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The Evolution of a Programmer
( many ways to create your "HELLO WORLD " program)

(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 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);}

[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,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), table]
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); // ize the
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); wcsPath);}
else {
fprintf(stderr, "Object path must be specified\n"); return(1);
}
// get print string
f(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);
}