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Program to change the priority of the process in LabVIEW

2022-07-27 03:47:00 【LabVIEW development】

LabVIEW Program to change the priority of the process

stay labVIEW Can be called kernel32 Dynamic link library to change the priority of the process . You need two functions ：GetCurrentProcess() and SetPriorityClass().

Yes 6 There are priorities to choose from , this 6 The priority and its identification code are listed below ：

Free (IDLE): IDLE_PRIORITY_CLASS

Second low (BELOWNORMAL): BELOW_NORMAL_PRIORITY_CLASS

Ordinary (NORMAL): NORMAL_PRIORITY_CLASS

Secondary high (ABOVENORMAL): ABOVE_NORMAL_PRIORITY_CLASS

senior (HIGHPRIORITY): HIGH_PRIORITY_CLASS

real time (REALTIME): REALTIME_PRIORITY_CLASS

stay LabVIEW in , First, create a call library function node , And point to kernel32.dll( Generally located c:\windows\system32). The appearance of the function prototype after the call is ：

unsigned longGetCurrentProcess(void)

Because this is called Windows Of API function , Call mode changed to stdcall(WINAPI). The second one calls the library function VI Similar to the first , Besides using SetPriorityClass function . After establishing the second call library function node, the function prototype looks like ：

unsigned longSetPriorityClass(unsigned long handle, unsigned long priority)

alike , Call mode changed to stdcall(WINAPI). GetPriorityClass The return value of the function and SetPriorityClass Function handle related , The corresponding priority type is hexadecimal (hex). stay winbase.h In file ( Included in Microsoft Of WIN32 SDK in ), You can find declarations that define priorities . They are ：

#defineIDLE_PRIORITY_CLASS 0x00000040

#defineBELOW_NORMAL_PRIORITY_CLASS 0x00004000

#define NORMAL_PRIORITY_CLASS0x00000020

#defineABOVE_NORMAL_PRIORITY_CLASS 0x00008000

#defineHIGH_PRIORITY_CLASS 0x00000080

#defineREALTIME_PRIORITY_CLASS 0x00000100

Use these values , You can specify the priority of threads . for instance , If you want to set the priority of the process to idle (IDLE), As long as a hexadecimal value of 40 Constant of .

open 、 Run the example in the attachment . When running the example , open Windows Task manager , Changing LabVIEW The priority of the program can be observed LabVIEW Priority status .