当使用管道从生成的进程中读取时,是否可以在请求输入时终止所述程序?
如果它没有终止,通常的ReadFile循环直到管道关闭将永远阻塞:
tsi.cb := SizeOf(TStartupInfo);
tsi.dwFlags := STARTF_USESTDHANDLES or STARTF_USESHOWWINDOW;
tsi.hStdInput := hInputRead;
tsi.hStdOutput := hOutputWrite;
tsi.hStdError := hErrorWrite;
if not CreateProcess(nil, PAnsiChar(Cmd), @sa, @sa, true, 0, nil, PAnsiChar(WorkDir), tsi, tpi) then
exit;
// Close handles we don't need. We are only interested in its output
CloseHandle(hOutputWrite);
CloseHandle(hInputRead);
CloseHandle(hErrorWrite);
repeat
// ReadFile will never return while our programs waits for input
if not ReadFile(OutputRead, Buf, SizeOf(Buf), nRead, nil) or (nRead = 0) then
begin
if GetLastError = ERROR_BROKEN_PIPE then
Break
else
ErrFunc('Pipe read error, could not execute file');
end;
// do something with buf...
until False;
单独终止非常容易(只使用TerminateProcess),但是只知道何时调用TerminateProcess太晚,即它挂起时。