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考试大论坛 考试大在线题库 unit MsgThreadUnit;
interface
uses
Classes, Windows, Messages, ComCtrls, SysUtils, Dialogs;
type
TMsgThread = class(TThread)
private
{ Private declarations }
FWinHandle: HWND;
procedure DeallocateHWnd(Wnd: HWND);
protected
procedure Execute; override;
procedure WndProc(var msg: TMessage);
public
constructor Create;
destructor Destroy; override;
property WinHandle: HWND read FWinHandle;
end;
implementation
{ THookThread }
constructor TMsgThread.Create;
begin
FreeOnTerminate := true;
FWinHandle := AllocateHWND(WndProc);
Inherited Create(false);
end;
destructor TMsgThread.Destroy;
begin
DeallocateHWnd(FWinHandle);
inherited;
end;
procedure TMsgThread.DeallocateHWnd(Wnd:HWND);
var
Instance: Pointer;
begin
Instance := Pointer(GetWindowLong(Wnd, GWL_WNDPROC));
if Instance <> @DefWindowProc then
SetWindowLong(Wnd, gwl_wndproc, LongInt(@DefWindowProc));
FreeObjectInstance(Instance);
DestroyWindow(Wnd);
end;
{这里可以根据自己需要处理的消息进行处理，所有消息都是windows的标准消息，当然也可以自定义消息，也可以使用RegisterWindowMessage注册消息，然后再在这里面使用，在这里列举了一个wm_copydata消息，是这个消息经常用于进程间的数据交换，比较难用}
procedure TMsgThread.WndProc(var msg: TMessage);
begin
if msg.Msg = WM_COPYDATA then
begin
//ProcessCopyDataMsg(msg)
end
else Msg.Result := DefWindowProc(FWinHandle, Msg.Msg, Msg.wParam, Msg.lParam);
end;
procedure TMsgThread.Execute;
begin
{ Place thread code here }
while not Terminated do
begin
sleep(10);
end;
end;
end.
责任编辑：cyth
