Return: TRUE only if the process and thread are successfully created Parameters in Visual Studio .NET

Generate QR Code JIS X 0510 in Visual Studio .NET Return: TRUE only if the process and thread are successfully created Parameters
Return: TRUE only if the process and thread are successfully created Parameters
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Some parameters require extensive explanations in the following sections, and many are illustrated in the program examples lpApplicationName and lpCommandLine (this is an LPTSTR and not an LPCTSTR) together specify the executable program and the command line arguments, as explained in the next section lpsaProcess and lpsaThread point to the process and thread security attribute structures NULL values imply default security and will be used until 15, which covers Windows security bInheritHandles indicates whether the new process inherits copies of the calling process's inheritable open handles (files, mappings, and so on) Inherited handles have the same attributes as the originals and are discussed in detail in a later section
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dwCreationFlags combines several flags, including the following
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CREATE_SUSPENDED indicates that the primary thread is in a suspended state and will run only when ResumeThread is called DETACHED_PROCESS and CREATE_NEW_CONSOLE are mutually exclusive; don't set both The first flag creates a process without a console, and the second flag gives the new process a console of its own If neither flag is set, the process inherits the parent's console CREATE_NEW_PROCESS_GROUP specifies that the new process is the root of a new process group All processes in a group receive a console control signal (Ctrl-c or Ctrl-break) if they all share the same console Console control handlers were described in 4 and illustrated in Program 4-5 These process groups have similarities to UNIX process groups and are described later in this chapter
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Several of the flags control the priority of the new process's threads The possible values are explained in more detail at the end of 7 For now, just use the parent's priority (specify nothing) or NORMAL_PRIORITY_CLASS lpEnvironment points to an environment block for the new process If NULL, the process uses the parent's environment The environment block contains name and value strings, such as the search path lpCurDir specifies the drive and directory for the new process If NULL, the parent's working directory is used lpStartupInfo specifies the main window appearance and standard device handles for the new process Use the parent's information, which is obtained from GetStartupInfo Alternatively, zero out the associated STARTUPINFO structure before calling CreateProcess To specify the standard input, output, and error handles, set the standard handler fields (hStdInput, hStdOutput, and hStdError) in the STARTUPINFO structure For this to be effective, also set another STARTUPINFO member, dwFlags, to STARTF_USESTDHANDLES, and set all the handles that the child process will require Be certain that the handles are inheritable and that the CreateProcess bInheritHandles flag is set The Inheritable Handles subsection gives more information and an example lpProcInfo specifies the structure for containing the returned process, thread handles, and identification The PROCESS_INFORMATION structure is as follows: typedef struct PROCESS_INFORMATION { HANDLE hProcess; HANDLE hThread; DWORD dwProcessId; DWORD dwThreadId; } PROCESS_INFORMATION;
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Why do processes and threads need handles in addition to IDs The ID is unique to the object for its entire lifetime and in all processes, whereas a given process may have several handles, each having distinct attributes, such as security access For this reason, some process management functions require IDs, and others require handles Furthermore, process handles are required for the general-purpose, handle-based functions Examples include the wait functions discussed later in this chapter, which allow waiting on handles for several different object types, including processes Just as with file handles, process and thread handles should be closed when no longer required
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Note: The new process obtains environment, working directory, and other information from the CreateProcess call Once this call is complete, any changes in the parent will not be reflected in the child process For example, the parent might change its working directory after the CreateProcess call, but the child process working directory will not be affected, unless the child changes its own working directory The two processes are entirely independent The UNIX and Windows process models are considerably different First, Windows has no equivalent to the UNIX fork function, which makes a copy of the parent, including the parent's data space, heap, and stack fork is difficult to emulate exactly in Windows, and, while this may seem to be a limitation, fork is also difficult to use in a multithreaded UNIX system because there are numerous problems with creating an exact replica of a multithreaded system with exact copies of all threads and synchronization objects, especially on an SMP system Therefore, fork, by itself, is not really appropriate in any multithreaded system CreateProcess is, however, similar to the common UNIX sequence of successive calls to fork and execl (or one of five other exec functions) In contrast to Windows, the search directories in UNIX are determined entirely by the PATH environment variable As previously mentioned, Windows does not maintain parent-child relationships among processes Thus, a child process will continue to run after the creating parent process terminates Furthermore, there are no process groups in Windows There is, however, a limited form of process group that specifies all the processes to receive a console control event Windows processes are identified both by handles and by process IDs, whereas UNIX has no process handles
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