PDF创建器将打印TIFF而不是PDF

我正在尝试将RTF文档转换为PDF。我有这个代码:

// TestCOMPDF.cpp : Defines the entry point for the console application.
//

#include <windows.h>
#include <tchar.h>
#include <objbase.h>
#include <atlbase.h>

#import "MSVBVM60.DLL" rename ( "EOF", "VBEOF" ), rename ( "RGB", "VBRGB" ) //if you don't use this you will be in BIG trouble
#import "PDFCreator.exe" 

int _tmain(int argc, _TCHAR* argv[])
{

 CoInitialize(NULL);
 {

  CComPtr<PDFCreator::_clsPDFCreator> pdfObject;
  HRESULT hr = pdfObject.CoCreateInstance(L"PDFCreator.clsPDFCreator");
  pdfObject->cStart("/NoProcessingAtStartup", 1);

  PDFCreator::_clsPDFCreatorOptionsPtr opt = pdfObject->GetcOptions();

  opt->UseAutosave = 1;
  opt->UseAutosaveDirectory = 1;
  opt->AutosaveDirectory = "c:\\temp\\";
  opt->AutosaveFormat = 0; // for PDF
  opt->AutosaveFilename = "gigi13";
  pdfObject->PutRefcOptions(opt);
  pdfObject->cClearCache();
  _bstr_t DefaultPrinter = pdfObject->cDefaultPrinter;
  pdfObject->cDefaultPrinter = "PDFCreator";
  hr = pdfObject->cPrintFile("c:\\temp\\RTF\\garage.rtf");

  pdfObject->cPrinterStop = false;

  while(true)
  {
   printf("sleep\n");
   Sleep(1000);
   if(pdfObject->cCountOfPrintjobs == 0)
    break;
  }

  printf("done\n");

  pdfObject->cPrinterStop = true;

  pdfObject->cDefaultPrinter = DefaultPrinter;
 }

 CoUninitialize();

 return 0;
}

当运行此代码示例而不是直接创建PDF时,它会用一个“保存”对话框提示我,该对话框只提供选择TIFF文件(不需要)的输出选项。有人能给我指出正确的方向或提出一些建议吗?

谢谢,

尤利安