Convert a PDF file to PDF/A standard using C++

convert-pdf-to-pdfa.cpp

int ConvertPDFtoPDFA( WCHAR *SerialNumber, WCHAR *InputFile, WCHAR *OutputFile, int ConformStandard, BSTR *bstrErrors)
{
   //Declare Conform function 
   typedef int ( *SC_CONFORM_FILE)(WCHAR *SerialNumber, WCHAR *InputFileName, int ConformStandard, WCHAR *OutputFileName, BSTR *Errors);

  //Load scConverter.dll
   HINSTANCE hLib = LoadLibraryExW( L"scConverter.dll", nullptr, LOAD_WITH_ALTERED_SEARCH_PATH );
   if (!hLib) return -1;
   //Get Conform function pointer
   SC_CONFORM_FILE ConformFileFunc = (SC_CONFORM_FILE)GetProcAddress( hLib, "scPDFConform" );
   //Call Conform function
   int result = ConformFileFunc( SerialNumber, InputFile, ConformStandard, OutputFile, bstrErrors);
   FreeLibrary( hLib );
   return result;
}

Sample usage:
BSTR bstrErrors = nullptr;
int returnvalue = ConvertPDFtoPDFA( L"", L"input.pdf", 6, L"output.pdf", &bstrErrors ); //Conform type 6 = PDF/A-4

Take a look at the scConverter Documentation for more information.