C# 确定当前演示文稿显示模式

由此，我有以下代码将我的演示模式切换为“扩展”：

但我只想在演示文稿显示模式尚未设置为“扩展”时运行该代码段。是否仍然可以通过编程方式确定机器的当前演示显示模式

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注意：该解决方案只需在Windows 8计算机上运行。

我不知道您是否仍对解决方案感兴趣。 您必须使用CCD（连接和配置显示器），并且只能通过使用dllimport调用windows函数来实现。 这是到CCD的链接

为此，您必须拨打2个电话。首先，您必须获得缓冲区大小，然后是显示配置

[DllImport("User32.dll")]
    public static extern StatusCode GetDisplayConfigBufferSizes(
        QueryDisplayConfigFlags flags, 
        out int numPathArrayElements,
        out int numModeInfoArrayElements);

[Flags]
public enum QueryDisplayConfigFlags : uint
{
    QDC_ZERO = 0x0,
    QDC_ALL_PATHS = 0x00000001,
    QDC_ONLY_ACTIVE_PATHS = 0x00000002,
    QDC_DATABASE_CURRENT = 0x00000004
}

public enum StatusCode : uint
{
    Success = 0,
    InvalidParameter = 87,
    NotSupported = 50,
    AccessDenied = 5,
    GenFailure = 31,
    BadConfiguration = 1610,
    InSufficientBuffer = 122,
}

int numPathArrayElements;
int numModeInfoArrayElements;

var status = CCDWrapper.GetDisplayConfigBufferSizes(
             pathType,
             out numPathArrayElements,
             out numModeInfoArrayElements);

[DllImport("User32.dll")]
    public static extern StatusCode QueryDisplayConfig(
        QueryDisplayConfigFlags flags,
        ref int numPathArrayElements,
        [Out] DISPLAYCONFIG_PATH_INFO[] pathInfoArray,
        ref int modeInfoArrayElements,
        [Out] DisplayConfigModeInfo[] modeInfoArray,
        out DISPLAYCONFIG_TOPOLOGY_ID_Flags topologyId
    );

[Flags]
public enum DISPLAYCONFIG_TOPOLOGY_ID_Flags: uint
{
    DISPLAYCONFIG_TOPOLOGY_ZERO = 0x0,
    DISPLAYCONFIG_TOPOLOGY_INTERNAL = 0x00000001,
    DISPLAYCONFIG_TOPOLOGY_CLONE = 0x00000002,
    DISPLAYCONFIG_TOPOLOGY_EXTEND = 0x00000004,
    DISPLAYCONFIG_TOPOLOGY_EXTERNAL = 0x00000008,
    DISPLAYCONFIG_TOPOLOGY_FORCE_UINT32 = 0xFFFFFFFF
}

调用中还需要DISPLAYCONFIG\u PATH\u INFO和DisplayConfigModeInfo。它们不能为空。但这两种结构包括其他几种类型，它们太多了，无法粘贴在这里

如果您遵循以下链接，您将在github上找到一个示例项目。

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从那里您可以复制缺少的结构。

感谢您的努力。我们没有执行检查就发货了。extend feature用例是一个非常小的用例，所以我想它将在优先级列表中非常低，但是如果我设法找到一些时间返回并在以后的版本中尝试一下，我将更新以接受这个答案。

[DllImport("User32.dll")]
    public static extern StatusCode GetDisplayConfigBufferSizes(
        QueryDisplayConfigFlags flags, 
        out int numPathArrayElements,
        out int numModeInfoArrayElements);

[Flags]
public enum QueryDisplayConfigFlags : uint
{
    QDC_ZERO = 0x0,
    QDC_ALL_PATHS = 0x00000001,
    QDC_ONLY_ACTIVE_PATHS = 0x00000002,
    QDC_DATABASE_CURRENT = 0x00000004
}

public enum StatusCode : uint
{
    Success = 0,
    InvalidParameter = 87,
    NotSupported = 50,
    AccessDenied = 5,
    GenFailure = 31,
    BadConfiguration = 1610,
    InSufficientBuffer = 122,
}

int numPathArrayElements;
int numModeInfoArrayElements;

var status = CCDWrapper.GetDisplayConfigBufferSizes(
             pathType,
             out numPathArrayElements,
             out numModeInfoArrayElements);

[DllImport("User32.dll")]
    public static extern StatusCode QueryDisplayConfig(
        QueryDisplayConfigFlags flags,
        ref int numPathArrayElements,
        [Out] DISPLAYCONFIG_PATH_INFO[] pathInfoArray,
        ref int modeInfoArrayElements,
        [Out] DisplayConfigModeInfo[] modeInfoArray,
        out DISPLAYCONFIG_TOPOLOGY_ID_Flags topologyId
    );

[Flags]
public enum DISPLAYCONFIG_TOPOLOGY_ID_Flags: uint
{
    DISPLAYCONFIG_TOPOLOGY_ZERO = 0x0,
    DISPLAYCONFIG_TOPOLOGY_INTERNAL = 0x00000001,
    DISPLAYCONFIG_TOPOLOGY_CLONE = 0x00000002,
    DISPLAYCONFIG_TOPOLOGY_EXTEND = 0x00000004,
    DISPLAYCONFIG_TOPOLOGY_EXTERNAL = 0x00000008,
    DISPLAYCONFIG_TOPOLOGY_FORCE_UINT32 = 0xFFFFFFFF
}