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Message-ID:	<BC36CED13C6AD311BF040008C75D2D5A021E02B1@esekint102.ki.sw.ericsson.se>
From:	"Kenneth Sandberg (ERA)" <Kenneth DOT Sandberg AT era DOT ericsson DOT se>
To:	"'cygwin AT sourceware DOT cygnus DOT com'" <cygwin AT sourceware DOT cygnus DOT com>
Subject:	Problems using a DLL created with GNU from Microsoft VC++
Date:	Tue, 8 Aug 2000 17:54:26 +0200
MIME-Version:	1.0
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X-OriginalArrivalTime:	08 Aug 2000 15:54:47.0003 (UTC) FILETIME=[FA0532B0:01C00150]

I am trying to use a DLL created with cygwin g++ from an application created with Microsoft Visual C++. The reason is that I have C-code (huge) that is created for GNU and would like to use it in an application that requires Microsoft Visual C++.

This is what I have done:
 - I started with the example described in http://sources.redhat.com/cygwin/building-reloc-dlls.txt.

 - I changed the main-file to load the DLL:
	// Main file to try linking with a DLL under GNUwin32
	#include <windows.h>
	#include <stdio.h>

	typedef int (*doit)(int);
	typedef int (*doittoo)(int);

	int
	main()
	{
	   HINSTANCE hinstLib;
	   doit      doitPROC;
	   doittoo   doittooPROC;
	   int       x;

	   printf("main3.c\n");

	   //--- LOAD LIB ---
	   hinstLib = LoadLibrary("fooB.dll");
	   if (hinstLib == NULL) {
	      printf("Error loading DLL!\n");
	      exit(0);
	      }

	   //--- LOCATE FUNCTIONS ---
	   doitPROC = (doit)GetProcAddress(hinstLib,"doit__Fi");
	   if (doitPROC == NULL) {
	      printf("Can't locate doit()!\n");
	      exit(0);
	      }
	   doittooPROC = (doittoo)GetProcAddress(hinstLib,"doittoo__Fi");
	   if (doittooPROC == NULL) {
	      printf("Can't locate doittoo()!\n");
	      exit(0);
	      }

	   x = (doitPROC)(5);
	   printf("doit(5) returns %d\n",x);

	   x = (doittooPROC)(5);
	   printf("doittoo(5) returns %d\n",x);

	}

 - Compiled the code above with g++ main3.c -o main3.exe.  This works fine! Same result as before.

 - Compiled the code with Microsoft Visual C++ (unchanged). It compiles OK but it doesn't work. The message "Unhandled exception in main3.exe (NTDLL.DLL): 0xC000005: Access Violation." shows up. The Call Stack looks like this:
	NTDLL! 77f6cde6()
	NTDLL! 77f67506()
	CYGWIN1! 6101edff()
	CYGWIN1! 61047a6e()
	CYGWIN1! 61077304()
	CYGWIN1! 610774bb()
	CYGWIN1! 61073560()
	CYGWIN1! 6106f684()
	FOOB! 1000102b()
	main() line 38 + 7 bytes
	mainCRTStartup() line 206 + 25 bytes
	KERNEL32! 77f1ba3c()

I am running cygwin (latest release, I made a fresh install this morning) with Windows NT 4. Any suggestions?

/ Kenneth Sandberg  (Kenneth DOT Sandberg AT era DOT ericsson DOT se)



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