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

[Mark - WBIsoft.COM]

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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