通過Delphi與命令提示通信

Question

我試圖用delphi發送命令到命令提示符。 但是，我無法這樣做，因爲我使用CreateProcess方法來做到這一點。 我試圖改變StdOutPipeWrite，但是，CreateProcess似乎不允許來自CreateProcess的初始命令通過後的命令。 有什麼辦法可以利用這個句柄繼續發送和接收來自命令提示符和delphi的命令和消息嗎？

Answer 1

我的同伴Glenn9999來自tek-tips.com wrote a nice FAQ on this subject。 我不知道他是不是這樣，但他值得所有這一個功勞。 我將這個頁面的代碼拷貝到這裏供將來參考。他使用管道進行控制檯和delphi之間的通信。

unit mcunit; 

{ written by Glenn9999 @ tek-tips.com. Posted here 6/21/2011 } 
interface 

uses 
    Windows, Messages, SysUtils, Classes, Graphics, Controls, Forms, Dialogs, 
    StdCtrls; 

type 
    monitor = class(TThread) // pipe monitoring thread for console output 
    private 
    TextString: String; 
    procedure UpdateCaption; 
    protected 
    procedure Execute; override; 
    end; 
    TForm1 = class(TForm) 
    CommandText: TMemo; 
    CommandRun: TComboBox; 
    Button2: TButton; 
    SaveDialog1: TSaveDialog; 
    procedure FormDestroy(Sender: TObject); 
    procedure Button2Click(Sender: TObject); 
    procedure FormCreate(Sender: TObject); 
    private 
    { Private declarations } 
    public 
    { Public declarations } 
    cmdcount: integer; 
    end; 

var 
    Form1: TForm1; 
    InputPipeRead, InputPipeWrite: THandle; 
    OutputPipeRead, OutputPipeWrite: THandle; 
    ErrorPipeRead, ErrorPipeWrite: THandle; 
    ProcessInfo : TProcessInformation; 
    myThread: monitor; 

implementation 

{$R *.DFM} 

procedure WritePipeOut(OutputPipe: THandle; InString: string); 
// writes Instring to the pipe handle described by OutputPipe 
    var 
    byteswritten: DWord; 
    begin 
// most console programs require CR/LF after their input. 
    InString := InString + #13#10; 
    WriteFile(OutputPipe, Instring[1], Length(Instring), byteswritten, nil); 
    end; 

function ReadPipeInput(InputPipe: THandle; var BytesRem: Integer): String; 
    { 
    reads console output from InputPipe. Returns the input in function 
    result. Returns bytes of remaining information to BytesRem 
    } 
    var 
    TextBuffer: array[1..32767] of char; 
    TextString: String; 
    BytesRead: Integer; 
    PipeSize: Integer; 
    begin 
    Result := ''; 
    PipeSize := Sizeof(TextBuffer); 
    // check if there is something to read in pipe 
    PeekNamedPipe(InputPipe, nil, PipeSize, @BytesRead, @PipeSize, @BytesRem); 
    if bytesread > 0 then 
     begin 
     ReadFile(InputPipe, TextBuffer, pipesize, bytesread, nil); 
     // a requirement for Windows OS system components 
     OemToChar(@TextBuffer, @TextBuffer); 
     TextString := String(TextBuffer); 
     SetLength(TextString, BytesRead); 
     Result := TextString; 
     end; 
    end; 

procedure monitor.Execute; 
{ monitor thread execution for console output. This must be threaded. 
    checks the error and output pipes for information every 40 ms, pulls the 
    data in and updates the memo on the form with the output } 
var 
    BytesRem: DWord; 
begin 
    while not Terminated do 
    begin 
     // read regular output stream and put on screen. 
     TextString := ReadPipeInput(OutputPipeRead, BytesRem); 
     if TextString <> '' then 
     Synchronize(UpdateCaption); 
     // now read error stream and put that on screen. 
     TextString := ReadPipeInput(ErrorPipeRead, BytesRem); 
     if TextString <> '' then 
     Synchronize(UpdateCaption); 
     sleep(40); 
    end; 
end; 

procedure monitor.UpdateCaption; 
// synchronize procedure for monitor thread - updates memo on form. 
begin 
    With Form1.CommandText.Lines do 
    Add(TextString); 
end; 

procedure TForm1.FormDestroy(Sender: TObject); 
begin 
    WritePipeOut(InputPipeWrite, 'EXIT'); // quit the CMD we started 
    MyThread.Terminate; 
    // close process handles 
    CloseHandle(ProcessInfo.hProcess); 
    CloseHandle(ProcessInfo.hThread); 
    // close pipe handles 
    CloseHandle(InputPipeRead); 
    CloseHandle(InputPipeWrite); 
    CloseHandle(OutputPipeRead); 
    CloseHandle(OutputPipeWrite); 
    CloseHandle(ErrorPipeRead); 
    CloseHandle(ErrorPipeWrite); 
end; 

procedure TForm1.Button2Click(Sender: TObject); 
{ takes the input from the command edit box and processes it } 
    var 
    UpText: String; 
    begin 
    UpText := UpperCase(CommandRun.Text); // done to eliminate case-sensitivity 
    if UpText = 'CLR' then  // clear the memo 
     begin 
     CommandText.Clear; 
     WritePipeOut(InputPipeWrite, #13); 
     end 
    else 
    if UpText = 'SAVELOG' then // save the memo box to a file. 
     begin 
     if SaveDialog1.Execute then 
      begin 
      CommandText.Lines.SaveToFile(SaveDialog1.FileName); 
      CommandText.Lines.Add('Log file saved.'); 
      end 
     else 
      CommandText.Lines.Add('Log file not saved.'); 
     end 
    // expand this, it needs to catch any variation where the command-interpreter 
    // is called. Any different ideas? 
    else 
    if UpText = 'CMD' then 
     inc(cmdcount) 
    else 
    if UpText = 'COMMAND' then 
     inc(cmdcount) 
    // terminate app if user types exit, else let alone 
    else 
    if UpText = 'EXIT' then 
     begin 
     if cmdcount = 1 then 
      Application.Terminate 
     else 
      dec(cmdcount); 
     end 
    else 
     WritePipeOut(InputPipeWrite, CommandRun.Text); 
    CommandRun.Items.Add(CommandRun.Text); 
    CommandRun.Text := ''; 
    CommandRun.SetFocus; 
    end; 

procedure TForm1.FormCreate(Sender: TObject); 
{ upon form creation, this calls the command-interpreter, sets up the three 
    pipes to catch input and output, and starts a thread to monitor and show 
    the output of the command-interpreter } 
    var 
    DosApp: String; 
    DosSize: Integer; 
    Security : TSecurityAttributes; 
    start : TStartUpInfo; 
    begin 
    CommandText.Clear; 
    // get COMSPEC variable, this is the path of the command-interpreter 
    SetLength(Dosapp, 255); 
    DosSize := GetEnvironmentVariable('COMSPEC', @DosApp[1], 255); 
    SetLength(Dosapp, DosSize); 

    // create pipes 
    With Security do 
     begin 
     nlength := SizeOf(TSecurityAttributes) ; 
     binherithandle := true; 
     lpsecuritydescriptor := nil; 
     end; 
    CreatePipe(InputPipeRead, InputPipeWrite, @Security, 0); 
    CreatePipe(OutputPipeRead, OutputPipeWrite, @Security, 0); 
    CreatePipe(ErrorPipeRead, ErrorPipeWrite, @Security, 0); 

    // start command-interpreter 
    FillChar(Start,Sizeof(Start),#0) ; 
    start.cb := SizeOf(start) ; 
    start.hStdInput := InputPipeRead; 
    start.hStdOutput := OutputPipeWrite; 
    start.hStdError := ErrorPipeWrite; 
    start.dwFlags := STARTF_USESTDHANDLES + STARTF_USESHOWWINDOW; 
    start.wShowWindow := SW_HIDE; 
    if CreateProcess(nil, PChar(DosApp), @Security, @Security, true, 
       CREATE_NEW_CONSOLE or SYNCHRONIZE, 
       nil, nil, start, ProcessInfo) then 
     begin 
     MyThread := monitor.Create(false); // start monitor thread 
     MyThread.Priority := tpHigher; 
     end; 
    Button2.Enabled := true; 
    cmdcount := 1; 
end; 

end. 

Answer 2

首先聲明的用途：

ShellAPI 

然後用這個：

ShellExecute(0, nil, 'cmd.exe', '/c **YOUR_COMMAND_HERE**', nil, HIDE_WINDOW);