windowsAPI OpenProcess和CreateProcess的区别

API了解的多了，很容易混乱，在调试一节中，提到打开进程和创建进程。
从名字上来说，创建进程，就是创建了一个新的进程，而打开进程，是为了获取已经运行了的进程的句柄。

MSDN解释，说的很清楚

OpenProcess

function: Opens an existing local process object.return: If the function succeeds, the return value is an open handle to the specified process.HANDLE WINAPI OpenProcess(  _In_ DWORD dwDesiredAccess,  _In_ BOOL  bInheritHandle,  _In_ DWORD dwProcessId);

CreateProcess

function: Creates a new process and its primary thread. The new process runs in the security context of the calling process.return: If the function succeeds, the return value is nonzero.BOOL WINAPI CreateProcess(  _In_opt_    LPCTSTR               lpApplicationName,  _Inout_opt_ LPTSTR                lpCommandLine,  _In_opt_    LPSECURITY_ATTRIBUTES lpProcessAttributes,  _In_opt_    LPSECURITY_ATTRIBUTES lpThreadAttributes,  _In_        BOOL                  bInheritHandles,  _In_        DWORD                 dwCreationFlags,  _In_opt_    LPVOID                lpEnvironment,  _In_opt_    LPCTSTR               lpCurrentDirectory,  _In_        LPSTARTUPINFO         lpStartupInfo,  _Out_       LPPROCESS_INFORMATION lpProcessInformation);

也就是说，打开进程，该进程有PID,是正在运行的程序 ，而创建进程是创建一个新的进程，此时该程序没有PID,创建完成之后就有了。