The below code captures console outputs and sent in realime to the Memo parameter, so the end user may not think the application is hanging while program performing the command.
type
TArg<T> = reference to procedure(const Arg: T);
.
.
.
procedure TMainFrm.CaptureConsoleOutput(const ACommand: String; CallBack: TArg<PAnsiChar>);
const
CReadBuffer = 2400;
var
saSecurity: TSecurityAttributes;
hRead: THandle;
hWrite: THandle;
suiStartup: TStartupInfo;
piProcess: TProcessInformation;
pBuffer: array [0 .. CReadBuffer] of AnsiChar;
dBuffer: array [0 .. CReadBuffer] of AnsiChar;
dRead: DWORD;
dRunning: DWORD;
dAvailable: DWORD;
begin
saSecurity.nLength := SizeOf(TSecurityAttributes);
saSecurity.bInheritHandle := true;
saSecurity.lpSecurityDescriptor := nil;
if CreatePipe(hRead, hWrite, @saSecurity, 0) then
try
FillChar(suiStartup, SizeOf(TStartupInfo), #0);
suiStartup.cb := SizeOf(TStartupInfo);
suiStartup.hStdInput := hRead;
suiStartup.hStdOutput := hWrite;
suiStartup.hStdError := hWrite;
suiStartup.dwFlags := STARTF_USESTDHANDLES or STARTF_USESHOWWINDOW;
suiStartup.wShowWindow := SW_HIDE;
if CreateProcess(nil, PChar(ACommand), @saSecurity, @saSecurity, true, NORMAL_PRIORITY_CLASS, nil, nil, suiStartup,
piProcess) then
try
repeat
dRunning := WaitForSingleObject(piProcess.hProcess, 100);
PeekNamedPipe(hRead, nil, 0, nil, @dAvailable, nil);
if (dAvailable > 0) then
repeat
dRead := 0;
ReadFile(hRead, pBuffer[0], CReadBuffer, dRead, nil);
pBuffer[dRead] := #0;
OemToCharA(pBuffer, dBuffer);
CallBack(dBuffer);
until (dRead < CReadBuffer);
Application.ProcessMessages;
until (dRunning <> WAIT_TIMEOUT);
finally
CloseHandle(piProcess.hProcess);
CloseHandle(piProcess.hThread);
end;
finally
CloseHandle(hRead);
CloseHandle(hWrite);
end;
end;