当焦点在主程序窗口时,键盘钩子就能把截获的字符传到主程序
但如果焦点不在主程序窗口时,消息传递就出问题了,
而鼠标钩子却不会出现这个问题,焦点在哪里,主程序窗口都能接收到消息
为什么??
我的目的是焦点不在主程序窗口时,主程序窗口仍能收到按键消息主程序
unit Unit1;interfaceuses
Windows, Messages, SysUtils, Variants, Classes, Graphics, Controls, Forms,
Dialogs, StdCtrls, ExtCtrls;const WM_MyMessage = WM_USER + 1;type
TForm1 = class(TForm)
procedure FormCreate(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{$R *.dfm}function SetHook; external 'MyHook.dll';
function DelHook; external 'MyHook.dll';
function SetHWnd; external 'MyHook.dll';procedure TForm1.FormCreate(Sender: TObject);
begin
FormStyle := fsStayOnTop; {为了测试, 让窗口一直在前面}
SetHook;
SetHWnd(Handle);
end;procedure TForm1.FormDestroy(Sender: TObject);
begin
DelHook;
end;{把接受到的内容显示在窗体}
procedure TForm1.MyMessage(var msg: TMessage);
begin
Text := PChar(msg.LParam);
end;end.
下面是DLL
library MyHook;uses
SysUtils,
Windows,
Messages,
Classes,
dialogs;{$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
case wParam of
WM_MOUSEMOVE : info := '鼠标位置';
WM_LBUTTONDOWN : info := '按下';
WM_LBUTTONUp : info := '放开';
end;
info := Format('%s: %d,%d', [info, PMouseHookStruct(lParam)^.pt.X, PMouseHookStruct(lParam)^.pt.Y]); {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;function KeyboardHookHandler(iCode: Integer;wParam: WPARAM;lParam: LPARAM): LRESULT; stdcall; export;
const
_KeyPressMask = $80000000;
begin Result := 0; //注释后就可以屏蔽键盘
If iCode < 0 Then
begin
Result := CallNextHookEx(hook,iCode,wParam,lParam);
Exit;
end;
if ((lParam and _KeyPressMask) = 0) then
begin
info:=chr(wparam);
PostMessage(h, WM_MyMessage, 0, Integer(PChar(info)));
end;
end;function SetHook: Boolean; stdcall;
const
WH_MOUSE_LL =14;
begin
//hook := SetWindowsHookEx(WH_MOUSE_LL, @MouseHook, HInstance, 0);
Hook :=SetWindowsHookEx(WH_KEYBOARD,@KeyboardHookHandler,HInstance,0);
Result := hook <> 0;
end;function DelHook: Boolean; stdcall;
begin
Result := UnhookWindowsHookEx(hook);
end;exports SetHook, DelHook, MouseHook, SetHWnd;
begin
end.
但如果焦点不在主程序窗口时,消息传递就出问题了,
而鼠标钩子却不会出现这个问题,焦点在哪里,主程序窗口都能接收到消息
为什么??
我的目的是焦点不在主程序窗口时,主程序窗口仍能收到按键消息主程序
unit Unit1;interfaceuses
Windows, Messages, SysUtils, Variants, Classes, Graphics, Controls, Forms,
Dialogs, StdCtrls, ExtCtrls;const WM_MyMessage = WM_USER + 1;type
TForm1 = class(TForm)
procedure FormCreate(Sender: TObject);
procedure FormDestroy(Sender: TObject);
procedure MyMessage(var msg: TMessage); message WM_MyMessage; {定义一个消息方法接受消息}
end; function SetHook: Boolean; stdcall;
function DelHook: Boolean; stdcall;
function SetHWnd(hwnd: HWND): Boolean; stdcall;var
Form1: TForm1;implementation{$R *.dfm}function SetHook; external 'MyHook.dll';
function DelHook; external 'MyHook.dll';
function SetHWnd; external 'MyHook.dll';procedure TForm1.FormCreate(Sender: TObject);
begin
FormStyle := fsStayOnTop; {为了测试, 让窗口一直在前面}
SetHook;
SetHWnd(Handle);
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
Text := PChar(msg.LParam);
end;end.
下面是DLL
library MyHook;uses
SysUtils,
Windows,
Messages,
Classes,
dialogs;{$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
case wParam of
WM_MOUSEMOVE : info := '鼠标位置';
WM_LBUTTONDOWN : info := '按下';
WM_LBUTTONUp : info := '放开';
end;
info := Format('%s: %d,%d', [info, PMouseHookStruct(lParam)^.pt.X, PMouseHookStruct(lParam)^.pt.Y]); {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;function KeyboardHookHandler(iCode: Integer;wParam: WPARAM;lParam: LPARAM): LRESULT; stdcall; export;
const
_KeyPressMask = $80000000;
begin Result := 0; //注释后就可以屏蔽键盘
If iCode < 0 Then
begin
Result := CallNextHookEx(hook,iCode,wParam,lParam);
Exit;
end;
if ((lParam and _KeyPressMask) = 0) then
begin
info:=chr(wparam);
PostMessage(h, WM_MyMessage, 0, Integer(PChar(info)));
end;
end;function SetHook: Boolean; stdcall;
const
WH_MOUSE_LL =14;
begin
//hook := SetWindowsHookEx(WH_MOUSE_LL, @MouseHook, HInstance, 0);
Hook :=SetWindowsHookEx(WH_KEYBOARD,@KeyboardHookHandler,HInstance,0);
Result := hook <> 0;
end;function DelHook: Boolean; stdcall;
begin
Result := UnhookWindowsHookEx(hook);
end;exports SetHook, DelHook, MouseHook, SetHWnd;
begin
end.
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