C# Signature:

[StructLayout(LayoutKind.Sequential, Pack = 1)]
public struct WmfPlaceableFileHeader
{
     public uint key;  // 0x9aC6CDD7
     public ushort hmf;
     public ushort bboxLeft;
     public ushort bboxTop;
     public ushort bboxRight;
     public ushort bboxBottom;
     public ushort inch;
     public uint reserved;
     public ushort checksum;
}

VB Signature:

TODO

User-Defined Types:

None.

Alternative Managed API:

None. .Net cannot save metafiles.

Notes:

None.

Tips & Tricks:

None.

Sample Code:

MetafileHeader mfh = Metafile.GetMetafileHeader(emfh);
const ushorttwips_per_inch = 1440;
header.key = 0x9aC6CDD7;  // magic number
header.hmf = 0;
header.bboxLeft = 0;
header.bboxRight = width_in_inches * twips_per_inch;
header.bboxTop = 0;
header.bboxBottom = height_in_inches * twips_per_inch;
header.inch = twips_per_inch;
header.reserved = 0;

// Calculate checksum for first 10 WORDs.
ushort checksum = 0;
byte[] header_bytes = StructureToByteArray(header);
for (int i = 0; i < 10; i++)
     checksum ^= BitConverter.ToUInt16(header_bytes, i * 2);
header.checksum = checksum;

// Construct the file in-memory.
header_bytes = StructureToByteArray(header);
stream.Write(header_bytes, 0, header_bytes.Length);
stream.Write(metafile_bits, 0, metafile_bits.Length);