The Evolution of a Programmer -- a bit of fun on a cold am

[David Farber <farber () central cis upenn edu>]

                    The Evolution of a 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 <stdio.h>
void main(void)
{
  char *message[] = {"Hello ", "World"};
  int i;


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


Seasoned professional
=====================
#include <iostream.h>
#include <string.h>


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(<windows.h>);
    importheader(<ole2.h>);
    importheader(<except.hxx>);
    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 <windows.h>
#include <ole2.h>
#include <stdio.h>
#include <stdlib.h>
#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 <windows.h>
#include <ole2.h>
#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 <windows.h>
#include <ole2.h>
#include <stdlib.h>
#include <string.h>
#include <stdio.h>
#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);
}