<html xmlns:v="urn:schemas-microsoft-com:vml" xmlns:o="urn:schemas-microsoft-com:office:office" xmlns:w="urn:schemas-microsoft-com:office:word" xmlns:m="http://schemas.microsoft.com/office/2004/12/omml" xmlns="http://www.w3.org/TR/REC-html40"><head><meta http-equiv=Content-Type content="text/html; charset=us-ascii"><meta name=Generator content="Microsoft Word 12 (filtered medium)"><style><!--
/* Font Definitions */
@font-face
{font-family:"Cambria Math";
panose-1:2 4 5 3 5 4 6 3 2 4;}
@font-face
{font-family:Calibri;
panose-1:2 15 5 2 2 2 4 3 2 4;}
/* Style Definitions */
p.MsoNormal, li.MsoNormal, div.MsoNormal
{margin:0cm;
margin-bottom:.0001pt;
font-size:11.0pt;
font-family:"Calibri","sans-serif";}
a:link, span.MsoHyperlink
{mso-style-priority:99;
color:blue;
text-decoration:underline;}
a:visited, span.MsoHyperlinkFollowed
{mso-style-priority:99;
color:purple;
text-decoration:underline;}
span.E-mailStijl17
{mso-style-type:personal-compose;
font-family:"Calibri","sans-serif";
color:windowtext;}
.MsoChpDefault
{mso-style-type:export-only;}
@page WordSection1
{size:612.0pt 792.0pt;
margin:70.85pt 70.85pt 70.85pt 70.85pt;}
div.WordSection1
{page:WordSection1;}
--></style><!--[if gte mso 9]><xml>
<o:shapedefaults v:ext="edit" spidmax="1026" />
</xml><![endif]--><!--[if gte mso 9]><xml>
<o:shapelayout v:ext="edit">
<o:idmap v:ext="edit" data="1" />
</o:shapelayout></xml><![endif]--></head><body lang=NL link=blue vlink=purple><div class=WordSection1><p class=MsoNormal>Unfortunatly the proposed solutions didn’t work after all (It worked once, I think, but…)<o:p></o:p></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal>Here again the problem:<o:p></o:p></p><p class=MsoNormal>glasPng.dll is a Delphi dll with the function getPngVersion in it. Calling convention is stdCall. I want to use this dll. The code:<o:p></o:p></p><p class=MsoNormal> <o:p></o:p></p><p class=MsoNormal>{-# LANGUAGE ForeignFunctionInterface #-}<o:p></o:p></p><p class=MsoNormal>module Main(<o:p></o:p></p><p class=MsoNormal> main<o:p></o:p></p><p class=MsoNormal>)<o:p></o:p></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal>where<o:p></o:p></p><p class=MsoNormal>import Control.Monad<o:p></o:p></p><p class=MsoNormal>import Foreign.C<o:p></o:p></p><p class=MsoNormal>import Foreign.Marshal.Alloc<o:p></o:p></p><p class=MsoNormal>import Foreign.Marshal.Array<o:p></o:p></p><p class=MsoNormal>import System.Win32.Types<o:p></o:p></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal>foreign import stdcall "getPngVersion" getPngDllVersion :: IO CString<o:p></o:p></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal>main :: IO ()<o:p></o:p></p><p class=MsoNormal>main = do<o:p></o:p></p><p class=MsoNormal> s <- getPngDllVersion<o:p></o:p></p><p class=MsoNormal> putStrLn (show s)<o:p></o:p></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal>glasPng.dll is in the Windows path (I’ve checked it). <o:p></o:p></p><p class=MsoNormal>If I compile with ghc --make testGlasPng.hs –lglasPng I get: ….\ld.exe: cannot find –lglasPng. Collect 2: ld returned 1 exit status.<o:p></o:p></p><p class=MsoNormal>Ld can’t find lglasPng (with the l in front, does it trim the l?). Why? Okay I try<o:p></o:p></p><p class=MsoNormal>ghc --make testGlasPng.hs –L<path to glasPng.dll> I get:<o:p></o:p></p><p class=MsoNormal>testGlasPng.o: fake: (.text + 0x82) :undefined reference to ‘getPngVersion@0’. I think it has found the dll, but it complains the function is not in the dll. But TDump and Dll export viewer say getPngVersion is in the dll.<o:p></o:p></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal>I run ghc on a 64 bits computer. The dll is 32 bits. Is that the problem?<o:p></o:p></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal>What can I do?<o:p></o:p></p><p class=MsoNormal>Kees<o:p></o:p></p></div></body></html>