Title: Get the Number of Printer Jobs
Question: How to get the number of jobs in the windows spooler for a
specific printer.
You may want your Application to limit the number of jobs in the spooler to avoid the loss of data.
Answer:
uses Windows, SysUtils, Printers, WinSpool;
{**************************************************************************
* NAME: PrinterJobsCount
* DESC: Get the number of jobs in the windows printer spooler
* PARAMS: PrinterName
* RESULT: Number of printer jobs
* CREATED: 27-05-2002/Andreas Schmidt
*************************************************************************}
function PrinterJobsCount(const PrinterName : String) : Integer;
var
hPrinter : THandle;
PPI2 : PPrinterInfo2;
dwNeeded : DWORD;
begin
Result := -1;
// open the printer
if NOT OpenPrinter(PChar(PrinterName), hPrinter, Nil) then
raise EPrinter.Create('Can''t open printer: '+PrinterName+
#13+SysErrorMessage(GetLastError));
try
// just get the amount of needed memory
GetPrinter(hPrinter, 2, Nil, 0, @dwNeeded);
// allocate the memory
GetMem(PPI2, dwNeeded);
try
// get the printer information
if NOT GetPrinter(
hPrinter, // handle to printer
2, // information level
PPI2, // printer information buffer
dwNeeded, // size of buffer
@dwNeeded // bytes received or required
)
then
raise EPrinter.Create('Error getting information for printer: '+
PrinterName+#13+SysErrorMessage(GetLastError));
Result := PPI2^.cJobs;
finally
FreeMem(PPI2);
end;
finally
ClosePrinter(hPrinter);
end;
end;