[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 !
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