Creation and destruction of MFC processes, creation and interaction of threads

Creation of processes

Startupinfo si;//* * Member DWORD DwFlags; Indicates which members of the struct are valid. **startf_useshowwindow| Startf_usepositionprocess_information Pi; ZeroMemory (&si,sizeof(SI)); SI.CB=sizeof(SI); ZeroMemory (&PI,sizeof(PI)); //LPTSTR pszcmdline = TEXT ("C:\\windows\\system32\\notedap.exe");//TCHAR pszcmdline[] = TEXT ("C:\\windows\\system32\\notedap.exe"); //Windows core Programming specifically has this problem CreateProcess will modify the command line string passed to it, LPTSTR is the string pointer cannot be modified .... *//char* szcommandline = "C:\\Program Files (x86) \\KuGou\\KGMusic\\KuGou.exe";TCHAR szcommandline[] = TEXT ("Notepad ReadMe.txt");//ReadMe.txt in the current directory of the parent process:: CreateProcess (NULL,//executable file name (the. exe must be added.) If the path is not added, only the current directory will be searched. So is generally null)(LPWSTR) Szcommandline,//parameters passed to the execution module, equivalent to input szcommandline in the run bar (can be automatically searched for EXE in some directories)Null//Process SecurityNull//Thread SafetyFALSE,//whether an inheritable handle to the current process can be inherited by a new processNull//Create flags such as Creat_new_consoleNull//Environment VariablesNull//current directory&si,//the display information of the parent to the child process&PI);//flag information for this process id\ handle&pi.dwProcessId;//Process ID&pi.dwThreadId;//main thread ID in process&pi.hProcess;//Process Kernel handle&pi.hThread;//main thread kernel handle in process

Terminating a process

    //:: ExitProcess (0); //terminates the current process, exit code 0//BOOL bbet=::terminateprocess (pi.hprocess,-1);//Exit code-1 (Shutdown process failed)HANDLE hprocess=:: OpenProcess (Process_all_access,//Desired access RightsFALSE,//whether the returned handle can be inheritedPI.DWPROCESSID);//Process IDBOOL Bbet =:: TerminateProcess (hprocess,-1);//(shutdown process succeeded)CloseHandle (hprocess);  CloseHandle (pi.hprocess); //Close if not used

Creating Threads

DWORD dwThreadID;    HANDLE Hhandle; Hhandle=:: CreateThread (NULL,//Thread-Safe PropertiesNull//Thread Stack sizeThreadfun,//thread function Start addressNull//arguments passed to the thread function                             0,//whether to start the thread now&dwthreadid);//Get thread ID//generally use the following methodsUINT uId;    HANDLE hhandlecopy; Hhandlecopy= (HANDLE):: _beginthreadex (NULL,//Thread-Safe PropertiesNull//Thread Stack sizeThreadProc,//thread function Start addressNull//arguments passed to the thread function                               0,//whether to start the thread now&UID);//Get thread ID

The thread functions are as follows:

//============================================================================================//definition of a thread function//DWORD WINAPI threadfun ()//parameter LPVoid Ipparam is requiredDWORD WINAPI threadfun (lpvoid ipparam) {startupinfo si;    Process_information Pi; ZeroMemory (&si,sizeof(SI)); SI.CB=sizeof(SI); ZeroMemory (&PI,sizeof(PI)); TCHAR szcommandline[]= TEXT ("C:\\Program Files (x86) \\KuGou\\KGMusic\\KuGou.exe"); :: CreateProcess (NULL, (LPWSTR) szcommandline,null,null,false,null,null, NULL,&si,&pi); return 0;}//=============================================================================================UINT _stdcall ThreadProc (lpvoid ipparam) {:: WaitForSingleObject (G_hevent,infinite);    Startupinfo si;    Process_information Pi; ZeroMemory (&si,sizeof(SI)); SI.CB=sizeof(SI); ZeroMemory (&PI,sizeof(PI)); TCHAR szcommandline[]= TEXT ("Notepad ReadMe.txt"); :: CreateProcess (NULL, (LPWSTR) szcommandline, NULL, NULL, FALSE, NULL, NULL, NULL ,&si, &pi); return 0;}//================================================================================================

Thread Communication Interaction

    //Interaction between Threads (event kernel object)//HANDLE g_hevent;G_hevent =:: CreateEvent (NULL,//Event Object Security PropertiesFALSE,//whether to manually reset the event object to untrusted (otherwise the system resets automatically)FALSE,//Initial state (trusted/untrusted) in execution: untrustedNULL);//Event object Name (available for the third parameter of the OpenEvent () function, similar to a process):: WaitForSingleObject (Hhandle,//Object HandleINFINITE);//wait time (\ milliseconds)Sleep (10000);    SetEvent (g_hevent); //retevent (g_hevent);//no reset (automatic reset) in automatic mode:: WaitForSingleObject (Hhandlecopy,infinite);//wait//:: WaitForMultipleObjects (2,//number of object handles//H,//array of Object handles//TRUE,//whether to wait for all kernel objects to become trusted (otherwise there is one)//INFINITE)//wait time (\ milliseconds)//It is useful to wait for the specified thread to execute (without the thread having finished executing the main process is finished)

Among them SetEvent (g_hevent); The g_hevent in the handle is the global variable g_hevent;

SetEvent (g_hevent) causes the event object g_hevent to become a trusted state,

at this in the ThreadProc function :: WaitForSingleObject (g_hevent,infinite), the function detects that it is a trusted time to start executing the next code.

Terminating a thread is similar to terminating a process, generally does not use the Terminate process and thread functions, and generally uses a communication mechanism to tell the process or thread to close to let it exit itself.

A forced termination makes it too late to perform destructors, reclaim memory, and cause memory leaks.

Creation and destruction of MFC processes, creation and interaction of threads