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void **a;
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void *a;
(*a)=NULL;

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  pp: PPointer; // £¨ÎÞÀàÐÍ£©Ö¸ÕëµÄÖ¸Õë
begin
  p := nil;
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end;

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type 
  TFunc : function() : integer;stdcall;
var FFunc : TFunc;
begin
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end;

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var
  FFunc : function() :  integer;stdcall;
begin
  @FFunc := GetProcAddress();
end;

if Assigned(fFunc) then
begin
  //...
end;


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