[fpc-devel] LoadLibrary fails if called from a DLL

Mark - WBIsoft.COM mark at wbisoft.com
Sat Jul 7 10:51:25 CEST 2007


I'm having a strange issue with the LoadLibrary call in the 64bit beta version of the free pascal compiler (fpc 2.1.5 with lazarus 0.9.23 beta) - standard install from the sourceforge download and installed in the default c:\lazarus directory.

I have written a function in FPC that I have used in Delphi for many many years with out problem.  Ok, here's a simple piece of code

function myfunction(a, var b : dword) : boolean;
var  dllh : cardinal;
      fun : function (a : dword; var b : dword) : boolean; stdcall;
   result := false;

   dllh := loadlibrary('c:\windows\system32\somelib.dll');
   if dllh <> 0 then
      fun := nil;
      fun := getprocaddress(dllh,'someproc');
      if fun <> nil then result := fun(a,b);
      result := false;

Now here's my problem - very simply if I compile this into a standard console application it works fine, however, if I compile it into the DLL I am planing to run it in it fails - the loadlibrary call ALWAYS returns 0x7C370000 which appears to be a memory address rather than a handle - the result is that the getprocaddress returns an invalid address and fails.

So, why is the loadlibrary call failing (or returning this memory address) when in a DLL but NOT when it's in a console app.

Any help would be great, as I cannot seem to find an implementation of GETLASTERROR to pass to SYSERRORMESSAGE to display any error from the OS if there is one !

Thanks folks


Kind regards

Mark Cook

Any opinions expressed in this message are those of the individual and not necessarily the company. This message and any files transmitted with it are confidential and solely for the use of the intended recipient. If you are not the intended recipient or the person responsible for delivering to the intended recipient, be advised that you have received this message in error and that any use is strictly prohibited. 

This email was scanned for viruses when sent, however we advise you to carry out your own virus check before opening any attachment(s) as we cannot accept liability for any damage sustained as a result of any software viruses.
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://lists.freepascal.org/pipermail/fpc-devel/attachments/20070707/84f15bfa/attachment.html>

More information about the fpc-devel mailing list