在我们编写远程控制软件的时候，我们会发现要想解锁server端我们就得发送这三个键的虚拟。
下面我说一下解决过程
1.一开始，决定通过keybd_event()来模拟键盘
keybd_event(VK_CONTROL,MapVirtualKey(VK_CONTROL,0),0,0);
keybd_event(VK_MENU,MapVirtualKey(VK_MENU,0),0,0);
keybd_event(VK_DELETE,MapVirtualKey(VK_DELETE,0),0,0);
keybd_event(VK_DELETE,MapVirtualKey(VK_DELETE,0),KEYEVENTF_KEYUP,0);
keybd_event(VK_MENU,MapVirtualKey(VK_MENU,0),KEYEVENTF_KEYUP,0);
keybd_event(VK_CONTROL,MapVirtualKey(VK_CONTROL,0),KEYEVENTF_KEYUP,0);
发现只能模拟ctrl+alt两个键的效果，然而其他的两个键的都可以模拟比如win+d。不知道是不是keybd_event()只能模拟两键还是因为
ctrl+alt+delete的特殊性，望高手告之，在此谢过。
2.运用PostMessage(HWND_BROADCAST, WM_HOTKEY, 0, MAKELONG(MOD_ALT | MOD_CONTROL, VK_DELETE));来发送虚拟键盘，但是在winNT以后的系统里我们还有很多事情要做，比如：OpenDesktop()、OpenInputDesktop()、GetThreadDesktop()、SetThreadDesktop()、CloseDesktop()、GetUserObjectInformation()
代码如下：
#include "windows.h"
BOOL simulateAltControlDel();
void main()
{
simulateAltControlDel();
}
BOOL simulateAltControlDel()
{
HDESK hdeskCurrent;
HDESK hdesk;
HWINSTA hwinstaCurrent;
HWINSTA hwinsta;
//
// Save the current Window station
//
hwinstaCurrent = GetProcessWindowStation();
if (hwinstaCurrent == NULL)
return FALSE;
//
// Save the current desktop
//
hdeskCurrent = GetThreadDesktop(GetCurrentThreadId());
if (hdeskCurrent == NULL)
return FALSE;
//
// Obtain a handle to WinSta0 - service must be running
// in the LocalSystem account
//
hwinsta = OpenWindowStation("winsta0", FALSE,
WINSTA_ACCESSCLIPBOARD |
WINSTA_ACCESSGLOBALATOMS |
WINSTA_CREATEDESKTOP |
WINSTA_ENUMDESKTOPS |
WINSTA_ENUMERATE |
WINSTA_EXITWINDOWS |
WINSTA_READATTRIBUTES |
WINSTA_READSCREEN |
WINSTA_WRITEATTRIBUTES);
if (hwinsta == NULL)
return FALSE;
//
// Set the windowstation to be winsta0
//
if (!SetProcessWindowStation(hwinsta))
return FALSE;
//
// Get the default desktop on winsta0
//
hdesk = OpenDesktop("Winlogon", 0, FALSE,
DESKTOP_CREATEMENU |
DESKTOP_CREATEWINDOW |
DESKTOP_ENUMERATE |
DESKTOP_HOOKCONTROL |
DESKTOP_JOURNALPLAYBACK |
DESKTOP_JOURNALRECORD |
DESKTOP_READOBJECTS |
DESKTOP_SWITCHDESKTOP |
DESKTOP_WRITEOBJECTS);
if (hdesk == NULL)
return FALSE;
//
// Set the desktop to be "default"
//
if (!SetThreadDesktop(hdesk))
return FALSE;
PostMessage(HWND_BROADCAST,WM_HOTKEY,0,MAKELPARAM(MOD_ALT|MOD_CONTROL,VK_DELETE));
//
// Reset the Window station and desktop
//
if (!SetProcessWindowStation(hwinstaCurrent))
return FALSE;
if (!SetThreadDesktop(hdeskCurrent))
return FALSE;
//
// Close the windowstation and desktop handles
//
if (!CloseWindowStation(hwinsta))
return FALSE;
if (!CloseDesktop(hdesk))
return FALSE;
return TRUE;
}
偶一开始试验了发现不成功，后来冰河大哥告诉我说OpenDesktop("Winlogon", ......)本身需要LocalSystem权限，
果然如此，把它注册成服务，然后效果实现。相信如何注册成服务不用我说了吧。ok，我们想要的功能实现了。
3.还有一种方法
Dos下键盘的完全控制 ------- 一系列的BIOS级别的键盘控制函数！
http://dev.csdn.net/develop/article/7/7181.shtm
我没有试验，不知道可否，哪位大哥试验后告诉我一声
在此再次感谢黄鑫大哥！！