与Windows7 Display API通信
我还没有找到一个体面的（任何真正的）pinvoke包装新win7 CCD api。 api可以从这里找到： http ： //msdn.microsoft.com/en-us/library/windows/hardware/hh406259（v = vs.85）.aspx
我花了几个小时来转换结构/方法调用，以便我可以在C＃中使用它。
这是第一个“草案”：
using System; using System.Runtime.InteropServices; namespace CONVERTING_CCD { /// /// This class takes care of wrapping "Connecting and Configuring Displays(CCD) Win32 API" /// Author Erti-Chris Eelmaa || easter199 at hotmail dot com /// public class CCDWrapper { [StructLayout(LayoutKind.Sequential)] public struct LUID { public uint LowPart; public uint HighPart; } [Flags] public enum DisplayConfigVideoOutputTechnology : uint { Other = 4294967295, // -1 Hd15 = 0, Svideo = 1, CompositeVideo = 2, ComponentVideo = 3, Dvi = 4, Hdmi = 5, Lvds = 6, DJpn = 8, Sdi = 9, DisplayportExternal = 10, DisplayportEmbedded = 11, UdiExternal = 12, UdiEmbedded = 13, Sdtvdongle = 14, Internal = 0x80000000, ForceUint32 = 0xFFFFFFFF } #region SdcFlags enum [Flags] public enum SdcFlags : uint { Zero = 0, TopologyInternal = 0x00000001, TopologyClone = 0x00000002, TopologyExtend = 0x00000004, TopologyExternal = 0x00000008, TopologySupplied = 0x00000010, UseSuppliedDisplayConfig = 0x00000020, Validate = 0x00000040, Apply = 0x00000080, NoOptimization = 0x00000100, SaveToDatabase = 0x00000200, AllowChanges = 0x00000400, PathPersistIfRequired = 0x00000800, ForceModeEnumeration = 0x00001000, AllowPathOrderChanges = 0x00002000, UseDatabaseCurrent = TopologyInternal | TopologyClone | TopologyExtend | TopologyExternal } [Flags] public enum DisplayConfigFlags : uint { Zero = 0x0, PathActive = 0x00000001 } [Flags] public enum DisplayConfigSourceStatus { Zero = 0x0, InUse = 0x00000001 } [Flags] public enum DisplayConfigTargetStatus : uint { Zero = 0x0, InUse = 0x00000001, FORCIBLE = 0x00000002, ForcedAvailabilityBoot = 0x00000004, ForcedAvailabilityPath = 0x00000008, ForcedAvailabilitySystem = 0x00000010, } [Flags] public enum DisplayConfigRotation : uint { Zero = 0x0, Identity = 1, Rotate90 = 2, Rotate180 = 3, Rotate270 = 4, ForceUint32 = 0xFFFFFFFF } [Flags] public enum DisplayConfigPixelFormat : uint { Zero = 0x0, Pixelformat8Bpp = 1, Pixelformat16Bpp = 2, Pixelformat24Bpp = 3, Pixelformat32Bpp = 4, PixelformatNongdi = 5, PixelformatForceUint32 = 0xffffffff } [Flags] public enum DisplayConfigScaling : uint { Zero = 0x0, Identity = 1, Centered = 2, Stretched = 3, Aspectratiocenteredmax = 4, Custom = 5, Preferred = 128, ForceUint32 = 0xFFFFFFFF } [StructLayout(LayoutKind.Sequential)] public struct DisplayConfigRational { public uint numerator; public uint denominator; } [Flags] public enum DisplayConfigScanLineOrdering : uint { Unspecified = 0, Progressive = 1, Interlaced = 2, InterlacedUpperfieldfirst = Interlaced, InterlacedLowerfieldfirst = 3, ForceUint32 = 0xFFFFFFFF } [StructLayout(LayoutKind.Sequential)] public struct DisplayConfigPathInfo { public DisplayConfigPathSourceInfo sourceInfo; public DisplayConfigPathTargetInfo targetInfo; public uint flags; } [Flags] public enum DisplayConfigModeInfoType : uint { Zero = 0, Source = 1, Target = 2, ForceUint32 = 0xFFFFFFFF } [StructLayout(LayoutKind.Explicit)] public struct DisplayConfigModeInfo { [FieldOffset((0))] public DisplayConfigModeInfoType infoType; [FieldOffset(4)] public uint id; [FieldOffset(8)] public LUID adapterId; [FieldOffset(16)] public DisplayConfigTargetMode targetMode; [FieldOffset(16)] public DisplayConfigSourceMode sourceMode; } [StructLayout(LayoutKind.Sequential)] public struct DisplayConfig2DRegion { public uint cx; public uint cy; } [Flags] public enum D3DmdtVideoSignalStandard : uint { Uninitialized = 0, VesaDmt = 1, VesaGtf = 2, VesaCvt = 3, Ibm = 4, Apple = 5, NtscM = 6, NtscJ = 7, Ntsc443 = 8, PalB = 9, PalB1 = 10, PalG = 11, PalH = 12, PalI = 13, PalD = 14, PalN = 15, PalNc = 16, SecamB = 17, SecamD = 18, SecamG = 19, SecamH = 20, SecamK = 21, SecamK1 = 22, SecamL = 23, SecamL1 = 24, Eia861 = 25, Eia861A = 26, Eia861B = 27, PalK = 28, PalK1 = 29, PalL = 30, PalM = 31, Other = 255 } [StructLayout(LayoutKind.Sequential)] public struct DisplayConfigVideoSignalInfo { public long pixelRate; public DisplayConfigRational hSyncFreq; public DisplayConfigRational vSyncFreq; public DisplayConfig2DRegion activeSize; public DisplayConfig2DRegion totalSize; public D3DmdtVideoSignalStandard videoStandard; public DisplayConfigScanLineOrdering ScanLineOrdering; } [StructLayout(LayoutKind.Sequential)] public struct DisplayConfigTargetMode { public DisplayConfigVideoSignalInfo targetVideoSignalInfo; } [StructLayout(LayoutKind.Sequential)] public struct PointL { public int x; public int y; } [StructLayout(LayoutKind.Sequential)] public struct DisplayConfigSourceMode { public uint width; public uint height; public DisplayConfigPixelFormat pixelFormat; public PointL position; } [StructLayout(LayoutKind.Sequential)] public struct DisplayConfigPathSourceInfo { public LUID adapterId; public uint id; public uint modeInfoIdx; public DisplayConfigSourceStatus statusFlags; } [StructLayout(LayoutKind.Sequential)] public struct DisplayConfigPathTargetInfo { public LUID adapterId; public uint id; public uint modeInfoIdx; public DisplayConfigVideoOutputTechnology outputTechnology; public DisplayConfigRotation rotation; public DisplayConfigScaling scaling; public DisplayConfigRational refreshRate; public DisplayConfigScanLineOrdering scanLineOrdering; public bool targetAvailable; public DisplayConfigTargetStatus statusFlags; } [Flags] public enum QueryDisplayFlags : uint { Zero = 0x0, AllPaths = 0x00000001, OnlyActivePaths = 0x00000002, DatabaseCurrent = 0x00000004 } [Flags] public enum DisplayConfigTopologyId : uint { Zero = 0x0, Internal = 0x00000001, Clone = 0x00000002, Extend = 0x00000004, External = 0x00000008, ForceUint32 = 0xFFFFFFFF } #endregion [DllImport("User32.dll")] public static extern int SetDisplayConfig(uint numPathArrayElements, out DisplayConfigPathInfo pathArray, uint numModeInfoArrayElements, out DisplayConfigModeInfo modeInfoArray, SdcFlags flags); [DllImport("User32.dll")] public static extern int QueryDisplayConfig(QueryDisplayFlags flags, ref int numPathArrayElements, ref DisplayConfigPathInfo[] pathInfoArray, ref int modeInfoArrayElements, ref DisplayConfigModeInfo[] modeInfoArray, IntPtr z); [DllImport("User32.dll")] public static extern int GetDisplayConfigBufferSizes(QueryDisplayFlags flags, out int numPathArrayElements, out int numModeInfoArrayElements); } } 我差不多完成了，当它完成后，我会把它发送到pinvoke.net。 现在有一个问题，即当我调用QueryDisplayConfig（）时，将抛出null-referenceexception，这根本不告诉我任何事情。 我花了几个小时重新检查一切，从前到后，从前到后。
这是实际的代码用法：
static void Main(string[] args) { int numPathArrayElements; int numModeInfoArrayElements; // query active paths from the current computer. if (CCDWrapper.GetDisplayConfigBufferSizes(CCDWrapper.QueryDisplayFlags.OnlyActivePaths, out numPathArrayElements, out numModeInfoArrayElements) == 0) { // 0 is success. var pathInfoArray = new CCDWrapper.DisplayConfigPathInfo[numPathArrayElements]; var modeInfoArray = new CCDWrapper.DisplayConfigModeInfo[numModeInfoArrayElements]; CCDWrapper.DisplayConfigTopologyId currentTopologyId; // don't use it right now. var first = Marshal.SizeOf(new CCDWrapper.DisplayConfigPathInfo()); var second = Marshal.SizeOf(new CCDWrapper.DisplayConfigModeInfo()); var status = CCDWrapper.QueryDisplayConfig(CCDWrapper.QueryDisplayFlags.OnlyActivePaths, ref numPathArrayElements, ref pathInfoArray, ref numModeInfoArrayElements, ref modeInfoArray, IntPtr.Zero); } }
请注意，结构大小应该是正确的：
var first = Marshal.SizeOf(new CCDWrapper.DisplayConfigPathInfo()); var second = Marshal.SizeOf(new CCDWrapper.DisplayConfigModeInfo());
first => 72，second => 64，
当我从C ++中检查它时：
int first = sizeof(DISPLAYCONFIG_PATH_INFO); int second = sizeof(DISPLAYCONFIG_MODE_INFO);
它给了我相同的结果。
您在SetDisplayConfig和QueryDisplayConfig声明中处理数组是错误的。 尝试这些更改：
[DllImport("User32.dll")] public static extern int SetDisplayConfig( uint numPathArrayElements, [In] DisplayConfigPathInfo[] pathArray, uint numModeInfoArrayElements, [In] DisplayConfigModeInfo[] modeInfoArray, SdcFlags flags ); [DllImport("User32.dll")] public static extern int QueryDisplayConfig( QueryDisplayFlags flags, ref int numPathArrayElements, [Out] DisplayConfigPathInfo[] pathInfoArray, ref int modeInfoArrayElements, [Out] DisplayConfigModeInfo[] modeInfoArray, IntPtr z );