The Evolution of Programmer

High School/Jr.High

10 PRINT "HELLO WORLD"
20 END
 

First year in College

program Hello(input, output)
begin
    writeln('Hello World')
end.

 
Senior year in College

(defun hello
(print
(cons 'Hello (list 'World))))

 
New professional

#include 
void main(void)
{
   char *message[] = {"Hello ", "World"};
   int i;

   for(i = 0; i < 2; ++i)
      printf("%s", message[i]);
   printf("\n");
}

  
Seasoned professional

#include 
#include 

class string
{
private:
   int size;
   char *ptr;

public:
   string() : size(0), ptr(new char('\0')) {}

string(const string &s) : size(s.size)
{
   ptr = new char[size + 1];
   strcpy(ptr, s.ptr);
}

~string()
{
   delete [] ptr;
}

   friend ostream &operator <<(ostream &, const string &);
   string &operator=(const char *);
};

ostream &operator<<(ostream &stream, const string &s)
{
   return(stream << s.ptr);
}

string &string::operator=(const char *chrs)
{
   if (this != &chrs)
   {
      delete [] ptr;
      size = strlen(chrs);
      ptr = new char[size + 1];
      strcpy(ptr, chrs);
   }
   return(*this);
}

int main()
{
   string str;

   str = "Hello World";
   cout << str << endl;

   return(0);
}

 
Master Programmer

[uuid(2573F8F4-CFEE-101A-9A9F-00AA00342820)]
library LHello
{
   // bring in the master library
   importlib("actimp.tlb");
   importlib("actexp.tlb");

   // bring in my interfaces
   #include "pshlo.idl"

   [uuid(2573F8F5-CFEE-101A-9A9F-00AA00342820)]
   cotype THello
   {
      interface IHello;
      interface IPersistFile;
   };
};

[
   exe,
   uuid(2573F890-CFEE-101A-9A9F-00AA00342820)
]
module CHelloLib
{
   // some code related header files
   importheader();
   importheader();
   importheader();
   importheader("pshlo.h");
   importheader("shlo.hxx");
   importheader("mycls.hxx");

   // needed typelibs
   importlib("actimp.tlb");
   importlib("actexp.tlb");
   importlib("thlo.tlb");

   [
   uuid(2573F891-CFEE-101A-9A9F-00AA00342820),
   aggregatable
   ]
 
   coclass CHello
   {
      cotype THello;
   };
};


#include "ipfix.hxx"

extern HANDLE hEvent;

class CHello : public CHelloBase
{
public:
   IPFIX(CLSID_CHello);

   CHello(IUnknown *pUnk);
   ~CHello();

   HRESULT __stdcall PrintSz(LPWSTR pwszString);

private:
   static int cObjRef;
};


#include 
#include 
#include 
#include 
#include "thlo.h"
#include "pshlo.h"
#include "shlo.hxx"
#include "mycls.hxx"

int CHello::cObjRef = 0;

CHello::CHello(IUnknown *pUnk) : CHelloBase(pUnk)
{
   cObjRef++;
   return;
}
 
HRESULT __stdcall CHello::PrintSz(LPWSTR pwszString)
{
   printf("%ws\n", pwszString);
   return(ResultFromScode(S_OK));
}

CHello::~CHello(void)
{
   // when the object count goes to zero, stop the server
   cObjRef--;
   if( cObjRef == 0 )
      PulseEvent(hEvent);

   return;
}

#include 
#include 
#include "pshlo.h"
#include "shlo.hxx"
#include "mycls.hxx"

HANDLE hEvent;

int _cdecl main(
int argc,
char * argv[]
) {
   ULONG ulRef;
   DWORD dwRegistration;
   CHelloCF *pCF = new CHelloCF();

   hEvent = CreateEvent(NULL, FALSE, FALSE, NULL);

   // Initialize the OLE libraries
   CoInitializeEx(NULL, COINIT_MULTITHREADED);

   CoRegisterClassObject(CLSID_CHello, pCF, CLSCTX_LOCAL_SERVER,
   REGCLS_MULTIPLEUSE, &dwRegistration);

   // wait on an event to stop
   WaitForSingleObject(hEvent, INFINITE);

   // revoke and release the class object
   CoRevokeClassObject(dwRegistration);
   ulRef = pCF->Release();

   // Tell OLE we are going away.
   CoUninitialize();

   return(0);
}

extern CLSID CLSID_CHello;
extern UUID LIBID_CHelloLib;

CLSID CLSID_CHello = { /* 2573F891-CFEE-101A-9A9F-00AA00342820 */
0x2573F891,
0xCFEE,
0x101A,
{ 0x9A, 0x9F, 0x00, 0xAA, 0x00, 0x34, 0x28, 0x20 }
};

UUID LIBID_CHelloLib = { /* 2573F890-CFEE-101A-9A9F-00AA00342820 */
0x2573F890,
0xCFEE,
0x101A,
{ 0x9A, 0x9F, 0x00, 0xAA, 0x00, 0x34, 0x28, 0x20 }
};

#include 
#include 
#include 
#include 
#include 
#include "pshlo.h"
#include "shlo.hxx"
#include "clsid.h"

int _cdecl main(
   int argc,
   char * argv[]
) {
   HRESULT hRslt;
   IHello *pHello;
   ULONG ulCnt;
   IMoniker * pmk;
   WCHAR wcsT[_MAX_PATH];
   WCHAR wcsPath[2 * _MAX_PATH];

   // get object path
   wcsPath[0] = '\0';
   wcsT[0] = '\0';
   if( argc > 1) {
      mbstowcs(wcsPath, argv[1], strlen(argv[1]) + 1);
      wcsupr(wcsPath);
   }
   else {
      fprintf(stderr, "Object path must be specified\n");
      return(1);
   }

   // get print string
   if(argc > 2)
      mbstowcs(wcsT, argv[2], strlen(argv[2]) + 1);
   else
      wcscpy(wcsT, L"Hello World");

   printf("Linking to object %ws\n", wcsPath);
   printf("Text String %ws\n", wcsT);

   // Initialize the OLE libraries
   hRslt = CoInitializeEx(NULL, COINIT_MULTITHREADED);

   if(SUCCEEDED(hRslt)) {
      hRslt = CreateFileMoniker(wcsPath, &pmk);
      if(SUCCEEDED(hRslt))
         hRslt = BindMoniker(pmk, 0, IID_IHello, (void **)&pHello);

      if(SUCCEEDED(hRslt)) {
         // print a string out
         pHello->PrintSz(wcsT);

         Sleep(2000);
         ulCnt = pHello->Release();
      }
      else
         printf("Failure to connect, status: %lx", hRslt);

      // Tell OLE we are going away.
      CoUninitialize();
   }

   return(0);
}

# END: return programmer to real world