public static bool ReadFromPrinter(string szPrinterName, IntPtr pBytes, Int32 dwCount)
{
// Read the data from the printer.
Int32 dwError = 0, dwBytesRead = 0;
IntPtr hPrinter = new IntPtr(0);
NativeMethods.DOCINFOA di = new NativeMethods.DOCINFOA();
NativeMethods.PRINTER_DEFAULTS pd = new NativeMethods.PRINTER_DEFAULTS();
pd.DesiredAccess = 0x00000020;
bool bSuccess = false;
// Open the printer.
if (NativeMethods.OpenPrinter2(szPrinterName.Normalize(), out hPrinter, pd))
{
// Start a document.
if (NativeMethods.StartDocPrinter(hPrinter, 1, di))
{
// Start a page.
if (NativeMethods.StartPagePrinter(hPrinter))
{
// read your bytes.
bSuccess = NativeMethods.ReadPrinter(hPrinter, out pBytes, dwCount, out dwBytesRead);
// If you did not succeed, GetLastError may give more information
// about why not.
if (bSuccess == false)
{
dwError = Marshal.GetLastWin32Error();
}
NativeMethods.EndPagePrinter(hPrinter);
}
NativeMethods.EndDocPrinter(hPrinter);
}
NativeMethods.ClosePrinter(hPrinter);
}
return(bSuccess);
}
/// <summary>
/// Send unmanaged data to the target printer.
/// When the function is given a printer name and an unmanaged array
/// of bytes, the function sends those bytes to the print queue.
/// Returns true on success, false on failure.
/// </summary>
/// <param name="szPrinterName">String name of printer</param>
/// <param name="pBytes">Pointer to data</param>
/// <param name="dwCount">Length of data in bytes</param>
/// <returns>bool</returns>
public static bool SendBytesToPrinter(string szPrinterName, IntPtr pBytes, Int32 dwCount)
{
Int32 dwError = 0, dwWritten = 0;
IntPtr hPrinter = new IntPtr(0);
NativeMethods.DOCINFOA di = new NativeMethods.DOCINFOA();
bool bSuccess = false; // Assume failure unless you specifically succeed.
di.pDocName = "ESCPOSTTester";
di.pDataType = "RAW";
// Open the printer.
if (NativeMethods.OpenPrinter(szPrinterName.Normalize(), out hPrinter, IntPtr.Zero))
{
// Start a document.
if (NativeMethods.StartDocPrinter(hPrinter, 1, di))
{
// Start a page.
if (NativeMethods.StartPagePrinter(hPrinter))
{
bSuccess = NativeMethods.WritePrinter(hPrinter, pBytes, dwCount, out dwWritten);
NativeMethods.EndPagePrinter(hPrinter);
}
NativeMethods.EndDocPrinter(hPrinter);
}
NativeMethods.ClosePrinter(hPrinter);
}
// If you did not succeed, GetLastError may give more information
// about why not.
if (bSuccess == false)
{
dwError = Marshal.GetLastWin32Error();
}
return(bSuccess);
}
