Coding a Dogwaffle Connection in C++

Coding a Dogwaffle Connection in C++

Postby Simon » Sun Jan 18, 2009 5:38 pm

This is not a tutorial for Curvy 3D, but rather a rare look inside Curvy's source code to help application authors link to Dogwaffle.

This example uses VOLE (open source) as a neat OLE wrapper

Code: Select all
/* VOLE Header Files */
#include <vole/vole.hpp>
/* STLSoft Header Files */
#include <comstl/util/initialisers.hpp>
#include <comstl/util/variant.hpp>
#include <winstl/error/error_desc.hpp>

// ... other headers for error reporting here ...

void TestOLE()
      TRACE("Test OLE\n");
      comstl::ole_init    coinit;

      // Start server ...
      vole::object dog = vole::object::create("Dogwaffle.Dogwaffle_Class", CLSCTX_LOCAL_SERVER, vole::coercion_level::valueCoercion);

      comstl::variant r = dog.invoke_method<comstl::variant>(L"Dog_GetRBuffer");
      comstl::variant g = dog.invoke_method<comstl::variant>(L"Dog_GetGBuffer");
      comstl::variant b = dog.invoke_method<comstl::variant>(L"Dog_GetBBuffer");
      comstl::variant a = dog.invoke_method<comstl::variant>(L"Dog_GetABuffer");

      SAFEARRAY* sa = r.parray;

      int w = dog.get_property<int>(L"Dog_BufferHeight");
      int h = dog.get_property<int>(L"Dog_BufferWidth");

      int x = (*sa).rgsabound[0].cElements;
      int y = (*sa).rgsabound[1].cElements;

      byte* R = (byte*)((*r.parray).pvData);
      byte* G = (byte*)((*g.parray).pvData);
      byte* B = (byte*)((*b.parray).pvData);
      byte* A = (byte*)((*a.parray).pvData);

      int lx = x-1;
      int ly = y-1;


      for(int j=0;j<ly;++j)
         for(int i=0;i<lx;++i)
            int p = i+j*x;
// Example filter - I normally copy Curvy's image buffers to Dogwaffle here...
            R[p] = rand()%32;
            G[p] = rand()%32;
            B[p] = rand()%32;
            A[p] = (i*256)/lx;


   catch(vole::vole_exception &x)
      cout << "error: " << x.what() << ": " << winstl::error_desc( << endl;
   catch(std::exception &x)
      cout << "error: " << x.what() << endl;

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Location: Kingston Upon Thames, U.K.

Postby donfelipe » Sun Jan 18, 2009 8:39 pm

Thanks, much appreciated.

If there are other developers looking at this code, and interested in using Dogwaffle as a framework for imaging and frame-by-frame animation or more, check the SDK and free source code snippets, most in VB but also some in Delphi, as submitted by Artweaver:

For examples of other applications who have created a plug into Dogwaffle, check

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Location: San Diego, California

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