protected override void OnStart(string[] args)
{
base.OnStart(args);
CaptureScreen();
}
protected override void OnStop()
{
base.OnStop();
}
private void CaptureScreen()
{
Bitmap printscreen = new Bitmap(Screen.PrimaryScreen.Bounds.Width, Screen.PrimaryScreen.Bounds.Height);
Graphics graphics = Graphics.FromImage(printscreen as Image);
graphics.CopyFromScreen(0, 0, 0, 0, printscreen.Size);
printscreen.Save(@"L:\" + Counter++ + ".jpg", ImageFormat.Jpeg);
}
答案 0 :(得分：7)
这是添加到Vista的会话0隔离功能的一部分。服务现在使用自己的工作站和桌面运行自己的会话。就像登录提示和屏幕保护程序运行的会话一样。您正在截取该会话桌面的截图，其中没有任何内容。无法再访问用户桌面。它是一种安全功能，可以防止破碎攻击。不可否认，我不明白为什么没有删除“与桌面交互”复选框。
您需要将程序更改为“Windows应用程序”，而不是服务。在Startup文件夹中放置一个快捷方式或使用Run注册表项。没关系，没有用户登录时没什么值得抓拍的。
答案 1 :(得分：1)
您需要将服务设置为用户Windows工作站。这不是我的代码，我不记得从哪里得到它。 添加这两个类 然后你可以创建一个桌面对象
桌面userDesk = new桌面（）;
然后，当您需要服务与用户会话进行交互时，您需要编写
userDesk.BeginInteraction（）;
最后返回您致电
的服务会话userDesk.EndInteraction（）;
internal class Desktop
{
private IntPtr m_hCurWinsta = IntPtr.Zero;
private IntPtr m_hCurDesktop = IntPtr.Zero;
private IntPtr m_hWinsta = IntPtr.Zero;
private IntPtr m_hDesk = IntPtr.Zero;
/// <summary>
/// associate the current thread to the default desktop
/// </summary>
/// <returns></returns>
internal bool BeginInteraction()
{
EndInteraction();
m_hCurWinsta = User32DLL.GetProcessWindowStation();
if (m_hCurWinsta == IntPtr.Zero)
return false;
m_hCurDesktop = User32DLL.GetDesktopWindow();
if (m_hCurDesktop == IntPtr.Zero)
return false;
m_hWinsta = User32DLL.OpenWindowStation("winsta0", false,
WindowStationAccessRight.WINSTA_ACCESSCLIPBOARD |
WindowStationAccessRight.WINSTA_ACCESSGLOBALATOMS |
WindowStationAccessRight.WINSTA_CREATEDESKTOP |
WindowStationAccessRight.WINSTA_ENUMDESKTOPS |
WindowStationAccessRight.WINSTA_ENUMERATE |
WindowStationAccessRight.WINSTA_EXITWINDOWS |
WindowStationAccessRight.WINSTA_READATTRIBUTES |
WindowStationAccessRight.WINSTA_READSCREEN |
WindowStationAccessRight.WINSTA_WRITEATTRIBUTES
);
if (m_hWinsta == IntPtr.Zero)
return false;
User32DLL.SetProcessWindowStation(m_hWinsta);
m_hDesk = User32DLL.OpenDesktop("default", OpenDesktopFlag.DF_NONE, false,
DesktopAccessRight.DESKTOP_CREATEMENU |
DesktopAccessRight.DESKTOP_CREATEWINDOW |
DesktopAccessRight.DESKTOP_ENUMERATE |
DesktopAccessRight.DESKTOP_HOOKCONTROL |
DesktopAccessRight.DESKTOP_JOURNALPLAYBACK |
DesktopAccessRight.DESKTOP_JOURNALRECORD |
DesktopAccessRight.DESKTOP_READOBJECTS |
DesktopAccessRight.DESKTOP_SWITCHDESKTOP |
DesktopAccessRight.DESKTOP_WRITEOBJECTS
);
if (m_hDesk == IntPtr.Zero)
return false;
User32DLL.SetThreadDesktop(m_hDesk);
return true;
}
/// <summary>
/// restore
/// </summary>
internal void EndInteraction()
{
if (m_hCurWinsta != IntPtr.Zero)
User32DLL.SetProcessWindowStation(m_hCurWinsta);
if (m_hCurDesktop != IntPtr.Zero)
User32DLL.SetThreadDesktop(m_hCurDesktop);
if (m_hWinsta != IntPtr.Zero)
User32DLL.CloseWindowStation(m_hWinsta);
if (m_hDesk != IntPtr.Zero)
User32DLL.CloseDesktop(m_hDesk);
}
}
public static class User32DLL
{
/// <summary>
/// The GetDesktopWindow function returns a handle to the desktop window.
/// The desktop window covers the entire screen.
/// The desktop window is the area on top of which other windows are painted.
/// </summary>
/// <returns>The return value is a handle to the desktop window. </returns>
[DllImport("User32.dll", CharSet = CharSet.Unicode, SetLastError = true)]
public static extern IntPtr GetDesktopWindow();
/// <summary>
/// Retrieves a handle to the current window station for the calling process.
/// </summary>
/// <returns>If the function succeeds,
/// the return value is a handle to the window station.
/// If the function fails, the return value is NULL.</returns>
[DllImport("User32.dll", CharSet = CharSet.Unicode, SetLastError = true)]
public static extern IntPtr GetProcessWindowStation();
/// <summary>
/// Retrieves a handle to the desktop assigned to the specified thread.
/// </summary>
/// <param name="dwThread">[in] Handle to the thread
/// for which to return the desktop handle.</param>
/// <returns>If the function succeeds, the return value is a handle to the
/// desktop associated with the specified thread.
/// If the function fails, the return value is NULL.</returns>
[DllImport("User32.dll", CharSet = CharSet.Unicode, SetLastError = true)]
public static extern IntPtr GetThreadDesktop(uint dwThread);
/// <summary>
/// Opens the specified window station.
/// </summary>
/// <param name="lpszWinSta">Pointer to a null-terminated
/// string specifying the name of the window station
/// to be opened. Window station names are case-insensitive.
/// This window station must belong to the current session.
/// </param>
/// <param name="fInherit">[in] If this value
/// is TRUE, processes created by this process
/// will inherit the handle. Otherwise,
/// the processes do not inherit this handle.
/// </param>
/// <param name="dwDesiredAccess">[in] Access to the window station</param>
/// <returns>If the function succeeds, the return value
/// is the handle to the specified window station.
/// If the function fails, the return value is NULL.</returns>
[DllImport("User32.dll", CharSet = CharSet.Unicode, SetLastError = true)]
public static extern IntPtr OpenWindowStation(string lpszWinSta
, bool fInherit
, WindowStationAccessRight dwDesiredAccess
);
/// <summary>
/// Assigns the specified window station to the calling process.
/// This enables the process to access objects in the window
/// station such as desktops, the clipboard, and global atoms.
/// All subsequent operations on the window station
/// use the access rights granted to hWinSta.
/// </summary>
/// <param name="hWinSta">[in] Handle to the window
/// station to be assigned to the calling process</param>
/// <returns>If the function succeeds, the return value is nonzero.
/// If the function fails, the return value is zero. </returns>
[DllImport("User32.dll", CharSet = CharSet.Unicode, SetLastError = true)]
public static extern IntPtr SetProcessWindowStation(IntPtr hWinSta);
/// <summary>
/// Closes an open window station handle.
/// </summary>
/// <param name="hWinSta">[in] Handle
/// to the window station to be closed.</param>
/// <returns>If the function succeeds, the return value is nonzero.
/// If the function fails, the return value is zero. </returns>
[DllImport("User32.dll", CharSet = CharSet.Unicode, SetLastError = true)]
public static extern IntPtr CloseWindowStation(IntPtr hWinSta);
/// <summary>
/// Opens the specified desktop object.
/// </summary>
/// <param name="lpszDesktop">[in] Pointer to null-terminated string
/// specifying the name of the desktop to be opened.
/// Desktop names are case-insensitive.
/// This desktop must belong to the current window station.</param>
/// <param name="dwFlags">[in] This parameter can
/// be zero or DF_ALLOWOTHERACCOUNTHOOK=0x0001</param>
/// <param name="fInherit">[in] If this value is TRUE, processes created by
/// this process will inherit the handle.
/// Otherwise, the processes do not inherit this handle. </param>
/// <param name="dwDesiredAccess">[in] Access
/// to the desktop. For a list of access rights</param>
/// <returns>If the function succeeds, the return value is a handle to the opened desktop.
/// When you are finished using the handle, call the CloseDesktop function to close it.
/// If the function fails, the return value is NULL.
/// </returns>
[DllImport("User32.dll", CharSet = CharSet.Unicode, SetLastError = true)]
public static extern IntPtr OpenDesktop(string lpszDesktop
, OpenDesktopFlag dwFlags
, bool fInherit
, DesktopAccessRight dwDesiredAccess
);
/// <summary>
/// Closes an open handle to a desktop object.
/// </summary>
/// <param name="hDesktop">[in] Handle to the desktop to be closed.</param>
/// <returns>If the function succeeds, the return value is nonzero.
/// If the function fails, the return value is zero. </returns>
[DllImport("User32.dll", CharSet = CharSet.Unicode, SetLastError = true)]
public static extern IntPtr CloseDesktop(IntPtr hDesktop);
/// <summary>
/// Assigns the specified desktop to the calling thread.
/// All subsequent operations on the desktop use the access rights granted to the desktop.
/// </summary>
/// <param name="hDesktop">[in] Handle to the desktop
/// to be assigned to the calling thread.</param>
/// <returns>If the function succeeds, the return value is nonzero.
/// If the function fails, the return value is zero. </returns>
[DllImport("User32.dll", CharSet = CharSet.Unicode, SetLastError = true)]
public static extern bool SetThreadDesktop(IntPtr hDesktop);
}
/// <summary>
/// REF MSDN:Window Station Security and Access Rights
/// ms-help://MS.MSDN.vAug06.en/dllproc/base/window_station_security_and_access_rights.htm
/// </summary>
[FlagsAttribute]
public enum WindowStationAccessRight : uint
{
/// <summary>All possible access rights for the window station.</summary>
WINSTA_ALL_ACCESS = 0x37F,
/// <summary>Required to use the clipboard.</summary>
WINSTA_ACCESSCLIPBOARD = 0x0004,
/// <summary>Required to manipulate global atoms.</summary>
WINSTA_ACCESSGLOBALATOMS = 0x0020,
/// <summary>Required to create new desktop
/// objects on the window station.</summary>
WINSTA_CREATEDESKTOP = 0x0008,
/// <summary>Required to enumerate existing desktop objects.</summary>
WINSTA_ENUMDESKTOPS = 0x0001,
/// <summary>Required for the window station to be enumerated.</summary>
WINSTA_ENUMERATE = 0x0100,
/// <summary>Required to successfully call the ExitWindows or ExitWindowsEx function.
/// Window stations can be shared by users and this access type can prevent other users
/// of a window station from logging off the window station owner.</summary>
WINSTA_EXITWINDOWS = 0x0040,
/// <summary>Required to read the attributes of a window station object.
/// This attribute includes color settings
/// and other global window station properties.</summary>
WINSTA_READATTRIBUTES = 0x0002,
/// <summary>Required to access screen contents.</summary>
WINSTA_READSCREEN = 0x0200,
/// <summary>Required to modify the attributes of
/// a window station object.
/// The attributes include color settings
/// and other global window station properties.</summary>
WINSTA_WRITEATTRIBUTES = 0x0010,
}
/// <summary>
/// OpenDesktop 2nd param
/// </summary>
public enum OpenDesktopFlag : uint
{
/// <summary>
/// Default value
/// </summary>
DF_NONE = 0x0000,
/// <summary>
/// Allows processes running in other accounts on the desktop
/// to set hooks in this process.
/// </summary>
DF_ALLOWOTHERACCOUNTHOOK = 0x0001,
}
/// <summary>
/// REF MSDN:Desktop Security and Access Rights
/// ms-help://MS.MSDN.vAug06.en/dllproc/base/desktop_security_and_access_rights.htm
/// </summary>
[FlagsAttribute]
public enum DesktopAccessRight : uint
{
/// <summary>Required to create a menu on the desktop. </summary>
DESKTOP_CREATEMENU = 0x0004,
/// <summary>Required to create a window on the desktop. </summary>
DESKTOP_CREATEWINDOW = 0x0002,
/// <summary>Required for the desktop to be enumerated. </summary>
DESKTOP_ENUMERATE = 0x0040,
/// <summary>Required to establish any of the window hooks. </summary>
DESKTOP_HOOKCONTROL = 0x0008,
/// <summary>Required to perform journal playback on a desktop. </summary>
DESKTOP_JOURNALPLAYBACK = 0x0020,
/// <summary>Required to perform journal recording on a desktop. </summary>
DESKTOP_JOURNALRECORD = 0x0010,
/// <summary>Required to read objects on the desktop. </summary>
DESKTOP_READOBJECTS = 0x0001,
/// <summary>Required to activate the desktop
/// using the SwitchDesktop function. </summary>
DESKTOP_SWITCHDESKTOP = 0x0100,
/// <summary>Required to write objects on the desktop. </summary>
DESKTOP_WRITEOBJECTS = 0x0080,
}
答案 2 :(得分：0)
该服务是“无头”，没有用户界面，没有100％肯定（CopyFromScreen的文档相当模糊）我希望在无头运行时失败。在多个用户同时登录的情况下，服务如何知道要复制哪个屏幕？
还可以查看this个问题
答案 3 :(得分：0)
对于XP / 2003，Interact with Desktop应该有所帮助。 对于Windows 7 / Windows 2008，Interact with Desktop的工作方式不同。
最适合您的解决方案是分析服务中的登录会话，对于新会话，在用户会话中启动“桌面”流程并与该流程进行通信以获取屏幕。