Creating a Background Job in Visual Studio .NET

Drawer Denso QR Bar Code in Visual Studio .NET Creating a Background Job
Creating a Background Job
QR Maker In Visual Studio .NET
Using Barcode creation for .NET framework Control to generate, create QR Code image in .NET applications.
Program 6-3 is the job shell that prompts the user for one of three commands and then carries out the command This program uses a collection of job management functions, which are shown in Program 64, 6-5, and 6-6
QR Scanner In .NET Framework
Using Barcode decoder for Visual Studio .NET Control to read, scan read, scan image in Visual Studio .NET applications.
Program 6-3 JobShell: Create, List, and Kill Background Jobs
Generating Bar Code In .NET Framework
Using Barcode creator for VS .NET Control to generate, create bar code image in Visual Studio .NET applications.
/* 6 */ /* JobShellc -- job management commands: jobbg -- Run a job in the background jobs -- List all background jobs kill -- Terminate a specified job of job family There is an option to generate a console control signal */ #include "EvryThngh" #include "JobMgth"
Scanning Barcode In VS .NET
Using Barcode decoder for VS .NET Control to read, scan read, scan image in Visual Studio .NET applications.
int _tmain (int argc, LPTSTR argv []) { BOOL Exit = FALSE; TCHAR Command [MAX_COMMAND_LINE + 10], *pc; DWORD i, LocArgc; /* Local argc */ TCHAR argstr [MAX_ARG] [MAX_COMMAND_LINE]; LPTSTR pArgs [MAX_ARG]; for (i = 0; i < MAX_ARG; i++) pArgs [i] = argstr [i]; /* Prompt user, read command, and execute it */ _tprintf (_T ("Windows Job Management\n")); while (!Exit) { _tprintf (_T ("%s"), _T ("JM$")); _fgetts (Command, MAX_COMMAND_LINE, stdin); pc = strchr (Command, '\n'); *pc = '\0'; /* Parse the input to obtain command line for new job */ GetArgs (Command, &LocArgc, pArgs); /* See Appendix A */ CharLower (argstr [0]); if (_tcscmp (argstr [0], _T ("jobbg")) == 0) { Jobbg (LocArgc, pArgs, Command); } else if (_tcscmp (argstr [0], _T ("jobs")) == 0) { Jobs (LocArgc, pArgs, Command); } else if (_tcscmp (argstr [0], _T ("kill")) == 0) { Kill (LocArgc, pArgs, Command); } else if (_tcscmp (argstr [0], _T ("quit")) == 0) { Exit = TRUE; } else _tprintf (_T ("Illegal command Try again\n")); } return 0; } /* jobbg [options] command-line [Options are mutually exclusive] -c: Give the new process a console -d: The new process is detached, with no console If neither is set, the process shares console with jobbg */ int Jobbg (int argc, LPTSTR argv [], LPTSTR Command) { DWORD fCreate; LONG JobNo; BOOL Flags [2]; STARTUPINFO StartUp; PROCESS_INFORMATION ProcessInfo; LPTSTR targv = SkipArg (Command); GetStartupInfo (&StartUp); Options (argc, argv, _T ("cd"), &Flags [0], &Flags [1], NULL); /* Skip over the option field as well, if it exists */ if (argv [1] [0] == '-') targv = SkipArg (targv); fCreate = Flags [0] CREATE_NEW_CONSOLE : Flags [1] DETACHED_PROCESS : 0; /* Create job/thread suspended Resume once job entered */ CreateProcess (NULL, targv, NULL, NULL, TRUE, fCreate | CREATE_SUSPENDED | CREATE_NEW_PROCESS_GROUP,
Making Denso QR Bar Code In Visual C#.NET
Using Barcode printer for .NET framework Control to generate, create QR-Code image in .NET applications.
NULL, NULL, &StartUp, &ProcessInfo); /* Create a job number and enter the process ID and handle into the job "data base" */ JobNo = GetJobNumber (&ProcessInfo, targv); /* See "JobMgth" */ if (JobNo >= 0) ResumeThread (ProcessInfohThread); else { TerminateProcess (ProcessInfohProcess, 3); CloseHandle (ProcessInfohProcess); ReportError (_T ("Error: No room in job list"), 0, FALSE); return 5; } CloseHandle (ProcessInfohThread); CloseHandle (ProcessInfohProcess); _tprintf (_T (" [%d] %d\n"), JobNo, ProcessInfodwProcessId); return 0; } /* jobs: List all running or stopped jobs */ int Jobs (int argc, LPTSTR argv [], LPTSTR Command) { if (!DisplayJobs ()) return 1; /* See job mgmt functions */ return 0; } /* kill [options] JobNumber -b Generate a Ctrl-Break -c Generate a Ctrl-C Otherwise, terminate the process */ int Kill (int argc, LPTSTR argv [], LPTSTR Command) { DWORD ProcessId, JobNumber, iJobNo; HANDLE hProcess; BOOL CntrlC, CntrlB, Killed; iJobNo = Options (argc, argv, _T ("bc"), &CntrlB, &CntrlC, NULL); /* Find the process ID associated with this job */ JobNumber = _ttoi (argv [iJobNo]); ProcessId = FindProcessId (JobNumber); /* See job mgmt */ hProcess = OpenProcess (PROCESS_ALL_ACCESS, FALSE, ProcessId); if (hProcess == NULL) { /* Process ID may not be in use */ ReportError (_T ("Process already terminated\n"), 0, FALSE); return 2; } if (CntrlB) GenerateConsoleCtrlEvent (CTRL_BREAK_EVENT, ProcessId); else if (CntrlC) GenerateConsoleCtrlEvent (CTRL_C_EVENT, ProcessId); else TerminateProcess (hProcess, JM_EXIT_CODE); WaitForSingleObject (hProcess, 5000); CloseHandle (hProcess); _tprintf (_T ("Job [%d] terminated or timed out\n"), JobNumber); return 0; }
Generating QR Code JIS X 0510 In .NET
Using Barcode creation for ASP.NET Control to generate, create QR image in ASP.NET applications.
Notice how the jobbg command creates the process in the suspended state and then calls the job management function, GetJobNumber (Program 6-4), to get a new job number and to register the job and its associated process If the job cannot be registered for any reason, the job's process is terminated immediately Normally, the job number is generated correctly, and the primary thread is resumed and allowed to run
QR Code Encoder In Visual Basic .NET
Using Barcode maker for .NET Control to generate, create QR Code image in .NET framework applications.
Making Code-39 In Visual Studio .NET
Using Barcode drawer for VS .NET Control to generate, create Code 39 Full ASCII image in .NET framework applications.
Generate Data Matrix In .NET
Using Barcode drawer for .NET Control to generate, create Data Matrix ECC200 image in VS .NET applications.
Encoding RoyalMail4SCC In VS .NET
Using Barcode generator for .NET Control to generate, create British Royal Mail 4-State Customer Barcode image in .NET applications.
Barcode Drawer In .NET Framework
Using Barcode printer for ASP.NET Control to generate, create barcode image in ASP.NET applications.
Data Matrix ECC200 Generator In C#
Using Barcode maker for Visual Studio .NET Control to generate, create DataMatrix image in .NET applications.
UPC-A Scanner In .NET Framework
Using Barcode decoder for .NET framework Control to read, scan read, scan image in .NET applications.
Universal Product Code Version A Maker In Visual Studio .NET
Using Barcode encoder for ASP.NET Control to generate, create Universal Product Code version A image in ASP.NET applications.