Solved

Executing DOS commands

Posted on 2002-03-21
4
601 Views
Last Modified: 2010-04-05
Hi!

How can I execute a DOS command in Delphi, and get the results from it put into a memo?

ie. I want to execute a DIR command with some switches, and have the output from the DIR put into a memo.  Also, I will need to use the rename command, although if I can get the file name from the DIR, then I can do this programmatically in Delphi!

I'm using Delphi 6 Enterprise...  Thanks for your help...

mdavis1982
0
Comment
Question by:mdavis1982
4 Comments
 
LVL 40

Expert Comment

by:RQuadling
ID: 6885530
There are several ways.

1 - You could try using ShellExecute to run the command CMD.EXE or COMAMND.COM with the paramater of "/cDIR directory > LOG.TXT"

2 - You could create a batch file containing all the code you want WITH the redirection to a text file already done and then ShellExecute that batch file.

Once you've got the output file, you can load it into your memo.

3 - You could use something like the code that is available at ...

http://www.delphifreestuff.com/examples/redir.html

This code still stores the output into a file, but you could probably modify it to feed your memo instead.

I don't know if this code is D6 compatible, but it is a start point maybe.

Regards,

Richard Quadling.
0
 
LVL 2

Expert Comment

by:craig_capel
ID: 6887569
When someone has given you all the information you need to complete your task, look at thier comment box and in the top right you will see "accept comment as answer" click on it when you feel they have answered your question. the other time is when the user selects thier comment as answer, however this does not happen often because it's polite to let the user decide if it helped them or not.

-

Craig C.
0
 

Accepted Solution

by:
Rabster earned 50 total points
ID: 6888233
You could use this code:

procedure RunDosInMemo(DosApp:String;AMemo:TMemo);
const
  ReadBuffer = 2400;
var
  Security            : TSecurityAttributes;
  ReadPipe,WritePipe  : THandle;
  start               : TStartUpInfo;
  ProcessInfo         : TProcessInformation;
  Buffer              : Pchar;
  BytesRead           : DWord;
  Apprunning          : DWord;
begin
  With Security do
  begin
   nlength              := SizeOf(TSecurityAttributes);
   binherithandle       := true;
   lpsecuritydescriptor := nil;
  end;
  if Createpipe (ReadPipe, WritePipe,@Security, 0) then
  begin
    Buffer  := AllocMem(ReadBuffer + 1);
    FillChar(Start,Sizeof(Start),#0);
    start.cb          := SizeOf(start);
    start.hStdOutput  := WritePipe;
    start.hStdInput   := ReadPipe;
    start.dwFlags     := STARTF_USESTDHANDLES +
                        STARTF_USESHOWWINDOW;
    start.wShowWindow := SW_Hide;
    if CreateProcess(nil,PChar(DosApp),@Security,
    @Security,true,NORMAL_PRIORITY_CLASS,nil,nil,
    start,ProcessInfo) then
    begin
      repeat
        Apprunning := WaitForSingleObject
        (ProcessInfo.hProcess,100);
        If StopIt = True then
        begin
          ShowMessage('Program Stopped');
          Break;
          ShowMessage('Program Stopped');
        end;
       Application.ProcessMessages;
      until (Apprunning <> WAIT_TIMEOUT);
      repeat
        BytesRead := 0;
        ReadFile(ReadPipe,Buffer[0],
        ReadBuffer,BytesRead,nil);
        Buffer[BytesRead]:= #0;
        OemToAnsi(Buffer,Buffer);
        AMemo.Text := AMemo.text + String(Buffer);
      until (BytesRead < ReadBuffer);
    end;
  end
  else
  ShowMessage('Could not run this applciation');
  FreeMem(Buffer);
  CloseHandle(ProcessInfo.hProcess);
  CloseHandle(ProcessInfo.hThread);
  CloseHandle(ReadPipe);
  CloseHandle(WritePipe);
end;

0
 

Author Comment

by:mdavis1982
ID: 6888666
Thanks! That's great!  Oh, and here's 20 extra points for answering my question! #:o)

Matt
0

Featured Post

Is Your Active Directory as Secure as You Think?

More than 75% of all records are compromised because of the loss or theft of a privileged credential. Experts have been exploring Active Directory infrastructure to identify key threats and establish best practices for keeping data safe. Attend this month’s webinar to learn more.

Question has a verified solution.

If you are experiencing a similar issue, please ask a related question

Creating an auto free TStringList The TStringList is a basic and frequently used object in Delphi. On many occasions, you may want to create a temporary list, process some items in the list and be done with the list. In such cases, you have to…
Introduction Raise your hands if you were as upset with FireMonkey as I was when I discovered that there was no TListview.  I use TListView in almost all of my applications I've written, and I was not going to compromise by resorting to TStringGrid…
This tutorial gives a high-level tour of the interface of Marketo (a marketing automation tool to help businesses track and engage prospective customers and drive them to purchase). You will see the main areas including Marketing Activities, Design …
This Micro Tutorial demonstrates using Microsoft Excel pivot tables, how to reverse engineer competitors' marketing strategies through backlinks.

895 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question

Need Help in Real-Time?

Connect with top rated Experts

15 Experts available now in Live!

Get 1:1 Help Now