执行 pInvoke 并无法获得正确的 hDC
因此，我试图获取正确的设备上下文，以便我可以在 N 显示器配置 (2+) 中的各个显示器上设置伽玛斜坡。
我已经尝试
[DllImport("gdi32.dll")]
static extern IntPtr CreateDC(string lpszDriver, string lpszDevice, string lpszOutput, IntPtr lpInitData);
过使用这种方法，我为 lpszDriver 使用字符串“DISPLAY”，我使用另一个 pInvoke 方法枚举显示器，并获取显示设备名称，最终类似于“\Registry\Machine\System\CurrentControlSet\” Control\Class{4d36e96e-e325-11ce-bfc1-08002be10318}\0042" 并作为 lpszDevice 传入。 lpszOutput 为 null，lpInitData 为 IntPtr.Zero。返回的 hDC 可以工作，但似乎是全局的。
通过
[DllImport("user32.dll")]
public static extern IntPtr GetDC(IntPtr hWnd);
这种方法，我尝试使用实际的窗口窗体句柄。
我正在使用
[DllImport("gdi32.dll")]
private static extern int SetDeviceGammaRamp(IntPtr hDC, ref RAMP lpRamp);
它确实设置了伽玛斜坡，但它总是设置两个显示器。 有什么想法吗？
So I'm trying to get the right Device Context so I can set the gamma ramp on individual monitors in an N monitor configuration (2+).
I've tried
[DllImport("gdi32.dll")]
static extern IntPtr CreateDC(string lpszDriver, string lpszDevice, string lpszOutput, IntPtr lpInitData);
With this method I'm using the string "DISPLAY" for lpszDriver, I'm enumerating displays with another pInvoke method and getting the Display device name which ends up being something like "\Registry\Machine\System\CurrentControlSet\Control\Class{4d36e96e-e325-11ce-bfc1-08002be10318}\0042" and passing in as lpszDevice. lpszOutput is null and lpInitData is IntPtr.Zero. The hDC that comes back works, but seems to be global.
and
[DllImport("user32.dll")]
public static extern IntPtr GetDC(IntPtr hWnd);
With this method I've tried using the actual window form handle.
I'm using
[DllImport("gdi32.dll")]
private static extern int SetDeviceGammaRamp(IntPtr hDC, ref RAMP lpRamp);
It does set the gamma ramp, but it always sets both monitors.
Any ideas?
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使用设备名称“DISPLAY”将为您提供整个显示系统的 DC，因此设置伽马斜坡（对于您的示例）会影响系统中的所有显示器。
您可以通过调用
EnumDisplayMonitors检索每个显示器的HMONITOR，然后使用MONITORINFOEX 调用结构。GetMonitorInfo来获取单个显示器的设备名称每个HMONITOR的MONITORINFOEX包含一个szDevice成员，您可以将其传递给GetDC以获取专门用于监视（驱动卡）的 DC，并设置 gamma它的坡道。请注意，这实际上会为您提供显示器所连接的显卡的设备名称。如果内存正常，使用旧的硬件和/或软件，连接到同一张卡的两个显示器总是卡在相同的伽玛斜坡等。使用当前的硬件/软件，带有两个显示器的单张卡在系统看来就像两张卡（如果没记错的话，名称末尾带有“：0”或“：1”之类的内容），因此即使两个显示器连接到同一个物理卡，从设置伽玛斜坡的角度来看，它仍然被视为两个单独的显示器）。顺便说一句，我不确定到底需要多少新的硬件和/或软件才能将驱动多个显示器的单个物理卡视为多个虚拟卡。
Using the device name "DISPLAY" is getting you a DC for the whole display system, so setting the gamma ramp (for your example) affects all displays in the system.
You can get a device name for an individual monitor by calling
EnumDisplayMonitorsto retrieve anHMONITORfor each monitor, thenGetMonitorInfowith aMONITORINFOEXstructure for eachHMONITOR. TheMONITORINFOEXcontains anszDevicemember that you pass toGetDCto get a DC specifically for (the card driving) that monitor, and set the gamma ramp for it.Note that this actually gets you a device name for the graphics card to which the monitor is attached. If memory serves, with older hardware and/or software, two monitors attached to the same card were always stuck with the same gamma ramp and such. With current hardware/software, a single card with two monitors will look to the system like two cards (with something like a ":0" or ":1" on the end of the name, if memory serves), so even if the two monitors are attached to the same physical card, from a viewpoint of setting the gamma ramp, it's still treated as two separate ones). Offhand, I'm not sure of exactly how new of hardware and/or software is needed to treat a single physical card driving multiple monitors as multiple virtual cards.