Suggestion for the API

[Paul TOTH]

Hello,

I'm not a C++ developer and I'm new to the project so I don't want to disturb the repository with my code...but, I've made some changes that could be interesting.

my purpose was to use libTesseract (3) from a Delphi application.

first change, I've added a function to deal with in-memory image.

TESS_API BOOL  TESS_CALL TessBaseAPIProcessPagesData(TessBaseAPI* handle, const unsigned char* imagedata, int imagesize, ETEXT_DESC* monitor, TessResultRenderer* renderer);

the code is almost the same as for stdin but with provided imagedata and with a monitor to handle progression.

then I'de like to add my own output handler so I've added this function

typedef int(*WRITE_FUNC)(void* sender, const char* data, int size);

TESS_API void TESS_CALL TessResultRendererWriteCallback(TessResultRenderer* renderer, WRITE_FUNC writefunc, void* sender);

with just a fix on TessResultRenderer

void TessResultRenderer::AppendData(const char* s, int len) {
  int n = writefunc_ ? writefunc_(writesender_, s, len) : fwrite(s, 1, len, fout_);
  if (n != len) happy_ = false;
}

Now I am able to convert any image from a memory stream to a any kind of stream...this is usefull for database image processing.

it could be better with a source image streaming but it require more changes.

[ShreeDevi Kumar]

You can provide this info as a Pull Request in GitHub repo for easier review and search.

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