StartDocW EasyHook

gistfile1.cs

[UnmanagedFunctionPointer(CallingConvention.StdCall, SetLastError = true)]
public delegate Int32 DStartDocW(IntPtr hPrinter, IntPtr di);

[DllImport("Gdi32.dll", EntryPoint = "StartDocW", SetLastError = true, CallingConvention = CallingConvention.StdCall)]
public static extern Int32 StartDocW(IntPtr hPrinter, IntPtr di);

//hook
public Int32 StartDocW_Hooked(IntPtr InPrinterHandle, IntPtr InData)
{
  //create XML file
  //create PDF printer handle
  IntPtr PDFPrinterHandle;
  createPDFPrinterHandle(out PDFPrinterHandle);
  //return StartDocW method result with PDF Printer handle
  return StartDocW(PDFPrinterHandle, InData);
}