| surwassu |
06-15-2011 08:34 AM |
Printing jobs management
Hi ,Guys
I am developing one program to manage printing job through CUPS.Please find following source code for it.
Code:
#include <cups/cups.h>
#include<cups/http.h>
/*
* Local functions...
*/
static void do_job_op(http_t *http, int job_id, ipp_op_t op);
/*
* 'main()' - Main entry for CGI.
*/
int /* O - Exit status */
main(int argc, /* I - Number of command-line arguments */
char *argv[]) /* I - Command-line arguments */
{
http_t *http; /* Connection to the server */
const char *op; /* Operation name */
//const char *job_id_var; /* Job ID form variable */
int job_id; /* Job ID */
http = httpConnectEncrypt(cupsServer(), ippPort(), cupsEncryption());
/*
* Get the job ID, if any...
*/
if(argc >= 2)
{
job_id = atoi(argv[2]);
}else{
job_id = 0;
}
op = argv[1];
/*
* Do the operation...
*/
if (op != NULL && job_id > 0)
{
/*
* Do the operation...
*/
if (!strcmp(op, "cancel-job"))
do_job_op(http, job_id, IPP_CANCEL_JOB);
else if (!strcmp(op, "hold-job"))
{
do_job_op(http, job_id, IPP_HOLD_JOB);
}
else if (!strcmp(op, "release-job"))
do_job_op(http, job_id, IPP_RELEASE_JOB);
else if (!strcmp(op, "restart-job"))
do_job_op(http, job_id,IPP_RESTART_JOB);
else
{
/*
* Bad operation code... Display an error...
*/
printf("\n\t\tBad operation\n");
}
}
else
{
/*
* Show a list of jobs...
*/
printf("\n\t\tSpecify Correct operation or job id\n");
}
/*
* Close the HTTP server connection...
*/
httpClose(http);
/*
* Return with no errors...
*/
return (0);
}
/*
* 'do_job_op()' - Do a job operation.
*/
static void
do_job_op(http_t *http, /* I - HTTP connection */
int job_id, /* I - Job ID */
ipp_op_t op) /* I - Operation to perform */
{
ipp_t *request; /* IPP request */
char uri[HTTP_MAX_URI]; /* Job URI */
//const char *user; /* Username */
/*
* Build a job request, which requires the following
* attributes:
*
* attributes-charset
* attributes-natural-language
* job-uri or printer-uri (purge-jobs)
* requesting-user-name
*/
request = ippNewRequest(op);
snprintf(uri, sizeof(uri), "ipp://localhost/jobs/%d", job_id);
ippAddString(request, IPP_TAG_OPERATION, IPP_TAG_URI, "job-uri",
NULL, uri);
ippAddString(request, IPP_TAG_OPERATION, IPP_TAG_NAME,
"requesting-user-name", NULL, cupsUser());
/*
* Do the request and get back a response...
*/
ippDelete(cupsDoRequest(http, request, "/jobs"));
if (cupsLastError() <= IPP_OK_CONFLICT && getenv("HTTP_REFERER"))
{
/*
* Redirect successful updates back to the parent page...
*/
char url[1024]; /* Encoded URL */
strcpy(url, "5;URL=");
}
else if (cupsLastError() == IPP_NOT_AUTHORIZED)
{
puts("Status: 401\n");
exit(0);
}
if (cupsLastError() > IPP_OK_CONFLICT){
printf("lpstat: %s\n", cupsLastErrorString());
printf("Job operation failed:");
}
else if (op == IPP_CANCEL_JOB)
printf("job-cancel");
else if (op == IPP_HOLD_JOB)
printf("hold-printer");
else if (op == IPP_RELEASE_JOB)
printf("job-release");
else if (op == IPP_RESUBMIT_JOB)
printf("job-restart");
}
when you run this code, you have to give two parameter first operation to be performed eg.hold-job,release-job,cancel-job,restart-job.Second paramter must be job id.
I got a machine from company which is having internal printer ,so first I am printing a file through command line(lp command) and in another session I am running my code for job management.
problem:
1.for cancel & hold job code is working perfectly fine.
2.when i hold a job & release it for resume printing it reprint the job i.e.it restarts printing same job(I am using IPP_RELEASE_JOB request)
so Is there any way to resume document printing?
3.When i hold a job and say restart then it shows me error like (job_id) is not completed.It means that printer is not going to accept any further operation until current one is finished.
4.Is there any way to get out of this????
Guys I searched CUPS docs but still uncleared how to resolve these issues?
Please help me guys
Regards,
Sumit |
