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

Mark - WBIsoft.COM mark at wbisoft.com
Sun Jul 8 18:56:46 CEST 2007


Hi, it's the sourceforge build I downloaded some weeks ago, havnt checked the latest svn build as I'm not sure how to get that into the lazarus ide yet ?????  Any tips ?

Thanks

  ----- Original Message ----- 
  From: Yury Sidorov 
  To: FPC developers' list 
  Sent: Sunday, July 08, 2007 5:28 PM
  Subject: Re: [fpc-devel] LoadLibrary fails if called from a DLL


  Hello,

  How old is snapshot you are using?

  Yury Sidorov.

  ----- Original Message ----- 
  From: Mark - WBIsoft.COM 
  To: fpc-devel at lists.freepascal.org 
  Sent: Saturday, July 07, 2007 11:51 AM
  Subject: [fpc-devel] LoadLibrary fails if called from a DLL


  Hi,  

  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;
  begin
     result := false;

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

  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

  Mark




  Kind regards

  Mark Cook
  WBIsoft.COM


  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.


------------------------------------------------------------------------------


  _______________________________________________
  fpc-devel maillist  -  fpc-devel at lists.freepascal.org
  http://lists.freepascal.org/mailman/listinfo/fpc-devel



------------------------------------------------------------------------------


  _______________________________________________
  fpc-devel maillist  -  fpc-devel at lists.freepascal.org
  http://lists.freepascal.org/mailman/listinfo/fpc-devel



------------------------------------------------------------------------------


  No virus found in this incoming message.
  Checked by AVG Free Edition. 
  Version: 7.5.476 / Virus Database: 269.10.2/890 - Release Date: 07/07/2007 15:26
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://lists.freepascal.org/pipermail/fpc-devel/attachments/20070708/f3929176/attachment.html>


More information about the fpc-devel mailing list