Re: File copying
On Mon, 7 Feb 2011 07:58:57 +
John Emmas john...@tiscali.co.uk wrote:
On 6 Feb 2011, at 19:05, Nader Morshed wrote:
Thanks Nader. Is this the document you mean:-
http://library.gnome.org/devel//gio/2.26/GFileInfo.html
Yep, or in particular:
http://library.gnome.org/devel/gio/2.26/GFileInfo.html#GFileInfo.description
g_file_query_info (pDestObject, G_FILE_ATTRIBUTE_STANDARD_IS_HIDDEN,
G_FILE_QUERY_INFO_NOFOLLOW_SYMLINKS,
false, error);
The API for g_file_query_info states that the 4th parameter should be a
GCancellable object or NULL, though in this case no error occurs
because false == 0 == NULL.
http://library.gnome.org/devel/gio/2.26/GFile.html#g-file-query-info
void SetHiddenAttribute (GFile* pFile, GFileInfo* pInfo, GError**
ppError) {
GError* error = NULL;
g_file_info_set_is_hidden (pinfo, true);
g_file_set_attributes_from_info (pFile, pInfo,
G_FILE_QUERY_INFO_NOFOLLOW_SYMLINKS, NULL,
error);
if (error)
g_propagate_error (ppError, error);
}
I believe you can pass ppError directly to
g_file_set_attributes_from_info() in this case, as you just copy error
over anyways, but you might want to double-check that, it otherwise
looks fine.
However, the call to g_file_set_attributes_from_info() fails with
this error:-
error code 15 : message=0x02894d80 Setting attribute
standard::is-hidden not supported
It seems that would be due to a rather crummy implementation of
GLocalFile which only handles getting the standard::is-hidden
attribute, not setting it:
http://git.gnome.org/browse/glib/tree/gio/glocalfileinfo.c#n2200
I might advise bugging your nearest glib developer to fix this :)
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Re: File copying
On 5 Feb 2011, at 19:18, Kevin DeKorte wrote:
Something like this
GFile *file;
GFileOutputStream *output;
GDataOutputStream *data;
file = g_file_new_for_uri(uri);
output = g_file_replace(file, NULL, FALSE, G_FILE_CREATE_NONE, NULL,
NULL);
data = g_data_output_stream_new((GOutputStream *) output);
if (data != NULL) {
g_data_output_stream_put_string(data, #EXTM3U\n, NULL, NULL);
g_output_stream_close((GOutputStream *) data, NULL, NULL);
}
Kevin
Thanks David and Kevin for the suggestions. That worked fine once I realised
that I could cast from GFileOutputStream* to GOutputStream*. I used the
built-in macros G_INPUT_STREAM(x) and G_OUTPUT_STREAM(x) but I think they
essentially do the same thing.
The only problem I'm having now is when I later come to copy the file
attributes and last modification time. Take a look at this code and tell me if
i'm doing something wrong
void CopyModificationtimeAndAttributes (GFileInfo* pSrcModule, GFileInfo*
pDestModule)
{
GTimeVal tvModificationTime;
gboolean bIsHidden;
g_return_if_fail (G_IS_FILE_INFO (pSrcModule));
g_return_if_fail (G_IS_FILE_INFO (pDestModule));
g_file_info_get_modification_time (pSrcModule, tvModificationTime);
g_file_info_set_modification_time (pDestModule, tvModificationTime);
/* Note this line for testing */ g_file_info_get_modification_time
(pDestModule, tvModificationTime);
/* bIsHidden = g_file_info_get_is_hidden (pSrcModule); */
/* Note this line for testing */ bIsHidden = true;
g_file_info_set_is_hidden (pDestModule, bIsHidden);
}
You can see that I specifically set the copied file to be hidden (I'm running
this under Windows 7 BTW on a FAT32 partition, so no security permissions to
worry about). Note also, that after setting the modification time I
specifically check (in my debugger) that the destination file has the correct
time, which it does.
However, if I navigate to the destination file in Windows Explorer and inspect
its properties I see that the file wasn't in fact hidden, nor does it have the
modification time I specified. Have I missed out a step? For example although
you can't see it in the above code I did flush the file contents and closed it
(after copying the data) but I only unref'd the GFileInfo pointers. I didn't
carry out any similar closing or flushing operations for the new time and
attributes. Should I have done something to actually write the changed details
to disk?
John
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Re: File copying
You need to call g_file_set_attributes_from_info() to apply your
changes to the file info (See: The Description section in the GFileInfo
gtk-docs)
I might also suggest filtering results on your query of
g_file_query_info and just using a loop to copy over all the attributes
listed by g_file_info_list_attributes(), it would allow you to add in
more fields more easily, rather than having to write new lines of code
for each new field that you decide to care about.
On Sun, 6 Feb 2011 17:04:26 +
John Emmas john...@tiscali.co.uk wrote:
On 5 Feb 2011, at 19:18, Kevin DeKorte wrote:
Something like this
GFile *file;
GFileOutputStream *output;
GDataOutputStream *data;
file = g_file_new_for_uri(uri);
output = g_file_replace(file, NULL, FALSE, G_FILE_CREATE_NONE,
NULL, NULL);
data = g_data_output_stream_new((GOutputStream *) output);
if (data != NULL) {
g_data_output_stream_put_string(data, #EXTM3U\n, NULL,
NULL); g_output_stream_close((GOutputStream *) data, NULL, NULL);
}
Kevin
Thanks David and Kevin for the suggestions. That worked fine once I
realised that I could cast from GFileOutputStream* to
GOutputStream*. I used the built-in macros G_INPUT_STREAM(x) and
G_OUTPUT_STREAM(x) but I think they essentially do the same thing.
The only problem I'm having now is when I later come to copy the file
attributes and last modification time. Take a look at this code and
tell me if i'm doing something wrong
void CopyModificationtimeAndAttributes (GFileInfo* pSrcModule,
GFileInfo* pDestModule) {
GTimeVal tvModificationTime;
gboolean bIsHidden;
g_return_if_fail (G_IS_FILE_INFO (pSrcModule));
g_return_if_fail (G_IS_FILE_INFO (pDestModule));
g_file_info_get_modification_time (pSrcModule,
tvModificationTime); g_file_info_set_modification_time (pDestModule,
tvModificationTime); /* Note this line for testing */
g_file_info_get_modification_time (pDestModule, tvModificationTime);
/* bIsHidden = g_file_info_get_is_hidden (pSrcModule); */
/* Note this line for testing */ bIsHidden = true;
g_file_info_set_is_hidden (pDestModule, bIsHidden);
}
You can see that I specifically set the copied file to be hidden (I'm
running this under Windows 7 BTW on a FAT32 partition, so no security
permissions to worry about). Note also, that after setting the
modification time I specifically check (in my debugger) that the
destination file has the correct time, which it does.
However, if I navigate to the destination file in Windows Explorer
and inspect its properties I see that the file wasn't in fact hidden,
nor does it have the modification time I specified. Have I missed
out a step? For example although you can't see it in the above code
I did flush the file contents and closed it (after copying the data)
but I only unref'd the GFileInfo pointers. I didn't carry out any
similar closing or flushing operations for the new time and
attributes. Should I have done something to actually write the
changed details to disk?
John
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Re: File copying
On 6 Feb 2011, at 19:05, Nader Morshed wrote:
You need to call g_file_set_attributes_from_info() to apply your
changes to the file info (See: The Description section in the GFileInfo
gtk-docs)
I might also suggest filtering results on your query of
g_file_query_info
Thanks Nader. Is this the document you mean:-
http://library.gnome.org/devel//gio/2.26/GFileInfo.html
If so, there's something I'm still not understanding. I've cut my example down
to some code that should set the 'hidden' attribute on a pre-existing file. I
obtain a GFile* and GFileInfo* like this:-
GFile* pDestObject = g_file_new_for_path
(path_to_my_existing_file);
GFileInfo* pDestObjectInfo = g_file_query_info (pDestObject,
G_FILE_ATTRIBUTE_STANDARD_IS_HIDDEN,
G_FILE_QUERY_INFO_NOFOLLOW_SYMLINKS,
false, error);
The above calls appear to succeed. I then pass the pointers to this function:-
void SetHiddenAttribute (GFile* pFile, GFileInfo* pInfo, GError** ppError)
{
GError* error = NULL;
g_file_info_set_is_hidden (pinfo, true);
g_file_set_attributes_from_info (pFile, pInfo,
G_FILE_QUERY_INFO_NOFOLLOW_SYMLINKS, NULL, error);
if (error)
g_propagate_error (ppError, error);
}
However, the call to g_file_set_attributes_from_info() fails with this error:-
error code 15 : message=0x02894d80 Setting attribute standard::is-hidden
not supported
I'd be happy to look at an example if you know where I can find one.
Otherwise, can you see where I'm going wrong?
Thanks,
John
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Re: File copying
On 4 Feb 2011, at 22:57, Nader Morshed wrote: you might want to take a look at GIO's GFileInfo API. It has a large array of attributes to get/set, depending on the GIOModule being used. Thanks for the tip. I've been experimenting with the GFileInfo API today but inadvertently, it's led me to something of a dead end. Remember that apart from wanting to preserve certain file attributes, my main aim was to move some files into a new folder (i.e. creating a new file or overwriting an older version, then deleting the original). g_file_replace() seems to provide a handy interface for this type of operation, since it'll allow me to overwrite a pre-existing file in the destination folder or create a new one if the destination file didn't already exist. g_file_replace() returns a GFileOutputStream* which (supposedly) I can use for writing new contents to the file. However, I've been unable to find any examples of writing to a file using a GFileOutputStream*. In fact, I can't find any read, write, flush. or, close functions that take a GFileOutputStream* as their input. What am I missing here? Am I supposed to turn my GFileOutputStream* into some other kind of stream (for example a GOutputStream*)? I've found plenty of functions for using GOutputStream but am struggling with GFileOutputStream. Thanks. John ___ gtk-app-devel-list mailing list gtk-app-devel-list@gnome.org http://mail.gnome.org/mailman/listinfo/gtk-app-devel-list
Re: File copying
On Sat, Feb 05, 2011 at 06:29:20PM +, John Emmas wrote: g_file_replace() returns a GFileOutputStream* which (supposedly) I can use for writing new contents to the file. However, I've been unable to find any examples of writing to a file using a GFileOutputStream*. In fact, I can't find any read, write, flush. or, close functions that take a GFileOutputStream* as their input. What am I missing here? Am I supposed to turn my GFileOutputStream* into some other kind of stream (for example a GOutputStream*)? I've found plenty of functions for using GOutputStream but am struggling with GFileOutputStream. GFileOutputStream is GOutputStream as can be seen in the class hierarchy: http://library.gnome.org/devel/gio/stable/GFileOutputStream.html#GFileOutputStream.object-hierarchy So you only have to use the standard typecasting macros. Yeti ___ gtk-app-devel-list mailing list gtk-app-devel-list@gnome.org http://mail.gnome.org/mailman/listinfo/gtk-app-devel-list
Re: File copying
-BEGIN PGP SIGNED MESSAGE-
Hash: SHA1
On 02/05/2011 11:29 AM, John Emmas wrote:
On 4 Feb 2011, at 22:57, Nader Morshed wrote:
you might want to take a look at GIO's GFileInfo API. It has a
large array of attributes to get/set, depending on the GIOModule being
used.
Thanks for the tip. I've been experimenting with the GFileInfo API today but
inadvertently, it's led me to something of a dead end.
Remember that apart from wanting to preserve certain file attributes, my main
aim was to move some files into a new folder (i.e. creating a new file or
overwriting an older version, then deleting the original). g_file_replace()
seems to provide a handy interface for this type of operation, since it'll
allow me to overwrite a pre-existing file in the destination folder or create
a new one if the destination file didn't already exist.
g_file_replace() returns a GFileOutputStream* which (supposedly) I can use
for writing new contents to the file. However, I've been unable to find any
examples of writing to a file using a GFileOutputStream*. In fact, I can't
find any read, write, flush. or, close functions that take a
GFileOutputStream* as their input. What am I missing here? Am I supposed to
turn my GFileOutputStream* into some other kind of stream (for example a
GOutputStream*)? I've found plenty of functions for using GOutputStream but
am struggling with GFileOutputStream. Thanks.
John
John,
Something like this
GFile *file;
GFileOutputStream *output;
GDataOutputStream *data;
file = g_file_new_for_uri(uri);
output = g_file_replace(file, NULL, FALSE, G_FILE_CREATE_NONE, NULL,
NULL);
data = g_data_output_stream_new((GOutputStream *) output);
if (data != NULL) {
g_data_output_stream_put_string(data, #EXTM3U\n, NULL, NULL);
g_output_stream_close((GOutputStream *) data, NULL, NULL);
}
Kevin
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Re: File copying
Glib has a few various functions for that, like g_chmod, g_stat, etc, but you might want to take a look at GIO's GFileInfo API. It has a large array of attributes to get/set, depending on the GIOModule being used. On Fri, 4 Feb 2011 22:51:36 + John Emmas john...@tiscali.co.uk wrote: Does glib have any functions for setting a file's attributes / creation date / last modification date etc? I need to move some files (programmatically) to a new directory whilst preserving their dates and other attributes. John ___ gtk-app-devel-list mailing list gtk-app-devel-list@gnome.org http://mail.gnome.org/mailman/listinfo/gtk-app-devel-list -- Nader Morshed morshed.na...@gmail.com ___ gtk-app-devel-list mailing list gtk-app-devel-list@gnome.org http://mail.gnome.org/mailman/listinfo/gtk-app-devel-list
