X-Recipient: archive-cygwin AT delorie DOT com X-Spam-Check-By: sourceware.org Date: Thu, 24 Jul 2008 15:26:59 -0400 From: Christopher Faylor To: cygwin AT cygwin DOT com Subject: Re: GetProcAddress Problem Message-ID: <20080724192659.GC7670@ednor.casa.cgf.cx> Reply-To: cygwin AT cygwin DOT com Mail-Followup-To: cygwin AT cygwin DOT com References: <18613133 DOT post AT talk DOT nabble DOT com> <001401c8ecd8$efd601d0$9601a8c0 AT CAM DOT ARTIMI DOT COM> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <001401c8ecd8$efd601d0$9601a8c0@CAM.ARTIMI.COM> User-Agent: Mutt/1.5.16 (2007-06-09) Mailing-List: contact cygwin-help AT cygwin DOT com; run by ezmlm Precedence: bulk List-Id: List-Unsubscribe: List-Subscribe: List-Archive: List-Post: List-Help: , Sender: cygwin-owner AT cygwin DOT com Mail-Followup-To: cygwin AT cygwin DOT com Delivered-To: mailing list cygwin AT cygwin DOT com On Wed, Jul 23, 2008 at 04:29:46PM +0100, Dave Korn wrote: >Stefano Facchetti wrote on 23 July 2008 16:17: > >> How specify in FAQ 6.16 I try to compile this code: >> >> ... >> HMODULE h = LoadLibrary("cygwin1.dll"); >> void (*init)() = GetProcAddress(h, "cygwin_dll_init"); >> init(); >> ... >> >> The compiler give my the following error: >> >> festivalDll.cc: In function `void festival_init()': >> festivalDll.cc:18: error: invalid conversion from `int (*)()' to `void >> (*)()' >> >> How can I do..? > > GetProcAddress returns all function pointers as if they were of type 'int >(*)()', because it has to return a pointer to some kind of function, but it >can't know what actual prototype the function has, so it uses the simplest. > > In your program, where you /know/ the actual type of the function, you >need to cast the result returned from GPA: > > void (*init)() = (void (*)()) GetProcAddress(h, "cygwin_dll_init"); ...and this really isn't a Cygwin problem. It's a combination Windows API/C comprehension problem. cgf -- Unsubscribe info: http://cygwin.com/ml/#unsubscribe-simple Problem reports: http://cygwin.com/problems.html Documentation: http://cygwin.com/docs.html FAQ: http://cygwin.com/faq/