【发布时间】：2015-04-27 17:54:01
【问题描述】：
using System;
using System.Diagnostics;
using System.Runtime.InteropServices;
using System.Windows.Forms;
namespace TestDesktop
{
internal class Program
{
private const int UOI_NAME = 2;
private const int NormalPriorityClass = 0x00000020;
[StructLayout(LayoutKind.Sequential)]
private struct PROCESS_INFORMATION
{
public IntPtr hProcess;
public IntPtr hThread;
public int dwProcessId;
public int dwThreadId;
}
private struct STARTUPINFO
{
public int cb;
public string lpReserved;
public string lpDesktop;
public string lpTitle;
public int dwX;
public int dwY;
public int dwXSize;
public int dwYSize;
public int dwXCountChars;
public int dwYCountChars;
public int dwFillAttribute;
public int dwFlags;
public short wShowWindow;
public short cbReserved2;
public IntPtr lpReserved2;
public IntPtr hStdInput;
public IntPtr hStdOutput;
public IntPtr hStdError;
}
[DllImport("kernel32.dll")]
private static extern bool CreateProcess(
string lpApplicationName,
string lpCommandLine,
IntPtr lpProcessAttributes,
IntPtr lpThreadAttributes,
bool bInheritHandles,
int dwCreationFlags,
IntPtr lpEnvironment,
string lpCurrentDirectory,
ref STARTUPINFO lpStartupInfo,
ref PROCESS_INFORMATION lpProcessInformation
);
[DllImport("user32.dll")]
public static extern IntPtr CreateDesktop(string lpszDesktop, IntPtr lpszDevice, IntPtr pDevmode, int dwFlags,
uint dwDesiredAccess, IntPtr lpsa);
[DllImport("user32.dll")]
private static extern bool SwitchDesktop(IntPtr hDesktop);
[DllImport("user32.dll")]
public static extern bool CloseDesktop(IntPtr handle);
[DllImport("user32.dll")]
public static extern bool SetThreadDesktop(IntPtr hDesktop);
[DllImport("user32.dll")]
public static extern IntPtr GetThreadDesktop(int dwThreadId);
[DllImport("user32.dll")]
private static extern bool GetUserObjectInformation(IntPtr hObj, int nIndex, IntPtr pvInfo, int nLength,
ref int lpnLengthNeeded);
[DllImport("kernel32.dll")]
public static extern int GetCurrentThreadId();
private enum DesktopAccess : uint
{
DesktopNone = 0,
DesktopReadobjects = 0x0001,
DesktopCreatewindow = 0x0002,
DesktopCreatemenu = 0x0004,
DesktopHookcontrol = 0x0008,
DesktopJournalrecord = 0x0010,
DesktopJournalplayback = 0x0020,
DesktopEnumerate = 0x0040,
DesktopWriteobjects = 0x0080,
DesktopSwitchdesktop = 0x0100,
GenericAll = (DesktopReadobjects | DesktopCreatewindow | DesktopCreatemenu
| DesktopHookcontrol
| DesktopJournalrecord | DesktopJournalplayback |
DesktopEnumerate | DesktopWriteobjects | DesktopSwitchdesktop),
}
public static string GetDesktopName(IntPtr desktopHandle)
{
// check its not a null pointer.
// null pointers wont work.
if (desktopHandle == IntPtr.Zero) return null;
// get the length of the name.
var needed = 0;
var name = String.Empty;
GetUserObjectInformation(desktopHandle, UOI_NAME, IntPtr.Zero, 0, ref needed);
// get the name.
var ptr = Marshal.AllocHGlobal(needed);
var result = GetUserObjectInformation(desktopHandle, UOI_NAME, ptr, needed, ref needed);
name = Marshal.PtrToStringAnsi(ptr);
Marshal.FreeHGlobal(ptr);
// something went wrong.
if (!result) return null;
return name;
}
public static void KillAllProcess(string desktopName, IntPtr hNewDesktop)
{
var processes = Process.GetProcesses();
var thisProc = Process.GetCurrentProcess();
foreach (var process in processes)
{
// check the threads of the process - are they in this one?
foreach (ProcessThread pt in process.Threads)
{
if (GetDesktopName(GetThreadDesktop(pt.Id)) == desktopName)
{
Console.WriteLine(process.ProcessName);
if (process.ProcessName != thisProc.ProcessName)
{
process.Kill();
break;
}
}
}
}
}
static void Main()
{
const string newDesktopName = "RandomDesktopName";
// old desktop's handle, obtained by getting the current desktop assigned for this thread
var hOldDesktop = GetThreadDesktop(GetCurrentThreadId());
// new desktop's handle, assigned automatically by CreateDesktop
var hNewDesktop = CreateDesktop(newDesktopName, IntPtr.Zero, IntPtr.Zero, 0, (uint)DesktopAccess.GenericAll, IntPtr.Zero);
// switching to the new desktop
SwitchDesktop(hNewDesktop);
// assigning the new desktop to this thread - so the Form will be shown in the new desktop)
SetThreadDesktop(hNewDesktop);
var si = new STARTUPINFO();
si.cb = Marshal.SizeOf(si);
si.lpDesktop = newDesktopName;
var pi = new PROCESS_INFORMATION();
// start the process.
CreateProcess(null, "explorer.exe", IntPtr.Zero, IntPtr.Zero, true, NormalPriorityClass, IntPtr.Zero, null, ref si, ref pi);
var loginWnd = new Form();
var btn = new Button { Text = "Close" };
btn.Click += (sender1, ex1) =>
{
KillAllProcess(newDesktopName, hNewDesktop);
loginWnd.Close();
SwitchDesktop(hOldDesktop);
};
loginWnd.Controls.Add(btn);
Application.Run(loginWnd);
SwitchDesktop(hOldDesktop);
CloseDesktop(hNewDesktop);
Console.ReadKey();
}
}
}
如何关闭新桌面上的所有进程？
我在控制台中只看到一个字符串：“TestDesktop”。
函数 GetThreadDesktop() 始终返回 0，除非进程名称为“TestDesktop”。
我用这个例子：http://www.codeproject.com/Articles/7666/Desktop-Switching
“我在 GetThreadDesktop 声明中添加了“SetLastError=true”。GetThreadDesktop 返回 IntPtr.Zero 后，我得到 Marshal.GetLastWin32Error。对于某些进程，包括 explorer.exe 和 122 (=ERROR_INSUFFICIENT_BUFFER)，我得到 5 (=ERROR_ACCESS_DENIED) ) 用于其他进程。”
【问题讨论】：