[Cppcms-users] HTTP response and binary stream (libharu)

[augustin <aug...@ov...>]

Hello,

I am asking here about returning a stream of data representing a PDF document.
I could ask the same question about returning a dynamically generated image, 
using a third party library but returning the image with a cppcms application.

I am trying to get my cppcms application to output a PDF file (using libharu).
However, I seem to have a problem returning the binary output.
It seems that the cppcms internals are corrupting the stream.


I have tested separately libharu and it works Ok.
When I integrate the code into my cppcms application, I get a corrupted file.
I am not sure which way exist to return a 

// Raw mode, returning simple HTTP headers:
        app()->response().io_mode(cppcms::http::response::io_mode_type::raw);
// content type: PDF.
        app()->response().out() << "Content-type: application/pdf\r\n";
        app()->response().out() << "\r\n";

                HPDF_Doc pdf // Create new PDF object.
                HPDF_SaveToStream (pdf); 
                std::ostringstream cppcms_buf(std::ios::binary); 

                cppcms_buf.imbue(app()->context().locale());                          

                for (;;) {
                        HPDF_BYTE buf[4096];
                        HPDF_UINT32 siz = 4096;                                       
                        HPDF_ReadFromStream (pdf, buf, &siz);
                        //app()->response().out() << buf << std::flush;               
                
                        if (siz == 0)
                                break;                                                
                        
                        cppcms_buf << buf;
                        
                }                                                                     
// Getting a cppcms::http::response:
                app()->response().out() << cppcms_buf.str();   


I don't know if Artyom is still maintaining this project. I hope that either 
he or someone else can tell me whether it's possible.

thanks,

augustin.