Obtain the CPU usage of a process

Obtain the CPU usage of a process

 

// Time conversion static _ int64 file_time_2_utc (const filetime * ftime) {large_integer Li; Li. lowpart = ftime-> dwlowdatetime; Li. highpart = ftime-> dwhighdatetime; return Li. quadpart;} // obtain the number of CPU cores. Static int get_processor_number () {system_info Info; getsysteminfo (& info); Return (INT) info. dwnumberofprocessors;} // obtain the process CPU usage int get_cpu_usage (int pid) {// Number of CPUs static int processor_count _ =-1; // last time static _ int6 4 last_time _ = 0; static _ int64 last_system_time _ = 0; filetime now; filetime creation_time; filetime exit_time; filetime kernel_time; filetime user_time; _ int64 system_time; _ int64 time; _ int64 system_time_delta; _ int64 time_delta; int CPU =-1; if (processor_count _ =-1) {processor_count _ = get_processor_number ();} getsystemtimeasfiletime (& now ); handle hprocess = OpenProcess (process_all_a Ccess, false, pid); If (! Getprocesstimes (hprocess, & creation_time, & exit_time, & kernel_time, & user_time) {return-1;} system_time = (bytes (& kernel_time) + file_time_2_utc (& user_time )) /processor_count _; time = file_time_2_utc (& now); If (last_system_time _ = 0) | (last_time _ = 0) {last_system_time _ = system_time; last_time _ = time; Return-1;} system_time_delta = system_time-last_system_time _; time_delta = Time-last_time _; If (time_delta = 0) Return-1; CPU = (INT) (system_time_delta * 100 + time_delta/2)/time_delta); last_system_time _ = system_time; last_time _ = time; return CPU ;}

 

Obtain the CPU usage of a process