PrintQueueWatch library Job.Transfer function access denied

Question

The function Job.Transfer result is access denied.

I checked the following things and still the function Job.Transfer dosen't work
1.- Permissions.
The user account running the application belong to the administrator group and has sufficient permissions on both printer.
Has permissions for print job, manage documents and manage printer.
2.- I create a instance of PrintQueeuWatch.PrinterInformation
PrinterQueueWatch.PrinterInformation PrinterInfo = new PrinterQueueWatch.PrinterInformation("HP LaserJet P1006", PrinterQueueWatch.SpoolerApiConstantEnumerations.PrinterAccessRights.Printer_Access_Administer, true))
3.- The two printers status is online
4.- In the app.manifest is configured with requiredAdministrator

try
{
using (PrinterQueueWatch.PrinterInformation PrinterInfo = new PrinterQueueWatch.PrinterInformation("HP LaserJet P1006", PrinterQueueWatch.SpoolerApiConstantEnumerations.PrinterAccessRights.Printer_Access_Administer, true))
    {
        var job = PrinterInfo.PrintJobs.get_ItemByJobId(Id); //the value of job is not null.
        if (job != null)
        {
            job.Transfer("Microsoft Print to PDF", false);
        }
        else
        {
            System.Diagnostics.Debug.WriteLine("Print job not found.");
        }
    }
}
catch (Exception ex)
{
    System.Diagnostics.Debug.WriteLine("Error: " + ex.Message);

}

Aman Gupta · Answer

Hi Jorge Carlos The Access Denied error when using the Job.Transfer function in the PrintQueueWatch library can occur for several reasons despite the steps you've already taken. Here are a few additional things to check and consider: 1. Spooler Service Permissions Ensure that the Print Spooler service has the necessary permissions to perform the job transfer. The spooler service might not have the required access to the destination printer especially if it involves a different printer queue or driver. 2. UAC and Elevation Even though the app is configured with requireAdministrator you might want to check if the process is indeed running with elevated privileges. You can do this by checking the process in Task Manager or explicitly running the application as an administrator. 3. Printer Driver Compatibility Ensure that the drivers for both the source and destination printers are compatible with each other. Some printers might have restrictions or special requirements for job transfers especially when moving jobs between different printer models or types. 4. Transfer Method Restrictions Some printers might have specific restrictions on job transfers especially if you're transferring to a virtual printer like Microsoft Print to PDF. The virtual printer might not support the same operations as a physical printer. 5. Windows Group Policy Check if there are any group policies in place that might restrict the ability to transfer print jobs between printers. Some security policies can restrict access to printer functions even for administrators. 6. Printer Queue State Even if the printer is online check the specific state of the printer queue. It might be paused or in a state that doesn't allow job transfers. You can try restarting the printer queue to clear any potential issues. 7. Error Handling Consider enhancing the error handling to capture more details about the access denied error. Sometimes additional information can be obtained by checking the inner exception or using specific Windows APIs to get more detailed error codes. 8. Alternative Approach If the issue persists consider an alternative approach such as creating a new print job in the destination printer rather than transferring the existing one. If you've tried all these and still face the issue it might be necessary to debug the library itself or check for any known issues with the PrintQueueWatch library in relation to your specific environment.