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首页 > 解决方案 > 什么是 Windows 剪贴板 CF_ 格式，如 -16230、-15835、-15834 等？

c# - 什么是 Windows 剪贴板 CF_ 格式，如 -16230、-15835、-15834 等？

问题描述

我能找到的所有格式都在 MS 文档中。在尝试实现文件拖放（从我的应用程序到 Windows 的文件资源管理器）时，我收到很多对-16230、-15835、-15834 等值的GetData请求cfFormat，但我不知道它们是什么。

[当我尝试使用该功能将文件名从我的应用程序拖到文件资源管理器时的完整日志DoDragDrop。]

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)

【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})");
}

我使用了FORMATETCin System.Runtime.InteropServices.ComTypes，它有public short cfFormat，但是在 Windows 的 API 中，它被定义为CLIPFORMAT cfFormat， which 又typedef WORD CLIPFORMAT， which 又typedef unsigned short WORD;。所以，对我来说，类型不匹配（短和无符号短）。我不确定这是否重要。

标签： c#winapi

解决方案

首先，你说你有类型不匹配是对的。剪贴板格式未签名。让我们取一个值：

-16230

被视为一个签名的 WORD，这是

0xC09A

这不足为奇。RegisterClipboardFormat的文档是这样说的：

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：

应用程序可以通过定义 CF_PRIVATEFIRST 到 CF_PRIVATELAST 范围内的值来识别私有剪贴板格式

CF_PRIVATEFIRST通过CF_PRIVATELAST映射0x0200到0x02FF。

显然，您会看到其中一种已注册的剪贴板格式。要查看它到底是什么类型，您需要GetClipboardFormatName在遇到值时调用。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分发的。

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