Dennis,
thanks for the tip on the hex. now i can see my
entry of the blob. my original loop to fill the
dynamic array with unsigned shorts was this:
imageArray = new unsigned short[10];
for(int i = 0; i < 10; i++)
imageArray[i] = i;
so now if i run the program then do a:
select imageID, hex(imageData) from Images;
i get the result:
1|0000010002000300040005000600070008000900
i am not sure where the first 2 leading zeros are
coming from but that looks to be ok.
now i need to be able to extract the data back out of
the blob with sqlite3_column_blob and
sqlite3_column_bytes so that i can repopulate an
unsigned short array.
if i have multiple blobs in the table Images how would
i go about retrieving back all this information?
somehow though i would think that i would need the
number of blob entries in the database to make this
work.
for(int i = 0; i < blob_entries; i++)
{
numBytes = sqlite3_column_bytes(statement, i);
sqlite3_column_blob(statement, i);
}
--what do you think? thanks all for the help. its
appreciated.
--- Dennis Cote <[EMAIL PROTECTED]> wrote:
> C S wrote:
> >
> > i get nothing. i have a printout statement to make
> > sure an imageID was created and it was
> successfully.
> > the array is indeed dynamic and has to be. to echo
> > this is what i have:
> >
> > myString = "insert into Images(imageID, imageData)
> > values(?, ?);
> >
> > status = sqlite3_prepare_v2(db, myString.c_str(),
> -1,
> > &statement, NULL);
> >
> > void *blob = reinterpretcast<char *>(imageArray);
> >
>
> This should be:
>
> void *blob = reinterpretcast<void *>(imageArray);
>
> > status = sqlite3_bind_blob(statement, 2, blob, 10
> *
> > sizeof(unsigned short), SQLITE_STATIC);
> >
> > statusu = sqlite3_finalize(statement);
> >
>
> You need to execute the insert statement before you
> finalize it. You
> have created and destroyed the statement, but have
> not executed it. Add
> the following between the two statements above:
>
> status = sqlite3_step(statement);
> if (status != SQLITE_OK) {
> //process error
> }
>
>
> >
> > however when i do:
> >
> > select * from Images;
> >
>
> To dump the blob data in a human readable format you
> could use the hex()
> SQL function. It will display each byte of the blob
> as two ASCII
> characters that correspond to the hexadecimal value
> of the byte.
>
> select imageID, hex(imageData) from Images;
>
> HTH
> Dennis Cote
> _______________________________________________
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> [email protected]
>
http://sqlite.org:8080/cgi-bin/mailman/listinfo/sqlite-users
>
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