asked on

pausing a job

Dear experts

I am plying about with the WMI settings on C++

What i am trying to do is resume a paused job. However I cant do it with the SetJob command

It deletes the job but it doesnt resume

On both i am getting a result of 1 which indicates Setjob occured successfully

any idea how to fix this

I have set the printer to pause using SetPrinter
if thats the reason for my problems how do i pause a print job if the default settings of a printer are not set to pause?

INT MonitorPrinter(char *pPrinter)
{
	int iIndex = 0;
	DWORD dwNeeded, dwRet, dwPrinterStatus;
	HANDLE hPrinter=NULL; 
	HANDLE hWait;


	JOB_INFO_2  *pJobs=NULL;
	int iJobs, iTempIndex;
	int jobid=4;
	int c;
//	int id1=atoi(id);







	PRINTER_DEFAULTS pd;
	pd.pDatatype = NULL;
	pd.pDevMode = NULL;
	pd.DesiredAccess = PRINTER_ALL_ACCESS;


	if(!OpenPrinter(pPrinter,&hPrinter,&pd)) 
	{
		DisplayError("OpenPrinter Failed");
		return FALSE;
	}


	GetJobs(hPrinter,       
		&pJobs, /* Pointer to be filled.  */ 
		&iJobs,            /* Count of jobs filled.  */ 
	
		&dwPrinterStatus);         /* Print Queue status.    */ 

for (iIndex = 0; iIndex < iJobs; iIndex++)
	{

	int check =pJobs[iIndex].JobId;

		//if (id1 == check)
		
		{
	char *user="working";
	pJobs[0].pUserName=user;	
//	pJobs[0].pStatus=JOB_STATUS_PRINTING;
	printf("Username is %s\n", pJobs[0].pUserName);
	
	
	c =	SetJob(hPrinter, pJobs[iIndex].JobId, 2, (LPBYTE) pJobs,JOB_CONTROL_RESUME);

	printf("Result is %d\n",c);
}
}


	return (0);
}

Open in new window

jkr

'JOB_CONTROL_RELEASE' seems to be the problem - try

	c =	SetJob(hPrinter, pJobs[iIndex].JobId, 2, (LPBYTE) pJobs,JOB_CONTROL_RESUME);

Open in new window

samelamin

ASKER

Ive tried that too
Its why i changed it to JOB_CONTROL_RESUME, and ive updated the code

Zoppo

Hi samelamin,

is the job still deleted with 'JOB_CONTROL_RESUME'? Is it the same if you don't set a user name? What is 'GetJobs'? Is it a function you wrote? Seems not to be a GDI function ...

ZOPPO

samelamin

ASKER

It is yes
GetJobs will fill the Job_INFO_2 structure with the given jobs in the printer.

What is odd is i am using SetPrinter to change the default settings to pause, but when i print to it the job status is just "Ready" instead of paused

Even if i set aprint job to pause using the windows console and use SETJOB to change it to resume it still does not work

Ami not pausing the printer properly?

if (command==1)
	{
	
    SetPrinter(hPrinter, 0, NULL, PRINTER_CONTROL_PAUSE);

	printf("Setting printer %s to pause\n",Printer);
	}
	else if(command==2)
	{
	SetPrinter(hPrinter, 0, NULL, PRINTER_CONTROL_RESUME);
	printf("Setting printer %s to resume\n",Printer);

Open in new window

Zoppo

I'm not sure if I understand correctly, but if so I think you mix up printer and job status - if the printer is PAUSED a new job may even be READY - pausing and resuming the job won't do anything as long as the printer is PAUSED.

samelamin

ASKER

I thought so

So how do i set the printer to be paused to allow all jobs given to it to be paused?

samelamin

ASKER

IF i understand your comment Zoppe the underlying setting for a printer should be resume.

Given that how do i set all jobs given to it to be paused?

Zoppo

Hm - I'm not sure if there's an easy way - only thing I can think of is to set the printer to PAUSED, then set all jobs to be PAUSED, the re-set the printer to READY ... but thus you cannot ensure that i.e. a new printer job is started while the printer is READY - maybe there are ways to somehow implement that your app gets notified if a new print job is started, but unfortunateley I haven't such deep knowledge of the print/spooler stuff ...

samelamin

ASKER

I did that too but what i thought was once i set the printer to ready all the jobs will resume

samelamin

ASKER

OK i have a question

How do i pause a printer, because it isnt really paused its shown as ready, how do i make the status change to paused

Also Zoppo I tried your solution unfortunately when i pause a printer then print
the moment i change it to resume it resumes the first job in the queue

So it doesnt allow me to choose when i want to resume the job.

ASKER CERTIFIED SOLUTION

Zoppo

membership

This solution is only available to members.

To access this solution, you must be a member of Experts Exchange.

Start Free Trial

samelamin

ASKER

Thanks for this

But this will toggle the pause, when you toggle the resume do all jobs start resuming or do they stay paused?>

samelamin

ASKER

Yup it starts resuming everything as soon as i toggle it back so thats not going to work

Zoppo

When the printer's state is resumed using this code only those jobs which aren't paused start printing - the paused ones still keep as 'Paused' in the job list ...

samelamin

ASKER

oh I think i get you
You mean i have to:

1) Toggle printer to pause
2) print document then set status to pause
3)resume the printer

Is that what you mean?

Zoppo

Yes, exactly - changing printer's state doesn't anyhow affect the job's states, so you have to control them both ...

samelamin

ASKER

OK when i set a jobs status to pause it still doesnt chage its actual status from ready to pause

here is how i am changing the status

c =	SetJob(hPrinter, pJobs[iIndex].JobId, 2, (LPBYTE) pJobs,JOB_CONTROL_PAUSE);

Open in new window

samelamin

ASKER

Got it working

It was due to the fact i had pJobs refrenced. It should be NULL

Anyways thank you Zoppo

Its annoying to switch it to paused,print document and pause it, then again resume the printer

But oh well thank you

Zoppo

Fine, I'm glad I could help you so far. But, as told, there might be better solutions which I just don't know - i.e. there's a "Print Monitor API" which might give you the ability to intercept print-spooler calls, but I simply don't know if this can be used for your purpose since I never used it.

BTW: Are the print jobs started by your application or by third party applications? If it's yours you should be able to simply start the jobs in a resumed state ...

Have a nice day,

best regards,

ZOPPO

samelamin

ASKER

Well for testing purposes im just printing Test Pages so i suppose it is me who starts them

But in future it may be started by someone else but my application will always have admin rights