Question:
Is there any way to detect how many jobs are in the Windows print
spooler at any given time?
Answer:
The Windows print spooler regularly broadcasts a system wide
WM_SPOOLERSTATUS message each time a job is added or deleted from the
spooler que. The following example demonstrates trapping for this
message.
Example:
type
TForm1 = class(TForm)
Label1: TLabel;
private
{ Private declarations }
procedure WM_SpoolerStatus(var Msg : TWMSPOOLERSTATUS);
message WM_SPOOLERSTATUS;
public
{ Public declarations }
end;
var
Form1: TForm1;
implementation
{$R *.DFM}
procedure TForm1.WM_SpoolerStatus(var Msg : TWMSPOOLERSTATUS);
begin
Lable1.Caption := IntToStr(msg.JobsLeft) +
' Jobs currenly in spooler';
msg.Result := 0;
end;