什么是Windows剪贴板CF_格式，例如-16230，-15835，-15834等？

Question

什么是Windows剪贴板CF_格式，例如-16230，-15835，-15834等？

我可以找到的所有格式都是MS文档中的格式。当尝试实现文件拖放（从我的应用程序到Windows的文件浏览器）时，我收到许多GetData要求提供cfFormat值的请求，例如-16230，-15835，-15834，但我不知道它们是什么。

[当我尝试使用该DoDragDrop功能将文件名从应用程序拖到文件资源管理器时，显示完整日志。]

Mouse Down
EnumFormatEtc
EnumFormatEtc::Next(1)
EnumFormatEtc::Next(1)
EnumFormatEtc::Reset
EnumFormatEtc::Next(1)
EnumFormatEtc::Next(1)
QueryGetData(cf = 15, ty = TYMED_HGLOBAL, asp = DVASPECT_CONTENT)
GetData(cf = -16230, ty = TYMED_HGLOBAL, asp = DVASPECT_CONTENT)
Returning null.
GetData(cf = -15835, ty = TYMED_HGLOBAL, asp = DVASPECT_CONTENT)
Returning null.
GetData(cf = -15834, ty = TYMED_HGLOBAL, asp = DVASPECT_CONTENT)
Returning null.
GetData(cf = -15833, ty = TYMED_HGLOBAL, asp = DVASPECT_CONTENT)
Returning null.
GetData(cf = -15832, ty = TYMED_HGLOBAL, asp = DVASPECT_CONTENT)
Returning null.
GetData(cf = -16206, ty = TYMED_HGLOBAL, asp = DVASPECT_CONTENT)
Returning null.
GetData(cf = -15832, ty = TYMED_HGLOBAL, asp = DVASPECT_CONTENT)
Returning null.
GetData(cf = -16207, ty = TYMED_HGLOBAL, asp = DVASPECT_CONTENT)
Returning null.
GetData(cf = -16215, ty = TYMED_ISTREAM, asp = DVASPECT_CONTENT)
Returning null.
GetData(cf = -15797, ty = TYMED_HGLOBAL, asp = DVASPECT_CONTENT)
Returning null.
QueryGetData(cf = -16230, ty = TYMED_HGLOBAL, asp = DVASPECT_CONTENT)
SetData(cf = -16206, ty = TYMED_HGLOBAL, asp = DVASPECT_CONTENT)
GetData(cf = -16206, ty = TYMED_HGLOBAL, asp = DVASPECT_CONTENT)
Returning null.
GetData(cf = -15832, ty = TYMED_HGLOBAL, asp = DVASPECT_CONTENT)
Returning null.
GetData(cf = -16207, ty = TYMED_HGLOBAL, asp = DVASPECT_CONTENT)
Returning null.
GetData(cf = -15797, ty = TYMED_HGLOBAL, asp = DVASPECT_CONTENT)
Returning null.
SetData(cf = -16206, ty = TYMED_HGLOBAL, asp = DVASPECT_CONTENT)
GetData(cf = -16206, ty = TYMED_HGLOBAL, asp = DVASPECT_CONTENT)
Returning null.
GetData(cf = -15832, ty = TYMED_HGLOBAL, asp = DVASPECT_CONTENT)
Returning null.
GetData(cf = -16207, ty = TYMED_HGLOBAL, asp = DVASPECT_CONTENT)
Returning null.
GetData(cf = -15797, ty = TYMED_HGLOBAL, asp = DVASPECT_CONTENT)
Returning null.
SetData(cf = -16206, ty = TYMED_HGLOBAL, asp = DVASPECT_CONTENT)
GetData(cf = -16206, ty = TYMED_HGLOBAL, asp = DVASPECT_CONTENT)
Returning null.
GetData(cf = -15832, ty = TYMED_HGLOBAL, asp = DVASPECT_CONTENT)
Returning null.
GetData(cf = -16207, ty = TYMED_HGLOBAL, asp = DVASPECT_CONTENT)
Returning null.
GetData(cf = -15797, ty = TYMED_HGLOBAL, asp = DVASPECT_CONTENT)
Returning null.
SetData(cf = -16206, ty = TYMED_HGLOBAL, asp = DVASPECT_CONTENT)
GetData(cf = -16206, ty = TYMED_HGLOBAL, asp = DVASPECT_CONTENT)
Returning null.
GetData(cf = -15832, ty = TYMED_HGLOBAL, asp = DVASPECT_CONTENT)
Returning null.
GetData(cf = -16207, ty = TYMED_HGLOBAL, asp = DVASPECT_CONTENT)
Returning null.
GetData(cf = -15797, ty = TYMED_HGLOBAL, asp = DVASPECT_CONTENT)
Returning null.
SetData(cf = -16206, ty = TYMED_HGLOBAL, asp = DVASPECT_CONTENT)
GetData(cf = -16206, ty = TYMED_HGLOBAL, asp = DVASPECT_CONTENT)
Returning null.
GetData(cf = -15832, ty = TYMED_HGLOBAL, asp = DVASPECT_CONTENT)
Returning null.
GetData(cf = -16207, ty = TYMED_HGLOBAL, asp = DVASPECT_CONTENT)
Returning null.
GetData(cf = -15797, ty = TYMED_HGLOBAL, asp = DVASPECT_CONTENT)
Returning null.
SetData(cf = -16206, ty = TYMED_HGLOBAL, asp = DVASPECT_CONTENT)
GetData(cf = -16206, ty = TYMED_HGLOBAL, asp = DVASPECT_CONTENT)
Returning null.
GetData(cf = -15832, ty = TYMED_HGLOBAL, asp = DVASPECT_CONTENT)
Returning null.
GetData(cf = -16207, ty = TYMED_HGLOBAL, asp = DVASPECT_CONTENT)
Returning null.
GetData(cf = -15797, ty = TYMED_HGLOBAL, asp = DVASPECT_CONTENT)
Returning null.
SetData(cf = -16206, ty = TYMED_HGLOBAL, asp = DVASPECT_CONTENT)
GetData(cf = -16206, ty = TYMED_HGLOBAL, asp = DVASPECT_CONTENT)
Returning null.
GetData(cf = -15832, ty = TYMED_HGLOBAL, asp = DVASPECT_CONTENT)
Returning null.
GetData(cf = -16207, ty = TYMED_HGLOBAL, asp = DVASPECT_CONTENT)
Returning null.
GetData(cf = -15797, ty = TYMED_HGLOBAL, asp = DVASPECT_CONTENT)
Returning null.
SetData(cf = -16206, ty = TYMED_HGLOBAL, asp = DVASPECT_CONTENT)
GetData(cf = -16206, ty = TYMED_HGLOBAL, asp = DVASPECT_CONTENT)
Returning null.
GetData(cf = -15832, ty = TYMED_HGLOBAL, asp = DVASPECT_CONTENT)
Returning null.
GetData(cf = -16207, ty = TYMED_HGLOBAL, asp = DVASPECT_CONTENT)
Returning null.
SetData(cf = -16207, ty = TYMED_HGLOBAL, asp = DVASPECT_CONTENT)
SetData(cf = -15864, ty = TYMED_HGLOBAL, asp = DVASPECT_CONTENT)
SetData(cf = -15835, ty = TYMED_HGLOBAL, asp = DVASPECT_CONTENT)

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[相关代码]

public void GetData(ref FORMATETC format, out STGMEDIUM medium)
{
    Debug.WriteLine($"GetData(cf = {format.cfFormat}, ty = {format.tymed}, asp = {format.dwAspect})");

    if (format.cfFormat == CF_HDROP &&
        (format.tymed & TYMED.TYMED_HGLOBAL) == TYMED.TYMED_HGLOBAL)
    {
        Debug.WriteLine("Returning file drop data");
        var mem = CreateDropFiles(new[] { file1, file2 
        });

        medium = new STGMEDIUM();
        medium.tymed = TYMED.TYMED_HGLOBAL;
        medium.unionmember = mem;
        medium.pUnkForRelease = IntPtr.Zero;
    }
    else
    {
        Debug.WriteLine("Returning null.");
        medium = new STGMEDIUM();
        medium.tymed = TYMED.TYMED_NULL;
        medium.unionmember = IntPtr.Zero;
        medium.pUnkForRelease = IntPtr.Zero;
    }
}

public int QueryGetData(ref FORMATETC format)
{
    Debug.WriteLine($"QueryGetData(cf = {format.cfFormat}, ty = {format.tymed}, asp = {format.dwAspect})");
    if (format.cfFormat == CF_HDROP)
        return S_OK;
    else
        return DV_E_FORMATETC;
}

public void SetData(ref FORMATETC formatIn, ref STGMEDIUM medium, bool release)
{
    Debug.WriteLine($"SetData(cf = {formatIn.cfFormat}, ty = {formatIn.tymed}, asp = {formatIn.dwAspect})");
}

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我使用了FORMATETCin System.Runtime.InteropServices.ComTypes，它具有public short cfFormat，但是在Windows的API中，它定义为CLIPFORMAT cfFormat，后者typedef WORD CLIPFORMAT依次为typedef unsigned short WORD;。因此，对我而言，类型不匹配（短和无符号短）。我不确定这是否重要。

Answer 1

Ano*_*ard 5

首先，您可以正确声明类型不匹配。剪贴板格式是无符号的。让我们取一个值：

-16230

被视为带符号WORD，这是

0xC09A

这并不奇怪。RegisterClipboardFormat的文档说：

注册的剪贴板格式由0xC000到0xFFFF范围内的值标识。

剪贴板格式的文档中提到了其他可能的值：

应用程序可以通过在CF_PRIVATEFIRST到CF_PRIVATELAST范围内定义一个值来标识私有剪贴板格式

CF_PRIVATEFIRST通过CF_PRIVATELAST映射0x0200到0x02FF。

显然，您会看到一种注册的剪贴板格式。要查看其真正的类型，您需要GetClipboardFormatName在遇到该值时调用。它可能会不时更改，因为这些值是在不同组件注册其剪贴板格式时发出的。

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