Hi
I have a bit of issue for serializing in C and deserializing it in python,
I defined a message to carry data, serialize it into array in C, then send
it over to python (via ctype).
I noticed that since the serialized array may contains 0 (zero) values, It
is better of to send as array of int to python,
otherwise truncated message would be transferred ( python expects strings
are NULL terminated ). In this case
when I receive an array of int values in python, I don't know how to
reconstruct a string from those values and feed it to ParseFromString()
because ParseFromString() does not accept array_of_int, because it does not
have len(). I can not build a string in python especially some of the
values are negative and python does not let me convert negative value to
char.
Any comment ?
Codes:
message siftOut{
message keypoint {
required float x = 1;
repeated float descr= 2 [packed=true];
}
repeated keypoint keypoints= 1;
} ;
When I filled a message such as:
siftOut vFrmDescr;
siftOut_keypoint *frmDescr = vFrmDescr.add_keypoints();
int l ;
frmDescr->set_x ( (float) k -> x );
for (l = 0 ; l < 128 ; ++l) {
frmDescr->add_descr ( (512.0 * descr [l]) ) ;
}
Then
char * charOut = new char[vFrmDescr.ByteSize()];
vFrmDescr.SerializeToArray( charOut , vFrmDescr.ByteSize());
and send it to python
in python
LIB = cdll[_loc]
LIB.protoBufFunc.argtypes =[c_char_p , c_int32 ]
LIB.protoBufFunc.restype = POINTER(c_int32)
stDescriptors = LIB.protoBufFunc( " A sample dataa in string
format " , 50 );
Now how can I use parsefromString() in python to read stDescriptors ?
Appreciate your help in advance.
Regards
Mani
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