Dll

Sim ....
You can access routines in a DLL through direct calls to Windows library functions, including LoadLibrary, FreeLibrary, and GetProcAddress (all declared in Delphi’s Windows unit). In this case, use procedural-type variables to reference the imported routines. For example,

uses Windows, ...;
type

TTimeRec = record
Second: Integer;
Minute: Integer;
Hour: Integer;
end;

TGetTime = procedure(var Time: TTimeRec);

THandle = Integer;

var

Time: TTimeRec;
Handle: THandle;
GetTime: TGetTime;
...
begin
Handle := LoadLibrary(´DATETIME.DLL´);
if Handle <> 0 then
begin
@GetTime := GetProcAddress(Handle, ´GetTime´);
if @GetTime <> nil then
begin
GetTime(Time);
with Time do
WriteLn(´The time is ´, Hour, ´:´, Minute, ´:´, Second);
end;
FreeLibrary(Handle);
end;

end;

When you import routines this way, the DLL is not loaded until the code containing the call to LoadLibrary executes. The DLL is later unloaded by the call to FreeLibrary. This allows you to conserve memory, and to run your program even when some of the DLLs it uses are not present.


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