Re: issue using a dll

From:

"Igor Tandetnik" <itandetnik@mvps.org>

Newsgroups:

microsoft.public.vc.language

Date:

Wed, 13 Jun 2007 15:57:22 -0400

Message-ID:

<Og5rPUfrHHA.3492@TK2MSFTNGP02.phx.gbl>

vc-programmer <vcprogrammer@discussions.microsoft.com> wrote:

i am getting stuck in usage of the 'unzLocateFile' function. i am
loading the dll using LoadLibrary, and getting the address of the
function using GetProcAddress. Now, to use 'unzLocateFile' , i need
to typedef it. This is where i am getting stuck, a detailed
description is as under -

in unzip.h (the source of minizip), its prototype is defined as -

extern int ZEXPORT unzLocateFile OF((unzFile file, const char
*szFileName, int iCaseSensitivity));

i went looking for declaration of unzFile(its a structure)

Why do you care? Just include that header and declare your pointer as

typedef int (CALLCONV * unzLocateFile_t)(
unzFile file, const char *szFileName, int iCaseSensitivity);

Replace CALLCONV with the calling convention the function in the DLL
uses (most likely __stdcall, but you may want to make sure by figuring
out what ZEXPORT expands to).
--
With best wishes,
Igor Tandetnik

With sufficient thrust, pigs fly just fine. However, this is not
necessarily a good idea. It is hard to be sure where they are going to
land, and it could be dangerous sitting under them as they fly
overhead. -- RFC 1925