C# Definition:

  [StructLayout(LayoutKind.Sequential, CharSet = CharSet.Unicode)]
  struct DOC_INFO_1W {
    [MarshalAs(UnmanagedType.LPWStr)]
    public string pDocName;
    [MarshalAs(UnmanagedType.LPWStr)]
    public string pOutputFile;
    [MarshalAs(UnmanagedType.LPWStr)]
    public string pDataType;
  }

VB.NET Definition:

  <StructLayout(LayoutKind.Sequential, CharSet:=CharSet.Unicode)> _
  Structure DOC_INFO_1W
      <MarshalAs(UnmanagedType.LPWStr)> Public pDocName As String
      <MarshalAs(UnmanagedType.LPWStr)> Public pOutputFile As String
      <MarshalAs(UnmanagedType.LPWStr)> Public pDataType As String
  End Structure!!!!User-Defined Field Types:

None.

/// <summary>Windows GDI DOC_INFO structure</summary>

[StructLayout(LayoutKind.Sequential)]

public class DOC_INFO

{

    /// <summary>
    /// Specifies the size, in bytes, of the structure
    /// Once the struct is initialsed use "cbSize = Marshal.SizeOf("the_structure_name") to set the value for cbSize correctly"
    /// </summary>
    public int cbSize = 0;
    /// <summary>Pointer to a null-terminated string that specifies the name of the document</summary>
    [MarshalAs(UnmanagedType.LPStr)]
    public string pDocName = null;
    ///<summary>output file name (or NULL for a printer)</summary>
    [MarshalAs(UnmanagedType.LPStr)]
    public string pOutputFile = null;
    /// <summary>Pointer to a null-terminated string that specifies the type of data used to record the print job.Can be null</summary>
    [MarshalAs(UnmanagedType.LPStr)]
    public string pDataType = null;
    /// <summary>
    /// Specifies additional information about the print job. This member must be zero or a set value
    /// </summary>        
    public Int32 fwType = 0;

}

Notes:

Different from the Ansi invoke! (Unicode uses LPStr)

User-Defined Field Types:

None.

Notes:

Used in the StartDoc function in the gdi32.dll

code snippet

DOC_INFO doc_info = new DOC_INFO();

doc_info.cbSize = Marshal.SizeOf(doc_info);

doc_info.pDocName = filename.ToString();

doc_info.pDataType = null;

doc_info.fwType = 0;

doc_info.pOutputFile = null;

// get printer hDC

StartDoc(hDC, doc_info);

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