使用TWebBrowser时存在内存泄漏问题的解决方案（使用SetProcessWorkingSetSize函数，或者修改OleCtrls.pas源码解决问题）

弃而不舍的zhongs终于找到问题的所在，未经验证，抄袭如下：

把TWebBrowser= class(TOleControl)修改为TWebBrowser= class(TrsOleControl)

unit rsOleCtrls;

interface
uses
  OleCtrls;

type
  TrsOleControl = class (TOleControl)
  protected
    function GetIDispatchProp(Index: Integer): IDispatch;
    function GetIUnknownProp(Index: Integer): IUnknown;
  end;

implementation

{ TOleControlFix }

function TrsOleControl.GetIDispatchProp(Index: Integer): IDispatch;
var
  Temp: TVarData;
begin
  GetProperty(Index, Temp);
//  Result := IDispatch(Temp.VDispatch);       *****  Change to:
  Pointer(Result) := Temp.VDispatch;    //this avoids the extra AddRef
end;

function TrsOleControl.GetIUnknownProp(Index: Integer): IUnknown;
var
  Temp: TVarData;
begin
  GetProperty(Index, Temp);
//  Result := IDispatch(Temp.VUnknown);       *****  Change to:
  Pointer(Result) := Temp.VUnknown;    //this avoids the extra AddRef
end;

end.

另一种修改源文件的方法如下：
zhongs建议在TWebBrowser和TOleControl的继承关系中间加入一个修正此问题的中间类...
但是经我观察, 我认为TOleControl存在的缺陷会广泛波及其它既有的和将来可能有的自动化控件, 所以我的建议是对OleCtrls.pas进行如下修改: 
function TOleControl.GetIDispatchProp(Index: Integer): IDispatch;
var
  Temp: TVarData;
begin
  GetProperty(Index, Temp);
  //Result := IDispatch(Temp.VDispatch);
  Pointer(Result) := Temp.VDispatch;
end;


function TOleControl.GetIUnknownProp(Index: Integer): IUnknown;
var
  Temp: TVarData;
begin
  GetProperty(Index, Temp);
  //Result := IUnknown(Temp.VUnknown);
  Pointer(Result) := Temp.VUnknown;
end;


并且要记住重新编译OleCtrls.pas

相关链接：
http://blog.csdn.net/ScriptBaby/archive/2007/05/20/1618486.aspx
http://blog.csdn.net/ScriptBaby/article/details/1618486

 

http://blog.csdn.net/nhconch/article/details/7336192