warning C4013:
'svn_io_open_unique_file2' undefined; assuming extern returning int
E:\subversionheadnumber\headrev.c(132) : error C2065:
'svn_io_file_del_on_close' : undeclared identifier
E:\subversionheadnumber\headrev.c(132) : warning C4047: 'initializing'
: 'struct svn_error_t *' differs in levels of indirection from 'int '
Error executing cl.exe.

subversionheadnumber.exe - 1 error(s), 2 warning(s)

Does anyone know of any tutorials on using the C client API of
Subversion 1.3 or other example programs? Also, does anyone know what
my problems are with compiling the source code? I used the development
files in svn-win32-1.3.2_dev.zip to attempt to compile the source. Any
help or links would be greatly appreciated.

Best regards,

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Received on Thu Aug 17 21:11:56 2006

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