Capture all commands output - winapi

Question

I want to capture cmd.exe output and show it in a diffrent gui I am making. I want to make a command interpreter with extended functionality. The dir command works flawless, the problem ocurrs when I try to execute another process like ipconfig.
I don't see ipconfig output. Is there a workarround on that ?!
I use TProcess component from Lazarus (FreePascal)
proc := TProcess.Create(nil);
proc.Options:= [poUsePipes, poNoConsole];
proc.ShowWindow:= swoHIDE;
proc.Executable:= 'cmd';
Reading output thread:
if (Length(cmd) > 0) then
begin
cmd := cmd + #13#10;
proc.Input.Write(cmd[1], Length(cmd)); // here I write command from user
strikes := 0;
end
else
if proc.Output.NumBytesAvailable > 0 then
begin
while proc.Output.NumBytesAvailable > 0 do
begin
FillChar(buf, sizeof(buf), #0);
proc.Output.Read(buf, sizeof(buf) - 1);
data := data + buf;
end;
// data gets echoed to user

Answer 1

It works fine for me (I use FPC 3.1.1 & Lazarus 1.5 but I hope it does not matter):
proc.Options:= [poUsePipes];
proc.ShowWindow:= swoHIDE;
proc.Executable:= 'cmd';
...
procedure TForm1.Edit1KeyPress(Sender: TObject; var Key: Char);
var
cmd: String;
begin
if Key = #13 then
begin
Key := #0;
if not proc.Active then
proc.Active := True;
cmd := Edit1.Text + LineEnding;
proc.Input.Write(cmd[1], Length(cmd));
end;
end;
procedure TForm1.Timer1Timer(Sender: TObject);
var
buf: array[0..65535] of Char;
begin
if proc.Output.NumBytesAvailable > 0 then
begin
while proc.Output.NumBytesAvailable > 0 do
begin
FillChar(buf, sizeof(buf), #0);
proc.Output.Read(buf, sizeof(buf) - 1);
Memo1.Lines.Add(buf);
end;
end;
end;
I guess that you just does not catch process output properly.
Good luck.
PS: If you need to create some windows console-like application, the best way, I think, is using Windows console API instead of cross-platform Lazarus components.
PPS: To emulate console look and behavior with Lazarus use CmdLine component.

Answer 2

In general it is smart to first check if the short examples don't solve the problem:
e.g.
uses process;
var s : ansistring;
begin
runcommand('ipconfig',['/all'],s);
writeln(s);
end.
works fine, and saves a whole lot of trouble. (FPC 2.6.2+ though)