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c# - 即使主要被锁定,如何在扩展监视器中连续显示 Windows 窗体

转载 作者:可可西里 更新时间:2023-11-01 10:05:48 24 4
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在我们的项目中,我们需要在连接到 CPU 的扩展显示器中显示仪表板(Windows 窗体)。

目前我们能够在扩展显示中显示仪表板,但是一旦系统(主)被锁定,扩展显示就不会显示任何内容。

我们不允许对工作站锁定进行任何更改。

即使主要被锁定,我们也必须在扩展显示器上显示仪表板。一旦将仪表板发送到扩展显示器,是否有任何方法可以消除对主显示器的依赖?

我们正在使用 VS2013 和 C#。

谢谢,斯里克

最佳答案

“我们不允许对工作站锁定进行任何更改。”

很确定这是一个 Windows 问题,如果不“更改工作站锁定”,就没有办法绕过它。为了进一步说明这一点,Windows 会在您锁定计算机时锁定所有显示 - 原因很明显。锁定计算机并仍然显示桌面/文件是没有意义的。除非您实际上没有“锁定”计算机,否则辅助显示器将被 Windows 锁定(假设这是您正在使用的操作系统)。

为了扩展这一点,实际上可以不锁定计算机,而是创建一个全局键/鼠标钩子(Hook)(不要忘记您还需要额外的长度来锁定 CTRL+ ALT+DELETE 如果你想正确执行)忽略所有按键/鼠标移动。

我身上没有用 C# 编写的代码,但这是我编写的 AutoIt 代码,它可以锁定我的键盘和鼠标,并在我的屏幕上显示飞翔的喵星人。如果有人按下某个键,它会通过 Windows API 锁定计算机(真正的方式)。

;///////////////////////////////
;// Lock Code Created by DT //
;///////////////////////////////
#include <WinApi.au3>
#include <GUIConstantsEx.au3>
#include <WindowsConstants.au3>

Sleep(5000);

;///////////////////////////////////////////////////////////////
;// Hook User32.dll to block Mouse/Keyboard Input and Monitor //
;///////////////////////////////////////////////////////////////
Global $stub_KeyProc = DllCallbackRegister("_KeyProc", "int", "int;ptr;ptr")
Global $stub_MouseProc = DllCallBackRegister("_MouseProc", "int", "int;ptr;ptr")
Global $keyboardHook = _WinAPI_SetWindowsHookEx($WH_KEYBOARD_LL, DllCallbackGetPtr($stub_KeyProc), _WinAPI_GetModuleHandle(0), 0)
Global $mouseHook = _WinAPI_SetWindowsHookEx($WH_MOUSE_LL, DllCallbackGetPtr($stub_MouseProc), _WinAPI_GetModuleHandle(0), 0)

;//////////////////////
;// Global Variables //
;//////////////////////
Global $lock = False ;If a key is pressed, set this to True and handle it in our while loop (gets messy otherwise)
Global $desktopSize = WinGetPos("Program Manager") ;Get the desktop size from Program Manager
Global $maxX = $desktopSize[2]; - 600 ;Set a Max X Position by using the width of our image and width of desktop
Global $maxY = $desktopSize[3]; - 255 ;Set a Max Y position by using the height of our image and the height of desktop
Global $splashX = Int(Random(1, $maxX-1)) ;Display our splash randomly in the acceptable space
Global $splashY = Int(Random(1, $maxY-1)) ;Display our splash randomly in the acceptable space
Global $splashXVel = Int(Random(10,20)) ;Setup a random velocity for our image
Global $splashYVel = 0;Int(Random(-5,5)) ;Setup a random velocity for our image (No need for Y Velocity anymore)

;////////////////////////////
;// Create and Display GUI //
;////////////////////////////
$Form1 = GuiCreate("Locked",400,280,$splashX, $splashY, $WS_POPUP, $WS_EX_LAYERED) ;Create a GUI Window (Layered For Transparency)
$gifTest = ObjCreate("Shell.Explorer.2") ;Create a Shell.Explorer Object to display a GIF
$gifTest_ctrol = GuiCtrlCreateObj($gifTest,-5,-5,410,290) ;Push it slightly out of our GUI bounds to hide the border
; ;Create a variable to hold some simple HTML code that displays a GIF
$URL = "about:<html><body bgcolor='#dedede' scroll='no'><img src='C:\Users\DT\Pictures\nyan-cat.gif'></img></body></html>"
$gifTest.Navigate($URL) ;Point our shell explorer to our HTML code
_WinAPI_SetLayeredWindowAttributes($Form1, 0xdedede, 255) ;Set our transparency color to our html background to make everything transparent
GUISetState(@SW_SHOW) ;And finally, display our GUI

;///////////////////////////////////////////////////////
;// Function that is called whenever a key is pressed //
;///////////////////////////////////////////////////////
Func _KeyProc($nCode, $wParam, $lParam) ;Grab parameters from our DLL Hook
If $nCode < 0 Then Return _WinAPI_CallNextHookEx($keyboardHook, $nCode, $wParam, $lParam) ;If it's not actually a key being pressed call the next hook
$lock = True ;Otherwise, it's time to lock the computer
Return 1 ;Don't call the next hook (supress key press)
EndFunc

;///////////////////////////////////////////////////////
;// Function that is called whenever the mouse moves //
;///////////////////////////////////////////////////////
Func _MouseProc($nCode, $wParam, $lParam) ;Grab parameters from our DLL Hook
randomizeVelocity() ;randomize our splash velocity
randomizePosition() ;and randomize its position
Return 1 ;then supress the mouse movement
EndFunc

;///////////////////////////////////////////////////////////////////////
;// Simple randomize functions to reuse code and for ease of reading //
;///////////////////////////////////////////////////////////////////////
Func randomizeVelocity()
$splashXVel = Int(Random(10,20))
;$splashYVel = Int(Random(-3,3))
EndFunc
Func randomizePosition()
$splashX = Int(Random(1, $maxX-1))
$splashY = Int(Random(1, $maxY-1))
EndFunc

;/////////////////////////////////////////////////
;// Our program loop (main function basically) //
;/////////////////////////////////////////////////
hideTaskbar();
While 1 ;loop indefinitely (until we exit :))
$splashX = $splashX + $splashXVel ;Modify splash x position by velocity
$splashY = $splashY + $splashYVel ;Modify splash y position by velocity
WinMove($Form1,"" , $splashX, $splashY) ;and move the window

;If $splashX >= $maxX Or $splashX <= 0 Then $splashXVel *= -1 ;if our splash image hits an edge
;If $splashY >= $maxY Or $splashY <= 0 Then $splashYVel *= -1 ;reverse its velocity (can be buggy! ;))
If $splashX >= $maxX Then
$splashY = Int(Random(1,$maxY-400))
$splashX = -400;
EndIf

If $lock Then ;If we have a message to lock the computer
DllCallbackFree($stub_KeyProc) ;release our hooks
DllCallbackFree($stub_MouseProc)
_WinAPI_UnhookWindowsHookEx($keyboardHook)
_WinAPI_UnhookWindowsHookEx($mouseHook)
showTaskbar();
Run("rundll32.exe user32.dll,LockWorkStation") ;and lock the computer
Exit ;then exit the program :)
EndIf
Sleep(40)
WEnd
;/////////////////////////////////////////////////

Func hideTaskbar()
WinSetTrans("[Class:Shell_TrayWnd]", "", 0)
ControlHide('','', WinGetHandle("[CLASS:Button]"))
EndFunc
Func showTaskbar()
WinSetTrans("[Class:Shell_TrayWnd]", "", 255)
ControlShow('','', WinGetHandle("[CLASS:Button]"))
EndFunc

enter image description here

编辑:

关于 CTRL+ALT+DEL 组合键(或其他 Windows 组合键),请查看此链接以获取有关如何操作的信息禁用那些:

http://tamas.io/c-disable-ctrl-alt-del-alt-tab-alt-f4-start-menu-and-so-on/

关于c# - 即使主要被锁定,如何在扩展监视器中连续显示 Windows 窗体,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/26413343/

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