This class implements the Line Printer Daemon Protocol (LPR) as a client.

TIdLPR = class(TIdTCPClient)

This class implements the Line Printer Daemon Protocol (LPR) as a client. The protocol is used to add, remove, and get the status of print jobs from a spool on a remote computer. This protocol was developed around the Berkeley version of Unix and later formalized in RFC 1179.

This is the control file for the current print job.

property ControlFile: TIdLPRControlFile;

This is the control file for the current print job. The control file specifies the parameters for the print job and is sent when a request is sent to the LPR daemon.

Identifies the current print Job ID number.

property JobId: String;

JobId is a String property that identifies the print Job Identification number for LPR print job. Changing the value in JobID insures that JobID is less than 999. Values greater than or equal to 999 are ignored, and reset to 1 when the print job is generated. JobID is sent as a parameter to the OnLPRStatus event handler.

This is the name of the print queue (spool) that is used with the GetQueueState, Print, and PrintFile.

property Queue: String;

This is the name of the print queue (spool) that is used with the GetQueueState, Print, and PrintFile.

This constructor creates the TIdLPR object.

constructor Create(AOwner: TComponent); override;

Create

This constructor creates the TIdLPR object, sets the port to IdPORT_LPD, sets the BoundPortMin to 721, and sets BoundPortMax to 731. Create also sets the default value for Queue and JobId.

Frees the object instance.

destructor Destroy; override;

Destroy is the destructor for the TIdLPR object instance. Destroy frees resources allocated in the ControlFile property prior to calling the inherited Destroy method.

This method requests that the server send the status of print jobs in a spool.

function GetQueueState(const AShortFormat: Boolean = false; const AList: String = ''): String;

This parameter indicates if the daemon should send an abbreviated listing.

String - the status of the print jobs from the server.

This method requests that the server send the status of print jobs in a spool.

This method sends text to the daemon for printing.

procedure Print(AText: String); overload;
procedure Print(ABuffer: array of Byte); overload;

a string to be printed

An array of characters to print

Print is a method used to send output text to the LPR daemon for printing.

This method sends text to the daemon for printing.

procedure Print(AText: String); overload;
procedure Print(ABuffer: array of Byte); overload;

a string to be printed

An array of characters to print

Print is a method used to send output text to the LPR daemon for printing.

This sends a file to the daemon for printing.

procedure PrintFile(AFileName: String);

The file to be printed.

PrintFile is a method used to send the contents of a file to the LPR daemon for printing.

This method requests that the server print all of the print jobs that are waiting in the queue.

procedure PrintWaitingJobs;

This method requests that the server print all of the print jobs that are waiting in the queue specified by the TIdLPR.Queue property.

This requests that the daemon remove a list of jobs from its queue.

procedure RemoveJobList(AList: String; const AAsRoot: Boolean = False);

a list of print job numbers from the person specified in the ControlFile.UserName property or if the AsRoot parameter is true, this can be the UserNames whose jobs are to be deleted

If this parameter is true, the AList parameter can be this can be the UserNames whose jobs are to be deleted. If false, the only jobs that can be deleted are for the user specified in the ControlFile.UserName property. The root account is the system administrator or Unix Super User.

This requests that the daemon remove a list of jobs from its queue (specified in the Queue property).

This event is triggered to indicate the status of the TIdLPR object.

property OnLPRStatus: TIdLPRStatusEvent;

the object that triggered this event

The state of the TIdLPR queue

The JobID, an error message if AStatus equals psError, or the queue results if AStatus equals psQueueState.

This event is triggered to indicate the status of the TIdLPR object.