I finally got it. There was nothing wrong with what I was doing at all,
but the file I was using was a corrupted file. Out of all of the files
I could have picked to test with, I picked the bad one. Go figure.
Anyway, it now works. If anyone is wandering here is some sample code:
std::string me = "blobStream";
pqxx::work w(*atr->getConn(),me);
pqxx::ilostream s(w, 137396407);
ofstream file("test2.seqb", ofstream::binary|ios::trunc);
long size;
char * buffer(0);
cout << "Streaming blob into a file " << endl;
if(s.good())
{
s.seekg (0, pqxx::ilostream::end); //position stream pointer to
end of stream
size = s.tellg(); //use this to get the size
cout << "SIZE OF LOSTREAM " << size << endl;
s.seekg(0, pqxx::ilostream::beg); //reposition back to beginning
buffer = new char [size];
s.read (buffer, size);
file.write(buffer,size);
delete[] buffer;
file.close();
}
Jeroen T. Vermeulen wrote:
> On Thu, September 6, 2007 05:44, Shannon Allen wrote:
>
>> Update:
>>
>> Getting closer. I can now get the size of the lostream and it matches
>> the size of the file before I put it into the BLOB. The problem I'm
>> having now is when I go to write the lostream back out to a file, in
>> Linux whenever I do a cmp originalfile newfile, it says that they are
>> different ("differ: byte 2590721, line 35"). But the sizes match
>> exactly. Anyone have any idea??
>>
>
> Hmm... Unwanted encoding conversion maybe? This stuff has long been
> flushed out of my mental cache, but maybe the LO stream classes need to
> add an ios::binary option somewhere. :-/
>
>
> Jeroen
>
>
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