svn_wc_prop_set4 not working as expected.

[lfdonald]

Hello,
  I'm trying to use svn_wc_prop_set4 to set a property on my local working 
copy (1.7) and I keep getting the error:

No write-lock in 'T:\VIP00192\test_1.7\LFD_Dev_14'

OS: Windows 
Compiler: visual c++
SVN package: svn-win32-1.7.5

Leslie Donaldson

Boiled down code:

    apr_pool_t*    pool = NULL;
    pool          = svn_pool_create(NULL);
    svn_fs_initialize (pool);
    svn_config_ensure (NULL, pool);
    apr_hash_t*         cfg_hash        = NULL;
    svn_config_get_config(&cfg_hash, NULL, pool);
    svn_config_t*   cfg_config = (svn_config_t *)apr_hash_get(cfg_hash, 
SVN_CONFIG_CATEGORY_CONFIG, APR_HASH_KEY_STRING);
    svn_wc_context_t*   wc_ctx      = NULL;
    svn_wc_context_create(&wc_ctx,cfg_config,result_pool,scratch_pool);

    char *  name     = "svn:externals";
 
svn_wc_prop_set4(wc_ctx,FullPath,name,&value,svn_depth_empty,FALSE,NULL,NULL,NULL,NULL,NULL,scratch_pool);

   char* FullPath = "T:/VIP00192/test_1.7/LFD_Dev_14"
   svn_string_t  value; is a list of externals.