/// <summary>
/// Send the print job to Meteor. When the method returns, all print data has been
/// sent to Meteor - however, it has not necessarily all been sent to the hardware.
/// </summary>
/// <returns>Success / failure</returns>
public eRET Start()
{
eRET rVal;
// Meteor command to start a print job
int[] StartJobCmd = new int[] {
(int)CtrlCmdIds.PCMD_STARTJOB, // Command ID
4, // Number of DWORD parameters
jobid, // Job ID
(int)eJOBTYPE.JT_PRELOAD, // This job uses the preload data path
(int)eRES.RES_HIGH, // Print at full resolution
image.GetDocWidth() + 2 // Needed for Left-To-Right printing only
};
// A start job command can fail if there is an existing print job
// ready or printing in Meteor, or if a previous print job is still
// aborting. The sequencing of the main form's control enables should
// guarantee that thie never happens in this application.
if ((rVal = PrinterInterfaceCLS.PiSendCommand(StartJobCmd)) != eRET.RVAL_OK)
{
return(rVal);
}
// The start document command specifies the number of discrete copies
// of the image which are required
//
int[] StartDocCmd = new int[] {
(int)CtrlCmdIds.PCMD_STARTPDOC, // Command ID
1, // DWORD parameter count
repeatmode == (REPEAT_MODE.DISCRETE) ? copies : 1
};
if ((rVal = PrinterInterfaceCLS.PiSendCommand(StartDocCmd)) != eRET.RVAL_OK)
{
return(rVal);
}
// For seamless image repeats using the prelod data path, PCMD_REPEAT
// must be sent after PCMD_STARTPDOC and before the image data.
//
if (copies > 1 && repeatmode == REPEAT_MODE.SEAMLESS)
{
int[] RepeatCmd = new int[] {
(int)CtrlCmdIds.PCMD_REPEAT, // Command ID
1, // DWORD parameter cound
copies
};
if ((rVal = PrinterInterfaceCLS.PiSendCommand(RepeatCmd)) != eRET.RVAL_OK)
{
return(rVal);
}
}
// PCMD_BIGIMAGE must be used if the application needs to pass images
// which exceed 60MB in size to Meteor as one buffer. (An alternative
// is for the application to split up the data into smaller images,
// each of which can used PCMD_IMAGE).
//
// The image data is sent through the Printer Interface to the Meteor
// Print Engine in chunks. The application must continually call
// PiSendCommand with the same buffer while the Print Engine
// returns RVAL_FULL.
//
// Note that it is necessary to fix the location of the image command
// in memory while carrying out this sequence, to prevent the garbage
// collector from relocating the buffer (theoretically possible, but
// highly unlikely) between successive PiSendCommand calls.
//
int[] ImageCmd = image.GetBigImageCommand(ytop, bpp);
unsafe
{
fixed(int *pImageCmd = ImageCmd)
{
do
{
rVal = PrinterInterfaceCLS.PiSendCommand(ImageCmd);
} while (rVal == eRET.RVAL_FULL);
if (rVal != eRET.RVAL_OK)
{
return(rVal);
}
}
}
int[] EndDocCmd = new int[] { (int)CtrlCmdIds.PCMD_ENDDOC, 0 };
if ((rVal = PrinterInterfaceCLS.PiSendCommand(EndDocCmd)) != eRET.RVAL_OK)
{
return(rVal);
}
int[] EndJobCmd = new int[] { (int)CtrlCmdIds.PCMD_ENDJOB, 0 };
if ((rVal = PrinterInterfaceCLS.PiSendCommand(EndJobCmd)) != eRET.RVAL_OK)
{
return(rVal);
}
return(eRET.RVAL_OK);
}
/// <summary>
/// Load the data for a new print image
/// </summary>
private void LoadImage()
{
// Attempt to avoid memory allocation problems with large images by
// cleaning up the currently loading image. For very large images
// the 64 bit build of the application should be used.
if (image != null)
{
pictureBoxPrintData.Image = null;
image.Dispose();
image = null;
pictureBoxPrintData.Refresh();
}
GC.Collect();
// Load the new image
Cursor.Current = Cursors.WaitCursor;
string FileName = openFileDialogLoadImage.FileName;
image = ImageDataFactory.Create(FileName);
if (image != null)
{
pictureBoxPrintData.Image = image.GetPreviewBitmap();
Cursor.Current = Cursors.Default;
toolStripStatusFilename.Text = image.GetBaseName();
toolStripStatusFilename.ToolTipText = FileName;
toolStripStatusImageDimensions.Text = string.Format("{0} x {1} pixels", image.GetDocWidth(), image.GetDocHeight());
}
else
{
Cursor.Current = Cursors.Default;
MessageBox.Show("Failed to load image " + openFileDialogLoadImage.FileName,
Application.ProductName, MessageBoxButtons.OK, MessageBoxIcon.Exclamation);
openFileDialogLoadImage.FileName = "";
toolStripStatusFilename.Text = "No image loaded";
toolStripStatusFilename.ToolTipText = "";
toolStripStatusImageDimensions.Text = "";
}
EnableControls();
}
