Delphi编程获取系统当前进程、窗口句柄、文件属性以及程序运行状态.

uses TLHelp32,PsAPI;

(1)显示进程列表：
procedure TForm1.Button2Click(Sender: TObject);
var lppe: TProcessEntry32;
found : boolean;
Hand : THandle;
P:DWORD;
s:string;
begin
ListBox1.Items.Clear ;
Hand := CreateToolhelp32Snapshot(TH32CS_SNAPALL,0);
found := Process32First(Hand,lppe);
while found do
begin
s := StrPas(lppe.szExeFile);
if lppe.th32ProcessID>0 then
    p := lppe.th32ProcessID
else
    p := 0;
ListBox1.Items.AddObject(s,pointer(p));//列出所有进程。
found := Process32Next(Hand,lppe);
end;
end;

(2)杀死某进程：
procedure TForm1.Button3Click(Sender: TObject);
var lppe: TProcessEntry32;
found : boolean;
Hand : THandle;
P:DWORD;
sExeFile,sSelect:string;
killed:boolean;
begin
p :=DWORD(ListBox1.Items.Objects[ListBox1.itemindex]);
if P<>0 then
begin
killed := TerminateProcess(OpenProcess(PROCESS_TERMINATE,False,P),$FFFFFFFF);
if not killed then
    messagebox(self.handle,pchar(sExeFile+'无法杀死！'),'提示',MB_OK or MB_ICONWARNING)
else
    ListBox1.Items.Delete(ListBox1.ItemIndex);
end;
end;

(3)取得某进程EXE路径：
procedure TForm1.Button8Click(Sender: TObject); //uses PSAPI;
var
h:THandle; fileName:string; iLen:integer; hMod:HMODULE;cbNeeded,p:DWORD;
begin
p :=DWORD(ListBox1.Items.Objects[ListBox1.itemindex]);
h := OpenProcess(PROCESS_ALL_ACCESS, false, p);     //p 为 进程ID
if h > 0 then
begin
if EnumProcessModules( h, @hMod, sizeof(hMod), cbNeeded) then
begin
    SetLength(fileName, MAX_PATH);
    iLen := GetModuleFileNameEx(h, hMod, PCHAR(fileName), MAX_PATH);
    if iLen <> 0 then
    begin
      SetLength(fileName, StrLen(PCHAR(fileName)));
      ShowMessage(fileName);
    end;
end;
CloseHandle(h);
end;
end;

(4)取得窗口列表：
begin
ListBox1.Items.Clear ;
EnumWindows(@EnumWindowsProc, 0);
end;

(5)杀死窗口进程：
procedure TForm1.Button6Click(Sender: TObject);
var
H:THandle;
P:DWORD;
s:string;
killed:boolean;
begin
s := ListBox1.Items[ListBox1.ItemIndex];
H:=FindWindow(nil,pchar(s));
if H<>0 then
begin
GetWindowThreadProcessId(H,@P);
if P<>0 then
    killed:=TerminateProcess(OpenProcess(PROCESS_TERMINATE,False,P),$FFFFFFFF);
if not killed then
    messagebox(self.handle,pchar(s+'无法杀死！'),'提示',MB_OK or MB_ICONWARNING)
else
    ListBox1.Items.Delete(ListBox1.ItemIndex);
end;
end;

(6)取得窗口进程路径：
procedure TForm1.Button9Click(Sender: TObject);
var
H:THandle; P,cbNeeded: DWORD; s,fileName:string;
iLen:integer;   hMod:HMODULE;
begin
s := ListBox1.Items[ListBox1.ItemIndex];
H:=FindWindow(nil,pchar(s));

if H<>0 then
begin
GetWindowThreadProcessId(H,@P);
if P<>0 then
begin
    h := OpenProcess(PROCESS_ALL_ACCESS, false, p);     //p 为 进程ID
    if h > 0 then
    begin
      if EnumProcessModules( h, @hMod, sizeof(hMod), cbNeeded) then
      begin
      SetLength(fileName, MAX_PATH);
      iLen := GetModuleFileNameEx(h, hMod, PCHAR(fileName), MAX_PATH);
      if iLen <> 0 then
      begin
            SetLength(fileName, StrLen(PCHAR(fileName)));
            ShowMessage(fileName);
      end;
      end;
      CloseHandle(h);
    end;
end;
end;
end;

(7)文件属性：
procedure TForm1.Button1Click(Sender: TObject);
var
SR: TSearchRec;
V1, V2, V3, V4: integer ;
const
dtFmt:string = 'YYYY-MM-DD HH:NN:SS';
begin
// ============== 方法一 ==================== //
if FindFirst(sFileName, faAnyFile, SR) = 0 then
begin
Edit1.Text := intToStr(SR.Attr);   //文件属性
Edit2.Text := intToStr(SR.Size);   //文件大小
Edit3.Text := FormatDateTime(dtFmt,CovFileDate(SR.FindData.ftCreationTime));   //创建时间
Edit4.Text := FormatDateTime(dtFmt,CovFileDate(SR.FindData.ftLastWriteTime)); //最后修改时间
Edit5.Text := FormatDateTime(dtFmt,CovFileDate(SR.FindData.ftLastAccessTime)); //最后访问时间

if SR.Attr and faHidden <> 0 then
    FileSetAttr(sFileName, SR.Attr-faHidden);

FindClose(SR);
end;

if GetFileVersion(sFileName,V1, V2, V3, V4) then
Edit7.Text := intToStr(v1)+'.'+intToStr(v2)+'.'+intToStr(v3)+'.'+intToStr(v4);

// ============== 方法二 ==================== //
{
var
Attrs: Word;
f: file of Byte;   // 文件大小 必须要定义为" file of byte" ,这样才能取出 bytes
size: Longint;

//文件属性
Attrs := FileGetAttr(sFileName);

Edit1.Text := intToStr(Attrs);

//文件大小
AssignFile(f, OpenDialog1.FileName);
Reset(f);
try
AssignFile(f, sFileName);
Reset(f);
size := FileSize(f);
Edit2.Text := intToStr(size);
finally
CloseFile(f);
end;
}
end;

(8)判断程序是否在运行：
procedure TForm1.Button5Click(Sender: TObject);
var PrevInstHandle:Thandle;
AppTitle:pchar;
begin
AppTitle := pchar('test');
PrevInstHandle := FindWindow(nil, AppTitle);
if PrevInstHandle <> 0 then begin
    if IsIconic(PrevInstHandle) then
    ShowWindow(PrevInstHandle, SW_RESTORE)
    else
    BringWindowToTop(PrevInstHandle);
    SetForegroundWindow(PrevInstHandle);
end;
end;

参考：http://www.cnblogs.com/key-ok/p/4594676.html