private void SendBytes(IntPtr pointer, int byteCount)
{
if (!RawPrinterAccess.WritePrinter(this.PrinterHandle, pointer, byteCount, out _))
{
int errorCode = WindowsApi.GetLastErrorCode();
string errorMessage = WindowsApi.GetErrorMessage(errorCode);
throw new Win32Exception(errorCode, errorMessage);
}
}
private void Dispose(bool disposing)
{
if (this.PrinterHandle != IntPtr.Zero)
{
RawPrinterAccess.EndPagePrinter(this.PrinterHandle);
RawPrinterAccess.EndDocPrinter(this.PrinterHandle);
RawPrinterAccess.ClosePrinter(this.PrinterHandle);
this.PrinterHandle = IntPtr.Zero;
}
}
/// <summary>
/// Opens the raw access to the printer and starts printing a new document.
/// </summary>
/// <param name="documentName"> The name of the document to print. </param>
/// <remarks>
/// <para>
/// <paramref name="documentName" /> is only used for informational purposes, e.g. it is displayed in the Windows
/// printer window which lists the document being printed.
/// </para>
/// <para>
/// Printing does not start until <see cref="WriteString(string)" />, <see cref="WriteString(string,Encoding)" />,
/// or <see cref="WriteBytes" /> is called.
/// </para>
/// </remarks>
/// <exception cref="ArgumentNullException"> <paramref name="documentName" /> is null. </exception>
/// <exception cref="ArgumentException"> <paramref name="documentName" /> is an empty string. </exception>
/// <exception cref="InvalidOperationException"> The printer is already open. </exception>
/// <exception cref="Win32Exception"> A system error ocurred while opening the printer or starting a new document. </exception>
public void Open(string documentName)
{
if (documentName == null)
{
throw new ArgumentNullException(nameof(documentName));
}
if (string.IsNullOrWhiteSpace(documentName))
{
throw new ArgumentException("The string is empty.", nameof(documentName));
}
if (this.IsOpen)
{
throw new InvalidOperationException("The printer is already open.");
}
GC.ReRegisterForFinalize(this);
bool success = false;
try
{
IntPtr hPrinter;
if (RawPrinterAccess.OpenPrinter(this.PrinterDevice.PrinterName.Normalize(), out hPrinter, IntPtr.Zero))
{
this.PrinterHandle = hPrinter;
DOCINFOA di = new DOCINFOA();
di.pDocName = documentName;
di.pDataType = RawPrinterAccess.RawDataType;
if (RawPrinterAccess.StartDocPrinter(hPrinter, 1, di))
{
if (RawPrinterAccess.StartPagePrinter(hPrinter))
{
success = true;
return;
}
}
}
int errorCode = WindowsApi.GetLastErrorCode();
string errorMessage = WindowsApi.GetErrorMessage(errorCode);
throw new Win32Exception(errorCode, errorMessage);
}
finally
{
if (!success)
{
this.Close();
}
}
}