[vtkusers] JPEGImageWriter to memory (C++)

[David E DeMarle]

Try:
char *data = (char*)d->GetVoidPointer();
size_t size = (size_t)(d->GetSize()*d->GetDataTypeSize());



David E DeMarle
Kitware, Inc.
R&D Engineer
21 Corporate Drive
Clifton Park, NY 12065-8662
Phone: 518-881-4909

On Fri, Apr 22, 2016 at 7:11 PM, Andrew Higginson <at.higginson at gmail.com>
wrote:

> Hi all,
>
>
> I am trying to use a vtkJPEGImageWriter to write a JPEG file to memory
> (instead of writing to disk and then reading it again using fopen or
> similar) in C++.
>
>
> To do this I believe I need something like the following:
>
> ----
> vtkSmartPointer<vtkJPEGWriter> writer =
> vtkSmartPointer<vtkJPEGWriter>::New();
> writer->SetWriteToMemory(true);
> writer->SetInputData(...);
> writer->Write();
>
> vtkUnsignedCharArray* d = writer->GetResult();
> ----
>
>
> However at this point I don't know how to extract what I need from the
> vtkUnsignedCharArray. I would like the raw bytes and size, like so:
>
>
> ----
> char* data = d->...
> size_t size = d->...
> ----
>
>
>
> But I am not sure how to do this. Any help would be greatly appreciated :)
>
>
> Thanks,
> Andrew Higginson
> --
>
> Andrew Higginson
>
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