/// <summary>
/// Initializes a new instance of the <see cref='Metafile'/> class with the specified filename.
/// </summary>
public unsafe Metafile(Stream stream, IntPtr referenceHdc, Rectangle frameRect, MetafileFrameUnit frameUnit, EmfType type, string?description)
{
using DrawingCom.IStreamWrapper streamWrapper = DrawingCom.GetComWrapper(new GPStream(stream));
IntPtr metafile = IntPtr.Zero;
if (frameRect.IsEmpty)
{
Gdip.CheckStatus(Gdip.GdipRecordMetafileStream(
streamWrapper.Ptr,
referenceHdc,
type,
IntPtr.Zero,
frameUnit,
description,
&metafile));
}
else
{
Gdip.CheckStatus(Gdip.GdipRecordMetafileStreamI(
streamWrapper.Ptr,
referenceHdc,
type,
&frameRect,
frameUnit,
description,
&metafile));
}
SetNativeImage(metafile);
}
/// <summary>
/// Initializes a new instance of the <see cref='Metafile'/> class from the specified stream.
/// </summary>
public unsafe Metafile(Stream stream)
{
ArgumentNullException.ThrowIfNull(stream);
using DrawingCom.IStreamWrapper streamWrapper = DrawingCom.GetComWrapper(new GPStream(stream));
IntPtr metafile = IntPtr.Zero;
Gdip.CheckStatus(Gdip.GdipCreateMetafileFromStream(streamWrapper.Ptr, &metafile));
SetNativeImage(metafile);
}
/// <summary>
/// Initializes a new instance of the <see cref='Metafile'/> class from the specified data stream.
/// </summary>
public unsafe Metafile(Stream stream, IntPtr referenceHdc, EmfType type, string?description)
{
using DrawingCom.IStreamWrapper streamWrapper = DrawingCom.GetComWrapper(new GPStream(stream));
IntPtr metafile = IntPtr.Zero;
Gdip.CheckStatus(Gdip.GdipRecordMetafileStream(
streamWrapper.Ptr,
referenceHdc,
type,
IntPtr.Zero,
MetafileFrameUnit.GdiCompatible,
description,
&metafile));
SetNativeImage(metafile);
}
/// <summary>
/// Returns the <see cref='MetafileHeader'/> associated with the specified <see cref='Metafile'/>.
/// </summary>
public static MetafileHeader GetMetafileHeader(Stream stream)
{
MetafileHeader header;
IntPtr memory = Marshal.AllocHGlobal(Marshal.SizeOf(typeof(MetafileHeaderEmf)));
try
{
using DrawingCom.IStreamWrapper streamWrapper = DrawingCom.GetComWrapper(new GPStream(stream));
Gdip.CheckStatus(Gdip.GdipGetMetafileHeaderFromStream(streamWrapper.Ptr, memory));
int[] type = new int[] { 0 };
Marshal.Copy(memory, type, 0, 1);
MetafileType metafileType = (MetafileType)type[0];
header = new MetafileHeader();
if (metafileType == MetafileType.Wmf ||
metafileType == MetafileType.WmfPlaceable)
{
// WMF header
header.wmf = (MetafileHeaderWmf)Marshal.PtrToStructure(memory, typeof(MetafileHeaderWmf)) !;
header.emf = null;
}
else
{
// EMF header
header.wmf = null;
header.emf = (MetafileHeaderEmf)Marshal.PtrToStructure(memory, typeof(MetafileHeaderEmf)) !;
}
}
finally
{
Marshal.FreeHGlobal(memory);
}
return(header);
}
