方法有兩種：
1.sendmessage or postmessage
2.keybd_event,mouse_event
前者更強大，指定hwnd後可以後台傳送，而後者只能夠傳送前台資訊..也就是必須視窗最前
簡單的舉例：
方法2setcursorpos(x,y);
mouse_event(mouseeventf_leftdown,0,0,0,0);
mouse_event(mouseeventf_leftup,0,0,0,0);
keybd_event(k,0,0,0);
keybd_event(k,0,keyeventf_keyup,0);
方法1以當前程式的某個輸入框為例：
hwnd tw2 = getdlgitem(idc_edit1)->m_hwnd;
::sendmessage(tw2,wm_char,s[i],0);
是個按鈕：
hwnd tw3 = getdlgitem(idok)->m_hwnd;
::sendmessage(tw3,wm_lbuttondown,0,0);
::sendmessage(tw3,wm_lbuttonup,0,0);
以記事本為例
wnd = ::findwindow("notepad", null);
wnd = findwindowex(wnd,0,"edit",null);
::sendmessage(tw2,wm_char,s[i],0);
有人就說了，我不知道名字叫edit啊，有下面的方法：
cwnd * pwnd = findwindow("notepad", null);
cwnd * p2 = pwnd->gettopwindow();
wnd = p2->m_hwnd;
::sendmessage(tw2,wm_char,s[i],0);
又有人說了，如果連notepad也不知道呢...
我說，程序id總知道了吧...遍歷程序池得到想要的程序id，然後找到指定id的hwnd
struct enumparam
; bool callback enumwinproc(hwnd hwnd, lparam lparam)
return true;
}enumparam ep;
startupinfo si;
process_information pi;
ep.hmainwnd = null;
memset(&si, 0, sizeof(si));
si.cb = sizeof(startupinfo);
if (createprocess(null,"notepad.exe c:.txt",
null,null,false,0,null,null,&si,&pi))
//enumwindows((wndenumproc)enumwinproc, (long)&ep);
} //此時的 ep.hmainwnd 就是你要的nodepad.exe視窗的控制代碼
//接下來由hwnd得到cwnd *
wnd = ep.hmainwnd;
if(wnd == null) afxmessagebox("fasle");
cwnd * tc = fromhandle(wnd);
//獲取
wnd = tc->gettopwindow()->m_hwnd;
::sendmessage(tw2,wm_char,s[i],0);
//ok啦
遍歷程序的**下次再發了
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