On June 17, 2005 08:05 am, Jean-Philippe Barrette-LaPierre wrote:
> On June 17, 2005 06:27 am, you wrote:
> > Hi All!
> >
> > The problem with binary files seems won't stop.
> >
> > I've got problems with binary files from any type.
> > It makes no difference if this is an image file, archive file or
> > something else...
> > Now I'm really wondering what am I making wrong?!?!?!
> >
> > Does someone have any idea?
>
> can you send the code?
>
> > Thanks in advance!
> > Ragards, Nazario.
> >
> > Jean-Philippe Barrette-LaPierre wrote:
> > > On May 14, 2005 07:22 am, Nazario Cipriani wrote:
> > >>Hi everybody.
> > >>
> > >>Seems like the problems with the binary files won't stop.
> > >>But I don't know if it's a problem due to wrong usage of the lib or
> > >> not. I think I'm doing all the right way...
> > >
> > > Hi, I'm back from vacation. Have you resolved your problem?
> > >
> > >>Well the problem is, that downloaded binary files seems to be
> > >> corrupted. Now I'm wondering why this is so.
> > >>
> > >>This is the MemoryWriterClass I'm using (same as in post "Problems
> > >>downloading binary files to memory"):
> > >>
> > >> class WriterMemoryClass
> > >> {
> > >> public:
> > >> // Helper Class for reading result from remote host
> > >> WriterMemoryClass()
> > >> {
> > >> this->m_pBuffer = NULL;
> > >> this->m_pBuffer = (char*) malloc(MAX_FILE_LENGTH * sizeof(char));
> > >> this->m_Size = 0;
> > >> };
> > >> ~WriterMemoryClass()
> > >> {
> > >> if (this->m_pBuffer)
> > >> free(this->m_pBuffer);
> > >> };
> > >> static void* Realloc(void* ptr, size_t size)
> > >> {
> > >> if(ptr)
> > >> return realloc(ptr, size);
> > >> else
> > >> return malloc(size);
> > >> };
> > >> // Callback must be declared static, otherwise it won't link...
> > >> static size_t WriteMemoryCallback(char* ptr, size_t size, size_t
> > >>nmemb, void* data)
> > >> {
> > >> // Calculate the real size of the incoming buffer
> > >> size_t realsize = size * nmemb;
> > >>
> > >> // Cast the void* data pointer to WriterMemoryClass...
> > >> WriterMemoryClass* Memory = (WriterMemoryClass*) data;
> > >>
> > >> // (Re)Allocate memory for the buffer
> > >> Memory->m_pBuffer = (char*) Memory->Realloc(Memory->m_pBuffer,
> > >>Memory->m_Size + realsize + 1);
> > >>
> > >> // Test if Buffer is initialized correctly & copy memory
> > >> if (Memory->m_pBuffer)
> > >> {
> > >> memcpy(&(Memory->m_pBuffer[Memory->m_Size]), ptr, realsize);
> > >> Memory->m_Size += realsize;
> > >> Memory->m_pBuffer[Memory->m_Size] = 0;
> > >> }
> > >>
> > >> // return the real size of the buffer...
> > >> return realsize;
> > >> };
> > >>
> > >> // Public member vars
> > >> char* m_pBuffer;
> > >> size_t m_Size;
> > >> };
> > >>
> > >>For ASCII files all works fine.
> > >>But the same code doesn't seem to work for binary files.
> > >>
> > >>I've tried downloading a zip file from host with its original size of
> > >>5kB. After revceiving it with the class posted above I write the buffer
> > >>to disk with
> > >>
> > >> // Get the result...
> > >> char* Result = this->m_pConnection->GetResult();
> > >>
> > >> // Prepare the parameters for parsing...
> > >> std::stringbuf* Buffer = new std::stringbuf(Result);
> > >> std::istream* StringBuffer = new std::istream(Buffer);

I repeat: You should not use stringbuf is it's a binary file! It uses
std::basic_string.size() to get the size of the buffer! (Which look for a
ending zero)

> > >>
> > >> // Get length of buffer...
> > >> StringBuffer->seekg(std::streampos(0), std::ios_base::end);
> > >> int strLength = StringBuffer->tellg();
> > >> StringBuffer->seekg(std::streampos(0), std::ios_base::beg);
> > >>
> > >> // Parsing...
> > >> ...
> > >>
> > >> // Write out buffer (for debugging purpose)...
> > >> std::ofstream* pOutStream = new std::ofstream("<PATH>\\DWL.bin",
> > >>std::ios_base::out | std::ios_base::trunc | std::ios_base::binary);
> > >> pOutStream->write(Result, strLength);
> > >> pOutStream->close();
> > >>
> > >>Afer that its size is only 1kB!
> > >>And this happens with all binary files.
> > >>All files are just 1kB when written to disk...
> > >>
> > >>Doing the eqivalent operation for ASCII files works...
> > >>
> > >>I don't understand why this happens :-|
> > >>
> > >>Is there some magic option I must enable in order to make binary
> > >>downloads work? I don't think it's so, but maybe...
> > >>
> > >>Can someone test the Code and tell me his experience with it?
> > >>
> > >>Hoping to hear from you soon.
> > >>
> > >>Regards, Nazario.
> > >>_______________________________________________
> > >>cURLpp mailing list
> > >>cURLpp_at_rrette.com
> > >>http://www.rrette.com/mailman/listinfo/curlpp

-- 
Jean-Philippe Barrette-LaPierre
Savoir-Faire Linux
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