ImageMagickObject seems to be non-responsive

[magusxion]

I've used the code from MagicCMD.cpp to create a small test app that bascially removes all command options except for Identify and Convert.

The function calls are succeeding without errors, however I am not getting a result from the function calls to Identify.

Input args are:
identify "path_to_image.png" -format "%x x %y"

Please note that the only changes I have made from the code in MagicCMD.cpp is that I am #importing the dll instead of the tlb... and I have removed all other commands from the struct and from the code below. The only commands that remain are Identify and Convert.

The purpose is to nab the density of the image, and using convert to resize to a percentage of the current density.
I figured I would try some sanity tests with just Identify to start though.

For reference, I am using Visual Studio 2008 as my dev studio. OS is Windows, but that is obvious

Any advice or pointers are welcome, thanks in advance

Code snippet in question is as follows:

Code: Select all

int main(int argc, char* argv[])
{
  int
    index,
    status = 0;

  char
    *name;

  CommandType
    code = cmdUnknown;

  // We must have at least a command, input, and output
  if (argc < 4)
    return 0;

  index = 1;
  while ((name = Commands[index].name))
  {
    if (stricmp(name,argv[1]) == 0)
    {
      code = Commands[index].code;
      break;
    }
    index++;
  }
  if (code == cmdUnknown)
    return 0;

  CoInitialize(NULL);

  try
  {
    CComVariant
      result;

    SAFEARRAY
      **ppsa = (SAFEARRAY**) NULL;

    IMagickImagePtr pImageProc(__uuidof(MagickImage));
    if (pImageProc == NULL)
      status = 1;
    else
    {
      {
        // Define the array bound structure
        CComSafeArrayBound bound[1];
        bound[0].SetCount(argc-2);
        bound[0].SetLowerBound(0);
        CComSafeArray<VARIANT> args(bound);
        if( !args )
          status = 2;
        else
        {
          for(index = 2; index < argc; ++index)
          {
            CComVariant vt(argv[index]);
            HRESULT hr = vt.Detach(&args[index-2]);
          }
          switch(code)
          {
            case cmdConvert:
              result = pImageProc->Convert(args.GetSafeArrayPtr());
              break;
            case cmdIdentify:
              result = pImageProc->Identify(args.GetSafeArrayPtr());
              break;
          }
          pImageProc.Release();
        }
      }
    }
  }
  catch(_com_error ex)
  {
    HRESULT
      res = ex.Error();  

    _bstr_t
      desc = ex.Description();  

    printf("Error %s (0x%08x)\n",(char *)desc,res);
    status = 4;
  }

  CoUninitialize();
  return status;
}

[magusxion]

So I tested the compiled version of MagicCMD that came with the installation and I receive no output from it when giving it commands either. Figured I would do this to make sure it wasn't just the version of the code I'm working with. I've reinstalled ImageMagick and retested with the same results.

Are there tests for the COM object somewhere that I can run locally to verify if my install is just broken?

I've run the vb scripts and it seems to work fine for vb, just not c++.