怎么样取进程占用CPU的百分比哇,就是跟WINDOWS任务管理器“CPU”一栏一样,不太清楚是那个API,我只能到进程时间和信息。
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或者你自己在網上搜搜.
对了,在还有没登陆WINDOWS系统的时候,自动运行我的程序,就跟pcanywhere一样,没有登陆系统就自动运行?????
http://www.swissdelphicenter.ch/torry/showcode.php?id=969 How to get the CPU usage in percentconst SystemBasicInformation = 0; SystemPerformanceInformation = 2; SystemTimeInformation = 3;
type TPDWord = ^DWORD;
TSystem_Basic_Information = packed record dwUnknown1: DWORD; uKeMaximumIncrement: ULONG; uPageSize: ULONG; uMmNumberOfPhysicalPages: ULONG; uMmLowestPhysicalPage: ULONG; uMmHighestPhysicalPage: ULONG; uAllocationGranularity: ULONG; pLowestUserAddress: Pointer; pMmHighestUserAddress: Pointer; uKeActiveProcessors: ULONG; bKeNumberProcessors: byte; bUnknown2: byte; wUnknown3: word; end;
type TSystem_Performance_Information = packed record liIdleTime: LARGE_INTEGER; {LARGE_INTEGER} dwSpare: array[0..75] of DWORD; end;
type TSystem_Time_Information = packed record liKeBootTime: LARGE_INTEGER; liKeSystemTime: LARGE_INTEGER; liExpTimeZoneBias: LARGE_INTEGER; uCurrentTimeZoneId: ULONG; dwReserved: DWORD; end;
var NtQuerySystemInformation: function(infoClass: DWORD; buffer: Pointer; bufSize: DWORD; returnSize: TPDword): DWORD; stdcall = nil; liOldIdleTime: LARGE_INTEGER = (); liOldSystemTime: LARGE_INTEGER = ();
function Li2Double(x: LARGE_INTEGER): Double;begin Result := x.HighPart * 4.294967296E9 + x.LowPartend;
procedure GetCPUUsage;var SysBaseInfo: TSystem_Basic_Information; SysPerfInfo: TSystem_Performance_Information; SysTimeInfo: TSystem_Time_Information; status: Longint; {long} dbSystemTime: Double; dbIdleTime: Double;
bLoopAborted : boolean;
begin if @NtQuerySystemInformation = nil then NtQuerySystemInformation := GetProcAddress(GetModuleHandle('ntdll.dll'), 'NtQuerySystemInformation');
// get number of processors in the system
status := NtQuerySystemInformation(SystemBasicInformation, @SysBaseInfo, SizeOf(SysBaseInfo), nil); if status <> 0 then Exit;
// Show some information with SysBaseInfo do begin ShowMessage( Format('uKeMaximumIncrement: %d'#13'uPageSize: %d'#13+ 'uMmNumberOfPhysicalPages: %d'+#13+'uMmLowestPhysicalPage: %d'+#13+ 'uMmHighestPhysicalPage: %d'+#13+'uAllocationGranularity: %d'#13+ 'uKeActiveProcessors: %d'#13'bKeNumberProcessors: %d', [uKeMaximumIncrement, uPageSize, uMmNumberOfPhysicalPages, uMmLowestPhysicalPage, uMmHighestPhysicalPage, uAllocationGranularity, uKeActiveProcessors, bKeNumberProcessors])); end; bLoopAborted := False;
while not bLoopAborted do begin
// get new system time status := NtQuerySystemInformation(SystemTimeInformation, @SysTimeInfo, SizeOf(SysTimeInfo), 0); if status <> 0 then Exit;
// get new CPU's idle time status := NtQuerySystemInformation(SystemPerformanceInformation, @SysPerfInfo, SizeOf(SysPerfInfo), nil); if status <> 0 then Exit;
// if it's a first call - skip it if (liOldIdleTime.QuadPart <> 0) then begin
// CurrentValue = NewValue - OldValue dbIdleTime := Li2Double(SysPerfInfo.liIdleTime) - Li2Double(liOldIdleTime); dbSystemTime := Li2Double(SysTimeInfo.liKeSystemTime) - Li2Double(liOldSystemTime);
// CurrentCpuIdle = IdleTime / SystemTime dbIdleTime := dbIdleTime / dbSystemTime;
// CurrentCpuUsage% = 100 - (CurrentCpuIdle * 100) / NumberOfProcessors dbIdleTime := 100.0 - dbIdleTime * 100.0 / SysBaseInfo.bKeNumberProcessors + 0.5;
// Show Percentage Form1.Label1.Caption := FormatFloat('CPU Usage: 0.0 %',dbIdleTime);
Application.ProcessMessages;
// Abort if user pressed ESC or Application is terminated bLoopAborted := (GetKeyState(VK_ESCAPE) and 128 = 128) or Application.Terminated;
end;
// store new CPU's idle and system time liOldIdleTime := SysPerfInfo.liIdleTime; liOldSystemTime := SysTimeInfo.liKeSystemTime;
// wait one second Sleep(1000); end;end;procedure TForm1.Button1Click(Sender: TObject);begin GetCPUUsageend;
对了,在还有没登陆WINDOWS系统的时候,自动运行我的程序,就跟pcanywhere一样,没有登陆系统就自动运行?????你要達到這種效果的呀, 可能要寫成windows的"服務"形式啦.
没登陆WINDOWS系统,"服務"形式,有写过吗,能否具体点,忘指点
http://www.vbzx.net/ArticleView/vbzx_Article_View_136.asp