C＃-如何从EMF Plus双文件（增强型图元文件）枚举和仅获取GDI记录

Question

由于EMF Plus dual具有GDI +记录和GDI记录（根据以下提到的来源）：

https://docs.microsoft.com/en-us/windows/desktop/gdiplus/-gdiplus-metafiles-about

我需要找到一种枚举并仅获取GDI记录的方法。非常感谢您的帮助。

我使用以下代码枚举EMF文件，但它仅返回EMF加双图元文件格式的GDI +记录

Metafile curMetafile = new Metafile("sample.emf");

Graphics.EnumerateMetafileProc enumMetaCB = new Graphics.EnumerateMetafileProc(EnumFunction);

Form f = new Form();

f.ShowIcon = false;
f.Visible = false;
f.ShowInTaskbar = false;
f.Show();

Graphics g = f.CreateGraphics();
g.Clear(f.BackColor);
g.EnumerateMetafile(curMetafile, new Point(0, 0), enumMetaCB);

if (sw != null)
    sw.Close();

f.Close();

curMetafile.Dispose();

g.Dispose();

public bool EnumFunction(EmfPlusRecordType recordType, int flags, int dataSize, IntPtr data, PlayRecordCallback cd)
{
    byte[] dataArray = null;

    if (data != IntPtr.Zero)
    {
        dataArray = new byte[dataSize];
        Marshal.Copy(data, dataArray, 0, dataSize);
    }

    StringBuilder sb = new StringBuilder();

    /* Convert binary data to hex String */
    for (int i = 0; i < dataSize; ++i)
    {
        string DAT = Convert.ToString(dataArray[i], 16).ToUpper();

        if (DAT.Length == 1)
            DAT = "0" + DAT;

        sb.Append(DAT + " ");
    }

    if (sw != null)
        sw.WriteLine(recordType.ToString() + " " + flags + "(" + dataSize + " bytes) " /*+ sb.ToString()*/);
    else
        Console.Out.WriteLine(recordType.ToString() + " " + flags + "(" + dataSize + " bytes) " /*+ sb.ToString()*/);

    return true;
}