public static extern bool Process32Next(IntPtr Handle, ref ProcessEntry32 ProcessInfo);
private void GetUsage()
{
ProcessEntry32 ProcessInfo = new ProcessEntry32();
ProcessTimes ProcessTimes = new ProcessTimes();
IntPtr ProcessList, ProcessHandle = ProcessCPU.PROCESS_HANDLE_ERROR;
ProcessData CurrentProcessData;
int Index;
float Total = 0;
bool NoError;
// this creates a pointer to the current process list
ProcessList = ProcessCPU.CreateToolhelp32Snapshot(ProcessCPU.TH32CS_SNAPPROCESS, 0);
if (ProcessList == ProcessCPU.PROCESS_LIST_ERROR) { return; }
// we use Process32First, Process32Next to loop through the processes
ProcessInfo.Size = ProcessCPU.PROCESS_ENTRY_32_SIZE;
NoError = ProcessCPU.Process32First(ProcessList, ref ProcessInfo);
IDList.Clear();
while (NoError)
try
{
// we need a process handle to pass it to GetProcessTimes function
// the OpenProcess function will provide us the handle by the id
ProcessHandle = ProcessCPU.OpenProcess(ProcessCPU.PROCESS_ALL_ACCESS, false, ProcessInfo.ID);
// here's what we are looking for, this gets the kernel and user time
ProcessCPU.GetProcessTimes(
ProcessHandle,
out ProcessTimes.RawCreationTime,
out ProcessTimes.RawExitTime,
out ProcessTimes.RawKernelTime,
out ProcessTimes.RawUserTime);
// convert the values to DateTime values
ProcessTimes.ConvertTime();
long dtNowTicks = DateTime.Now.Ticks;
//from here is just managing the gui for the process list
CurrentProcessData = ProcessExists(ProcessInfo.ID);
IDList.Add(ProcessInfo.ID);
if (CurrentProcessData == PROCESS_DATA_NOT_FOUND)
{
Index = ProcessDataList.Add(new ProcessData(
ProcessInfo.ID,
ProcessInfo.ExeFilename,
ProcessTimes.UserTime.Ticks,
ProcessTimes.KernelTime.Ticks));
}
else
Total += CurrentProcessData.UpdateCpuUsage(
ProcessTimes.UserTime.Ticks,
ProcessTimes.KernelTime.Ticks,
dtNowTicks);
}
finally
{
if (ProcessHandle != ProcessCPU.PROCESS_HANDLE_ERROR)
ProcessCPU.CloseHandle(ProcessHandle);
NoError = ProcessCPU.Process32Next(ProcessList, ref ProcessInfo);
}
ProcessCPU.CloseHandle(ProcessList);
Index = 0;
while (Index < ProcessDataList.Count)
{
ProcessData TempProcess = (ProcessData)ProcessDataList[Index];
if (IDList.Contains(TempProcess.ID))
Index++;
else
{
ProcessDataList.RemoveAt(Index);
}
}
}