C++分离辅助显示器的应用程序
我正在尝试创建一个应用程序来将辅助显示器与 Windows 盒子分离（长话短说）。
这是我用作基础的 Microsoft 示例代码： http://support.microsoft.com/kb/308216/en-us
这是我的代码：
#include <iostream>
#include <windows.h>
void DetachDisplay()
{
BOOL FoundSecondaryDisp = FALSE;
DWORD DispNum = 0;
DISPLAY_DEVICE DisplayDevice;
LONG Result;
TCHAR szTemp[200];
int i = 0;
DEVMODE defaultMode;
// initialize DisplayDevice
ZeroMemory(&DisplayDevice, sizeof(DisplayDevice));
DisplayDevice.cb = sizeof(DisplayDevice);
// get all display devices
while (EnumDisplayDevices(NULL, DispNum, &DisplayDevice, 0))
{
ZeroMemory(&defaultMode, sizeof(DEVMODE));
defaultMode.dmSize = sizeof(DEVMODE);
if ( !EnumDisplaySettings((LPSTR)DisplayDevice.DeviceName, ENUM_REGISTRY_SETTINGS, &defaultMode) )
OutputDebugString("Store default failed\n");
if ((DisplayDevice.StateFlags & DISPLAY_DEVICE_ATTACHED_TO_DESKTOP) &&
!(DisplayDevice.StateFlags & DISPLAY_DEVICE_PRIMARY_DEVICE))
{
DEVMODE DevMode;
ZeroMemory(&DevMode, sizeof(DevMode));
DevMode.dmSize = sizeof(DevMode);
DevMode.dmFields = DM_PELSWIDTH | DM_PELSHEIGHT | DM_BITSPERPEL | DM_POSITION
| DM_DISPLAYFREQUENCY | DM_DISPLAYFLAGS ;
Result = ChangeDisplaySettingsEx((LPSTR)DisplayDevice.DeviceName, &DevMode, NULL, CDS_UPDATEREGISTRY, NULL);
//Result = ChangeDisplaySettingsEx((LPSTR)DisplayDevice.DeviceName, &DevMode, NULL, CDS_UPDATEREGISTRY, NULL);
ChangeDisplaySettingsEx (NULL, NULL, NULL, 0, NULL);
//The code below shows how to re-attach the secondary displays to the desktop
//ChangeDisplaySettingsEx((LPSTR)DisplayDevice.DeviceName, &defaultMode, NULL, CDS_UPDATEREGISTRY, NULL);
//ChangeDisplaySettingsEx((LPSTR)DisplayDevice.DeviceName, &defaultMode, NULL, CDS_UPDATEREGISTRY, NULL);
}
// Reinit DisplayDevice just to be extra clean
ZeroMemory(&DisplayDevice, sizeof(DisplayDevice));
DisplayDevice.cb = sizeof(DisplayDevice);
DispNum++;
} // end while for all display devices
}
int main()
{
DetachDisplay();
return 0;
}
然而，当我编译并运行它时，我得到的只是屏幕闪烁，就好像它正在改变分辨率一样，但它实际上并没有做任何有意义的事情（我确实注意到鼠标移动了......但除此之外什么也没有）。
也许其他人已经创建了一个实用程序来执行此确切的功能，如果可以从命令行调用它，它也会同样有效。
想法？
I am trying to create an application to detach a secondary monitor from Windows boxes (long story).
Here is Microsoft's sample code that I used as a basis:
http://support.microsoft.com/kb/308216/en-us
Here is my code:
#include <iostream>
#include <windows.h>
void DetachDisplay()
{
BOOL FoundSecondaryDisp = FALSE;
DWORD DispNum = 0;
DISPLAY_DEVICE DisplayDevice;
LONG Result;
TCHAR szTemp[200];
int i = 0;
DEVMODE defaultMode;
// initialize DisplayDevice
ZeroMemory(&DisplayDevice, sizeof(DisplayDevice));
DisplayDevice.cb = sizeof(DisplayDevice);
// get all display devices
while (EnumDisplayDevices(NULL, DispNum, &DisplayDevice, 0))
{
ZeroMemory(&defaultMode, sizeof(DEVMODE));
defaultMode.dmSize = sizeof(DEVMODE);
if ( !EnumDisplaySettings((LPSTR)DisplayDevice.DeviceName, ENUM_REGISTRY_SETTINGS, &defaultMode) )
OutputDebugString("Store default failed\n");
if ((DisplayDevice.StateFlags & DISPLAY_DEVICE_ATTACHED_TO_DESKTOP) &&
!(DisplayDevice.StateFlags & DISPLAY_DEVICE_PRIMARY_DEVICE))
{
DEVMODE DevMode;
ZeroMemory(&DevMode, sizeof(DevMode));
DevMode.dmSize = sizeof(DevMode);
DevMode.dmFields = DM_PELSWIDTH | DM_PELSHEIGHT | DM_BITSPERPEL | DM_POSITION
| DM_DISPLAYFREQUENCY | DM_DISPLAYFLAGS ;
Result = ChangeDisplaySettingsEx((LPSTR)DisplayDevice.DeviceName, &DevMode, NULL, CDS_UPDATEREGISTRY, NULL);
//Result = ChangeDisplaySettingsEx((LPSTR)DisplayDevice.DeviceName, &DevMode, NULL, CDS_UPDATEREGISTRY, NULL);
ChangeDisplaySettingsEx (NULL, NULL, NULL, 0, NULL);
//The code below shows how to re-attach the secondary displays to the desktop
//ChangeDisplaySettingsEx((LPSTR)DisplayDevice.DeviceName, &defaultMode, NULL, CDS_UPDATEREGISTRY, NULL);
//ChangeDisplaySettingsEx((LPSTR)DisplayDevice.DeviceName, &defaultMode, NULL, CDS_UPDATEREGISTRY, NULL);
}
// Reinit DisplayDevice just to be extra clean
ZeroMemory(&DisplayDevice, sizeof(DisplayDevice));
DisplayDevice.cb = sizeof(DisplayDevice);
DispNum++;
} // end while for all display devices
}
int main()
{
DetachDisplay();
return 0;
}
However, when I compile and run it all I get is the screen to flicker as if it is changing resolutions but it doesn't actually do anything meaningful (I do notice the mouse moved...but other than that nothing).
Perhaps someone else has already created a utility to do this exact functionality, which would work just as good if it can be invoked from the command line.
Thoughts?
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评论（4）
您可以使用 SetDisplayConfig 在 Windows 7 中执行此操作。下面的示例禁用所有辅助屏幕。
有关所使用函数的更多信息：http ://msdn.microsoft.com/en-us/library/ff539596%28v=VS.85%29.aspx
You can use SetDisplayConfig to do this in windows 7. The example below disables all secondary screens.
For a bit more info on the functions used: http://msdn.microsoft.com/en-us/library/ff539596%28v=VS.85%29.aspx
我知道这是一个很老的线程，但我在研究自己的问题时遇到了它：寻找一种在控制台会话（因此 WinSta0）在 Windows 7 上锁定时在分离的辅助显示设备上显示非交互式桌面的方法 分离
回答原始问题：
显示设备时：
如果要分离显示器，则如果您指定
CDS_RESET和 <，则无需第二次调用ChangeDisplaySettings(Ex)code>CDS_UPDATEREGISTRY 在原始调用中。但是，如果您要连接显示器，则似乎需要第二次调用 ChangeDisplaySettings（或者至少我还没有找到解决方法）。我在下面提供了有效的 C# 代码。这是一个与之配合使用的 PowerShell 脚本
I know this is a way old thread but I came upon it while researching my own problem: Looking for a method for displaying a non-interactive desktop on a detached secondary display device while the console session (and therefore WinSta0) is locked on Windows 7.
Answer to original question:
When detaching a display device:
If you are detaching a display, the second call to
ChangeDisplaySettings(Ex)is unnecessary if you specifyCDS_RESETalong withCDS_UPDATEREGISTRYin the original call. However, if you are attaching a display, the second call toChangeDisplaySettingsdoes appear to be required (or, at least, I haven't figured out a way around it).I provide working C# code below. Here is a PowerShell script to use with it
上面的代码片段实际上分离了辅助显示设备，而不是监视器。同一显示设备可以包含多个监视器。我还没有成功解决这个问题
The code snippet above actually detaches secondary display device, not monitor. The same display device may contain multiple monitors. I haven't succeeded with this problem yet