#include <windows.h>
HWND h;HHOOK k;UINT c=0,d=0;EVENTMSG r[500],*y;void u(){UnhookWindowsHookEx(k);
k=0;}long WINAPI p(int n,UINT w,long l){(long)y=l;switch(n){case HC_ACTION:if(c
>498)u();r[c++]=*y;break;case HC_GETNEXT:*y=r[d];break;case HC_SKIP:if(c<++d){
u();d=0;}}return CallNextHookEx(k,n,w,l);}int WINAPI WinMain(HMODULE q,HMODULE,
LPSTR,int){MSG m;if(h=CreateWindow("BUTTON","",WS_VISIBLE,0,0,50,50,0,0,q,0)){k
=SetWindowsHookEx(WH_JOURNALRECORD,&p,q,0);while(GetMessage(&m,0,0,0))switch(m.
message){case WM_CLOSE:case WM_RBUTTONDOWN:return 0;case WM_LBUTTONDOWN:if(!d)k
=SetWindowsHookEx(WH_JOURNALPLAYBACK,&p,q,0);}}}

9行！
ずっと記録し続ける（使えない）Windows用マクロ。左クリックで再生、右クリックで終了です。