delphi关于鼠标hook的问题，一直死循环。

kusosa 2022-08-30 02:25:26

我现在是想，按一次鼠标右键，执行一次操作，可是现在我的情况是，按一次鼠标，一直执行，死循环了，代码如下，烦请大神帮我看看。

DLL代码如下：

library myhook;

uses
System.SysUtils,
Windows,
Messages,
System.Classes;

{$R *.res}

const WM_MyMessage = WM_USER + 1; {自定义消息}

var
hook: HHOOK;
info: string;
h: HWND; {用作外部窗口的句柄}

{获取外部窗口的句柄}
function SetHWnd(hwnd: HWND): Boolean; stdcall;
begin
h := hwnd;
Result := True;
end;

function MouseHook(nCode: Integer; wParam: WPARAM; lParam: LPARAM): LRESULT; stdcall;
begin
begin
case wParam of
WM_rBUTTONDOWN : info := '按下';
end;
info := Format('%s', [info]);

{通过消息把数据传递给指定窗口}
PostMessage(h, WM_MyMessage, 0, Integer(PChar(info)));

Result := CallNextHookEx(hook, nCode, wParam, lParam);

end;
end;

function SetHook: Boolean; stdcall;
const
WH_MOUSE_LL =14;
begin
hook := SetWindowsHookEx(WH_MOUSE_LL, @MouseHook, HInstance, 0);
Result := hook <> 0;
end;

function DelHook: Boolean; stdcall;
begin
Result := UnhookWindowsHookEx(hook);
end;

exports SetHook, DelHook, MouseHook, SetHWnd;
begin
end.

窗体代码如下：

unit Unit1;

interface

uses
Winapi.Windows, Winapi.Messages, System.SysUtils, System.Variants, System.Classes, Vcl.Graphics,
Vcl.Controls, Vcl.Forms, Vcl.Dialogs, Vcl.StdCtrls,Vcl.ExtCtrls;

const WM_MyMessage = WM_USER + 1;

type
TForm1 = class(TForm)
Button1: TButton;
Button2: TButton;
procedure FormCreate(Sender: TObject);
procedure Button1Click(Sender: TObject);
procedure Button2Click(Sender: TObject);
procedure FormDestroy(Sender: TObject);
procedure MyMessage(var msg: TMessage); message WM_MyMessage; {定义一个消息方法接受消息}
end;

function SetHook: Boolean; stdcall;
function DelHook: Boolean; stdcall;
function SetHWnd(hwnd: HWND): Boolean; stdcall;

var
Form1: TForm1;

implementation

{$R *.dfm}

function SetHook; external 'MyHook.dll';
function DelHook; external 'MyHook.dll';
function SetHWnd; external 'MyHook.dll';

procedure TForm1.Button1Click(Sender: TObject);
begin
SetHook;
SetHWnd(Handle);
end;

procedure TForm1.Button2Click(Sender: TObject);
begin
DelHook;
end;

procedure TForm1.FormCreate(Sender: TObject);
begin
Button1.Caption := '安装钩子';
Button2.Caption := '载卸钩子';
FormStyle := fsStayOnTop; {为了测试, 让窗口一直在前面}
end;

procedure TForm1.FormDestroy(Sender: TObject);
begin
DelHook;
end;

{把接受到的内容显示在窗体}
procedure TForm1.MyMessage(var msg: TMessage);
begin
if PChar(msg.LParam)='按下' then
begin
ShowMessage('ddd'); //这里要怎么控制，让鼠标右键点击一次，执行一次，现在是死循环，一直showmessage，或者DLL里的代码要如何修改？

end;

end.

谢谢大神，非常感谢！

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