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using cdata in python
by Mathieu Malaterre-4
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Hi there,
I cannot understand how to use cdata to do this simple task. Let say I have this class: class A { public: unsigned int GetLength(); void GetBuffer(char *strout); }; In C++ you would use it this way: A a; char *buffer = new char[a.GetLength()]; a.GetBuffer(buffer); I would like that it behave juste like python: readlines() function. It should return the properly allocated string as a PyString (may contains NULL character). Thanks a bunch ! -- Mathieu ------------------------------------------------------------------------- This SF.net email is sponsored by the 2008 JavaOne(SM) Conference Don't miss this year's exciting event. There's still time to save $100. Use priority code J8TL2D2. http://ad.doubleclick.net/clk;198757673;13503038;p?http://java.sun.com/javaone _______________________________________________ Swig-user mailing list Swig-user@... https://lists.sourceforge.net/lists/listinfo/swig-user |
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Re: using cdata in python
by Mathieu Malaterre-4
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Hi Jose,
Here is what I tried: %extend gdcm::Image { %cstring_output_allocate_size(char **buffer, unsigned int *size, free(*$1) ); void my_get_data(char **buffer, unsigned int *size) { *size = self->GetBufferLength(); *buffer = (char*)malloc(*size); self->GetBuffer(*buffer); } When I call it from my python shell I am getting: >>> i=r.GetImage() >>> i.my_get_data() Traceback (most recent call last): File "<stdin>", line 1, in ? File "gdcm.py", line 1138, in my_get_data def my_get_data(*args): return _gdcm.Image_my_get_data(*args) TypeError: Image_my_get_data() takes exactly 3 arguments (1 given) >>> What I am doing wrong ? Thanks again -Mathieu On Sun, May 4, 2008 at 7:46 PM, Jose Luna <j-luna@...> wrote: > See: %cstring_output_allocate_size(parm, szparm, release) > > Here: http://www.swig.org/Doc1.3/Library.html#Library_nn12 > > This worked will for me (in python) when I needed to return binary data as a string. > > JLuna > > > > ----- Original Message ---- > From: Mathieu Malaterre <mathieu.malaterre@...> > To: swig-user@... > Sent: Sunday, May 4, 2008 11:44:58 AM > Subject: [Swig-user] using cdata in python > > Hi there, > > I cannot understand how to use cdata to do this simple task. Let say > I have this class: > > class A > { > public: > unsigned int GetLength(); > void GetBuffer(char *strout); > }; > > In C++ you would use it this way: > > A a; > char *buffer = new char[a.GetLength()]; > a.GetBuffer(buffer); > > I would like that it behave juste like python: readlines() function. > It should return the properly allocated string as a PyString (may > contains NULL character). > > Thanks a bunch ! > > -- > Mathieu > > ------------------------------------------------------------------------- > This SF.net email is sponsored by the 2008 JavaOne(SM) Conference > Don't miss this year's exciting event. There's still time to save $100. > Use priority code J8TL2D2. > http://ad.doubleclick.net/clk;198757673;13503038;p?http://java.sun.com/javaone > _______________________________________________ > Swig-user mailing list > Swig-user@... > https://lists.sourceforge.net/lists/listinfo/swig-user > > > > > > ____________________________________________________________________________________ > Be a better friend, newshound, and > know-it-all with Yahoo! Mobile. Try it now. http://mobile.yahoo.com/;_ylt=Ahu06i62sR8HDtDypao8Wcj9tAcJ > -- Mathieu ------------------------------------------------------------------------- This SF.net email is sponsored by the 2008 JavaOne(SM) Conference Don't miss this year's exciting event. There's still time to save $100. Use priority code J8TL2D2. http://ad.doubleclick.net/clk;198757673;13503038;p?http://java.sun.com/javaone _______________________________________________ Swig-user mailing list Swig-user@... https://lists.sourceforge.net/lists/listinfo/swig-user |
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Re: using cdata in python
by Paul Melis-6
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Not sure if the %cstring_output_allocate_size constructs works on
methods (the documentation seems to mention only functions). How about : %extend gdcm::Image { PyObject* my_get_data() { PyObject* res; unsigned int size = self->GetBufferLength(); buffer = (char*)malloc(size); self->GetBuffer(*buffer); // this will make a copy of buffer res = PyString_FromStringAndSize(buffer, size); free(buffer); return res; } } It's not optimal, as a thrown-away copy of the data is made... Paul Mathieu Malaterre wrote: > Hi Jose, > > Here is what I tried: > > %extend gdcm::Image > { > %cstring_output_allocate_size(char **buffer, unsigned int *size, free(*$1) ); > void my_get_data(char **buffer, unsigned int *size) { > *size = self->GetBufferLength(); > *buffer = (char*)malloc(*size); > self->GetBuffer(*buffer); > } > > When I call it from my python shell I am getting: > > >>>> i=r.GetImage() >>>> i.my_get_data() >>>> > Traceback (most recent call last): > File "<stdin>", line 1, in ? > File "gdcm.py", line 1138, in my_get_data > def my_get_data(*args): return _gdcm.Image_my_get_data(*args) > TypeError: Image_my_get_data() takes exactly 3 arguments (1 given) > > > What I am doing wrong ? > Thanks again > -Mathieu > > On Sun, May 4, 2008 at 7:46 PM, Jose Luna <j-luna@...> wrote: > >> See: %cstring_output_allocate_size(parm, szparm, release) >> >> Here: http://www.swig.org/Doc1.3/Library.html#Library_nn12 >> >> This worked will for me (in python) when I needed to return binary data as a string. >> >> JLuna >> >> >> >> ----- Original Message ---- >> From: Mathieu Malaterre <mathieu.malaterre@...> >> To: swig-user@... >> Sent: Sunday, May 4, 2008 11:44:58 AM >> Subject: [Swig-user] using cdata in python >> >> Hi there, >> >> I cannot understand how to use cdata to do this simple task. Let say >> I have this class: >> >> class A >> { >> public: >> unsigned int GetLength(); >> void GetBuffer(char *strout); >> }; >> >> In C++ you would use it this way: >> >> A a; >> char *buffer = new char[a.GetLength()]; >> a.GetBuffer(buffer); >> >> I would like that it behave juste like python: readlines() function. >> It should return the properly allocated string as a PyString (may >> contains NULL character). >> >> Thanks a bunch ! >> >> -- >> Mathieu >> >> ------------------------------------------------------------------------- >> This SF.net email is sponsored by the 2008 JavaOne(SM) Conference >> Don't miss this year's exciting event. There's still time to save $100. >> Use priority code J8TL2D2. >> http://ad.doubleclick.net/clk;198757673;13503038;p?http://java.sun.com/javaone >> _______________________________________________ >> Swig-user mailing list >> Swig-user@... >> https://lists.sourceforge.net/lists/listinfo/swig-user >> >> >> >> >> >> ____________________________________________________________________________________ >> Be a better friend, newshound, and >> know-it-all with Yahoo! Mobile. Try it now. http://mobile.yahoo.com/;_ylt=Ahu06i62sR8HDtDypao8Wcj9tAcJ >> >> > > > > ------------------------------------------------------------------------- This SF.net email is sponsored by the 2008 JavaOne(SM) Conference Don't miss this year's exciting event. There's still time to save $100. Use priority code J8TL2D2. http://ad.doubleclick.net/clk;198757673;13503038;p?http://java.sun.com/javaone _______________________________________________ Swig-user mailing list Swig-user@... https://lists.sourceforge.net/lists/listinfo/swig-user |
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Re: using cdata in python
by Mathieu Malaterre-4
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On Mon, May 5, 2008 at 5:18 PM, Jose Luna <j-luna@...> wrote:
> Mathieu, > > > >From your other thread, I got the impression that this issue was resolved and you now have it working. Is that the case? oooops, sorry. Indeed I forgot to close the thread. I was missing the %include "cstring.i". %cstring_output_allocate_size seems to be working like a charm. Thanks again ! -- Mathieu ------------------------------------------------------------------------- This SF.net email is sponsored by the 2008 JavaOne(SM) Conference Don't miss this year's exciting event. There's still time to save $100. Use priority code J8TL2D2. http://ad.doubleclick.net/clk;198757673;13503038;p?http://java.sun.com/javaone _______________________________________________ Swig-user mailing list Swig-user@... https://lists.sourceforge.net/lists/listinfo/swig-user |
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