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

Mark - WBIsoft.COM mark at wbisoft.com
Sun Jul 8 19:06:04 CEST 2007


Thanks,

can you suggest the best way (ie. the correct url) for me to run with the svn.exe command to get the latest snapshot as I'm unsure where the x86_64 stuff is - esp as it would appear to have vanished from the sourceforge page ?

What's the current x86_64 snapshot version ?

Thanks

Mark

  ----- Original Message ----- 
  From: Yury Sidorov 
  To: FPC developers' list 
  Sent: Sunday, July 08, 2007 6:05 PM
  Subject: Re: [fpc-devel] LoadLibrary fails if called from a DLL


  Hi,

  I fixed DLL related a few weeks ago. You need to get more fresh snapshot and test it.

  Yury.

  ----- Original Message ----- 
  From: Mark - WBIsoft.COM 
  To: FPC developers' list 
  Sent: Sunday, July 08, 2007 7:59 PM
  Subject: Re: [fpc-devel] LoadLibrary fails if called from a DLL


  Hi Yury,

  specifically the file was lazarus-0.9.23-fpc-2.1.5-20070531-win64.exe 

  Hope this helps ?

  Mark

    ----- 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


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